We analyzed tap water quality data for hundreds of cities across the United States to identify the 10 with the cleanest drinking water. This ranking is based on 2026 data from the EPA and EWG databases.
These cities stand out for having the fewest contaminants above EWG health guidelines — stricter benchmarks than EPA legal limits. While no tap water is perfectly pure, these communities have some of the best municipal water quality available.
Rankings at a Glance
Adamsville, Tennessee
Adamsville has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Adamsville water report →Berlin, New Hampshire
Berlin has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Berlin water report →Henderson, Tennessee
Henderson has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Henderson water report →Halls, Tennessee
Halls has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Halls water report →South Fulton, Tennessee
South Fulton has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full South Fulton water report →Winchester, New Hampshire
Winchester has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Winchester water report →Dyer, Tennessee
Dyer has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Dyer water report →Gorham, New Hampshire
Gorham has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Gorham water report →Lancaster, New Hampshire
Lancaster has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Lancaster water report →Saltillo, Tennessee
Saltillo has zero contaminants exceeding EWG health guidelines, with 0 total detected — all within safe levels.
See full Saltillo water report →What We Found: Key Patterns
A diverse range of contaminants were found across the analyzed cities.
Geographically, the states most represented in this ranking are Tennessee (6), New Hampshire (4). Regional water sources, industrial activity, and agricultural runoff all contribute to local water quality variation.
Across all ranked cities, 0 contaminant readings exceed EWG health guidelines, but only 0 exceed EPA legal limits. This gap of 0 highlights how legal standards may not fully protect public health — EPA limits haven't been updated for many contaminants in decades.
Full Rankings Table
| Rank | City | State | Detected | Above Guidelines | Above Legal | People Served |
|---|---|---|---|---|---|---|
| 1 | Adamsville | TN | 0 | 0 | 0 | 9,750 |
| 2 | Berlin | NH | 0 | 0 | 0 | 9,500 |
| 3 | Henderson | TN | 0 | 0 | 0 | 8,810 |
| 4 | Halls | TN | 0 | 0 | 0 | 5,306 |
| 5 | South Fulton | TN | 0 | 0 | 0 | 3,932 |
| 6 | Winchester | NH | 0 | 0 | 0 | 2,800 |
| 7 | Dyer | TN | 0 | 0 | 0 | 2,768 |
| 8 | Gorham | NH | 0 | 0 | 0 | 2,630 |
| 9 | Lancaster | NH | 0 | 0 | 0 | 2,450 |
| 10 | Saltillo | TN | 0 | 0 | 0 | 2,092 |
Frequently Asked Questions
What city has the cleanest tap water in the US?
Based on 2026 data, Adamsville, TN has the fewest contaminants exceeding health guidelines among the cities we analyzed.
Does clean tap water mean no filtration is needed?
Even the cleanest municipal water contains some contaminants. While these cities perform well, a quality filter provides an additional layer of protection, especially for sensitive populations like children and the elderly.
How often is water quality data updated?
EPA and EWG data is typically updated annually. Water quality can change due to seasonal variation, infrastructure changes, and contamination events.
What makes some cities' water cleaner than others?
Water quality depends on the source (groundwater vs surface water), local geology, nearby industrial and agricultural activity, water treatment methods, and infrastructure age.
Related Reports
Data sources: Environmental Working Group (EWG) Tap Water Database, U.S. EPA Safe Drinking Water Information System (SDWIS)
Last updated: April 2026
Methodology: Contaminant levels are compared against both EPA legal limits (Maximum Contaminant Levels) and EWG health guidelines, which are often stricter and based on the latest scientific research.
