What was found in ZIP 37656
The level at this ZIP's main supplier, the highest level anywhere in it, the EPA limit for each, and where the figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Fluoride | 1026.2 µg/L 26% of the EPA limit 4000 µg/L Highest in the ZIP: JOHNSON CITY WATER DEPT · 105,057 people · 2019 | 1/2 | SYR4 |
| Nitrate | 781 µg/L 7.8% of the EPA limit 10000 µg/L Main supplier: KINGSPORT WATER DEPT · 107,739 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 559.5 µg/L 5.6% of the EPA limit 10000 µg/L Highest in the ZIP: JOHNSON CITY WATER DEPT · 105,057 people · 2019 | 1/2 | SYR4 |
| Lithium | 76.6 µg/L No EPA limit set Main supplier: KINGSPORT WATER DEPT · 107,739 people · 2023 | 1/2 | UCMR-5 |
| TTHM | 63.13 µg/L 79% of the EPA limit 80 µg/L Main supplier: KINGSPORT WATER DEPT · 107,739 people · 2019 | 2/2 | SYR4 |
| Barium | 58.355 µg/L 2.9% of the EPA limit 2000 µg/L Highest in the ZIP: JOHNSON CITY WATER DEPT · 105,057 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 51.58 µg/L 86% of the EPA limit 60 µg/L Main supplier: KINGSPORT WATER DEPT · 107,739 people · 2019 | 2/2 | SYR4 |
| Copper | 1.19 µg/L 0.1% of the EPA limit 1300 µg/L Highest in the ZIP: JOHNSON CITY WATER DEPT · 105,057 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 0.7470 pCi/L 5% of the EPA limit 15 pCi/L Highest in the ZIP: JOHNSON CITY WATER DEPT · 105,057 people · 2016 | 1/2 | SYR4 |
| PFOS | 0.0059 µg/L No EPA limit set Main supplier: KINGSPORT WATER DEPT · 107,739 people · 2023 | 1/2 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: KINGSPORT WATER DEPT · 107,739 people · 2025
Highest in the ZIP: 0.0013 mg/L — JOHNSON CITY WATER DEPT · 105,057 people · 2025 | 2/2 | LCR |
Each bar shows the measured level as a share of the EPA limit: green is
well under, amber is close to it, red is over. For lead and copper the
limit applies to exactly the 90th-percentile figure shown, so red there
means a real exceedance. For everything else the limit applies to a
running annual average while the figure is the 95th percentile of the
system's samples — over 100% is worth reading, but is not by itself a
violation.
Formal violations are listed separately.
Water suppliers serving ZIP 37656
| Supplier | State | Population served |
|---|---|---|
| KINGSPORT WATER DEPT | TN | 107,739 |
| JOHNSON CITY WATER DEPT | TN | 105,057 |
Frequently asked questions about ZIP 37656 tap water
Is the tap water in ZIP 37656 safe to drink?
EPA testing detected 11 contaminants across the water suppliers serving ZIP 37656. A detection isn't the same as a violation — most levels are within federal limits. See each level and source above, and your utility's annual Consumer Confidence Report for the official status.
Which water suppliers serve ZIP 37656?
2 public water suppliers report EPA drinking-water monitoring for ZIP 37656. Each is listed above with its population served.
What contaminants are in ZIP 37656's water?
EPA monitoring detected Fluoride, Nitrate, Nitrate-Nitrite, Lithium, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.