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Drinking Water

Annual Water Quality Reports (AWQR)

Larchmont Water department regularly tests and inspects the quality of water under the direction of the Westchester County Department of Health.  Water quality reports are published annually based on these tests and inspections.

2022 AWQR
2021 AWQR

Where does our water come from?In general, the sources of drinking water (both tap water and bottled water) include rivers, lakes, streams, ponds, reservoirs, springs, and wells. As water travels over the surface of the land or through the ground, it dissolves naturally occurring minerals and, in some cases, radioactive material, and can pick up substances resulting from the presence of animals or from human activities. Contaminants that may be present in source water include microbial contaminants; inorganic contaminants; pesticides and herbicides; organic chemical contaminants; and radioactive contaminants. In order to ensure that tap water is safe to drink, the State and the EPA prescribe regulations which limit the amount of certain contaminants in water provided by public water systems. The State Health Department’s and the FDA’s regulations establish limits for contaminants in bottled water which must provide the same protection for public health.

Our water supply is a blend of the Catskill and Delaware watersheds of the New York City water system obtained through a connection at Shaft 22 of the Delaware Aqueduct in Yonkers and delivered to Larchmont via the Westchester Joint Water Works Larchmont Pump Station. During 2021 our water system did not experience any restrictions of our water source.


How is our water treated?Shaft 22 water is fluoridated and chlorinated at the Kensico Reservoir and goes through UV treatment at the New York City UV Plant at Grasslands. Westchester Joint Water Works (WJWW) provides additional chlorination at its Larchmont Station. In addition, caustic soda is added to increase PH and blended poly-orthophosphate is added as a corrosion inhibitor at that point.

Although surface waters in general are highly sensitive to microbial contaminants, NYSDOH's assessment found no noteworthy risks to water quality. 


Are there contaminants in our drinking water? 

As the State regulations require, we routinely test your drinking water for numerous contaminants. These contaminants include: total coliform, turbidity, inorganic compounds, nitrate, nitrite, lead and copper, volatile organic compounds, total trihalomethanes and synthetic organic compounds.

All drinking water, including bottled water, may reasonably be expected to contain at least small amounts of some contaminants. The presence of contaminants does not necessarily indicate that water poses a health risk. More information about contaminant and potential health effects can be obtained by calling the EPA's Safe Drinking Water Hotline (1-800-426-4791) or the Westchester County Health Department at 914-813-5000.