EWG's Tap Water Database — 2021 UPDATE


Nitrate and nitrite

Takotna Water System

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.





Samples exceeding legal limit (MCL)


Samples exceeding
health guidelines

Testing results - average by year

YearAverage resultSamples takenDetectionsRange of results
20150.259 ppm110.259 ppm
20160.223 ppm110.223 ppm
20170.579 ppm110.579 ppm
20180.828 ppm110.828 ppm
20191.84 ppm111.84 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
2015-06-15IN*A1506270-01A0.259 ppm
2016-04-17IN*A1604256-01A0.223 ppm
2017-05-25IN*A1705349-01A0.579 ppm
2018-07-09IN*A1807082-01A0.828 ppm
2019-05-21ARS3-19-01523-001.84 ppm