Is Medway, MA Tap Water Safe? Quality & Contaminants

What was found in Medway'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	2670 µg/L 27% of the EPA limit 10000 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Fluoride	1063.5 µg/L 27% of the EPA limit 4000 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2018	1/1	SYR4
Barium	370.45 µg/L 19% of the EPA limit 2000 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2018	1/1	SYR4
TTHM	43.605 µg/L 55% of the EPA limit 80 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Chloroform	17 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Dibromochloromethane	16 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Total Haloacetic Acids (HAA5)	15.87 µg/L 26% of the EPA limit 60 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Bromodichloromethane	14.05 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Trichloroacetic Acid	10.395 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Monochloroacetic Acid	7.7 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Bromoform	6.85 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Dichloroacetic Acid	5.46 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Dibromoacetic Acid	4.035 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Selenium	4 µg/L 8% of the EPA limit 50 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2018	1/1	SYR4
Monobromoacetic Acid	3.56 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
Arsenic	2 µg/L 20% of the EPA limit 10 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2018	1/1	SYR4
Tetrachloroethylene	0.6000 µg/L 12% of the EPA limit 5 µg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2019	1/1	SYR4
PFOA	0.0072 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2025	1/1	UCMR-5
Pfpea	0.0038 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2025	1/1	UCMR-5
Pfhxa	0.0031 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2025	1/1	UCMR-5
PFBS	0.0030 µg/L No EPA limit set Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2025	1/1	UCMR-5
Lead	0.0 mg/L 0% of the EPA limit 0.0150 mg/L Main supplier: MEDWAY WATER DEPARTMENT · 14,176 people · 2025	1/1	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 Medway

Supplier	Population served
MEDWAY WATER DEPARTMENT	14,176

Frequently asked questions about Medway tap water

Is Medway tap water safe to drink?

EPA testing detected 22 contaminants in the water serving Medway. 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 Medway?

1 public water supplier report drinking-water monitoring for Medway, Massachusetts to the EPA. Each is listed above with its population served.

What contaminants are in Medway's water?

The contaminants EPA monitoring detected in Medway include Nitrate, Fluoride, Barium, TTHM, Chloroform. 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.