Washington County, Utah: drinking water report. Washington County sits in Utah's southwestern corner, anchoring the St.
Washington County sits in Utah's southwestern corner, anchoring the St. George metropolitan area along with Hurricane, Ivins, and Santa Clara. The Virgin River system and groundwater from the Navajo Aquifer supply most residents, supplemented by water from the Quail Creek and Sand Hollow reservoirs. This desert county manages limited water resources under conditions of rapid population growth and agricultural legacy.
Utah's drinking water generally tests below federal health limits for most regulated contaminants, but Washington County faces challenges common to the Colorado Plateau region. The area's geology contributes naturally occurring uranium, arsenic, and radium to groundwater sources. Multiple utilities drawing from similar aquifer formations report detectable levels of these radionuclides, though typically within EPA standards. The porous sandstone geology means contaminants can travel through groundwater corridors that serve both agricultural and municipal wells.
PFAS monitoring under EPA's UCMR5 program found these persistent chemicals in several Utah water systems, and Washington County's reliance on groundwater means vulnerability to industrial runoff, firefighting foam residues from municipal airports, and septic system discharge. Desert soils provide less natural filtration than clay-rich environments elsewhere. The region's explosive residential development since 2000 has expanded water infrastructure faster than comprehensive contamination mapping can occur, creating knowledge gaps about emerging contaminant profiles.
Disinfection byproducts form when chlorine or chloramine treatment interacts with organic matter in surface water. Systems drawing from the Virgin River or reservoir sources must balance microbial safety against trihalomethane and haloacetic acid formation. Water hardness is notably high throughout the county, leaving mineral deposits but posing no health threat. Lead contamination depends primarily on housing age, with pre-1986 plumbing in older St. George neighborhoods presenting the greatest risk during plumbing repairs or periods of water stagnation.
Request your utility's latest Consumer Confidence Report to understand which contaminants appear in your specific system and at what levels. Consider testing private wells annually for uranium, arsenic, and nitrates given the county's geology and agricultural history. Check your water to see current data for your address, review our water filter guide for treatment options suited to desert water chemistry, access your detailed report for comprehensive contaminant information, or visit the Utah state page for broader context on drinking water across the region.