Skip to content
https://epa.gov

Performance

· 15 checks — Lighthouse + waterfall + sustainability rolled into one auditable list.
SCORE
77
GRADE
C
FIX
4
REVIEW
3
PASS
6
INFO
2

Performance-focused optimization plan with CWV assessment, top offenders, and time estimates

83
Performance Overall performance score (0–100) based on Core Web Vitals and other metrics. 90+ is good.
100
Accessibility Measures how accessible the page is for users with disabilities. Checks color contrast, ARIA labels, and semantic HTML.
96
Best Practices Checks for modern web development best practices including HTTPS, no console errors, and secure JavaScript.
100
SEO Measures basic SEO optimizations: meta tags, crawlability, link text, and mobile friendliness.

First Contentful Paint First Contentful Paint — how long until the browser renders the first piece of content. Under 1.8s is good.

1.01 s

Largest Contentful Paint Largest Contentful Paint — how long until the largest visible element loads. Under 2.5s is good.

2.44 s

Total Blocking Time Total Blocking Time — total time the main thread was blocked, preventing user input. Under 200ms is good.

18 ms

Cumulative Layout Shift Cumulative Layout Shift — measures visual stability. How much the page layout shifts during loading. Under 0.1 is good.

0.000

Speed Index Speed Index — how quickly content is visually displayed during load. Under 3.4s is good.

1.73 s

Time to Interactive Time to Interactive — how long until the page is fully interactive and responds to user input. Under 3.8s is good.

2.85 s

Page Load Progression

375 ms
750 ms
1.1 s
1.5 s
1.9 s
2.2 s
2.6 s
3.0 s
Checks
15
6 PASS 3 REVIEW 4 FIX
D
Page Weight Budget
Action
2.3 MB transferred, 97 requests
FIX
2.3 MB transferred, 97 requests
Info::
Page weighs 5.0 MB (2.3 MB transferred)
Warning::
Images are 1.2 MB — compress or use modern formats
Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.
Got: 1.2 MB
Warning::
JavaScript is 874 KB — consider code splitting or lazy loading
Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.
Got: 874 KB
Info::
97 HTTP requests
Info::
Estimated 0.48 g CO2 per page load
2.3 MB / 2.4 MB budget
2.3 MB transferred
97 requests
0.48 g CO2 per page load
Images 1.2 MiB 52%
JavaScript 874.5 KiB 37%
CSS 101.7 KiB 4%
Fonts 99.9 KiB 4%
Other 32.9 KiB 1%
HTML 15.7 KiB 1%
Other 4.0 KiB 0%
Other 595 B 0%
0 2.4 MB 4.9 MB
Approaching limit

Convert images to WebP/AVIF and resize to display dimensions to reduce transfer size.

Why this matters

Image bandwidth is high — modern formats (WebP/AVIF) and resizing typically cut it 50%+.

Source: web.dev

Large JavaScript bundles delay interactivity. Split code by route or defer non-critical scripts.

Why this matters

JavaScript bundle is large — code-split routes and lazy-load off-screen components to defer.

Source: web.dev

D
Third-Party Impact
Action
100% third-party, 0 ms blocking
FIX
100% third-party, 0 ms blocking
Warning::
Third-party code accounts for 100% of page weight (2.3 MiB of 2.3 MiB)
Info::
Third-party blocking time is low (0 ms)
100%
First-party Third-party
D
Page Weight Inventory
Action
97 resources · 2.3 MB · 287 KB savings available
FIX
97 resources · 2.3 MB · 287 KB savings available
Warning::
Page weight 1.3 MB over 1MB target
Got: 2.3 MB Expected: ≤ 1 MB
Info::
~287 KB of savings available
Warning::
96 third-party resources (100% of weight)
Info::
3 resources over 200KB
97 resources · 2.3 MiB · 96 third-party 1.3 MiB over 1MB target
Image 53% · 1.2 MiB
JavaScript 37% · 874.5 KiB
CSS 4% · 101.7 KiB
Font 4% · 99.9 KiB
Document 1% · 18.3 KiB
Other 0% · 2.2 KiB

~286.9 KiB of savings available

Remove unused JavaScript: 286.9 KiB
F
HTTP Caching
Action
No cache headers
FIX
No cache headers
Warning::
No Cache-Control header found
Browsers will use heuristic caching, which can be unpredictable. Set explicit cache headers.

No Cache-Control header

Adding a Cache-Control header can significantly improve repeat-visit performance.

