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EWG's Tap Water Database — 2021 UPDATE

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Nitrate

Clark Public Utilities

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.

MORE ABOUT THIS CONTAMINANT

 

170

Samples

0

Samples exceeding legal limit (MCL)

49

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.308 ppm2921ND - 2.54 ppm
20150.423 ppm3010ND - 2.60 ppm
20160.317 ppm2610ND - 2.52 ppm
20170.300 ppm288ND - 2.80 ppm
20180.252 ppm297ND - 2.50 ppm
20190.268 ppm289ND - 2.60 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
2014-08-11910610.930 ppm
2014-08-11910620.0300 ppm
2014-08-1191063ND
2014-08-1191064ND
2014-08-12910710.190 ppm
2014-08-1291072ND
2014-08-1291073ND
2014-08-12910742.54 ppm
2014-08-13910860.110 ppm
2014-08-13910870.0400 ppm
2014-08-14910930.910 ppm
2014-08-14910940.0700 ppm
2014-08-14910950.0700 ppm
2014-08-14910960.120 ppm
2014-08-14910970.01000 ppm
2014-08-14910980.0200 ppm
2014-08-14910990.0400 ppm
2014-08-18911120.930 ppm
2014-08-19911260.0200 ppm
2014-08-19911350.00600 ppm
2014-08-19911360.00900 ppm
2014-08-19911370.00400 ppm
2014-08-1991138ND
2014-08-26910311.56 ppm
2014-09-04912430.940 ppm
2014-10-2751301ND
2014-10-27513020.390 ppm
2014-10-2751303ND
2014-12-0813301ND
2015-09-3054101ND
2015-10-0203901ND
2015-10-05074010.930 ppm
2015-10-0610403ND
2015-10-0610402ND
2015-10-0610401ND
2015-10-0714904ND
2015-10-0714905ND
2015-10-07149030.520 ppm
2015-10-08175010.580 ppm
2015-10-12222050.700 ppm
2015-10-12222060.940 ppm
2015-10-12222082.60 ppm
2015-10-1222207ND
2015-10-1326204ND
2015-10-1326203ND
2015-10-13262011.10 ppm
2015-10-1326202ND
2015-10-1934403ND
2015-10-1934404ND
2015-10-19344010.920 ppm
2015-10-2036802ND
2015-10-20368012.30 ppm
2015-10-2750803ND
2015-11-19387012.10 ppm
2015-11-1938501ND
2015-12-0102101ND
2015-12-0102102ND
2015-12-0711801ND
2015-12-2842001ND
2016-05-250.890 ppm
2016-05-25ND
2016-05-25ND
2016-05-25ND
2016-05-25ND
2016-05-25ND
2016-05-250.160 ppm
2016-05-25ND
2016-05-250.900 ppm
2016-06-28ND
2016-06-280.400 ppm
2016-06-28ND
2016-06-28ND
2016-06-28ND
2016-06-28ND
2016-06-282.52 ppm
2016-06-280.740 ppm
2016-08-01ND
2016-08-010.130 ppm
2016-08-300.710 ppm
2016-08-300.990 ppm
2016-08-300.800 ppm
2016-09-14ND
2016-09-14ND
2016-09-28ND
2016-09-28ND
2017-07-070.830 ppm
2017-07-072.80 ppm
2017-07-07ND
2017-07-07ND
2017-07-07ND
2017-07-270.800 ppm
2017-07-28ND
2017-07-280.860 ppm
2017-07-28ND
2017-07-280.810 ppm
2017-07-280.670 ppm
2017-07-28ND
2017-07-28ND
2017-07-28ND
2017-07-28ND
2017-07-28ND
2017-07-28ND
2017-07-28ND
2017-07-31ND
2017-08-020.730 ppm
2017-08-03ND
2017-08-03ND
2017-08-03ND
2017-08-030.910 ppm
2017-08-03ND
2017-08-03ND
2017-08-03ND
2017-08-07ND
2018-07-26ND
2018-07-26ND
2018-07-31ND
2018-08-010.830 ppm
2018-08-010.760 ppm
2018-08-010.830 ppm
2018-08-01ND
2018-08-010.840 ppm
2018-08-08ND
2018-08-14ND
2018-08-200.630 ppm
2018-08-20ND
2018-08-20ND
2018-08-20ND
2018-08-20ND
2018-08-24ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-282.50 ppm
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-08-28ND
2018-11-180.910 ppm
2019-04-02ND
2019-04-03ND
2019-05-08ND
2019-05-08ND
2019-05-160.760 ppm
2019-05-16ND
2019-05-20ND
2019-05-20ND
2019-05-210.118 ppm
2019-05-210.0560 ppm
2019-06-12ND
2019-06-13ND
2019-06-13ND
2019-07-170.770 ppm
2019-07-22ND
2019-07-22ND
2019-07-222.60 ppm
2019-07-22ND
2019-07-220.670 ppm
2019-07-23ND
2019-08-280.790 ppm
2019-08-28ND
2019-09-050.930 ppm
2019-09-05ND
2019-09-050.810 ppm
2019-09-05ND
2019-09-05ND
2019-09-17ND