Know Your Environment. Protect Your Health.

Nitrate

The Mountain 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.

 

13

Samples

0

Samples exceeding legal limit (MCL)

13

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.08 ppm440.800 ppm - 1.41 ppm
20190.740 ppm220.610 ppm - 0.870 ppm
20200.673 ppm330.300 ppm - 0.860 ppm
20210.270 ppm110.270 ppm
20220.430 ppm110.430 ppm
20230.215 ppm220.210 ppm - 0.220 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
2018-03-07282518-2018-DW1.41 ppm
2018-03-07282519-2018-DW0.970 ppm
2018-08-15292290-2018-DW1.14 ppm
2018-08-15292291-2018-DW0.800 ppm
2019-02-26301433-2019-DWI0.870 ppm
2019-02-26301435-2019-DW0.610 ppm
2020-03-18322189-2020-DW0.860 ppm
2020-03-18322189-2020-DW0.860 ppm
2020-12-08336851-2020-DW0.300 ppm
2021-12-28810-10897-10.270 ppm
2022-03-14FWC0175-01A0.430 ppm
2023-02-16FXB0442-010.210 ppm
2023-02-16FXB0447-010.220 ppm