What was found in Grafton'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 | 3350 µg/L 34% of the EPA limit 10000 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 4/4 | SYR4 |
| Fluoride | 1495 µg/L 37% of the EPA limit 4000 µg/L Highest in the city: LAUREL HILL CONDOMINIUMS · 64 people · 2017 | 2/4 | SYR4 |
| Copper | 397 µg/L 31% of the EPA limit 1300 µg/L Highest in the city: SOUTH GRAFTON WATER DISTRICT · 3,262 people · 2016 | 1/4 | SYR4 |
| Barium | 156.45 µg/L 7.8% of the EPA limit 2000 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| TTHM | 63.925 µg/L 80% of the EPA limit 80 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| Chloroform | 30.405 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| Total Haloacetic Acids (HAA5) | 27 µg/L 45% of the EPA limit 60 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| 1,1,1-Trichloroethane | 26 µg/L 13% of the EPA limit 200 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Bromodichloromethane | 22.055 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| cis-1,2-Dichloroethylene | 19.28 µg/L 28% of the EPA limit 70 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Dibromochloromethane | 17 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| Trichloroacetic Acid | 12.45 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Trichloroethylene | 10.84 µg/L 217% of the EPA limit, at the 95th percentile of samples — 5 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Dichloroacetic Acid | 9.056 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Arsenic | 7.48 µg/L 75% of the EPA limit 10 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Monochloroacetic Acid | 4.89 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Dibromoacetic Acid | 4.42 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Bromoform | 3.2845 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 2/4 | SYR4 |
| Lead | 2.81 µg/L 19% of the EPA limit 15 µg/L Highest in the city: SOUTH GRAFTON WATER DISTRICT · 3,262 people · 2016 | 1/4 | SYR4 |
| 1,1-Dichloroethylene | 2.041 µg/L 29% of the EPA limit 7 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Monobromoacetic Acid | 1.31 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Tetrachloroethylene | 1.0125 µg/L 20% of the EPA limit 5 µg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2019 | 1/4 | SYR4 |
| Lead | 0.0083 mg/L 55% of the EPA limit 0.0150 mg/L Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2025 | 4/4 | LCR |
| PFOA | 0.0069 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2025 | 1/4 | UCMR-5 |
| PFOS | 0.0069 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2025 | 1/4 | UCMR-5 |
| Pfhxa | 0.0036 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2025 | 1/4 | UCMR-5 |
| Pfpea | 0.0035 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2025 | 1/4 | UCMR-5 |
| PFBS | 0.0031 µg/L No EPA limit set Main supplier: GRAFTON WATER DISTRICT · 10,925 people · 2025 | 1/4 | UCMR-5 |
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 Grafton
| Supplier | Population served |
|---|---|
| GRAFTON WATER DISTRICT | 10,925 |
| SOUTH GRAFTON WATER DISTRICT | 3,262 |
| LAUREL HILL CONDOMINIUMS | 64 |
| COUNTRYSIDE CONDOMINIUM | 30 |
Frequently asked questions about Grafton tap water
Is Grafton tap water safe to drink?
EPA testing detected 28 contaminants in the water serving Grafton. 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 Grafton?
4 public water suppliers report drinking-water monitoring for Grafton, Massachusetts to the EPA. Each is listed above with its population served.
What contaminants are in Grafton's water?
The contaminants EPA monitoring detected in Grafton include Nitrate, Fluoride, Copper, Barium, TTHM. 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.