C
Image Optimization
Action
17 images, 0 KB saveable
REVIEW
17 images, 0 KB saveable
Warning::
https://touchpoints.app.cloud.gov/img/us_flag_smal... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
Warning::
https://cg-1b082c1b-3db7-477f-9ca5-bd51a786b41e.s3... is missing width/height — may cause layout shift
Set explicit width and height to prevent CLS.
17 images 1.2 MB
0 oversized -0 KB
17 legacy format
2 missing dimensions CLS risk

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

Set explicit width and height to prevent CLS.

Why this matters

Image without explicit width/height — browser can't reserve space; CLS jumps when image loads.

Source: web.dev / Core Web Vitals

C
JS Bundles
Action
38 scripts, 287 KB unused
REVIEW
38 scripts, 287 KB unused
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 106 KB unused (72%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 62 KB unused (42%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtag/js?id=G-2SEC...: 61 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Warning::
https://www.googletagmanager.com/gtm.js?id=GTM-L8Z...: 58 KB unused (39%)
Consider code splitting or tree shaking to reduce unused code.
Info::
Total unused JavaScript: 287 KB
287 KB unused JavaScript

Downloaded but never executed on this page.

ScriptSizeUnusedMinifiedParty
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L147 KB106 KB (72%)3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1147 KB62 KB (42%)3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1156 KB61 KB (39%)3rd
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB147 KB58 KB (39%)3rd
https://www.epa.gov/themes/epa_theme/js/dist/sitewide-alert.min.js?v=202512112 KB3rd
https://www.epa.gov/themes/epa_theme/js/dist/external-links.min.js?v=202512113 KB3rd
https://www.epa.gov/modules/custom/epa_wysiwyg/js/plugins/epaNew/epaNew.js?tc8i6t2 KB3rd
https://www.epa.gov/core/misc/progress.js?v=10.3.142 KB3rd
https://www.epa.gov/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.02 KB3rd
https://www.epa.gov/core/misc/debounce.js?v=10.3.141 KB3rd

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

Consider code splitting or tree shaking to reduce unused code.

Why this matters

This bundle has high unused code — code-split or tree-shake to ship only what executes.

Source: web.dev / Lighthouse coverage

C
Green Hosting
Action
Whether the site is served from green-energy infrastructure
REVIEW

Green Hosting

No green hosting detected

A+
Text Compression
All text resources are compressed
PASS
All text resources are compressed
Info::
All text resources are compressed
All text resources are properly compressed.
A+
JS Execution Cost
445ms total JS execution
PASS
445ms total JS execution
Info::
https://www.epa.gov/: 118ms CPU time
Info::
Unattributable: 114ms CPU time
Info::
https://www.googletagmanager.com/gtm.js?id=GTM-L8Z...: 88ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-2SEC...: 65ms CPU time
Info::
https://www.googletagmanager.com/gtag/js?id=G-CSLL...: 60ms CPU time
Warning::
Third-party scripts: 445ms (100% of total)

Main Thread Breakdown

Script Evaluation 44% Other 28% Style & Layout 11% Script Parsing & Compilation 10% Parse HTML & CSS 4%
ScriptTotalScriptingParse/CompileParty
https://www.epa.gov/118ms4ms1ms3rd
Unattributable114ms2ms0ms3rd
https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB88ms75ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h165ms53ms12ms3rd
https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h160ms52ms7ms3rd
A+
Font Loading
5 fonts (100 KB)
PASS
5 fonts (100 KB)
Info::
5 font(s) use font-display: swap (FOUT risk but functional)

