What was found in ZIP 03801
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 | 6950 µg/L 70% of the EPA limit 10000 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Nitrate-Nitrite | 6780 µg/L 68% of the EPA limit 10000 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2016 | 2/2 | SYR4 |
| Copper | 205.8 µg/L 16% of the EPA limit 1300 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019
Highest in the ZIP: 663.75 µg/L — PEASE TRADE PORT · 9,900 people · 2019 | 2/2 | SYR4 |
| Fluoride | 554 µg/L 14% of the EPA limit 4000 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 1/2 | SYR4 |
| TTHM | 98 µg/L 123% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Chloroform | 84.4 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 65.3 µg/L 109% of the EPA limit, at the 95th percentile of samples — 60 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Lead | 46.9225 µg/L 313% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Trichloroacetic Acid | 40.5742 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Dichloroacetic Acid | 23 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Barium | 20.775 µg/L 1% of the EPA limit 2000 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Bromodichloromethane | 13 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Lithium | 10 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| Monochloroacetic Acid | 9.68415 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Chromium | 9.01 µg/L 9% of the EPA limit 100 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Dibromochloromethane | 2.12 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/2 | SYR4 |
| Combined Radium (-226 And -228) | 1.998 pCi/L 40% of the EPA limit 5 pCi/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2018 | 2/2 | SYR4 |
| Combined Uranium | 1.525 µg/L 5.1% of the EPA limit 30 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 1/2 | SYR4 |
| Arsenic | 1.495 µg/L 15% of the EPA limit 10 µg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 1/2 | SYR4 |
| Gross Alpha, Excl. Radon And U | 1 pCi/L 6.7% of the EPA limit 15 pCi/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2018 | 1/2 | SYR4 |
| Bromoform | 0.7850 µg/L No EPA limit set Highest in the ZIP: PEASE TRADE PORT · 9,900 people · 2019 | 1/2 | SYR4 |
| Pfba | 0.0050 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024
Highest in the ZIP: 0.0151 µg/L — PEASE TRADE PORT · 9,900 people · 2025 | 2/2 | UCMR-5 |
| PFBS | 0.0090 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| PFOA | 0.0070 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| Pfpea | 0.0070 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| Pfhxa | 0.0060 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| PFHXS | 0.0050 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| PFOS | 0.0050 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| Pfhpa | 0.0030 µg/L No EPA limit set Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/2 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 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 03801
| Supplier | State | Population served |
|---|---|---|
| PORTSMOUTH WATER WORKS | NH | 33,000 |
| PEASE TRADE PORT | NH | 9,900 |
Frequently asked questions about ZIP 03801 tap water
Is the tap water in ZIP 03801 safe to drink?
EPA testing detected 30 contaminants across the water suppliers serving ZIP 03801. 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 03801?
2 public water suppliers report EPA drinking-water monitoring for ZIP 03801. Each is listed above with its population served.
What contaminants are in ZIP 03801's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, Fluoride, TTHM, and others across this ZIP's suppliers. The full list with levels and sources is above.