Nashville TN metro: water quality. Nashville's 2 million residents receive drinking water primarily from the Cumberland River, treated at two plants
Nashville's 2 million residents receive drinking water primarily from the Cumberland River, treated at two plants operated by Metro Water Services: the K.R. Harrington and Omohundro facilities. The Cumberland is a working river – it receives agricultural runoff from middle Tennessee farmland, treated effluent from upstream communities, and stormwater from the Nashville metro itself. The treatment plants process roughly 180 million gallons per day during peak demand.
The metro spans 14 counties, though the core water infrastructure serves Davidson County and parts of neighboring counties. Outlying communities operate smaller independent systems, some drawing from the Cumberland and others from local reservoirs or wells.
Nashville sits in a less contaminated zone for PFAS compared to many American metros. Tennessee does not have major military AFFF contamination sites within the Nashville metro footprint, though Arnold Air Force Base in Tullahoma (about 80 miles southeast) has documented PFAS contamination.
UCMR5 monitoring for Metro Water Services has shown PFAS detections at low levels – present but below the federal MCLs. The Cumberland River's main PFAS inputs come from wastewater treatment plant discharges upstream, a common pattern for river-sourced systems.
Tennessee has not set state-specific PFAS MCLs, relying on federal EPA standards. The Tennessee Department of Environment and Conservation (TDEC) has been conducting targeted PFAS sampling but has not published a full statewide investigation comparable to states like Michigan or North Carolina. According to TDEC's available monitoring data, PFAS detections in the Nashville metro have been modest relative to industrial states.
Nashville's PFAS profile is lower than most comparable-sized metros, partly because middle Tennessee lacks the heavy military base density and concentrated industrial PFAS manufacturing that drive contamination in Michigan, Ohio, and the Carolinas.
The city's bigger water quality challenge may be disinfection byproducts. Treating warm, organic-rich river water with chlorine produces trihalomethanes (THMs) and haloacetic acids – compounds the EPA regulates due to cancer risk from long-term exposure. Nashville's system has historically operated near federal limits for these compounds during summer months, when water temperatures and organic matter peak.
Visit our Tennessee state page for statewide data.
Nashville's relatively clean PFAS profile doesn't mean there's nothing to watch. Disinfection byproducts, lead in older homes, and the variability of smaller systems outside Davidson County are all relevant.
Check your water to see current data for your area. If DBPs or lead are your main concerns, a pitcher filter or under-sink system certified to NSF 53 covers both – our water filter guide breaks down the options. A detailed report can show seasonal variation, which matters for a river-sourced system where summer brings the highest contaminant formation.