What was found in Dighton'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 | 460 µg/L 4.6% of the EPA limit 10000 µg/L Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2019
Highest in the city: 1190 µg/L — DIGHTON WATER DISTRICT · 5,280 people · 2019 | 2/3 | SYR4 |
| Copper | 669 µg/L 51% of the EPA limit 1300 µg/L Highest in the city: DIGHTON WATER DISTRICT · 5,280 people · 2019 | 1/3 | SYR4 |
| TTHM | 124.5 µg/L 156% of the EPA limit, at the 95th percentile of samples — 80 µg/L Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2018 | 3/3 | SYR4 |
| Chloroform | 9.5405 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2016
Highest in the city: 72.36 µg/L — DIGHTON WATER DISTRICT · 5,280 people · 2019 | 3/3 | SYR4 |
| Total Haloacetic Acids (HAA5) | 26.04 µg/L 43% of the EPA limit 60 µg/L Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2018
Highest in the city: 50.51 µg/L — NORTH DIGHTON FIRE DISTRICT · 1,300 people · 2019 | 3/3 | SYR4 |
| Dibromochloromethane | 50.36 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2016 | 3/3 | SYR4 |
| Bromoform | 49.755 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2016 | 2/3 | SYR4 |
| Dibromoacetic Acid | 26.245 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2018 | 3/3 | SYR4 |
| Dichloroacetic Acid | 6.63 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2015
Highest in the city: 25.765 µg/L — NORTH DIGHTON FIRE DISTRICT · 1,300 people · 2019 | 3/3 | SYR4 |
| Trichloroacetic Acid | 24.95 µg/L No EPA limit set Highest in the city: DIGHTON WATER DISTRICT · 5,280 people · 2019 | 2/3 | SYR4 |
| Bromodichloromethane | 24.4185 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2016 | 3/3 | SYR4 |
| Barium | 5.985 µg/L 0.3% of the EPA limit 2000 µg/L Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2019 | 1/3 | SYR4 |
| Monochloroacetic Acid | 1.05 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2015
Highest in the city: 4.382 µg/L — NORTH DIGHTON FIRE DISTRICT · 1,300 people · 2019 | 3/3 | SYR4 |
| Selenium | 2 µg/L 4% of the EPA limit 50 µg/L Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2019 | 1/3 | SYR4 |
| Monobromoacetic Acid | 1.25 µg/L No EPA limit set Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2015
Highest in the city: 1.85 µg/L — NORTH DIGHTON FIRE DISTRICT · 1,300 people · 2019 | 2/3 | SYR4 |
| Arsenic | 1 µg/L 10% of the EPA limit 10 µg/L Main supplier: INIMA USA / AQUARIA LLC · 105,643 people · 2019 | 1/3 | SYR4 |
| PFOA | 0.0055 µg/L No EPA limit set Highest in the city: DIGHTON WATER DISTRICT · 5,280 people · 2024 | 1/3 | UCMR-5 |
| PFOS | 0.0041 µg/L No EPA limit set Highest in the city: DIGHTON WATER DISTRICT · 5,280 people · 2024 | 1/3 | UCMR-5 |
| Pfhxa | 0.0035 µg/L No EPA limit set Highest in the city: DIGHTON WATER DISTRICT · 5,280 people · 2024 | 1/3 | UCMR-5 |
| Pfpea | 0.0034 µg/L No EPA limit set Highest in the city: DIGHTON WATER DISTRICT · 5,280 people · 2024 | 1/3 | UCMR-5 |
| Lead | 0.0030 mg/L 20% of the EPA limit 0.0150 mg/L Highest in the city: NORTH DIGHTON FIRE DISTRICT · 1,300 people · 2023 | 2/3 | 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.
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 Dighton
| Supplier | Population served |
|---|---|
| INIMA USA / AQUARIA LLC | 105,643 |
| DIGHTON WATER DISTRICT | 5,280 |
| NORTH DIGHTON FIRE DISTRICT | 1,300 |
Frequently asked questions about Dighton tap water
Is Dighton tap water safe to drink?
EPA testing detected 21 contaminants in the water serving Dighton. 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 Dighton?
3 public water suppliers report drinking-water monitoring for Dighton, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Dighton's water?
The contaminants EPA monitoring detected in Dighton include Nitrate, Copper, TTHM, Chloroform, Total Haloacetic Acids (HAA5). 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.