Web fonts

5

100 KB total

Render-blocking

0

of 5

Dominant font-display

swap

Most common across fonts

Font loading timeline
Transfer FOIT (block) FOUT (swap)
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.4 shttps://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2sourcesanspro-regular-w... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 20.5 KiB — 66 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2sourcesanspro-bold-webf... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 20.3 KiB — 70 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2sourcesanspro-italic-we... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2 — 16.4 KiB — 74 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2Latin-Merriweather-Bold... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 21.2 KiB — 72 ms — font-display: swaphttps://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Regular.woff2Latin-Merriweather-Regu... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 21.6 KiB — 70 ms — font-display: swap
sourcesanspro-regular-w... woff2 swap
Size 20 KB
Load time 66 ms
Start 569 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-bold-webf... woff2 swap
Size 20 KB
Load time 70 ms
Start 570 ms
Risk FOUT — text flashes from fallback to web font
sourcesanspro-italic-we... woff2 swap
Size 16 KB
Load time 74 ms
Start 570 ms
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Bold... woff2 swap
Size 21 KB
Load time 72 ms
Start 570 ms
Risk FOUT — text flashes from fallback to web font
Latin-Merriweather-Regu... woff2 swap
Size 22 KB
Load time 70 ms
Start 726 ms
Risk FOUT — text flashes from fallback to web font
Optimization checklist
  • Preload critical fonts (priority=high)
  • Use woff2 format for all fonts
  • Set font-display to swap, optional, or fallback
  • Subset large fonts (≤100 KB each)
A+
Resource Caching
All resources properly cached
PASS
All resources properly cached
Info::
No caching issues found
All static resources have appropriate caching headers.
A+
Critical Rendering Path
No render-blocking resources
PASS
No render-blocking resources
Info::
No render-blocking resources detected
A+
Resource Hints
No optimization needed
PASS
No optimization needed
Info::
No resource hint issues
Network Waterfall
97 requests over 2606ms
INFO
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.4 shttps://epa.gov// https://epa.gov/ — 301 — 320 B — 492 ms — http/1.1https://www.epa.gov/www.epa.gov/ https://www.epa.gov/ — 200 — 15.7 KiB — 67 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 200 — 20.5 KiB — 66 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 200 — 20.3 KiB — 70 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2 — 200 — 16.4 KiB — 74 ms — h2https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 200 — 21.2 KiB — 72 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/align.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/align.module.css?tc8i6t — 200 — 1.2 KiB — 33 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?tc8i6t — 200 — 880 B — 34 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/container-inline.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/container-inline.module.css?tc8i6t — 200 — 1008 B — 40 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/clearfix.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/clearfix.module.css?tc8i6t — 200 — 1.1 KiB — 34 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/details.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/details.module.css?tc8i6t — 200 — 890 B — 35 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/hidden.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/hidden.module.css?tc8i6t — 200 — 1.3 KiB — 36 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/item-list.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/item-list.module.css?tc8i6t — 200 — 1.0 KiB — 37 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/js.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/js.module.css?tc8i6t — 200 — 1.2 KiB — 35 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/nowrap.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/nowrap.module.css?tc8i6t — 200 — 881 B — 39 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/position-container.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/position-container.module.css?tc8i6t — 200 — 880 B — 44 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?tc8i6t — 200 — 1.0 KiB — 40 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/resize.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/resize.module.css?tc8i6t — 200 — 1.0 KiB — 42 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-counter.