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EWG's Tap Water Database — 2019 UPDATE

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Nitrate

Concord Water Department

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.

 

29

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
20130.240 ppm52ND - 0.700 ppm
20140.160 ppm51ND - 0.800 ppm
20150.140 ppm51ND - 0.700 ppm
20160.320 ppm51ND - 1.60 ppm
20170.760 ppm51ND - 3.80 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
2012-10-23115341.01ND
2012-10-23115341.02ND
2012-10-23115341.03ND
2012-10-23115341.04ND
2013-08-13123484.010.500 ppm
2013-10-23125755.04ND
2013-10-23125755.03ND
2013-10-23125755.020.700 ppm
2013-10-23125755.01ND
2014-08-08134540.01ND
2014-10-31137495.01ND
2014-10-31137495.020.800 ppm
2014-10-31137495.03ND
2014-10-31137495.04ND
2015-08-07146612.01ND
2015-10-15149110.01ND
2015-10-15149110.020.700 ppm
2015-10-15149110.03ND
2015-10-15149110.04ND
2016-08-05159131.01ND
2016-10-07161374.05ND
2016-10-07161374.04ND
2016-10-07161374.031.60 ppm
2016-10-07161374.02ND
2017-08-04171853.01ND
2017-11-13175839.02ND
2017-11-13175839.033.80 ppm
2017-11-13175839.04ND
2017-11-13175839.05ND