Is Weymouth, MA Tap Water Safe? Quality & Contaminants

What was found in Weymouth'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
Fluoride	968 µg/L 24% of the EPA limit 4000 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	1/2	SYR4
Nitrate	709.4 µg/L 7.1% of the EPA limit 10000 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	1/2	SYR4
TTHM	77.787 µg/L 97% of the EPA limit 80 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Chloroform	49.45 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Barium	27.2 µg/L 1.4% of the EPA limit 2000 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	1/2	SYR4
Total Haloacetic Acids (HAA5)	24 µg/L 40% of the EPA limit 60 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Bromodichloromethane	22.25 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Trichloroacetic Acid	14.53 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Dichloroacetic Acid	9.07 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019 Highest in the city: 10.88 µg/L — SOUTHFIELD REDEVELOPEMENT AUTHORITY · 2,300 people · 2019	2/2	SYR4
Dibromochloromethane	9.3955 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Monobromoacetic Acid	5.74 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Monochloroacetic Acid	3.52 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Selenium	3 µg/L 6% of the EPA limit 50 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	1/2	SYR4
Dibromoacetic Acid	2.284 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Chromium	1.6 µg/L 1.6% of the EPA limit 100 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	1/2	SYR4
Bromoform	1.195 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	2/2	SYR4
Arsenic	1 µg/L 10% of the EPA limit 10 µg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2019	1/2	SYR4
Pfpea	0.0031 µg/L No EPA limit set Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 people · 2025	1/2	UCMR-5
Lead	0.0010 mg/L 6.7% of the EPA limit 0.0150 mg/L Main supplier: WEYMOUTH WATER DEPARTMENT · 57,871 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 Weymouth

Supplier	Population served
WEYMOUTH WATER DEPARTMENT	57,871
SOUTHFIELD REDEVELOPEMENT AUTHORITY	2,300

Frequently asked questions about Weymouth tap water

Is Weymouth tap water safe to drink?

EPA testing detected 19 contaminants in the water serving Weymouth. 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 Weymouth?

2 public water suppliers report drinking-water monitoring for Weymouth, Massachusetts to the EPA. Each is listed above with its population served.

What contaminants are in Weymouth's water?

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