Know Your Environment. Protect Your Health.

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.

 

138

Samples

0

Samples exceeding legal limit (MCL)

30

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.252 ppm297ND - 2.50 ppm
20190.268 ppm289ND - 2.60 ppm
2020N/A00N/A
20210.264 ppm276ND - 2.70 ppm
20220.268 ppm266ND - 2.70 ppm
20230.131 ppm284ND - 1.20 ppm

ppm = parts per million

State, National, and Health Guidelines for Drinking Water

EWG Health Guideline: 0.14 ppm

The EWG 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

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
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
2021-06-224136235ND
2021-06-224136234ND
2021-06-224136236ND
2021-06-294136312ND
2021-06-294136311ND
2021-06-294136213ND
2021-06-294136211ND
2021-06-294136212ND
2021-06-294136215ND
2021-06-3041429770.780 ppm
2021-06-3041429721.10 ppm
2021-06-304142976ND
2021-06-304142973ND
2021-07-204148254ND
2021-07-2741482452.70 ppm
2021-07-2741482460.840 ppm
2021-07-274148242ND
2021-07-274148247ND
2021-07-274148241ND
2021-07-274148243ND
2021-07-274148244ND
2021-07-2841482390.910 ppm
2021-07-284148240ND
2021-07-284148236ND
2021-08-0241640300.790 ppm
2021-08-024164031ND
2021-08-024171314ND
2022-03-314263872ND
2022-07-074329449ND
2022-07-074329451ND
2022-07-074329450ND
2022-07-274326513ND
2022-07-284326514ND
2022-07-284326512ND
2022-07-284329443ND
2022-07-284329442ND
2022-08-034326507ND
2022-08-034326506ND
2022-08-0343265080.790 ppm
2022-08-034326510ND
2022-08-0343265090.800 ppm
2022-08-034326505ND
2022-08-0343294390.790 ppm
2022-08-0343294382.70 ppm
2022-08-0343293991.10 ppm
2022-08-044326532ND
2022-08-044326517ND
2022-08-044329456ND
2022-08-044329457ND
2022-08-044329455ND
2022-08-044329459ND
2022-08-1643641870.780 ppm
2022-10-104361298ND
2023-03-274430961ND
2023-04-064439683ND
2023-05-234464427ND
2023-05-234464428ND
2023-05-234464429ND
2023-06-014473372ND
2023-06-014473363ND
2023-06-0144733681.20 ppm
2023-06-014473366ND
2023-06-014473377ND
2023-06-014473370ND
2023-06-014473364ND
2023-06-014473365ND
2023-06-014473374ND
2023-06-014473376ND
2023-06-014473357ND
2023-06-0144733610.840 ppm
2023-06-014474475ND
2023-06-094473404ND
2023-06-0944734050.820 ppm
2023-06-094473412ND
2023-06-094473414ND
2023-06-0944734070.810 ppm
2023-06-094473406ND
2023-06-094473410ND
2023-06-294483491ND
2023-07-114483487ND
2023-09-194531977ND