Know Your Environment. Protect Your Health.

Nitrate

Cws-split 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.

 

30

Samples

0

Samples exceeding legal limit (MCL)

27

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20180.827 ppm43ND - 1.30 ppm
20190.640 ppm440.410 ppm - 0.831 ppm
20200.558 ppm87ND - 0.880 ppm
20210.376 ppm54ND - 0.510 ppm
20220.740 ppm550.600 ppm - 0.880 ppm
20230.940 ppm440.760 ppm - 1.20 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
2018-01-23CA1500407_005_005-2018012310101.30 ppm
2018-01-23CA1500407_006_006-2018012309501.30 ppm
2018-02-26CA1500407_007_007-2018022611050.708 ppm
2018-11-28CA1500407_002_002-201811281115ND
2019-01-15CA1500407_006_006-2019011511320.640 ppm
2019-01-15CA1500407_005_005-2019011511500.680 ppm
2019-02-26CA1500407_007_007-2019022612310.831 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
2020-02-13CA1500407_002_002-202002130920ND
2020-06-02CA1500407_DST_901-2020060213400.470 ppm
2020-08-19CA1500407_DST_901-2020081912570.590 ppm
2020-08-19CA1500407_006_006-2020081914350.590 ppm
2020-08-19CA1500407_007_007-2020081913270.620 ppm
2021-01-26CA1500407_006_006-2021012613360.460 ppm
2021-01-26CA1500407_005_005-2021012613440.450 ppm
2021-01-26CA1500407_006_006-2021012613360.460 ppm
2021-02-18CA1500407_007_007-2021021812180.510 ppm
2021-05-06CA1500407_002_002-202105061123ND
2022-01-11CA1500407_006_006-2022011113330.700 ppm
2022-01-18CA1500407_006_006-2022011811110.690 ppm
2022-01-18CA1500407_005_005-2022011810560.830 ppm
2022-01-20CA1500407_006_006-2022012011060.880 ppm
2022-02-23CA1500407_007_007-2022022313200.600 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
2023-04-18CA1500407_007_007-2023041813251.20 ppm