Know Your Environment. Protect Your Health.

Nitrate and nitrite

Cws-split Mountain Water System

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

14

Samples

0

Samples exceeding legal limit (MCL)

14

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20181.30 ppm221.30 ppm
20190.577 ppm330.410 ppm - 0.680 ppm
20200.730 ppm330.450 ppm - 0.880 ppm
20210.457 ppm330.450 ppm - 0.460 ppm
2022N/A00N/A
20230.853 ppm330.760 ppm - 1.000 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

ppm = parts per million

All test results

Date Lab ID Result
2018-01-23CA1500407_006_006-2018012309501.30 ppm
2018-01-23CA1500407_005_005-2018012310101.30 ppm
2019-01-15CA1500407_006_006-2019011511320.640 ppm
2019-01-15CA1500407_005_005-2019011511500.680 ppm
2019-05-13CA1500407_002_002-2019051309580.410 ppm
2020-01-22CA1500407_005_005-2020012214500.860 ppm
2020-01-22CA1500407_006_006-2020012214380.880 ppm
2020-02-11CA1500407_007_007-2020021112470.450 ppm
2021-01-26CA1500407_006_006-2021012613360.460 ppm
2021-01-26CA1500407_006_006-2021012613360.460 ppm
2021-01-26CA1500407_005_005-2021012613440.450 ppm
2023-01-26CA1500407_005_005-2023012609260.800 ppm
2023-01-26CA1500407_006_006-2023012609340.760 ppm
2023-02-23CA1500407_007_007-2023022313001.000 ppm