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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Rolla

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

 

105

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND180ND
2015ND180ND
2016ND170ND
2017ND180ND
2018ND170ND
2019ND170ND

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
2014-03-18AC18547ND
2014-03-18AC18548ND
2014-03-18AC18549ND
2014-03-18AC18550ND
2014-03-18AC18551ND
2014-03-18AC18553ND
2014-03-18AC18554ND
2014-03-18AC18555ND
2014-03-18AC18556ND
2014-03-18AC18557ND
2014-03-18AC18558ND
2014-03-18AC18559ND
2014-03-18AC18560ND
2014-03-18AC18561ND
2014-03-18AC18562ND
2014-03-18AC18563ND
2014-03-18AC18564ND
2014-08-25AC35488ND
2015-01-22AC41393ND
2015-01-22AC41394ND
2015-01-22AC41396ND
2015-01-22AC41380ND
2015-01-22AC41381ND
2015-01-22AC41383ND
2015-01-22AC41388ND
2015-01-22AC41389ND
2015-01-22AC41390ND
2015-01-22AC41392ND
2015-01-22AC41379ND
2015-01-22AC41382ND
2015-01-22AC41384ND
2015-01-22AC41385ND
2015-01-22AC41386ND
2015-01-22AC41387ND
2015-01-22AC41391ND
2015-01-22AC41395ND
2016-01-11AC65351ND
2016-01-11AC65350ND
2016-01-11AC65349ND
2016-01-11AC65348ND
2016-01-11AC65346ND
2016-01-11AC65345ND
2016-01-11AC65357ND
2016-01-11AC65355ND
2016-01-11AC65353ND
2016-01-11AC65352ND
2016-01-11AC65347ND
2016-01-11AC65344ND
2016-01-11AC65356ND
2016-01-11AC65341ND
2016-01-11AC65354ND
2016-01-11AC65343ND
2016-01-11AC65340ND
2017-01-17AC89434ND
2017-01-17AC89438ND
2017-01-17AC89433ND
2017-01-17AC89429ND
2017-01-17AC89430ND
2017-01-17AC89439ND
2017-01-17AC89431ND
2017-01-17AC89428ND
2017-01-17AC89436ND
2017-01-17AC89437ND
2017-01-17AC89427ND
2017-01-17AC89422ND
2017-01-17AC89425ND
2017-01-17AC89432ND
2017-01-17AC89435ND
2017-01-17AC89423ND
2017-01-17AC89424ND
2017-01-17AC89426ND
2018-01-24AD11460ND
2018-01-24AD11461ND
2018-01-24AD11462ND
2018-01-24AD11467ND
2018-01-24AD11471ND
2018-01-24AD11472ND
2018-01-24AD11464ND
2018-01-24AD11465ND
2018-01-24AD11466ND
2018-01-24AD11468ND
2018-01-24AD11469ND
2018-01-24AD11470ND
2018-01-24AD11473ND
2018-01-24AD11474ND
2018-01-24AD11475ND
2018-01-24AD11476ND
2018-01-24AD11477ND
2019-01-14AD38017ND
2019-01-14AD38018ND
2019-01-14AD38020ND
2019-01-14AD38022ND
2019-01-14AD38023ND
2019-01-14AD38029ND
2019-01-14AD38030ND
2019-01-14AD38033ND
2019-01-15AD38019ND
2019-01-15AD38021ND
2019-01-15AD38024ND
2019-01-15AD38025ND
2019-01-15AD38026ND
2019-01-15AD38028ND
2019-01-15AD38031ND
2019-01-15AD38032ND
2019-01-15AD38034ND