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-counter.css?tc8i6t — 200 — 1.5 KiB — 38 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?tc8i6t — 200 — 1.3 KiB — 45 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?tc8i6t — 200 — 1.0 KiB — 41 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/tablesort.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/tablesort.module.css?tc8i6t — 200 — 1.1 KiB — 40 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/progress.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/progress.module.css?tc8i6t — 200 — 1.6 KiB — 47 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/ajax-progress.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/ajax-progress.module.css?tc8i6t — 200 — 1.2 KiB — 47 ms — h2https://www.epa.gov/themes/contrib/stable/css/views/views.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/views/views.module.css?tc8i6t — 200 — 1.2 KiB — 45 ms — h2https://www.epa.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tc8i6twww.epa.gov/modules/contrib/paragra... https://www.epa.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tc8i6t — 200 — 842 B — 49 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-arabic.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-arabic.css?tc8i6t — 200 — 1.1 KiB — 47 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-kr.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-kr.css?tc8i6t — 200 — 1.2 KiB — 51 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-bn.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-bn.css?tc8i6t — 200 — 1.2 KiB — 48 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-gu.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-gu.css?tc8i6t — 200 — 1.2 KiB — 50 ms — h2
0 ms 500 ms 1.0 s 1.5 s 2.0 s 2.5 s FCP 1.0 s LCP 2.4 shttps://epa.gov// https://epa.gov/ — 301 — 320 B — 492 ms — http/1.1https://www.epa.gov/www.epa.gov/ https://www.epa.gov/ — 200 — 15.7 KiB — 67 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-regular-webfont.woff2 — 200 — 20.5 KiB — 66 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-bold-webfont.woff2 — 200 — 20.3 KiB — 70 ms — h2https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/source-sans-pro/sourcesanspro-italic-webfont.woff2 — 200 — 16.4 KiB — 74 ms — h2https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Bold.woff2 — 200 — 21.2 KiB — 72 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/align.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/align.module.css?tc8i6t — 200 — 1.2 KiB — 33 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/fieldgroup.module.css?tc8i6t — 200 — 880 B — 34 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/container-inline.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/container-inline.module.css?tc8i6t — 200 — 1008 B — 40 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/clearfix.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/clearfix.module.css?tc8i6t — 200 — 1.1 KiB — 34 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/details.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/details.module.css?tc8i6t — 200 — 890 B — 35 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/hidden.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/hidden.module.css?tc8i6t — 200 — 1.3 KiB — 36 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/item-list.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/item-list.module.css?tc8i6t — 200 — 1.0 KiB — 37 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/js.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/js.module.css?tc8i6t — 200 — 1.2 KiB — 35 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/nowrap.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/nowrap.module.css?tc8i6t — 200 — 881 B — 39 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/position-container.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/position-container.module.css?tc8i6t — 200 — 880 B — 44 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/reset-appearance.module.css?tc8i6t — 200 — 1.0 KiB — 40 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/resize.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/resize.module.css?tc8i6t — 200 — 1.0 KiB — 42 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-counter.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-counter.css?tc8i6t — 200 — 1.5 KiB — 38 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-counters.css?tc8i6t — 200 — 1.3 KiB — 45 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/system-status-report-general-info.css?tc8i6t — 200 — 1.0 KiB — 41 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/tablesort.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/tablesort.module.css?tc8i6t — 200 — 1.1 KiB — 40 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/progress.