Unicoi County Water Quality
Unicoi 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.
LithiumERWIN UTILITIES AUTHORITY10 µg/L EPA health reference level (screening, not a legal limit) · US EPA51.1 µg/L
- ERWIN UTILITIES AUTHORITY51.1 µg/LSample date: 2023-11-08 to 2024-08-22
Perfluorooctanesulfonic acid (PFOS)ERWIN UTILITIES AUTHORITY4.0 ng/L federal MCL (2024) · US EPA6.7 ng/L
- ERWIN UTILITIES AUTHORITY6.7 ng/LSample date: 2023-11-08 to 2024-08-22
Perfluorooctanoic acid (PFOA)ERWIN UTILITIES AUTHORITY4.0 ng/L federal MCL (2024) · US EPA4.1 ng/L
- ERWIN UTILITIES AUTHORITY4.1 ng/LSample date: 2023-11-08 to 2024-08-22
Perfluorohexanesulfonic acid (PFHxS)ERWIN UTILITIES AUTHORITY10 ng/L federal MCL (2024) · US EPA3.6 ng/L
- ERWIN UTILITIES AUTHORITY3.6 ng/LSample date: 2023-11-08 to 2024-08-22
Lead (90th percentile)ERWIN UTILITIES AUTHORITY15 µg/L federal action level · US EPA0.6 µg/L
- ERWIN UTILITIES AUTHORITY0.6 µg/LMonitoring period: 2023–2025
Perfluorobutanesulfonic acid (PFBS)ERWIN UTILITIES AUTHORITY2,000 ng/L EPA health advisory (screening, not a legal limit) · US EPA7.5 ng/L
- ERWIN UTILITIES AUTHORITY7.5 ng/LSample date: 2023-11-08 to 2024-08-22
25 PFAS tested, none detected in this systemShow
Tested in this system: ERWIN UTILITIES AUTHORITY
- 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)
- 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)
- Perfluorobutanoic acid (PFBA)
- Perfluorodecanoic acid (PFDA)
- Perfluorododecanoic acid (PFDoA)
- Perfluoroheptanesulfonic acid (PFHpS)
- Perfluoroheptanoic acid (PFHpA)
- Perfluorohexanoic acid (PFHxA)
- Perfluorononanoic acid (PFNA)
- 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 TennesseeLargest water systems
- ErwinERWIN UTILITIES AUTHORITY · TN000023112,478 served
Frequently asked
How does Unicoi County tap water compare across cities?
PurityMap ranks 1 city in Unicoi 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 Erwin's main water system: ERWIN UTILITIES AUTHORITY · PWSID TN0000231 · Purity Score 63 (Fair) · Confidence: moderate · 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 Unicoi County cities had a PFAS sample above a 2024 EPA limit?
1 of 1 Unicoi County city report had a PFAS sample above a 2024 EPA limit in EPA's UCMR 5 testing, including Erwin (PFOS 6.7 ng/L). That limit is judged on a yearly average, and water systems have until 2029 to meet it, so a single sample is not a violation. PFAS were detected at any level in 1.
Is there lead in Unicoi County tap water?
Utilities report lead as a 90th-percentile result from home taps. 1 of 1 Unicoi 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.
Follow Unicoi County's water
Get an email when a city record in the county changes. Or go straight to the filters certified for what was found here.
Record changes only
We email when places in Unicoi County get new results. Unsubscribe any time.
Follow Unicoi County's water →