What was found in Hingham's water
The level at the city's main supplier, the highest level anywhere in the city, the EPA limit for each, and where every figure comes from.
| Contaminant | Level vs EPA limit | Suppliers | Source |
|---|---|---|---|
| Nitrate | 4990 µg/L 50% of the EPA limit 10000 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Fluoride | 1000 µg/L 25% of the EPA limit 4000 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Copper | 553 µg/L 43% of the EPA limit 1300 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2016 | 1/2 | SYR4 |
| Nitrite | 182.5 µg/L 18% of the EPA limit 1000 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Barium | 94.6 µg/L 4.7% of the EPA limit 2000 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| TTHM | 88 µg/L 110% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Total Haloacetic Acids (HAA5) | 50.7 µg/L 85% of the EPA limit 60 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Chloroform | 46 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Trichloroacetic Acid | 26.37 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Bromodichloromethane | 21 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Dichloroacetic Acid | 16.9 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Lead | 8.4 µg/L 56% of the EPA limit 15 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2016 | 1/2 | SYR4 |
| Dibromochloromethane | 8.185 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Chromium | 5.3 µg/L 5.3% of the EPA limit 100 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Monochloroacetic Acid | 4.6285 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Monobromoacetic Acid | 4.61 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Dibromoacetic Acid | 1.9 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| Combined Uranium | 1.4 µg/L 4.7% of the EPA limit 30 µg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2014 | 1/2 | SYR4 |
| Bromoform | 1.04 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2019 | 1/2 | SYR4 |
| PFOA | 0.0064 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2025 | 1/2 | UCMR-5 |
| Pfhxa | 0.0060 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2025 | 1/2 | UCMR-5 |
| Pfba | 0.0057 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2025 | 1/2 | UCMR-5 |
| Pfpea | 0.0043 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2025 | 1/2 | UCMR-5 |
| PFBS | 0.0033 µg/L No EPA limit set Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2025 | 1/2 | UCMR-5 |
| Lead | 0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: WEIR RIVER WATER SYSTEM · 45,339 people · 2025
Highest in the city: 0.0014 mg/L — LINDEN PONDS · 384 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.
These are the utilities' own EPA-reported results, not a city-wide
average. A detection means the lab measured the
substance — it isn't the same as exceeding a legal limit. Hover a source
tag to see the EPA program and years behind each figure.
Water suppliers serving Hingham
| Supplier | Population served |
|---|---|
| WEIR RIVER WATER SYSTEM | 45,339 |
| LINDEN PONDS | 384 |
Frequently asked questions about Hingham tap water
Is Hingham tap water safe to drink?
EPA testing detected 25 contaminants in the water serving Hingham. A detection isn't the same as a violation — most detected levels are within federal limits. Check the level and source for each contaminant above, and your utility's annual Consumer Confidence Report for the official compliance status.
How many water suppliers serve Hingham?
2 public water suppliers report drinking-water monitoring for Hingham, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Hingham's water?
The contaminants EPA monitoring detected in Hingham include Nitrate, Fluoride, Copper, Nitrite, Barium. The full list, with the level at the main supplier and the data source, is in the table above.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.