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EWG's Tap Water Database

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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.

 

26

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20100.0125 ppm41ND - 0.0500 ppm
2011ND40ND
20120.00250 ppm41ND - 0.01000 ppm
2013ND40ND
2014ND50ND
20150.00880 ppm52ND - 0.0300 ppm

ppm = parts per million.

State and national drinking water standards and health guidelines

Health Guideline 5 ppm

The health guideline of 5 ppm for nitrate and nitrite was defined by EWG based on studies by scientists at the National Cancer Institute and other independent researchers. This health guideline protects against cancer and harm to fetal growth and development.

ppm = parts per million.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The enforceable federal standard that defines the highest level of a contaminant allowed in drinking water.

ppm = parts per million.

EPA Maximum Contaminant
Level Goal (MCLG)10 ppm

A non-enforceable federal health guideline. For cancer-causing chemicals, these health goals are typically set to zero.

ppm = parts per million.

All test results

Date Lab ID Result
2010-02-09AB13495ND
2010-02-09AB134960.0500 ppm
2010-02-09AB13497ND
2010-02-09AB13498ND
2011-02-23AB41052ND
2011-02-23AB41053ND
2011-02-23AB41054ND
2011-02-23AB41055ND
2012-02-07AB662290.01000 ppm
2012-02-07AB66228ND
2012-02-08AB66226ND
2012-02-08AB66227ND
2013-02-27AB92363ND
2013-02-27AB92362ND
2013-02-27AB92361ND
2013-02-27AB92360ND
2014-02-25AC18638ND
2014-02-25AC18637ND
2014-02-25AC18636ND
2014-02-25AC18635ND
2014-02-25AC18634ND
2015-02-18AC42206ND
2015-02-18AC422080.0300 ppm
2015-02-18AC42207ND
2015-02-18AC422090.0140 ppm
2015-02-18AC42205ND