Water in Tennessee.
Memphis sits on the Memphis Sand Aquifer — extraordinary natural source water. East Tennessee's reliance on Tennessee River and tributaries means TTHMs dominate exposure. The 2008 Kingston coal-ash spill remains the largest U.S. industrial environmental disaster.
How Tennessee regulates drinking water.
Federal SDWA primacy. No state MCLs stricter than federal. Active coal-ash and TVA-site remediation oversight.
Tennessee Department of Environment and Conservation — Division of Water Resources
Tennessee's water history, in order.
The contamination events, regulatory shifts, and major settlements that define how this state thinks about drinking water today.
- 2008
Kingston coal-ash spill — 1.1B gallons of coal ash slurry breach — largest U.S. industrial environmental disaster.
- 2019
Kingston cleanup workers' health crisis becomes national news.
The actual water you drink.
The physical rivers, aquifers, lakes, and reservoirs that feed Tennessee's public water systems. Source quality is the foundation of tap quality — and where the long-term protection fights happen.
- aquiferMemphis Sand Aquifer
Memphis — extraordinary natural source.
- riverCumberland River
Nashville supply.
- riverTennessee River
East TN.
- riverHolston + French Broad Rivers
Knoxville.
Source-water mix
~80% surface water, ~20% groundwater
Major cities served
Nashville · Memphis · Knoxville · Chattanooga · Clarksville
Who actually serves the water.
The largest public water systems in Tennessee by population served. Click your ZIP after to see the full live EWG report for your specific utility.
- Nashville Metro Water ServicesNashville700Kserved
- Memphis Light, Gas and WaterMemphis· Draws from the Memphis Sand Aquifer.Draws from the Memphis Sand Aquifer.870Kserved
- Knoxville Utilities BoardKnoxville280Kserved
Where the contamination comes from.
Every state has a different industrial fingerprint. The industries below are the dominant historical and active contamination sources in Tennessee's drinking water systems.
Kingston coal-ash spill (2008) was the largest U.S. industrial environmental disaster; long-term Roane County contamination persists. Oak Ridge National Laboratory radiological legacy. Eastman Chemical (Kingsport) industrial corridor.
What state data flags most consistently.
Drawn from EPA SDWIS sampling records, EWG state summaries, and regional regulatory action over the past five years. Read the full deep dive on each.
Trihalomethanes (TTHMs)
Byproducts of chlorinating water. Linked to bladder cancer at chronic exposure.
PFAS (Forever Chemicals)
A class of ~15,000 synthetic chemicals that don't break down. Now regulated for the first time.
Lead
A neurotoxic metal that leaches from old pipes and solder. No safe level for children.
Chromium-6 (Hexavalent Chromium)
The Erin Brockovich chemical. A known carcinogen with no federal-specific limit yet.
Risk isn't evenly distributed.
Roane County residents downstream of Kingston coal-ash spill face long-term arsenic, mercury, and selenium exposure. Memphis residents have exceptional source water but pre-1986 lead in housing.
~15% on private wells, mostly rural east TN.
What's coming for Tennessee's water.
Cumberland River algal bloom risk increases. Memphis Sand Aquifer recharge concerns under shifting precipitation. Hurricane remnants flood eastern TN treatment plants.
Voluntary statewide
TN Department of Environment and Conservation provides voluntary technical assistance.
Five questions for your next Consumer Confidence Report.
Your utility is required to send you a Consumer Confidence Report annually. Most are dense and procedural. These are the questions worth following up on for Tennessee specifically.
- 1
If I'm in Roane County, is my well in the Kingston coal-ash spill remediation zone?
- 2
Has my Knoxville-area utility been impacted by Oak Ridge legacy contamination?
- 3
What is my system's PFAS testing status?
Most state regulators allow public records requests for the underlying lab reports behind your CCR — your utility should be able to provide them on request.
For TTHMs and PFAS in east TN: NSF/ANSI 53 + P473 carbon. For Memphis lead: NSF/ANSI 53.
We don't recommend brands — the NSF/ANSI certification number matters more than the name on the box.
This is the state. Your address is the answer.
State-level patterns don't tell you about your specific tap. Run your ZIP for the live EWG contaminant report on your utility — or build a personalized Water File for your household.
Source-water mix, utility counts, lead-service-line estimates, and private-well shares are approximate, drawn from EPA SDWIS public data and state primacy-agency summaries. Contaminant rankings reflect EWG state-level monitoring data and regional regulatory action — they are not exhaustive. Timeline events are publicly documented. See methodology for the full sourcing. Search EPA SDWIS for Tennessee