Mohave County, Arizona: drinking water report. Mohave County in northwestern Arizona has about 213,000 residents spread across a vast desert landscape,
Mohave County in northwestern Arizona has about 213,000 residents spread across a vast desert landscape, with Kingman, Bullhead City, and Lake Havasu City as the major communities. Water comes from groundwater basins and Lake Havasu (a Colorado River reservoir), depending on location. The county's extreme aridity – Bullhead City regularly records the hottest temperatures in the country – makes water both scarce and mineral-heavy.
Total dissolved solids and hardness are the baseline water quality issues across Mohave County. According to ADEQ's 2024 water quality data, groundwater TDS in the Hualapai Basin exceeds 1,500 mg/L in some production zones, and multiple systems report hardness above 300 mg/L. Communities on Colorado River water from Lake Havasu receive better-quality source water, but even that supply carries elevated mineral content from the river's passage through desert geology.
The former Kingman Airport was an Army Air Corps training base during WWII and has documented AFFF use. ADEQ's 2024 PFAS investigation found PFOS at 8 ppt in monitoring wells near the airport. Naturally occurring fluoride in some Mohave County wells exceeds the MCL of 4 mg/L – a dental and skeletal health concern with long-term exposure.
Mohave County's desert groundwater requires treatment for mineral content alone, regardless of any industrial contamination. If your water leaves white or brown deposits on fixtures, those minerals are also in the water you drink.
Check your water for data at your address. Reverse osmosis is the go-to technology for high-mineral desert water and handles fluoride and PFAS at the same time. Our water filter guide covers systems designed for desert conditions. Pull your detailed report for local data, and visit our Arizona page for statewide patterns.