Skip to content
https://dc.gov

Sustainability

· 6 checks — CO2 emissions, green hosting, repeat-visit weight, carbon budget, and transfer efficiency rolled into one auditable list.
SCORE
94
GRADE
A
FIX
0
REVIEW
0
PASS
6
INFO
0
Device:
Mobile Desktop
Checks
6
6 PASS
A
CO2 Per Page Load
0.36g CO2 per view
PASS
0.36g CO2 per view
Info::
0.36g CO2 per page view
This page transfers 1.5 MB, producing an estimated 0.36g of CO2 per visit using the Sustainable Web Design model (v4). Breakdown: data center 0.01g, network 0.08g, end-user device 0.28g.
Got: 0.36g CO2 Expected: < 0.50g (sustainability target)
Info::
At 10,000 monthly views: 43.8 kg CO2/year
With 10,000 page views per month, this page would generate approximately 43.8 kg of CO2 annually — equivalent to charging 5471 smartphones.
Info::
Green hosting reduces data center emissions

0.36g

Carbon Footprint per page view

✓ Below sustainability target (0.50g)

Cleaner than 74% of websites

Sustainable Web Design model v4 · Page size: 1.5 MB

Your site
0.36g
Top 10%
0.20g
Target
0.50g
Median website
0.60g

Energy Breakdown

Data center
0.01g
Network
0.08g
End-user device
0.28g
At 10,000 monthly views: Monthly: 3.6 kg · Annual: 43.8 kg · ≈ 5471 smartphone charges
A+
Green Hosting
Green (both)
PASS
Green (both)
Info::
Both hosting and CDN use renewable energy
Got: Hosting: Acquia Cloud Platform, CDN: Cloudflare
Info::
Acquia Cloud Platform: Verified by the Green Web Foundation
Info::
Cloudflare: 100% renewable energy for global network since 2019
Info::
Green hosting status based on known provider commitments
Green hosting detection uses a curated database of provider renewable energy commitments. This is not a real-time verification. For authoritative checks, visit thegreenwebfoundation.org.
Green Hosting✓ Green Hosted
Hosting Acquia Cloud Platform✓CDN Cloudflare✓

Acquia Cloud Platform: Verified by the Green Web Foundation

Cloudflare: 100% renewable energy for global network since 2019

Based on known provider commitments. Verify at thegreenwebfoundation.org

A+
Repeat Visit Weight
91% cached
PASS
91% cached
Info::
91% reduction on repeat visits
Returning visitors download only 147 KB (vs 1578 KB first visit). 132 of 136 resources are served from browser cache, saving 0.33g CO2 per repeat visit.
Info::
Repeat visit: 0.03g CO2 (first visit: 0.36g)
First visit
1578 KB
Repeat visit
147 KB

91% reduction on repeat visits

Saving 0.33g CO2 per returning visitor

132 resources served from cache · 4 resources re-downloaded

A
Carbon Budget
26th percentile
PASS
26th percentile
Info::
0.36g CO2 — below the sustainability target of 0.50g
Cleaner than an estimated 74% of websites analyzed. This page meets the Web Sustainability Guidelines target.
Info::
Estimated 26th percentile
Compared to: top 10% = 0.20g, target = 0.50g, median = 0.60g per page view.
Top 10%
Target
Median website

0.36g

26th percentile

Cleaner than 74% of websites

✓ Below the Web Sustainability Guidelines target

vs Median 39% cleaner ✓
vs Target 27% cleaner ✓
A+
Transfer Efficiency
90% efficient
PASS
90% efficient
Info::
Transfer efficiency: 90%
Only 153 KB of potential savings identified. Your page is well-optimized for size.
90% efficient

Total waste: 153 KB (10% of page weight)

Unused JS 153 KB

0.04g unnecessary CO2 per visit

Actual transfer 1578 KB
Theoretical minimum 1424 KB
Potential savings 153 KB (0.04g CO2)

See Deep Analysis sections above for specific optimizations.

A+
Green Hosting
Whether the site is served from green-energy infrastructure
PASS

Green Hosting

This site is hosted on green energy infrastructure

Provider: Cloudflare

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

Send Feedback