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/progress.module.css?tc8i6t — 200 — 1.6 KiB — 47 ms — h2https://www.epa.gov/themes/contrib/stable/css/system/components/ajax-progress.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/system/components/ajax-progress.module.css?tc8i6t — 200 — 1.2 KiB — 47 ms — h2https://www.epa.gov/themes/contrib/stable/css/views/views.module.css?tc8i6twww.epa.gov/themes/contrib/stable/c... https://www.epa.gov/themes/contrib/stable/css/views/views.module.css?tc8i6t — 200 — 1.2 KiB — 45 ms — h2https://www.epa.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tc8i6twww.epa.gov/modules/contrib/paragra... https://www.epa.gov/modules/contrib/paragraphs/css/paragraphs.unpublished.css?tc8i6t — 200 — 842 B — 49 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-arabic.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-arabic.css?tc8i6t — 200 — 1.1 KiB — 47 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-kr.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-kr.css?tc8i6t — 200 — 1.2 KiB — 51 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-bn.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-bn.css?tc8i6t — 200 — 1.2 KiB — 48 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-gu.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-gu.css?tc8i6t — 200 — 1.2 KiB — 50 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-sc.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-sc.css?tc8i6t — 200 — 1.2 KiB — 53 ms — h2https://www.epa.gov/themes/epa_theme/fonts/noto-sans-tc.css?tc8i6twww.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/noto-sans-tc.css?tc8i6t — 200 — 1017 B — 51 ms — h2https://www.epa.gov/themes/epa_theme/css/styles.css?tc8i6twww.epa.gov/themes/epa_theme/css/st... https://www.epa.gov/themes/epa_theme/css/styles.css?tc8i6t — 200 — 71.4 KiB — 75 ms — h2https://www.epa.gov/themes/epa_theme/css-lib/colorbox.min.css?tc8i6twww.epa.gov/themes/epa_theme/css-li... https://www.epa.gov/themes/epa_theme/css-lib/colorbox.min.css?tc8i6t — 200 — 1.3 KiB — 54 ms — h2https://www.epa.gov/themes/epa_theme/images/icon-dot-gov.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/icon-dot-gov.svg — 200 — 1.2 KiB — 56 ms — h2https://www.epa.gov/themes/epa_theme/images/icon-https.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/icon-https.svg — 200 — 1.1 KiB — 60 ms — h2https://www.epa.gov/sites/default/files/styles/gallery_medium/public/2020-10/scientists.png?h=febd24ec&itok=C60r6v1Gwww.epa.gov/sites/default/files/sty... https://www.epa.gov/sites/default/files/styles/gallery_medium/public/2020-10/scientists.png?h=febd24ec&itok=C60r6v1G — 200 — 178.8 KiB — 40 ms — h2https://www.epa.gov/system/files/styles/gallery_medium/private/images/2023-03/scott-graham-5fNmWej4tAA-unsplash.jpg?h=51a72048&itok=PQuMtvNRwww.epa.gov/system/files/styles/gal... https://www.epa.gov/system/files/styles/gallery_medium/private/images/2023-03/scott-graham-5fNmWej4tAA-unsplash.jpg?h=51a72048&itok=PQuMtvNR — 200 — 40.3 KiB — 36 ms — h2https://www.epa.gov/sites/default/files/styles/gallery_medium/public/2020-02/epa-banner-images/istock-1002010762_731by350.jpg?h=d305814d&itok=M8Ww0uSEwww.epa.gov/sites/default/files/sty... https://www.epa.gov/sites/default/files/styles/gallery_medium/public/2020-02/epa-banner-images/istock-1002010762_731by350.jpg?h=d305814d&itok=M8Ww0uSE — 200 — 36.5 KiB — 39 ms — h2https://www.epa.gov/core/assets/vendor/jquery/jquery.min.js?v=3.7.1www.epa.gov/core/assets/vendor/jque... https://www.epa.gov/core/assets/vendor/jquery/jquery.min.js?v=3.7.1 — 200 — 30.5 KiB — 46 ms — h2https://www.epa.gov/core/assets/vendor/once/once.min.js?v=1.0.1www.epa.gov/core/assets/vendor/once... https://www.epa.gov/core/assets/vendor/once/once.min.js?v=1.0.1 — 200 — 1.4 KiB — 39 ms — h2https://www.epa.gov/core/misc/drupalSettingsLoader.js?v=10.3.14www.epa.gov/core/misc/drupalSetting... https://www.epa.gov/core/misc/drupalSettingsLoader.js?v=10.3.14 — 200 — 1.5 KiB — 41 ms — h2https://www.epa.gov/core/misc/drupal.js?v=10.3.14www.epa.gov/core/misc/drupal.js?v=1... https://www.epa.gov/core/misc/drupal.js?v=10.3.14 — 200 — 6.9 KiB — 71 ms — h2https://www.epa.gov/core/misc/drupal.init.js?v=10.3.14www.epa.gov/core/misc/drupal.init.j... https://www.epa.gov/core/misc/drupal.init.js?v=10.3.14 — 200 — 1.7 KiB — 45 ms — h2https://www.epa.gov/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0www.epa.gov/core/assets/vendor/tabb... https://www.epa.gov/core/assets/vendor/tabbable/index.umd.min.js?v=6.2.0 — 200 — 3.2 KiB — 42 ms — h2https://www.epa.gov/modules/custom/epa_wysiwyg/js/plugins/epaNew/epaNew.js?tc8i6twww.epa.gov/modules/custom/epa_wysi... https://www.epa.gov/modules/custom/epa_wysiwyg/js/plugins/epaNew/epaNew.js?tc8i6t — 200 — 1.7 KiB — 46 ms — h2https://www.epa.gov/core/misc/progress.js?v=10.3.14www.epa.gov/core/misc/progress.js?v... https://www.epa.gov/core/misc/progress.js?v=10.3.14 — 200 — 2.5 KiB — 43 ms — h2https://www.epa.gov/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0www.epa.gov/core/assets/vendor/load... https://www.epa.gov/core/assets/vendor/loadjs/loadjs.min.js?v=4.3.0 — 200 — 1.7 KiB — 47 ms — h2https://www.epa.gov/core/misc/debounce.js?v=10.3.14www.epa.gov/core/misc/debounce.js?v... https://www.epa.gov/core/misc/debounce.js?v=10.3.14 — 200 — 1.5 KiB — 60 ms — h2https://www.epa.gov/core/misc/announce.js?v=10.3.14www.epa.gov/core/misc/announce.js?v... https://www.epa.gov/core/misc/announce.js?v=10.3.14 — 200 — 2.5 KiB — 50 ms — h2https://www.epa.gov/core/misc/message.js?v=10.3.14www.epa.gov/core/misc/message.js?v=... https://www.epa.gov/core/misc/message.js?v=10.3.14 — 200 — 3.2 KiB — 51 ms — h2https://www.epa.gov/core/misc/ajax.js?v=10.3.14www.epa.gov/core/misc/ajax.js?v=10.... https://www.epa.gov/core/misc/ajax.js?v=10.3.14 — 200 — 17.4 KiB — 55 ms — h2https://www.epa.gov/themes/contrib/stable/js/ajax.js?v=10.3.14www.epa.gov/themes/contrib/stable/j... https://www.epa.gov/themes/contrib/stable/js/ajax.js?v=10.3.14 — 200 — 1.1 KiB — 52 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/common.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/common.min.js?v=20251211 — 200 — 22.0 KiB — 56 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/scripts.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/scripts.min.js?v=20251211 — 200 — 28.8 KiB — 90 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/header-search.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/header-search.min.js?v=20251211 — 200 — 2.0 KiB — 60 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/epa-alerts.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/epa-alerts.min.js?v=20251211 — 200 — 2.3 KiB — 65 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/sitewide-alert.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/sitewide-alert.min.js?v=20251211 — 200 — 2.0 KiB — 70 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/private-sitewide-alert.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/private-sitewide-alert.min.js?v=20251211 — 200 — 4.5 KiB — 73 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/definition.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/definition.min.js?v=20251211 — 200 — 1.9 KiB — 75 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/external-links.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/external-links.min.js?v=20251211 — 200 — 3.1 KiB — 76 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/protected-links.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/protected-links.min.js?v=20251211 — 200 — 2.0 KiB — 77 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/vid-copy.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/vid-copy.min.js?v=20251211 — 200 — 1.8 KiB — 79 ms — h2https://www.epa.gov/core/misc/jquery.form.js?v=4.3.0www.epa.gov/core/misc/jquery.form.j... https://www.epa.gov/core/misc/jquery.form.js?v=4.3.0 — 200 — 13.8 KiB — 90 ms — h2https://www.epa.gov/core/modules/views/js/base.js?v=10.3.14www.epa.gov/core/modules/views/js/b... https://www.epa.gov/core/modules/views/js/base.js?v=10.3.14 — 200 — 1.9 KiB — 82 ms — h2https://www.epa.gov/core/modules/views/js/ajax_view.js?v=10.3.14www.epa.gov/core/modules/views/js/a... https://www.epa.gov/core/modules/views/js/ajax_view.js?v=10.3.14 — 200 — 3.1 KiB — 84 ms — h2https://www.epa.gov/themes/epa_theme/js/dist/hero-slideshow.min.js?v=20251211www.epa.gov/themes/epa_theme/js/dis... https://www.epa.gov/themes/epa_theme/js/dist/hero-slideshow.min.js?v=20251211 — 200 — 2.0 KiB — 99 ms — h2https://www.epa.gov/sites/all/libraries/cycle/jquery.cycle.all.jswww.epa.gov/sites/all/libraries/cyc... https://www.epa.gov/sites/all/libraries/cycle/jquery.cycle.all.js — 200 — 13.6 KiB — 94 ms — h2https://www.epa.gov/themes/epa_theme/images/us_flag_small.pngwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/us_flag_small.png — 200 — 1003 B — 91 ms — h2https://www.epa.gov/themes/epa_theme/images/epa-seal.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/epa-seal.svg — 200 — 4.9 KiB — 95 ms — h2https://touchpoints.app.cloud.gov/touchpoints/f276bd95.jstouchpoints.app.cloud.gov/touchpoin... https://touchpoints.app.cloud.gov/touchpoints/f276bd95.js — 200 — 79.8 KiB — 1.1 s — h2https://www.googletagmanager.com/gtm.js?id=GTM-L8ZBwww.googletagmanager.com/gtm.js?id=... https://www.googletagmanager.com/gtm.js?id=GTM-L8ZB — 200 — 147.4 KiB — 200 ms — h2https://www.epa.gov/themes/epa_theme/images/sprite.artifact.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/sprite.artifact.svg — 200 — 4.2 KiB — 98 ms — h2https://www.epa.gov/themes/epa_theme/images/usa-icons/expand_more.