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EWG's Tap Water Database — 2019 UPDATE

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Nitrate and nitrite

Ward Nine 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.

 

22

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND20ND
2013ND60ND
2014ND20ND
20150.0370 ppm220.0370 ppm
2016ND60ND
20170.0180 ppm42ND - 0.0360 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
2012-01-26AD63537ND
2012-01-26AD63537ND
2013-08-28AD83607ND
2013-08-28AD83607ND
2013-12-02AD87355ND
2013-12-02AD87360ND
2013-12-02AD87360ND
2013-12-02AD87355ND
2014-02-18AD89185ND
2014-02-18AD89185ND
2015-09-01352056340030.0370 ppm
2015-09-01352056340030.0370 ppm
2016-11-1635278134007ND
2016-11-1635278134007ND
2016-12-1935284500007ND
2016-12-1935284500007ND
2016-12-1935284500006ND
2016-12-1935284500006ND
2017-05-23353146480090.0360 ppm
2017-05-23353146480090.0360 ppm
2017-11-2235360163001ND
2017-11-2235360163001ND