Hamilton County Water Quality
Hamilton County, Tennessee: one city report built from EPA and utility records. A county has many suppliers; each city shows the system that serves it.
Highest result for each contaminant
One row per contaminant: the highest result any system in the county reported, against its limit. Open a row for the systems behind it.
Total trihalomethanes (TTHM)TENNESSEE AMERICAN WATER80 ppb federal MCL · US EPA53 ppb
- TENNESSEE AMERICAN WATER53 ppbReporting year: 2025
Haloacetic acids (HAA5)TENNESSEE AMERICAN WATER60 ppb federal MCL · US EPA28 ppb
- TENNESSEE AMERICAN WATER28 ppbReporting year: 2025
FluorideTENNESSEE AMERICAN WATER4.0 mg/L · US EPA0.69 mg/L
- TENNESSEE AMERICAN WATER0.69 mg/LReporting year: 2025
Lead (90th percentile)TENNESSEE AMERICAN WATER15 µg/L federal action level · US EPA1 µg/L
- TENNESSEE AMERICAN WATER1 µg/LMonitoring period: 2023–2025
CopperTENNESSEE AMERICAN WATER1.3 mg/L (action level) · US EPA0.071 mg/L
- TENNESSEE AMERICAN WATER0.071 mg/LReporting year: 2025
NitrateTENNESSEE AMERICAN WATER10 mg/L · US EPA0.31 mg/L
- TENNESSEE AMERICAN WATER0.31 mg/LReporting year: 2025
Perfluorobutanesulfonic acid (PFBS)TENNESSEE AMERICAN WATER2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA9.5 ng/L
- TENNESSEE AMERICAN WATER9.5 ng/LSample date: 2024-03-06 to 2024-12-10
Water hardnessTENNESSEE AMERICAN WATERAesthetic, no federal health limit · USGS4.4 gpg
- TENNESSEE AMERICAN WATER4.4 gpgReporting year: 2025
1 more contaminant detectedShow
Perfluorobutanoic acid (PFBA)TENNESSEE AMERICAN WATERNo federal or state limit; shown for transparency8.5 ng/L
- TENNESSEE AMERICAN WATER8.5 ng/LSample date: 2024-03-06 to 2024-12-10
28 substances tested, none detected in this systemShow
Tested in this system: TENNESSEE AMERICAN WATER
- 11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
- 1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
- 1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
- 1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
- 4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
- 9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
- Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
- Lithium
- N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
- N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
- Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
- Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
- Perfluoro-3-methoxypropanoic acid (PFMPA)
- Perfluoro-4-methoxybutanoic acid (PFMBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanesulfonic acid (PFHxS)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- Perfluorooctanesulfonic acid (PFOS)
- Perfluorooctanoic acid (PFOA)
- Perfluoropentanesulfonic acid (PFPeS)
- Perfluoropentanoic acid (PFPeA)
- Perfluorotetradecanoic acid (PFTA)
- Perfluorotridecanoic acid (PFTrDA)
- Perfluoroundecanoic acid (PFUnA)
Cities ranked by the records
Ranked by the Purity Score of each city's main water system, highest first. Scores belong to water systems; there is no county score. The score is computed only from contaminants measured in the published EPA record, so this ranks the record, not which city's water is safest. How the score works.
0of 1 city above the 15 µg/L action level
Based on each system's 90th-percentile result. Lead from household plumbing isn't in this record.
Lead in Tennessee1city reports hardness · Chattanooga, 4.4 gpg
None above 7 gpg, the USGS threshold for hard water. An aesthetic measure with no federal health limit.
Hard water explainedLargest water systems
- ChattanoogaTENNESSEE AMERICAN WATER · TN0000107207,046 served
Frequently asked
How does Hamilton County tap water compare across cities?
PurityMap ranks 1 city in Hamilton County by the Purity Score of each city's main water system, computed only from contaminants measured in the published EPA record. Scores belong to water systems, not to cities. The highest published score is Chattanooga's main water system: TENNESSEE AMERICAN WATER · PWSID TN0000107 · Purity Score 93 (Excellent) · Confidence: high · Assessed at the water-system level. The ranking compares the records, not which city's water is safest, and your own tap can differ with household plumbing.
How many Hamilton County cities have PFAS above the federal limit?
None of the 1 Hamilton County cities on record had a regulated PFAS above the 2024 federal limit in EPA's UCMR 5 testing. PFAS were detected below the limit in 1.
Is there lead in Hamilton County tap water?
Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Hamilton County cities reported a value above zero, and none was above the 15 µg/L federal action level. Lead usually comes from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
Does Hamilton County have hard water?
Hardness is published in utility water-quality reports for 1 Hamilton County city on record; the hardest is Chattanooga at 4.4 grains per gallon. Hardness affects scale and appliances; it is not a health finding.
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