Know Your Environment. Protect Your Health.

Nitrate

Clayton Water Supply Corporation Plant 2

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.

 

6

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.214 ppm110.214 ppm
20190.306 ppm110.306 ppm
20200.0340 ppm110.0340 ppm
2021ND10ND
20220.0437 ppm110.0437 ppm
20230.0558 ppm220.0410 ppm - 0.0706 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
2019-12-17Q19803320060.306 ppm
2020-12-03Q20485570060.0340 ppm
2021-09-28Q2126522005ND
2022-11-03Q22333520040.0437 ppm
2023-07-27Q23302710050.0706 ppm
2023-10-17Q23442530040.0410 ppm