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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Southwest Ouachita Waterworks Inc.

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

 

88

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND140ND
20150.0187 ppm2212ND - 0.0390 ppm
20160.0163 ppm148ND - 0.0340 ppm
2017ND140ND
20180.00814 ppm144ND - 0.0290 ppm
2019ND100ND

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
2014-06-16AD92405ND
2014-06-16AD92400ND
2014-06-16AD92405ND
2014-06-16AD92400ND
2014-10-20AD98764ND
2014-10-20AD98759ND
2014-10-20AD98769ND
2014-10-20AD98774ND
2014-10-20AD98784ND
2014-10-20AD98784ND
2014-10-20AD98774ND
2014-10-20AD98769ND
2014-10-20AD98764ND
2014-10-20AD98759ND
2015-01-05AE00850ND
2015-01-05AE00850ND
2015-06-1535193582010ND
2015-06-1535193582009ND
2015-06-1535193582008ND
2015-06-1535193582007ND
2015-06-1535193582010ND
2015-06-1535193582009ND
2015-06-1535193582008ND
2015-06-1535193582007ND
2015-12-16352224210060.0390 ppm
2015-12-16352224210010.0300 ppm
2015-12-16352224210020.0310 ppm
2015-12-16352224210030.0360 ppm
2015-12-16352224210040.0320 ppm
2015-12-16352224210050.0380 ppm
2015-12-16352224210060.0390 ppm
2015-12-16352224210050.0380 ppm
2015-12-16352224210040.0320 ppm
2015-12-16352224210030.0360 ppm
2015-12-16352224210020.0310 ppm
2015-12-16352224210010.0300 ppm
2016-11-0435276392004ND
2016-11-04352763920060.0280 ppm
2016-11-04352763920050.0340 ppm
2016-11-04352763920050.0340 ppm
2016-11-04352763920010.0260 ppm
2016-11-04352763920030.0260 ppm
2016-11-0435276392002ND
2016-11-04352763920060.0280 ppm
2016-11-0435276392004ND
2016-11-04352763920010.0260 ppm
2016-11-0435276392002ND
2016-11-04352763920030.0260 ppm
2016-12-1535284709024ND
2016-12-1535284709024ND
2017-06-1235318592001ND
2017-06-1235318592003ND
2017-06-1235318592002ND
2017-06-1235318592001ND
2017-06-1235318592003ND
2017-06-1235318592002ND
2017-10-1635343270002ND
2017-10-1635343270003ND
2017-10-1635343270001ND
2017-10-1635343270002ND
2017-10-1635343270003ND
2017-10-1635343270004ND
2017-10-1635343270001ND
2017-10-1635343270004ND
2018-11-0935431621004ND
2018-11-09354316210070.0290 ppm
2018-11-09354316210060.0280 ppm
2018-11-0935431621005ND
2018-11-0935431621003ND
2018-11-0935431621002ND
2018-11-0935431621001ND
2018-11-0935431621001ND
2018-11-0935431621002ND
2018-11-0935431621003ND
2018-11-0935431621004ND
2018-11-0935431621005ND
2018-11-09354316210060.0280 ppm
2018-11-09354316210070.0290 ppm
2019-10-0835504088001ND
2019-10-0835504088002ND
2019-10-0835504088001ND
2019-10-0835504088002ND
2019-12-0635518123001ND
2019-12-0635518123003ND
2019-12-0635518123002ND
2019-12-0635518123001ND
2019-12-0635518123003ND
2019-12-0635518123002ND