Know Your Environment. Protect Your Health.

Nitrate

Madison Suburban Utility District

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.

 

9

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.103 ppm110.103 ppm
20190.485 ppm110.485 ppm
20200.519 ppm110.519 ppm
20210.373 ppm110.373 ppm
20220.402 ppm220.402 ppm
20230.521 ppm330.521 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
2018-02-060.103 ppm
2019-02-050.485 ppm
2020-01-060.519 ppm
2021-01-060.373 ppm
2022-01-040.402 ppm
2022-01-040.402 ppm
2023-01-100.521 ppm
2023-01-100.521 ppm
2023-01-100.521 ppm