Utah Private Well Water Quality 2026

The Geology Problem: Arsenic and Uranium in Utah Groundwater

Unlike states where industrial contamination is the primary well water threat, Utah’s most widespread risk comes from the ground itself. The Utah Geological Survey identifies arsenic, uranium, lead, nitrate, and chloride as among the most common inorganic groundwater pollutants in the state — most of them naturally occurring from the volcanic rocks, volcanic-derived sediments, and valley-fill deposits that make up Utah’s aquifers.

Arsenic in Utah groundwater occurs across the state. Elevated concentrations have been documented in Sanpete County, where arsenic levels in groundwater may be associated with poultry farming operations in addition to natural geology. Isolated elevated arsenic levels elsewhere are linked to volcanic rocks or volcanic-derived sediments in valley-fill deposits. This is a statewide geological pattern — not a localised industrial problem — which means every private well in Utah should be tested for arsenic regardless of location.

Uranium follows a similar pattern. The federal MCL for uranium is 30 µg/L, and uranium from geological sources is present throughout Utah’s groundwater system. The Utah Department of Health and Human Services specifically names uranium, alongside arsenic and radon, as naturally occurring contaminants of concern for well users in the state. USGS research confirms that arsenic and uranium frequently co-occur in groundwater — wells testing high for one should be tested for both.

The USGS national study of private wells found that arsenic exceeded the MCL of 10 µg/L in about 7% of wells sampled nationally, rising to around 16% in Southwest basin-fill aquifers — the geological formation type that covers much of Utah. Utah-specific data confirms this elevated rate: research published in peer-reviewed literature found that approximately 15% of private wells in Utah’s Cache Valley Basin (northern Utah) have arsenic concentrations above the MCL. A separate Great Basin study found a greater than 50% probability of elevated arsenic for well users drawing from alluvial aquifers across western Utah. Long-term arsenic exposure is linked to cancers of the bladder, lung, and skin, as well as cardiovascular disease. Uranium at elevated levels is associated with kidney damage. Neither has any taste, colour, or odour at the concentrations found in groundwater.

PFAS in Utah: Military Bases, Airports — and Ski Wax

Utah’s overall PFAS risk in public water is relatively low. The Utah DEQ’s statewide reconnaissance programme found that most drinking water samples fall well below EPA limits, and PFAS is not manufactured in Utah. However, three sites in the state have confirmed PFAS contamination in groundwater: Hill Air Force Base in Davis County, Camp Williams (which straddles the Salt Lake / Utah County border near Bluffdale), and the Salt Lake City International Airport — all identified by the Environmental Working Group from Department of Defense records.

At Hill AFB, the Air Force is currently in the active remedial investigation phase for PFAS contamination. In May 2025, Air Force representatives briefed Layton City Council on expanding investigations into shallow groundwater near the base, with multiple areas of firefighting-foam use identified as sources. Extraction wells and interim treatment systems are in place, and the Air Force has stated no residents are currently drinking PFAS-contaminated water attributable to the base. However, private well owners in the wider Davis County area near the base boundary should be aware of the ongoing investigation and monitor updates from the Utah DEQ.

Separately, in March 2024, the Salt Lake City Department of Public Utilities announced that PFAS were detected in two of its public groundwater wells — though those wells were not contributing to the drinking water distribution system at the time.

In Park City (Summit County), a distinctly unusual contamination source has been confirmed: fluorinated ski wax. PFAS were first detected in Park City’s three groundwater wells in 2022, with levels of up to 8 ppt — above the EPA’s 4 ppt MCL for PFOA and PFOS. The city’s water quality team identified fluoro ski wax as the probable source, as the specific PFAS compounds found matched those in ski wax rather than firefighting foam or industrial sources. In September 2024, the Utah Division of Drinking Water approved Park City’s compliance plan — a blending strategy mixing PFAS-free surface-treated water with affected well water — making it the first water system in Utah to gain state PFAS compliance approval, 4.5 years ahead of the original 2029 deadline. Park City banned fluoro ski wax via a source protection ordinance in 2023 and runs an ongoing wax take-back programme. Private wells in the Park City and wider Summit County area should be tested for PFAS.

Four additional Utah military sites are suspected of PFAS contamination from historical AFFF firefighting foam use, though formal confirmation remains pending. Statewide, 26 of 85 Utah water systems tested have discovered at least trace amounts of PFAS, according to reporting by the Salt Lake Tribune. Utah DEQ continues to expand its monitoring programme.

Nitrate, Bacteria, and Other Risks

Nitrate contamination in Utah groundwater primarily affects areas with agricultural activity, particularly where animal waste, fertiliser runoff, and septic systems are concentrated. The Utah Geological Survey notes that some of the highest nitrate concentrations found in the shallow Salt Lake Valley aquifer occurred near animal pens. The federal MCL for nitrate is 10 mg/L; elevated levels are particularly dangerous for infants under six months, potentially causing methemoglobinemia (blue baby syndrome).

Bacterial contamination is an ongoing risk for any private well — particularly older wells with compromised casings, shallow wells near septic systems, or wells in areas prone to seasonal flooding. E. coli and total coliform bacteria testing should form the baseline of any well testing programme, repeated annually.

For properties near the Bingham Canyon Copper Mine area (southwest Salt Lake County), groundwater contamination from mine seepage — including elevated metals and high total dissolved solids — is a documented concern. Cleanup operations by the mining company are ongoing, but private well owners in affected areas should not assume remediation is complete.

Regulatory Situation for Utah Well Owners

Private residential wells in Utah are not regulated under the federal Safe Drinking Water Act, and Utah has no state law requiring mandatory testing of private wells. The Utah Division of Drinking Water regulates public water systems but has no authority over private well water quality. Testing and treatment are entirely the well owner’s responsibility.

Utah has no state-level PFAS MCLs of its own — the federal EPA limits of 4 ppt for PFOA and PFOS apply to public water systems only. Private well owners are outside that regulatory framework entirely. Utah DEQ’s PFAS programme currently prioritises assisting community water systems with initial monitoring; private well assistance may be considered in future programme phases but is not currently available.

Check our Utah municipal water quality page for city-by-city tap water data, our Salt Lake City water quality page, or use our live boil water notice tracker for active advisories across the state.

Known High-Risk Areas in Utah

If you live near any of the following locations, well water testing is urgent — not precautionary.

How to Test Your Utah Well Water — and What to Do Next

Given Utah’s geological contamination profile, testing for arsenic and uranium should be a first priority for every private well owner in the state — regardless of county or proximity to industrial activity. These are naturally occurring contaminants with no taste or odour, present because of what the ground is made of rather than what’s been done to it. The Utah DHHS and Utah Geological Survey both recommend testing private wells for inorganic contaminants including arsenic.

For well owners near military facilities, the Salt Lake City Airport, or in the Park City area, PFAS testing should be added as an urgent priority. Contact your local county health department to obtain a referral to a certified laboratory, or use the Utah DEQ’s Division of Drinking Water resources at deq.utah.gov to find accredited labs in your area.

For filter options, our well water filter guide covers reverse osmosis systems for arsenic, uranium, and PFAS, UV disinfection for bacteria, and whole-house well systems for comprehensive protection. You can also browse our full water filter solutions page or check your ZIP code for local water quality context.

For other Western state well water risks, see our pages on Michigan wells and Ohio wells. Return to the private well water directory to find your state.