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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Dean Water Supply Corporation

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. Click here to read more about nitrate.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.0292 ppm330.0210 ppm - 0.0405 ppm
20150.0213 ppm330.0145 ppm - 0.0275 ppm
20160.0243 ppm330.0208 ppm - 0.0287 ppm
20170.0207 ppm330.0155 ppm - 0.0241 ppm
20180.0245 ppm330.0190 ppm - 0.0311 ppm
20190.0211 ppm330.0188 ppm - 0.0243 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date Lab ID Result
2014-08-06Q14342100050.0405 ppm
2014-08-06Q14342100040.0260 ppm
2014-12-19Q14607540010.0210 ppm
2015-12-02Q15478590080.0145 ppm
2015-12-02Q15478600020.0220 ppm
2015-12-02Q15478600010.0275 ppm
2016-10-17Q16442880120.0234 ppm
2016-10-17Q16442880140.0208 ppm
2016-10-17Q16442880130.0287 ppm
2017-08-30Q17399780110.0241 ppm
2017-08-30Q17399780100.0155 ppm
2017-08-30Q17399780230.0225 ppm
2018-08-01Q18305130040.0233 ppm
2018-08-01Q18305130110.0311 ppm
2018-08-01Q18305130030.0190 ppm
2019-08-08Q19526720120.0243 ppm
2019-08-08Q19526720160.0202 ppm
2019-08-08Q19526720130.0188 ppm