- Link Authority: 66/100 (very strong, high confidence).
- Web graph rank: #539 of 134,979,706 domains, the top 0.001% of all domains.
- 150,690 linking domains counted in MrKeyword data.
- 363 hostnames under epa.gov in the web graph.
- 11th of 20 government and international bodies on MrKeyword's list.
What is epa.gov's domain authority?
epa.gov has a MrKeyword Link Authority of 66/100, a very strong score. The score comes from where epa.gov sits in MrKeyword's web graph (August–October 2026): it is #539 of 134,979,706 domains by PageRank, and Link Authority places that position on a 0–100 log curve, so the strongest domain scores 100.
This is MrKeyword's own metric, not Moz DA or Ahrefs DR (how the domain authority scores differ); how Link Authority is calculated gives both formulas.
How many websites link to epa.gov?
150,690 different domains link to epa.gov in MrKeyword's data, counting each linking website once however many links it has. That is the number SEO tools call referring domains. The web graph also lists 363 hostnames under epa.gov (subdomains such as www or blog count separately).
To see individual linking websites and anchor text, open the free backlink checker for epa.gov.
Which strong websites link to epa.gov?
The strongest linking domain MrKeyword's web graph shows for epa.gov is github.com, with a Link Authority of 86. The table lists the 10 strongest by their own score.
Strongest domains linking to epa.gov
| Linking domain | Link Authority | Web graph rank |
|---|---|---|
| github.com | 86 | #15 |
| apple.com | 84 | #20 |
| shopify.com | 83 | #24 |
| microsoft.com | 82 | #28 |
| wikipedia.org | 81 | #36 |
| tiktok.com | 81 | #37 |
| adobe.com | 80 | #41 |
| yandex.ru | 80 | #43 |
| fb.com | 80 | #44 |
| amazon.com | 79 | #48 |
9 of the 10 strongest linking domains have a profile on MrKeyword's list too (github.com, apple.com, shopify.com, microsoft.com, wikipedia.org, tiktok.com, adobe.com, yandex.ru, amazon.com). None of them is in epa.gov's own group, government and international bodies.
How does epa.gov compare with similar websites?
epa.gov is 11th of 20 government and international bodies on MrKeyword's list by Link Authority, with 2 neighbours above it in the table below. The median Link Authority of those 20 government and international bodies is 67, so epa.gov is 1 point below it.
epa.gov and its nearest peers
| Website | Link Authority | Web graph rank | Linking domains |
|---|---|---|---|
| nasa.gov | 67 | #511 | 135,422 |
| canada.ca | 67 | #519 | 116,009 |
| epa.gov | 66 | #539 | 150,690 |
| whitehouse.gov | 66 | #547 | 105,641 |
| worldbank.org | 66 | #558 | 94,468 |
See every profiled site on the domain authority list of popular websites, or compare your own site with any of these in the free domain authority checker.
What does a Link Authority of 66 mean?
A Link Authority of 66 is very strong: far ahead of almost every other website. Domains at this level are linked from a very wide spread of other sites; gaining more points usually takes links from other very strong domains. In plain numbers, epa.gov is in the top 0.001% of the 134,979,706 domains in the web graph.
To raise your own site's score, read how to increase domain authority; for the domains at the very top, see the most-linked websites of 2026. The authority list explains why the 0–100 scale is logarithmic.
Where does epa.gov's data come from?
Every number on epa.gov's profile is read from MrKeyword's web graph (August–October 2026). This version uses data imported on 31 October 2026. How MrKeyword collects and labels this data.