What was found in ZIP 37221
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 | 738.1999999999998 µg/L 18% of the EPA limit 4000 µg/L Main supplier: METRO WATER SERVICES · 778,153 people · 2019 | 2/2 | SYR4 |
| Nitrate | 520.1999999999999 µg/L 5.2% of the EPA limit 10000 µg/L Main supplier: METRO WATER SERVICES · 778,153 people · 2019 | 2/2 | SYR4 |
| TTHM | 59.959999999999994 µg/L 75% of the EPA limit 80 µg/L Main supplier: METRO WATER SERVICES · 778,153 people · 2019
Highest in the ZIP: 62.8 µg/L — HARPETH VALLEY U.D. · 65,518 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 56.964999999999996 µg/L 95% of the EPA limit 60 µg/L Main supplier: METRO WATER SERVICES · 778,153 people · 2019 | 2/2 | SYR4 |
| Barium | 19.9 µg/L 1% of the EPA limit 2000 µg/L Highest in the ZIP: HARPETH VALLEY U.D. · 65,518 people · 2018 | 1/2 | SYR4 |
| Chlorobenzene | 1.6219999999999999 µg/L 1.6% of the EPA limit 100 µg/L Highest in the ZIP: HARPETH VALLEY U.D. · 65,518 people · 2018 | 1/2 | SYR4 |
| 2,4-D | 0.1933 µg/L 0.3% of the EPA limit 70 µg/L Main supplier: METRO WATER SERVICES · 778,153 people · 2019 | 1/2 | SYR4 |
| Lead | 0.00080 mg/L 5.3% of the EPA limit 0.0150 mg/L Main supplier: METRO WATER SERVICES · 778,153 people · 2025
Highest in the ZIP: 0.0047 mg/L — HARPETH VALLEY U.D. · 65,518 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 37221
| Supplier | State | Population served |
|---|---|---|
| METRO WATER SERVICES | 778,153 | |
| HARPETH VALLEY U.D. | TN | 65,518 |
Frequently asked questions about ZIP 37221 tap water
Is the tap water in ZIP 37221 safe to drink?
EPA testing detected 8 contaminants across the water suppliers serving ZIP 37221. 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 37221?
2 public water suppliers report EPA drinking-water monitoring for ZIP 37221. Each is listed above with its population served.
What contaminants are in ZIP 37221's water?
EPA monitoring detected Fluoride, Nitrate, TTHM, Total Haloacetic Acids (HAA5), Barium, and others across this ZIP's suppliers. The full list with levels and sources is above.