Free Tennessee water report: PFAS & lead levels for every water system, worst-affected cities, and EPA violations. Check your ZIP.
Tennessee's 7.1 million residents draw water from an unusually diverse set of sources spanning three distinct geographic regions. East Tennessee's mountainous terrain feeds rivers and reservoirs through the Tennessee Valley Authority (TVA) system. Middle Tennessee relies on the Cumberland River and its tributaries, along with karst-influenced groundwater. And West Tennessee sits atop the Memphis Sand Aquifer – one of the largest and purest artesian aquifer systems in the world, supplying Memphis and surrounding communities with water that requires minimal treatment. The Tennessee Department of Environment and Conservation (TDEC) manages water quality regulation across this varied landscape.
Fort Campbell, straddling the Tennessee-Kentucky border near Clarksville, is the most prominent military PFAS source in the state. The installation, one of the largest Army bases in the country, has used AFFF extensively in fire training operations. PFAS contamination has been detected in groundwater on and around the base, and the Department of Defense is conducting remediation assessments. Communities near Fort Campbell that rely on groundwater face ongoing exposure concerns.
East Tennessee adds an industrial dimension. The region's history of heavy manufacturing – including automotive, chemical, and metals production – has left contamination legacies in watersheds across the area. Oak Ridge, home to the Department of Energy's nuclear complex, carries its own contamination history that intersects with emerging PFAS concerns. Knoxville and Chattanooga, both drawing from the Tennessee River system, receive water that has passed through industrial and agricultural zones upstream.
The Memphis Sand Aquifer in West Tennessee has so far shown minimal PFAS contamination – a reflection of the deep, well-protected nature of the aquifer. Memphis Light, Gas & Water (MLGW), the nation's largest three-service municipal utility, draws from wells tapping this aquifer and delivers some of the cleanest tap water of any major American city. However, development pressure and breaches in the confining clay layers above the aquifer have raised concerns about long-term vulnerability.
Tennessee's water quality picture is a study in contrasts. West Tennessee, anchored by the Memphis Sand Aquifer, ranks among the best in the nation for raw water quality. The aquifer naturally filters water through sand layers over hundreds of years, producing water that typically meets drinking water standards before any treatment. Memphis regularly appears on lists of cities with the best-tasting tap water in the country.
East Tennessee, by contrast, faces challenges more typical of Appalachian states – aging infrastructure, industrial contamination, and coal mining legacy. The Tennessee River, while regulated and monitored by TVA, carries the cumulative inputs of communities and industries across a large watershed.
Middle Tennessee's karst geology creates unique vulnerabilities. Sinkholes, underground streams, and fractured limestone mean that surface contamination can reach groundwater quickly. Nashville's water supply from the Cumberland River is treated conventionally, but rural communities on karst groundwater face faster contamination pathways than those on sand-and-gravel aquifers.
Tennessee has not adopted state-specific PFAS MCLs, relying on federal EPA standards. TDEC has been expanding monitoring under UCMR5, but the state's regulatory posture has been reactive rather than proactive on PFAS.
Your water quality in Tennessee depends heavily on which part of the state you live in and what your water source is.
1. Check your water quality using our free tool. The differences between West Tennessee aquifer water and East Tennessee river water are substantial, and your specific data matters. 2. If you live near Fort Campbell or in East Tennessee industrial areas, PFAS-specific testing is worth pursuing. Our water filter guide covers which filters actually remove PFAS versus which just claim to. 3. Memphis residents – your water is genuinely excellent by national standards, but do not assume that means zero risk. Check your specific data and review our detailed water report if you want to see what has been measured over time. 4. Middle Tennessee residents on private wells in karst areas should test regularly. Karst groundwater can change quality rapidly after rain events.
Tennessee's water story intersects with some of the most consequential infrastructure projects in American history. The Tennessee Valley Authority, created in 1933 as part of the New Deal, built a system of dams that transformed the Tennessee River from a flood-prone, shallow waterway into a managed chain of reservoirs. TVA's system controls water flow, generates electricity, and provides municipal water supply across the region – but it also concentrates contaminants in reservoir pools where water moves slowly.
The Memphis Sand Aquifer has been supplying the city since the 1880s. The aquifer sits beneath a confining clay layer that has historically prevented surface contamination from reaching the drinking water zone. MLGW operates more than 100 wells across the Memphis area, drawing from depths of 200 to 500 feet. The water emerges at a consistent 57 degrees Fahrenheit year-round and is so naturally clean that Memphis was one of the last major cities in the country to add chlorine treatment.
But the aquifer is not invulnerable. A 2022 study by the USGS identified locations where the protective clay layer has been breached – by old wells, construction activity, and natural geological features – creating potential pathways for surface contaminants to reach the aquifer. The Memphis metropolitan area has grown significantly over the aquifer's recharge zone, increasing the risk of contamination from development, industrial activity, and stormwater runoff.
Fort Campbell's military operations date to 1942. The base, which hosts the 101st Airborne Division, covers over 100,000 acres across Tennessee and Kentucky. Fire training areas using AFFF were standard operations for decades, and the resulting PFAS plumes are now the subject of DoD investigation and remediation planning.
Oak Ridge, established in 1943 as part of the Manhattan Project, presents a different contamination legacy entirely. While the primary concerns there are radioactive materials and industrial solvents, PFAS from fire suppression systems at the complex add to the site's long list of environmental challenges.
Check your address to see what data is available for your specific location. Tennessee's water quality varies more within its borders than almost any other state – the statewide average tells you very little about what is coming out of your tap.