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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Boone County PWSD 9

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

 

30

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
2014ND50ND
20150.00880 ppm52ND - 0.0300 ppm
20160.00240 ppm51ND - 0.0120 ppm
2017ND50ND
2018ND50ND
2019ND50ND

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
2014-02-25AC18635ND
2014-02-25AC18636ND
2014-02-25AC18637ND
2014-02-25AC18638ND
2014-02-25AC18634ND
2015-02-18AC42205ND
2015-02-18AC422090.0140 ppm
2015-02-18AC42207ND
2015-02-18AC422080.0300 ppm
2015-02-18AC42206ND
2016-02-04AC66647ND
2016-02-04AC666440.0120 ppm
2016-02-04AC66648ND
2016-02-04AC66646ND
2016-02-04AC66645ND
2017-02-17AC91089ND
2017-02-17AC91092ND
2017-02-17AC91090ND
2017-02-17AC91088ND
2017-02-17AC91091ND
2018-02-22AD14478ND
2018-02-22AD14479ND
2018-02-22AD14480ND
2018-02-22AD14481ND
2018-02-22AD14482ND
2019-02-25AD39653ND
2019-02-25AD39654ND
2019-02-25AD39655ND
2019-02-25AD39656ND
2019-02-25AD39657ND