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Tap water quality report

Falmouth, MA

EPA monitoring detected 19 contaminants across the 2 water suppliers serving Falmouth. 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
103,551
people served
19
contaminants found
Massachusetts rankings Lead in Massachusetts PFAS in Massachusetts

What was found in Falmouth'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
1476 µg/L 15%
of the EPA limit 10000 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
Highest in the city: 1920 µg/L — OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2019
2/2 SYR4
Fluoride
1127.5 µg/L 28%
of the EPA limit 4000 µg/L
Highest in the city: OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2018
1/2 SYR4
TTHM
85.04 µg/L 106%
of the EPA limit, at the 95th percentile of samples — 80 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Copper
81.8 µg/L 6.3%
of the EPA limit 1300 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2018
2/2 SYR4
Chloroform
63.915 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Total Haloacetic Acids (HAA5)
55.065 µg/L 92%
of the EPA limit 60 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Barium
39.2 µg/L 2%
of the EPA limit 2000 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Dichloroacetic Acid
23.68 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Trichloroacetic Acid
23 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Bromodichloromethane
18.4 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Dibromochloromethane
7.85 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
Highest in the city: 8.9245 µg/L — OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2019
2/2 SYR4
Monochloroacetic Acid
4.3325 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
2/2 SYR4
Tetrachloroethylene
4.179 µg/L 84%
of the EPA limit 5 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
1/2 SYR4
Monobromoacetic Acid
3.5355 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
1/2 SYR4
Bromoform
1.855 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
Highest in the city: 3.084 µg/L — OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2019
2/2 SYR4
Dibromoacetic Acid
1.861 µg/L
No EPA limit set
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
Highest in the city: 2.104 µg/L — OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2019
2/2 SYR4
Antimony, Total
2 µg/L 33%
of the EPA limit 6 µg/L
Highest in the city: OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2018
1/2 SYR4
Bromate
1.6 µg/L 16%
of the EPA limit 10 µg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2019
1/2 SYR4
Lead
0.0011 mg/L 7.3%
of the EPA limit 0.0150 mg/L
Main supplier: FALMOUTH WATER DEPT · 97,551 people · 2025
Highest in the city: 0.0015 mg/L — OTIS AIR NATIONAL GUARD BASE · 6,000 people · 2024
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 Falmouth

SupplierPopulation served
FALMOUTH WATER DEPT 97,551
OTIS AIR NATIONAL GUARD BASE 6,000

Frequently asked questions about Falmouth tap water

Is Falmouth tap water safe to drink?

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

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

What contaminants are in Falmouth's water?

The contaminants EPA monitoring detected in Falmouth include Nitrate, Fluoride, TTHM, Copper, 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.