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/usa-icons/expand_more.svg — 200 — 561 B — 95 ms — h2https://www.epa.gov/themes/epa_theme/images/external-link--blue-base.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/external-link--blue-base.svg — 200 — 603 B — 93 ms — h2https://www.epa.gov/system/files/styles/hero/private/2026-04/microplastics_banner.jpg?h=0d8074f4&itok=6IxeqB0mwww.epa.gov/system/files/styles/her... https://www.epa.gov/system/files/styles/hero/private/2026-04/microplastics_banner.jpg?h=0d8074f4&itok=6IxeqB0m — 200 — 357.7 KiB — 100 ms — h2https://www.epa.gov/system/files/styles/hero/private/2026-01/500accomplishments.jpg?h=189546f5&itok=S_BUCREdwww.epa.gov/system/files/styles/her... https://www.epa.gov/system/files/styles/hero/private/2026-01/500accomplishments.jpg?h=189546f5&itok=S_BUCREd — 200 — 226.2 KiB — 103 ms — h2https://www.epa.gov/system/files/styles/hero/private/2025-07/20250724_usa-mexico-tijuana-river-mou_hero.jpg?h=35d2ff27&itok=ST2NOyxZwww.epa.gov/system/files/styles/her... https://www.epa.gov/system/files/styles/hero/private/2025-07/20250724_usa-mexico-tijuana-river-mou_hero.jpg?h=35d2ff27&itok=ST2NOyxZ — 200 — 144.7 KiB — 104 ms — h2https://www.epa.gov/system/files/styles/hero/private/2025-02/greatamericancomeback_banner.jpg?h=35d2ff27&itok=-bdNh1Jewww.epa.gov/system/files/styles/her... https://www.epa.gov/system/files/styles/hero/private/2025-02/greatamericancomeback_banner.jpg?h=35d2ff27&itok=-bdNh1Je — 200 — 217.0 KiB — 108 ms — h2https://www.epa.gov/themes/epa_theme/images/external-link--gray-2.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/external-link--gray-2.svg — 200 — 604 B — 104 ms — h2https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Regular.woff2www.epa.gov/themes/epa_theme/fonts/... https://www.epa.gov/themes/epa_theme/fonts/merriweather/Latin-Merriweather-Regular.woff2 — 200 — 21.6 KiB — 70 ms — h2https://www.epa.gov/views/ajax?_wrapper_format=drupal_ajaxwww.epa.gov/views/ajax?_wrapper_for... https://www.epa.gov/views/ajax?_wrapper_format=drupal_ajax — 200 — 1.6 KiB — 470 ms — h2https://www.epa.gov/themes/epa_theme/images/sprite.svgwww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/sprite.svg — 200 — 22.2 KiB — 24 ms — h2https://www.epa.gov/newsreleases/search/rss/news_releases_language/en/press_office/headquarters-226129www.epa.gov/newsreleases/search/rss... https://www.epa.gov/newsreleases/search/rss/news_releases_language/en/press_office/headquarters-226129 — 405 — 2.4 KiB — 19 ms — h2https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-2SEC4V3SK9&cx=c&gtm=4e64h1 — 200 — 156.1 KiB — 46 ms — h2https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=EPAdap.digitalgov.gov/Universal-Federa... https://dap.digitalgov.gov/Universal-Federated-Analytics-Min.js?agency=EPA — 200 — 9.4 KiB — 49 ms — h3https://script.crazyegg.com/pages/scripts/0005/9240.jsscript.crazyegg.com/pages/scripts/0... https://script.crazyegg.com/pages/scripts/0005/9240.js — 200 — 229 B — 50 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-2SEC4V3SK9&gtm=45je64h1v878556849z8542870za20gzb542870zd542870&_p=1776796897679&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1113575849.1776796898&frm=0&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~118463262&sid=1776796898&sct=1&seg=0&dl=https%3A%2F%2Fwww.epa.gov%2F&dt=U.S.%20Environmental%20Protection%20Agency%20%7C%20US%20EPA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.dc_language=en&ep.debug_mode=true&ep.visitor_id=one%20and%20done%20visitor&ep.microsite=not-assigned&ep.resource_directory=not-assigned&ep.page_node_id=not-assigned&ep.tracking_script_version=EPA%203.0%20160101%20-%20GTM%20version%20320&ep.tracking_script_name=GTM-L8ZB&ep.page_type=not-assigned&ep.dc_date_reviewed=2026-07-02&ep.dc_date_created=2013-03-20&ep.dc_creator_publisher=US%20EPA%2COA&ep.webarea_navigation_type=sidebar_navigation&ep.web_area=U.S.%20Environmental%20Protection%20Agency&ep.content_type=Web%20Area%20Homepage&tfd=1069region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-2SEC4V3SK9&gtm=45je64h1v878556849z8542870za20gzb542870zd542870&_p=1776796897679&gcd=13l3l3l2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1113575849.1776796898&frm=0&pscdl=noapi&rcb=4&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938469~117266401~118463262&sid=1776796898&sct=1&seg=0&dl=https%3A%2F%2Fwww.epa.gov%2F&dt=U.S.%20Environmental%20Protection%20Agency%20%7C%20US%20EPA&en=page_view&_fv=1&_nsi=1&_ss=1&ep.dc_language=en&ep.debug_mode=true&ep.visitor_id=one%20and%20done%20visitor&ep.microsite=not-assigned&ep.resource_directory=not-assigned&ep.page_node_id=not-assigned&ep.tracking_script_version=EPA%203.0%20160101%20-%20GTM%20version%20320&ep.tracking_script_name=GTM-L8ZB&ep.page_type=not-assigned&ep.dc_date_reviewed=2026-07-02&ep.dc_date_created=2013-03-20&ep.dc_creator_publisher=US%20EPA%2COA&ep.webarea_navigation_type=sidebar_navigation&ep.web_area=U.S.