Tennessee water quality
Tennessee has 1,902 active public water systems (6,152 on file total), 450 of them graded by TapGraded.
Grade distribution
Biggest water systems
MEMPHIS LIGHT, GAS, & WATER
MEMPHIS, TN · 659,500 served
KNOXVILLE UTILITIES BOARD - KUB
KNOXVILLE, TN · 254,671 served
CLARKSVILLE WATER DEPARTMENT
CLARKSVILLE, TN · 251,864 served
CONSOLIDATED U.D. OF RUTHERFORD CO
MURFREESBORO, TN · 221,871 served
TENNESSEE AMERICAN WATER
CHATTANOOGA, TN · 207,046 served
WHITE HOUSE UTILITY DISTRICT
WHITE HOUSE, TN · 130,411 served
FIRST U.D. OF KNOX COUNTY
KNOXVILLE, TN · 115,531 served
MURFREESBORO WATER DEPARTMENT
MURFREESBORO, TN · 114,331 served
KINGSPORT WATER DEPT
KINGSPORT, TN · 107,739 served
JOHNSON CITY WATER DEPT
JOHNSON CITY, TN · 105,057 served
Lowest-graded systems
Active, graded systems serving at least 10,000 people, ordered by lowest Tap Grade first.
BEDFORD COUNTY U.D.
SHELBYVILLE, TN · 22,908 served
WOODLAWN UTILITY DISTRICT
WOODLAWN, TN · 12,069 served
HARTSVILLE-TROUSDALE W&S U.D.
HARTSVILLE, TN · 10,562 served
WILSON CO WATER & WASTEWATER
LEBANON, TN · 22,680 served
FENTRESS COUNTY U.D.
JAMESTOWN, TN · 16,845 served
MURFREESBORO WATER DEPARTMENT
MURFREESBORO, TN · 114,331 served
FRANKLIN WATER DEPT
FRANKLIN, TN · 77,222 served
NOLENSVILLE-COLLEGE GROVE U.D.
NOLENSVILLE, TN · 34,159 served
CUNNINGHAM UTILITY DISTRICT
CLARKSVILLE, TN · 16,068 served
CUMBERLAND UTILITY DISTRICT
HARRIMAN, TN · 14,085 served
Cities in Tennessee
Source: EPA SDWIS/ECHO · Data as of 2026Q2