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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Hecla Water Association-Plant PWS

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.600 ppm110.600 ppm
20130.600 ppm110.600 ppm
20140.560 ppm110.560 ppm
20150.470 ppm110.470 ppm
20160.500 ppm110.500 ppm
20170.580 ppm110.580 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
2012-02-1393001211740.600 ppm
2013-01-2893000855090.600 ppm
2014-01-22A1401765910.560 ppm
2015-02-11A1502629790.470 ppm
2016-01-20A1603636020.500 ppm
2017-02-08A1704610790.580 ppm