Category
environment
Native level
County
Unit
index
Vintage
2026 Q1
States ranked by drinking water purity
51 states with data (2026 Q1). Top 10 highest and bottom 10 lowest.
| Rank | State | Value |
|---|---|---|
| 1 | North Dakota | 97 |
| 2 | Arkansas | 97 |
| 3 | Vermont | 97 |
| 4 | South Dakota | 96 |
| 5 | Hawaii | 96 |
| 6 | Iowa | 96 |
| 7 | Missouri | 95 |
| 8 | Nebraska | 95 |
| 9 | Kansas | 95 |
| 10 | Maine | 95 |
| Rank | State | Value |
|---|---|---|
| 51 | Arizona | 82 |
| 50 | New Jersey | 83 |
| 49 | Pennsylvania | 86 |
| 48 | Oklahoma | 86 |
| 47 | Florida | 88 |
| 46 | Alabama | 88 |
| 45 | Connecticut | 88 |
| 44 | Idaho | 88 |
| 43 | West Virginia | 89 |
| 42 | Alaska | 90 |
About this map
hearthmap renders drinking water purity as a choropleth map of the United States. Zoom in to see county values shaded against the rest of the country, and click any region to see its exact value with margin of error.
You can layer filters and a custom match score on top of drinking water purityto find places that match what matters to you. Combine it with school ratings, housing prices, commute times, and more.
Source: EPA SDWIS + UCMR3/4/5 · 2026 Q1