Nitrate and nitrite

Yonkers City

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2013	N/A	0	0	N/A
2014	0.256 ppm	4	4	0.230 ppm - 0.281 ppm
2015	N/A	0	0	N/A
2016	0.102 ppm	4	4	0.0940 ppm - 0.119 ppm
2017	0.124 ppm	4	4	0.122 ppm - 0.125 ppm
2018	0.105 ppm	4	4	0.1000 ppm - 0.113 ppm
2019	0.157 ppm	4	4	0.112 ppm - 0.173 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
2014-03-20	14-2779 N	0.234 ppm
2014-03-20	14-2778 N	0.230 ppm
2014-03-20	14-2780 N	0.281 ppm
2014-03-20	14-2781 N	0.279 ppm
2016-06-22	16-8292 N	0.0970 ppm
2016-06-22	16-8291 N	0.119 ppm
2016-06-22	16-8293 N	0.0940 ppm
2016-06-27	16-8485 N	0.0980 ppm
2017-03-07	17-2255-NIT	0.122 ppm
2017-03-07	17-2254-NIT	0.125 ppm
2017-03-07	17-2256-NIT	0.125 ppm
2017-03-07	17-2237-NIT	0.124 ppm
2018-05-15	18-5024-NIT	0.1000 ppm
2018-05-15	18-5027-NIT	0.102 ppm
2018-05-15	18-5003-NIT	0.113 ppm
2018-05-29	18-5551-NIT	0.104 ppm
2019-05-16	19-5074 NIT	0.170 ppm
2019-05-16	19-5075 NIT	0.112 ppm
2019-05-16	19-5076 NIT	0.173 ppm
2019-05-16	19-5073 NIT	0.172 ppm