What was found in ZIP 37921
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 |
|---|---|---|---|
| Nitrate | 670 µg/L 6.7% of the EPA limit 10000 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019
Highest in the ZIP: 1680 µg/L — LUTTRELL-BLAINE-CORRYTON U.D. · 10,529 people · 2019 | 3/3 | SYR4 |
| Fluoride | 742.5 µg/L 19% of the EPA limit 4000 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019
Highest in the ZIP: 1617.3 µg/L — HALLSDALE-POWELL U.D. · 84,315 people · 2014 | 3/3 | SYR4 |
| Nitrate-Nitrite | 637.5 µg/L 6.4% of the EPA limit 10000 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019 | 1/3 | SYR4 |
| TTHM | 72.59499999999998 µg/L 91% of the EPA limit 80 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019
Highest in the ZIP: 106.89999999999993 µg/L — LUTTRELL-BLAINE-CORRYTON U.D. · 10,529 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 49.679999999999986 µg/L 83% of the EPA limit 60 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019
Highest in the ZIP: 74.6799999999999 µg/L — HALLSDALE-POWELL U.D. · 84,315 people · 2019 | 3/3 | SYR4 |
| Barium | 28 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019
Highest in the ZIP: 37.86 µg/L — HALLSDALE-POWELL U.D. · 84,315 people · 2014 | 3/3 | SYR4 |
| Copper | 12.6 µg/L 1% of the EPA limit 1300 µg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.995 pCi/L 20% of the EPA limit 15 pCi/L Highest in the ZIP: LUTTRELL-BLAINE-CORRYTON U.D. · 10,529 people · 2018 | 2/3 | SYR4 |
| Arsenic | 1.5 µg/L 15% of the EPA limit 10 µg/L Highest in the ZIP: LUTTRELL-BLAINE-CORRYTON U.D. · 10,529 people · 2014 | 2/3 | SYR4 |
| Selenium | 0.3790 µg/L 0.8% of the EPA limit 50 µg/L Highest in the ZIP: HALLSDALE-POWELL U.D. · 84,315 people · 2014 | 1/3 | SYR4 |
| Pfba | 0.0061 µg/L No EPA limit set Highest in the ZIP: LUTTRELL-BLAINE-CORRYTON U.D. · 10,529 people · 2024 | 1/3 | UCMR-5 |
| PFBS | 0.0037 µg/L No EPA limit set Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.00060 mg/L 4% of the EPA limit 0.0150 mg/L Main supplier: KNOXVILLE UTILITIES BOARD - KUB · 254,671 people · 2025
Highest in the ZIP: 0.0010 mg/L — HALLSDALE-POWELL U.D. · 84,315 people · 2025 | 3/3 | 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 37921
| Supplier | State | Population served |
|---|---|---|
| KNOXVILLE UTILITIES BOARD - KUB | TN | 254,671 |
| HALLSDALE-POWELL U.D. | TN | 84,315 |
| LUTTRELL-BLAINE-CORRYTON U.D. | TN | 10,529 |
Frequently asked questions about ZIP 37921 tap water
Is the tap water in ZIP 37921 safe to drink?
EPA testing detected 13 contaminants across the water suppliers serving ZIP 37921. 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 37921?
3 public water suppliers report EPA drinking-water monitoring for ZIP 37921. Each is listed above with its population served.
What contaminants are in ZIP 37921's water?
EPA monitoring detected Nitrate, Fluoride, Nitrate-Nitrite, TTHM, Total Haloacetic Acids (HAA5), and others across this ZIP's suppliers. The full list with levels and sources is above.