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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Harrisville W/a

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

 

30

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND50ND
2015ND50ND
2016ND50ND
2017ND40ND
2018ND70ND
2019ND40ND

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
2014-05-21140522-048NIND
2014-05-21140522-047NIND
2014-05-21140522-046NIND
2014-05-21140522-045NIND
2014-05-21140522-044NIND
2015-05-11150512-039NIND
2015-05-11150512-038NIND
2015-05-11150512-035NIND
2015-05-11150512-034NIND
2015-05-11150512-033NIND
2016-05-23160524-001NIND
2016-05-23160524-005NIND
2016-05-23160524-004NIND
2016-05-23160524-003NIND
2016-05-23160524-002NIND
2017-03-27170328-123NIND
2017-03-27170328-061NIND
2017-03-27170328-056NIND
2017-03-27170328-030NIND
2018-02-12180213-025NIND
2018-04-02180403-111NIND
2018-04-02180403-110NIND
2018-04-02180403-109NIND
2018-04-02180403-108NIND
2018-06-11180612-002NIND
2018-08-06180807-002NIND
2019-03-19190320-008NIND
2019-03-19190320-041NIND
2019-03-19190320-014NIND
2019-03-19190320-010NIND