Know Your Environment. Protect Your Health.

Nitrate

Morton Valley Water Supply Corporation

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)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.142 ppm110.142 ppm
20190.128 ppm110.128 ppm
20200.279 ppm110.279 ppm
20210.189 ppm110.189 ppm
20220.307 ppm110.307 ppm
20230.356 ppm110.356 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
2018-03-01Q18087160020.142 ppm
2019-05-23Q19281620010.128 ppm
2020-11-19Q20460380030.279 ppm
2021-03-16Q21067770010.189 ppm
2022-08-11Q22233390010.307 ppm
2023-04-18Q23142690030.356 ppm