Is Grafton, MA Tap Water Safe? Quality & Contaminants

What was found in Grafton's water

The highest level seen across the city's suppliers, the EPA limit for each, and where the figure comes from.

Contaminant	Level vs EPA limit	Suppliers	Source
Nitrate	3700 µg/L 37% of the EPA limit 10000 µg/L	4/4	SYR4
Fluoride	1500 µg/L 38% of the EPA limit 4000 µg/L	2/4	SYR4
Copper	429 µg/L 33% of the EPA limit 1300 µg/L	1/4	SYR4
Barium	270 µg/L 14% of the EPA limit 2000 µg/L	2/4	SYR4
TTHM	93 µg/L 116% of the EPA limit, in the worst sample — 80 µg/L	2/4	SYR4
Total Haloacetic Acids (HAA5)	42 µg/L 70% of the EPA limit 60 µg/L	2/4	SYR4
Chloroform	34.5 µg/L No EPA limit set	2/4	SYR4
1,1,1-Trichloroethane	30 µg/L 15% of the EPA limit 200 µg/L	1/4	SYR4
Bromodichloromethane	27.4 µg/L No EPA limit set	2/4	SYR4
Dibromochloromethane	22 µg/L No EPA limit set	2/4	SYR4
cis-1,2-Dichloroethylene	21 µg/L 30% of the EPA limit 70 µg/L	1/4	SYR4
Dichloroacetic Acid	14.1 µg/L No EPA limit set	1/4	SYR4
Trichloroacetic Acid	14 µg/L No EPA limit set	1/4	SYR4
Trichloroethylene	12 µg/L 240% of the EPA limit, in the worst sample — 5 µg/L	1/4	SYR4
Arsenic	7.8 µg/L 78% of the EPA limit 10 µg/L	1/4	SYR4
Monobromoacetic Acid	6.2 µg/L No EPA limit set	1/4	SYR4
Monochloroacetic Acid	6.1 µg/L No EPA limit set	1/4	SYR4
Bromoform	5.2 µg/L No EPA limit set	2/4	SYR4
Dibromoacetic Acid	5.1 µg/L No EPA limit set	1/4	SYR4
Lead	2.9 µg/L 19% of the EPA limit 15 µg/L	1/4	SYR4
1,1-Dichloroethylene	2.3 µg/L 33% of the EPA limit 7 µg/L	1/4	SYR4
Tetrachloroethylene	1.1 µg/L 22% of the EPA limit 5 µg/L	1/4	SYR4
Lead	0.0144 mg/L 96% of the EPA limit 0.0150 mg/L	4/4	LCR
PFOA	0.0069 µg/L No EPA limit set	1/4	UCMR-5
PFOS	0.0069 µg/L No EPA limit set	1/4	UCMR-5
Pfhxa	0.0036 µg/L No EPA limit set	1/4	UCMR-5
Pfpea	0.0035 µg/L No EPA limit set	1/4	UCMR-5
PFBS	0.0031 µg/L No EPA limit set	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 single worst sample on record — 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 highest level found 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.