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Tap water quality report

Larchmont, NY

EPA monitoring detected 9 contaminants across the 1 water supplier serving Larchmont. 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.

1
water supplier
6,485
people served
9
contaminants found
New York rankings Lead in New York PFAS in New York

What was found in Larchmont'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
TTHM
42.09 µg/L 53%
of the EPA limit 80 µg/L
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Chloroform
37.41 µg/L
No EPA limit set
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Total Haloacetic Acids (HAA5)
32.75 µg/L 55%
of the EPA limit 60 µg/L
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Trichloroacetic Acid
21.5 µg/L
No EPA limit set
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Dichloroacetic Acid
12.725 µg/L
No EPA limit set
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Bromodichloromethane
4.26 µg/L
No EPA limit set
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Monochloroacetic Acid
1.309 µg/L
No EPA limit set
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Dibromochloromethane
0.3920 µg/L
No EPA limit set
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2019
1/1 SYR4
Lead
0.0049 mg/L 33%
of the EPA limit 0.0150 mg/L
Main supplier: LARCHMONT VILLAGE · 6,485 people · 2026
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 Larchmont

SupplierPopulation served
LARCHMONT VILLAGE 6,485

Frequently asked questions about Larchmont tap water

Is Larchmont tap water safe to drink?

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

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

What contaminants are in Larchmont's water?

The contaminants EPA monitoring detected in Larchmont include TTHM, Chloroform, Total Haloacetic Acids (HAA5), Trichloroacetic Acid, Dichloroacetic Acid. 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.