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Tennessee Water Quality
403
Utilities in database
7.8M
Residents served
22%
On private wells
2
Key contaminants tracked
Drinking Water in Tennessee
Tennessee has 403 community water systems serving approximately 7.8 million residents. Primary water sources include surface water. The most commonly reported contaminants include disinfection byproducts, nitrates. 22% of Tennessee residents rely on private wells. TDEC holds primary enforcement authority under the Safe Drinking Water Act.
Utilities in Tennessee
51–75 of 403Nolensville-college Grove U.d.
TN0000511 · 32,793 served
Elizabethton Water Dept
TN0000221 · 32,490 served
Tullahoma Utilities Authority
TN0000715 · 30,958 served
Savannah Valley U.d.
TN0000613 · 30,571 served
Brentwood Water Department
TN0000069 · 30,493 served
Mallory Valley U.d.
TN0000428 · 30,347 served
Warren County Utility District
TN0000818 · 29,827 served
Northeast Knox U.d.
TN0000515 · 27,941 served
Lafollette Utilities Board
TN0000374 · 27,637 served
Greeneville Water Commission
TN0000273 · 26,657 served
Athens Utilities Board
TN0000024 · 26,424 served
Lexington Water Systems
TN0000402 · 26,322 served
Anderson County Water Auth
TN0000514 · 25,700 served
Shady Grove Utility District
TN0000626 · 25,320 served
Dayton Water Dept
TN0000174 · 25,054 served
Manchester Water Department
TN0000429 · 24,975 served
Winchester Water System
TN0000754 · 24,899 served
Lewisburg Water System
TN0000400 · 24,569 served
Maury Co Water System
TN0000770 · 24,488 served
Lincoln Co B.p.u. #1
TN0000764 · 23,846 served
Portland Water System
TN0000559 · 23,509 served
Bedford County U.d.
TN0000517 · 22,908 served
Wilson Co Water & Wastewater
TN0000790 · 22,680 served
Cumberland Plateau Water Authority
TN0000147 · 22,673 served
Lafayette Water System
TN0000373 · 21,551 served
Key Contaminant Concerns in Tennessee
Nitrates
Nitrate (NO₃⁻) is a nitrogen-containing compound that forms naturally through the decomposition of organic matter. At elevated concentrations — almost always from human activity — nitrate interferes with the blood's ability to carry oxygen. The United States produces over 23 million tons of nitrogen fertilizer annually, making agricultural runoff the dominant source of nitrate contamination.
DBPs
When utilities add chlorine to water to kill pathogens, it reacts with dissolved organic matter — leaves, algae, soil — to produce disinfection byproducts (DBPs). Over 600 DBPs have been identified. The EPA regulates two groups: total trihalomethanes (TTHMs, including chloroform) and haloacetic acids (HAA5). DBP levels tend to be highest in surface water systems and in warm months when organic matter is elevated.
Tennessee Water FAQs
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Data source: Utility data from EPA SDWIS. 403 active community water systems ingested. CCR contaminant data ingestion in progress.
Last updated: 2026-04-19