Know Your Environment. Protect Your Health.

Nitrate

Silverton Municipal Water System

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)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.0997 ppm110.0997 ppm
20190.213 ppm110.213 ppm
20200.277 ppm110.277 ppm
20210.409 ppm110.409 ppm
20220.0799 ppm110.0799 ppm
20230.404 ppm110.404 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
2018-04-17Q18157820010.0997 ppm
2019-05-02Q19180840010.213 ppm
2020-05-14Q20195500010.277 ppm
2021-04-27Q21106480010.409 ppm
2022-05-03Q22131800010.0799 ppm
2023-05-11Q23180350010.404 ppm