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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Foxcroft School

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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0125 ppm41ND - 0.0500 ppm
20150.0525 ppm42ND - 0.130 ppm
20160.0175 ppm41ND - 0.0700 ppm
20170.198 ppm43ND - 0.630 ppm
20180.123 ppm32ND - 0.310 ppm
20190.207 ppm31ND - 0.620 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
2014-01-15E131205517ND
2014-01-15E1312055180.0500 ppm
2014-07-28E140602124ND
2014-07-28E140602121ND
2015-01-13VA010-DCLS0.130 ppm
2015-01-13VA010-DCLS0.0800 ppm
2015-08-03VA010-DCLSND
2015-08-25VA010-DCLSND
2016-02-01E1601008220.0700 ppm
2016-02-01E160100823ND
2016-08-22E160801227ND
2016-08-22E160801228ND
2017-01-18E1612008200.0500 ppm
2017-01-18E1612008210.630 ppm
2017-08-15E1705039110.110 ppm
2017-08-15E170503923ND
2018-03-11E1712034850.310 ppm
2018-03-11E1712034860.0600 ppm
2018-08-27E180600776ND
2019-03-25E181206034ND
2019-03-25E1812060370.620 ppm
2019-07-22E190606982ND