Private Well Water Testing in Utah
County-by-county USGS area-risk estimates for private wells across Utah — arsenic exceedance probability and private-well population — plus how to test your own well at a Utah-certified laboratory.
Utah private-well risk summary
Counties covered
29
Utah counties with modeled risk data.
People on private wells
area estimate78,160
estimated across covered Utah counties.
Average arsenic risk
area estimate8%
average modeled chance a well exceeds 10 µg/L arsenic across covered counties.
Utah counties
- Utah County4% arsenic exceedance (area estimate)16,339 people on private wells
- Salt Lake County5% arsenic exceedance (area estimate)6,753 people on private wells
- Duchesne County7% arsenic exceedance (area estimate)5,812 people on private wells
- Tooele County14% arsenic exceedance (area estimate)5,705 people on private wells
- Cache County6% arsenic exceedance (area estimate)4,591 people on private wells
- Iron County11% arsenic exceedance (area estimate)3,883 people on private wells
- San Juan County7% arsenic exceedance (area estimate)3,701 people on private wells
- Davis County5% arsenic exceedance (area estimate)3,615 people on private wells
- Weber County7% arsenic exceedance (area estimate)3,191 people on private wells
- Box Elder County11% arsenic exceedance (area estimate)2,953 people on private wells
- Wasatch County4% arsenic exceedance (area estimate)2,761 people on private wells
- Summit County5% arsenic exceedance (area estimate)2,641 people on private wells
- Sanpete County4% arsenic exceedance (area estimate)2,454 people on private wells
- Morgan County6% arsenic exceedance (area estimate)2,408 people on private wells
- Millard County12% arsenic exceedance (area estimate)2,337 people on private wells
- Uintah County7% arsenic exceedance (area estimate)1,798 people on private wells
- Sevier County8% arsenic exceedance (area estimate)1,625 people on private wells
- Washington County8% arsenic exceedance (area estimate)1,190 people on private wells
- Grand County6% arsenic exceedance (area estimate)1,138 people on private wells
- Beaver County12% arsenic exceedance (area estimate)689 people on private wells
- Juab County9% arsenic exceedance (area estimate)676 people on private wells
- Garfield County9% arsenic exceedance (area estimate)559 people on private wells
- Rich County16% arsenic exceedance (area estimate)487 people on private wells
- Wayne County10% arsenic exceedance (area estimate)309 people on private wells
- Piute County17% arsenic exceedance (area estimate)154 people on private wells
- Kane County6% arsenic exceedance (area estimate)145 people on private wells
- Carbon County5% arsenic exceedance (area estimate)95 people on private wells
- Emery County6% arsenic exceedance (area estimate)81 people on private wells
- Daggett County5% arsenic exceedance (area estimate)70 people on private wells
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Upload my well testThese figures are USGS area estimates: statistical groundwater models describing how likely elevated contaminant levels are across a county. They are not designed to predict the concentration in any single well. Only testing your own well reveals its water quality.
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