EWG's Tap Water Database — 2021 UPDATE


Nitrate and nitrite

Westchester County WD #2

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20140.340 ppm110.340 ppm
20150.0500 ppm110.0500 ppm
20160.300 ppm110.300 ppm
20170.150 ppm110.150 ppm
20180.310 ppm110.310 ppm
20190.460 ppm110.460 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The health guideline of 0.14 parts per million, or ppm, for nitrate and nitrite is based on the equivalent health guideline for nitrate, as defined in a peer-reviewed scientific study by EWG. This guideline represents a one-in-one-million annual cancer risk level.

EPA Maximum Contaminant
Level (MCL) 10 ppm

ppm = parts per million

All test results

Date Lab ID Result
2014-05-131405A34-001 N0.340 ppm
2015-11-09S002803-02 N0.0500 ppm
2016-05-11S007231-04 N0.300 ppm
2017-05-11S018299-01 N0.150 ppm
2018-05-117051461001 NIT0.310 ppm
2019-05-297091340001 NIT0.460 ppm