What was found in ZIP 03870
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 | 3600 µg/L 36% of the EPA limit 10000 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 6950 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 3/3 | SYR4 |
| Nitrate-Nitrite | 6780 µg/L 68% of the EPA limit 10000 µg/L Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2016 | 2/3 | SYR4 |
| Copper | 721 µg/L 55% of the EPA limit 1300 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 885.5 µg/L — RYE WATER DIST · 4,300 people · 2019 | 3/3 | SYR4 |
| Fluoride | 185 µg/L 4.6% of the EPA limit 4000 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 554 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 3/3 | SYR4 |
| Lead | 190 µg/L 1267% of the EPA limit, at the 95th percentile of samples — 15 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2017 | 3/3 | SYR4 |
| TTHM | 25.6 µg/L 32% of the EPA limit 80 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 98 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/3 | SYR4 |
| Chloroform | 2.695 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 84.4 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 4.74 µg/L 7.9% of the EPA limit 60 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 65.3 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/3 | SYR4 |
| Trichloroacetic Acid | 40.5742 µg/L No EPA limit set Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 1/3 | SYR4 |
| Barium | 35.8 µg/L 1.8% of the EPA limit 2000 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 40.15 µg/L — RYE WATER DIST · 4,300 people · 2019 | 3/3 | SYR4 |
| Lithium | 24.9 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2024 | 2/3 | UCMR-5 |
| Dichloroacetic Acid | 1.585 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 23 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 6.475 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 13 µg/L — PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 2/3 | SYR4 |
| Dibromochloromethane | 10.15 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 2/3 | SYR4 |
| Monochloroacetic Acid | 9.68415 µg/L No EPA limit set Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 1/3 | SYR4 |
| Chromium | 9.01 µg/L 9% of the EPA limit 100 µg/L Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2019 | 1/3 | SYR4 |
| Bromoform | 4.83 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 1/3 | SYR4 |
| Arsenic | 4 µg/L 40% of the EPA limit 10 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 3/3 | SYR4 |
| Dibromoacetic Acid | 3.48 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 1/3 | SYR4 |
| Gross Alpha, Excl. Radon And U | 2.18 pCi/L 15% of the EPA limit 15 pCi/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 2/3 | SYR4 |
| Combined Uranium | 2.16 µg/L 7.2% of the EPA limit 30 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 2/3 | SYR4 |
| Combined Radium (-226 And -228) | 1.75 pCi/L 35% of the EPA limit 5 pCi/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019
Highest in the ZIP: 1.998 pCi/L — PORTSMOUTH WATER WORKS · 33,000 people · 2018 | 3/3 | SYR4 |
| Selenium | 1.1 µg/L 2.2% of the EPA limit 50 µg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2019 | 1/3 | SYR4 |
| Pfpea | 0.0251 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2024 | 3/3 | UCMR-5 |
| Pfhxa | 0.0101 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2024 | 3/3 | UCMR-5 |
| PFBS | 0.0090 µg/L No EPA limit set Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/3 | UCMR-5 |
| PFOA | 0.0047 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2024
Highest in the ZIP: 0.0083 µg/L — RYE WATER DIST · 4,300 people · 2025 | 3/3 | UCMR-5 |
| PFOS | 0.0045 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2024
Highest in the ZIP: 0.0078 µg/L — RYE WATER DIST · 4,300 people · 2025 | 3/3 | UCMR-5 |
| Pfba | 0.0050 µg/L No EPA limit set Main supplier: AQUARION WATER/NH · 34,000 people · 2024 | 2/3 | UCMR-5 |
| PFHXS | 0.0050 µg/L No EPA limit set Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/3 | UCMR-5 |
| Pfhpa | 0.0030 µg/L No EPA limit set Highest in the ZIP: PORTSMOUTH WATER WORKS · 33,000 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: AQUARION WATER/NH · 34,000 people · 2024 | 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 03870
| Supplier | State | Population served |
|---|---|---|
| AQUARION WATER/NH | CT | 34,000 |
| PORTSMOUTH WATER WORKS | NH | 33,000 |
| RYE WATER DIST | NH | 4,300 |
Frequently asked questions about ZIP 03870 tap water
Is the tap water in ZIP 03870 safe to drink?
EPA testing detected 32 contaminants across the water suppliers serving ZIP 03870. 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 03870?
3 public water suppliers report EPA drinking-water monitoring for ZIP 03870. Each is listed above with its population served.
What contaminants are in ZIP 03870's water?
EPA monitoring detected Nitrate, Nitrate-Nitrite, Copper, Fluoride, Lead, and others across this ZIP's suppliers. The full list with levels and sources is above.