Utah Water Quality
Drinking water data for all 29 counties.
Avg Water Score
47.7
State Grade
D
Counties with Data
29
of 29 total
All Utah Counties
| County | Water Score |
|---|---|
| Beaver County | 86.0 |
| Daggett County | 86.0 |
| Juab County | 86.0 |
| Sevier County | 86.0 |
| Tooele County | 86.0 |
| Uintah County | 86.0 |
| Salt Lake County | 70.4 |
| Davis County | 68.2 |
| Utah County | 64.4 |
| Box Elder County | 55.4 |
| Carbon County | 55.4 |
| Cache County | 55.2 |
| Duchesne County | 50.7 |
| Weber County | 49.3 |
| Morgan County | 42.4 |
| Sanpete County | 42.2 |
| Emery County | 35.1 |
| Washington County | 35.1 |
| Summit County | 34.2 |
| Kane County | 31.6 |
| Iron County | 30.2 |
| Grand County | 26.8 |
| Wayne County | 25.9 |
| San Juan County | 22.8 |
| Wasatch County | 20.9 |
| Piute County | 18.8 |
| Garfield County | 18.5 |
| Millard County | 7.7 |
| Rich County | 7.0 |
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Frequently Asked Questions
Which county in Utah has the best water quality?
Beaver County has the highest water quality score in Utah at 86.0/100 (Grade: A), based on EPA SDWIS data.
Which county in Utah has the most water violations?
Rich County has among the lowest water quality scores in Utah at 7.0/100. See the individual county page for detailed violation history.
Is the tap water safe to drink in Utah?
Utah has an average water quality score of 47.7/100 based on EPA Safe Drinking Water Act compliance data. Individual county scores vary — check your specific county's page for detailed information.
What contaminants are found in Utah water supplies?
Drinking water quality varies by county and water system. The EPA Safe Drinking Water Information System (SDWIS) tracks violations for contaminants like lead, nitrates, bacteria, and disinfection byproducts. See individual county pages for specific contaminant and violation history.
Data Source
Water quality data sourced from the EPA Safe Drinking Water Information System (SDWIS) via the ECHO enforcement database. Scores reflect compliance history and health-based violation counts.
Disclaimer: This data is informational only. It is not health, legal, or professional advice. For concerns about your specific water supply, contact your local water utility.