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Tap water quality report

Lancaster, MA

EPA monitoring detected 9 contaminants across the 2 water suppliers serving Lancaster. A detection doesn't automatically mean the water is unsafe — see the level at the main supplier for each below, with its EPA source and period.

2
water suppliers
6,120
people served
9
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Lancaster'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.

ContaminantLevel vs EPA limitSuppliersSource
Nitrate
1450 µg/L 14%
of the EPA limit 10000 µg/L
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2019
1/2 SYR4
Copper
1066 µg/L 82%
of the EPA limit 1300 µg/L
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2016
2/2 SYR4
Arsenic
22.5 µg/L 225%
of the EPA limit, at the 95th percentile of samples — 10 µg/L
Highest in the city: LANCASTER WOODS CONDOMINIUMS · 120 people · 2019
1/2 SYR4
Lead
22.2 µg/L 148%
of the EPA limit, at the 95th percentile of samples — 15 µg/L
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2016
1/2 SYR4
TTHM
2.4245 µg/L 3%
of the EPA limit 80 µg/L
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2019
2/2 SYR4
Dibromochloromethane
1.1155 µg/L
No EPA limit set
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2019
2/2 SYR4
Bromoform
0.8955 µg/L
No EPA limit set
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2019
1/2 SYR4
Bromodichloromethane
0.5200 µg/L
No EPA limit set
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2019
1/2 SYR4
Lead
0.0169 mg/L 113%
above the EPA limit of 0.0150 mg/L
Main supplier: LANCASTER WATER DEPARTMENT · 6,000 people · 2026
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 Lancaster

SupplierPopulation served
LANCASTER WATER DEPARTMENT 6,000
LANCASTER WOODS CONDOMINIUMS 120

Frequently asked questions about Lancaster tap water

Is Lancaster tap water safe to drink?

EPA testing detected 9 contaminants in the water serving Lancaster. 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 Lancaster?

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

What contaminants are in Lancaster's water?

The contaminants EPA monitoring detected in Lancaster include Nitrate, Copper, Arsenic, Lead, 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.