Know Your Environment. Protect Your Health.

Nitrate

Northwest Utility District-SD

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.

 

10

Samples

0

Samples exceeding legal limit (MCL)

10

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.949 ppm220.909 ppm - 0.988 ppm
20190.871 ppm220.601 ppm - 1.14 ppm
20201.16 ppm221.13 ppm - 1.19 ppm
20210.464 ppm110.464 ppm
20220.596 ppm220.596 ppm
20230.773 ppm110.773 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 Result
2018-02-260.988 ppm
2018-08-130.909 ppm
2019-01-140.601 ppm
2019-09-161.14 ppm
2020-01-141.19 ppm
2020-10-061.13 ppm
2021-02-010.464 ppm
2022-01-120.596 ppm
2022-01-120.596 ppm
2023-04-170.773 ppm