Know Your Environment. Protect Your Health.

Nitrate and nitrite

Old Westbury

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.

 

34

Samples

0

Samples exceeding legal limit (MCL)

34

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.18 ppm550.220 ppm - 2.30 ppm
20191.29 ppm550.270 ppm - 2.50 ppm
20202.26 ppm660.280 ppm - 4.90 ppm
20211.71 ppm660.220 ppm - 4.20 ppm
20221.86 ppm660.260 ppm - 4.30 ppm
20231.73 ppm660.240 ppm - 4.10 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
2018-11-137070939001-PRI1.30 ppm
2018-11-147071093001-PRI1.40 ppm
2018-12-057072928001-PRI0.220 ppm
2018-12-127073711001-PRI0.700 ppm
2018-12-177074138001-PRI2.30 ppm
2019-08-2870103044002-PRI1.20 ppm
2019-08-2870103044001-PRI0.800 ppm
2019-09-0570103873002-PRI0.270 ppm
2019-09-0570103873001-PRI2.50 ppm
2019-09-1770105242001-PRI1.70 ppm
2020-09-0870144945001-PRI4.90 ppm
2020-09-0970145143001-PRI1.60 ppm
2020-09-1470145712001-PRI2.50 ppm
2020-09-1670146108001-PRI0.880 ppm
2020-09-2170146589001-PRI0.280 ppm
2020-09-2370146960001-PRI3.40 ppm
2021-11-1070194292002-PRI0.720 ppm
2021-11-1070194292001-PRI4.20 ppm
2021-11-1670194898002-PRI1.60 ppm
2021-11-1670194898001-PRI2.50 ppm
2021-12-0870197161001-PRI0.220 ppm
2021-12-2270198898001-PRI1.000 ppm
2022-10-26702345960011.90 ppm
2022-11-0270235277001-SEC0.260 ppm
2022-11-1470236636001-PRI2.60 ppm
2022-11-1670237103001-PRI1.30 ppm
2022-11-3070238258001-PRI0.800 ppm
2022-12-2170240933001-PRI4.30 ppm
2023-11-0170276064001-PRI1.80 ppm
2023-11-0170276064002-PRI2.30 ppm
2023-11-0870276911002-PRI1.20 ppm
2023-11-0870276911001-PRI0.720 ppm
2023-11-2970279039001-PRI0.240 ppm
2023-11-2970279039002-PRI4.10 ppm