Know Your Environment. Protect Your Health.

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.

 

7

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.310 ppm110.310 ppm
20190.460 ppm110.460 ppm
20200.190 ppm110.190 ppm
20210.240 ppm110.240 ppm
20220.190 ppm110.190 ppm
20230.326 ppm220.300 ppm - 0.352 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG 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
2018-05-117051461001 NIT0.310 ppm
2019-05-297091340001 NIT0.460 ppm
2020-05-0870130562 NIT0.190 ppm
2021-06-0470175718001-NIT0.240 ppm
2022-05-1370214739001-NIT0.190 ppm
2023-05-0570255449001-NIT0.300 ppm
2023-07-27AZ13680-NIT0.352 ppm