Clark County, Nevada: drinking water report. Clark County is the Las Vegas metro – 2.3 million people living in the Mojave Desert, almost entirely
Clark County is the Las Vegas metro – 2.3 million people living in the Mojave Desert, almost entirely dependent on a single source: the Colorado River via Lake Mead. The Southern Nevada Water Authority (SNWA) draws water through intake pipes that have been extended and lowered multiple times as Lake Mead's level has dropped. When the lake hit its historic low in 2022, the top intake was nearly exposed. SNWA completed a third, deeper intake – dubbed the "third straw" – to ensure continued access even at critically low reservoir levels.
Colorado River water arrives in Clark County carrying high mineral content from its 1,400-mile journey. According to USGS monitoring, total dissolved solids in Lake Mead water average around 700 mg/L – roughly double the national median for municipal supplies. That hardness affects taste and scale buildup but is not itself a health concern.
On PFAS, the EPA's UCMR5 program has detected compounds at sampling points in the SNWA system. Nellis Air Force Base, located within the Las Vegas Valley, is a confirmed PFAS source from historical firefighting foam use. SNWA's treatment plants use ozone and activated carbon, which provide partial PFAS removal, but the county does not have dedicated PFAS treatment infrastructure. Nevada has not adopted state-specific PFAS standards.
Clark County's near-total dependence on a single source means water quality is relatively uniform across the metro compared to counties with fragmented systems. But that uniformity also means there is no escape if the source is compromised.
Check your water for the latest monitoring data in your area. For hardness, a water softener improves taste and protects plumbing. For PFAS, a reverse osmosis or activated carbon filter is the household-level solution. Our water filter guide covers both. Get your detailed report for historical data, and see our Nevada page for statewide context.