%20Environmental%20Protection%20Agency&ep.content_type=Web%20Area%20Homepage&tfd=1069 — 204 — 547 B — 90 ms — h2https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.jsdap.digitalgov.gov/web-vitals/dist/... https://dap.digitalgov.gov/web-vitals/dist/web-vitals.attribution.iife.js — 200 — 4.5 KiB — 21 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4Lwww.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L — 200 — 147.1 KiB — 97 ms — h3https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1www.googletagmanager.com/gtag/js?id... https://www.googletagmanager.com/gtag/js?id=G-CSLL4ZEK4L&cx=c&gtm=4e64h1 — 200 — 147.1 KiB — 93 ms — h3https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb542870zd542870&_p=1776796897679&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1113575849.1776796898&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266400~117884344~118128922&dl=https%3A%2F%2Fepa.gov%2F&dt=U.S.%20Environmental%20Protection%20Agency%20%7C%20US%20EPA&dr=&sid=1776796898&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=EPA&ep.subagency=EPA.GOV&ep.site_topic=unspecified%3Aepa.gov&ep.site_platform=unspecified%3Aepa.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=epa.gov&tfd=1236region1.google-analytics.com/g/coll... https://region1.google-analytics.com/g/collect?v=2&tid=G-CSLL4ZEK4L&gtm=45je64h1v9131934939za200zb542870zd542870&_p=1776796897679&gcd=13l3lPl2l1l1&npa=1&dma_cps=a&dma=1&are=1&cid=1113575849.1776796898&frm=0&pscdl=noapi&rcb=3&sr=800x600&uaa=x86&uab=64&uafvl=Chromium%3B147.0.7727.101%7CNot.A%252FBrand%3B8.0.0.0&uam=&uamb=0&uap=macOS&uapv=10.15.7&uaw=0&ul=en-us&_s=1&tag_exp=0~115938465~115938468~117266400~117884344~118128922&dl=https%3A%2F%2Fepa.gov%2F&dt=U.S.%20Environmental%20Protection%20Agency%20%7C%20US%20EPA&dr=&sid=1776796898&sct=1&seg=0&_tu=wA&en=page_view&_fv=1&_ss=1&_ee=1&ep.agency=EPA&ep.subagency=EPA.GOV&ep.site_topic=unspecified%3Aepa.gov&ep.site_platform=unspecified%3Aepa.gov&ep.script_source=https%3A%2F%2Fdap.digitalgov.gov%2Funiversal-federated-analytics-min.js&ep.version=20250702%20v8.7%20-%20ga4&ep.protocol=https%3A&ep.using_parallel_tracker=no&ep.hostname_dimension=epa.gov&tfd=1236 — 204 — 48 B — 26 ms — h2https://www.epa.gov/modules/contrib/views_ajax_get/views_ajax_get.js?tc8i6twww.epa.gov/modules/contrib/views_a... https://www.epa.gov/modules/contrib/views_ajax_get/views_ajax_get.js?tc8i6t — 200 — 1.3 KiB — 19 ms — h2https://touchpoints.app.cloud.gov/img/usa-icons/launch.svgtouchpoints.app.cloud.gov/img/usa-i... https://touchpoints.app.cloud.gov/img/usa-icons/launch.svg — 200 — 609 B — 709 ms — h2https://cg-1b082c1b-3db7-477f-9ca5-bd51a786b41e.s3-us-gov-west-1.amazonaws.com/uploads/form/logo/5810/logo_square_epa_logo2.JPGcg-1b082c1b-3db7-477f-9ca5-bd51a786... https://cg-1b082c1b-3db7-477f-9ca5-bd51a786b41e.s3-us-gov-west-1.amazonaws.com/uploads/form/logo/5810/logo_square_epa_logo2.JPG — 200 — 2.4 KiB — 570 ms — http/1.1https://touchpoints.app.cloud.gov/img/us_flag_small.pngtouchpoints.app.cloud.gov/img/us_fl... https://touchpoints.app.cloud.gov/img/us_flag_small.png — 200 — 516 B — 185 ms — h2https://www.epa.gov/themes/epa_theme/images/favicon.icowww.epa.gov/themes/epa_theme/images... https://www.epa.gov/themes/epa_theme/images/favicon.ico — 200 — 6.1 KiB — 21 ms — h2
HTML JavaScript CSS Images Fonts XHR/Fetch Other
Third-Party Script Cost
Per-script blocking time, transfer cost, and cache headers
INFO
100% of JavaScript execution is third-party
First-party Third-party 445ms · 466KB · $6/mo
www.epa.gov
Other
Optional
Execution 118ms
Transfer 16 KB
Monthly Cost $2/mo
Unattributable
Other
Optional
Execution 114ms
Transfer 0 KB
Monthly Cost $2/mo
Google Tag Manager
Tag Manager
Optional
Execution 88ms
Transfer 147 KB
Unused 39%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 65ms
Transfer 156 KB
Unused 39%
Monthly Cost $1/mo
Google Tag Manager
Tag Manager
Optional
Execution 60ms
Transfer 147 KB
Unused 42%
Monthly Cost $1/mo

100% of JavaScript execution time is spent on third-party scripts. Consider auditing which scripts are essential.

Why this matters

When third-party JS execution time exceeds your own, performance gains from frontend work are capped by code you don't own.

Learn more

Every millisecond of third-party JS competes with your own for main-thread time. If their share is bigger than yours, optimization on your code base barely moves the needle. Audit, defer, or remove third-parties before further frontend optimization. Use Lighthouse's third-party audit to identify the worst offenders.

Source: web.dev

How third-party costs are calculated

All checks on this page are automated. Results are estimates - run targeted manual reviews when the score affects a release decision.

Send Feedback