Know Your Environment. Protect Your Health.

Nitrate

Green River Mutual Water Company

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)

12

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.00 ppm330.700 ppm - 4.40 ppm
20190.567 ppm32ND - 1.20 ppm
20201.27 ppm330.400 ppm - 3.00 ppm
20210.400 ppm31ND - 1.20 ppm
20220.613 ppm32ND - 1.40 ppm
20230.400 ppm31ND - 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
2018-11-06CA4000554_012_012-2018110607004.40 ppm
2018-11-06CA4000554_003_003-2018110607300.900 ppm
2018-11-06CA4000554_001_001-2018110607150.700 ppm
2019-06-04CA4000554_001_001-2019060407000.500 ppm
2019-06-04CA4000554_003_003-2019060407001.20 ppm
2019-06-04CA4000554_012_012-201906040700ND
2020-07-22CA4000554_012_012-2020072213300.400 ppm
2020-07-22CA4000554_003_003-2020072213503.00 ppm
2020-07-22CA4000554_001_001-2020072213150.400 ppm
2021-04-05CA4000554_003_003-2021040510451.20 ppm
2021-04-05CA4000554_012_012-202104050950ND
2021-04-05CA4000554_001_001-202104051025ND
2022-12-05CA4000554_003_003-2022120512101.40 ppm
2022-12-05CA4000554_012_012-202212051010ND
2022-12-05CA4000554_001_001-2022120511100.440 ppm
2023-07-11CA4000554_012_012-202307111250ND
2023-07-11CA4000554_001_001-202307111345ND
2023-07-11CA4000554_003_003-2023071114001.20 ppm