Know Your Environment. Protect Your Health.

Nitrate

Twilight WC

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)

2

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.163 ppm110.163 ppm
20190.104 ppm440.0430 ppm - 0.185 ppm
20200.0540 ppm110.0540 ppm
20210.0840 ppm110.0840 ppm
20220.0830 ppm110.0830 ppm
20230.0780 ppm110.0780 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
2018-12-110.163 ppm
2019-03-200.185 ppm
2019-06-240.114 ppm
2019-08-200.0730 ppm
2019-11-250.0430 ppm
2020-02-260.0540 ppm
2021-12-270.0840 ppm
2022-06-270.0830 ppm
2023-12-140.0780 ppm