Know Your Environment. Protect Your Health.

Nitrate

California Water Service Company Oak Hills

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.

 

24

Samples

0

Samples exceeding legal limit (MCL)

24

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20182.76 ppm330.623 ppm - 6.60 ppm
20192.02 ppm550.625 ppm - 6.77 ppm
20202.84 ppm330.629 ppm - 6.80 ppm
20215.13 ppm440.500 ppm - 9.90 ppm
20223.02 ppm660.530 ppm - 7.50 ppm
20233.07 ppm330.600 ppm - 7.60 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
2018-03-14CA2710019_003_003-2018031413001.06 ppm
2018-03-14CA2710019_008_008-2018031412500.623 ppm
2018-03-21CA2710019_001_001-2018032110416.60 ppm
2019-03-13CA2710019_008_008-2019031310150.625 ppm
2019-03-13CA2710019_003_003-2019031309300.932 ppm
2019-03-20CA2710019_001_001-2019032010506.77 ppm
2019-06-19CA2710019_008_008-2019061913280.660 ppm
2019-09-12CA2710019_003_003-2019091213591.10 ppm
2020-03-04CA2710019_008_008-2020030409160.629 ppm
2020-03-04CA2710019_003_003-2020030409291.10 ppm
2020-03-26CA2710019_001_001-2020032611076.80 ppm
2021-03-15CA2710019_003_003-2021031510460.900 ppm
2021-03-15CA2710019_008_008-2021031510200.500 ppm
2021-06-29CA2710019_001_001-2021062913459.20 ppm
2021-09-22CA2710019_001_001-2021092211019.90 ppm
2022-03-24CA2710019_001_001-2022032410017.50 ppm
2022-03-24CA2710019_003_003-2022032409401.10 ppm
2022-03-24CA2710019_001_001-2022032410007.40 ppm
2022-03-24CA2710019_008_008-2022032409310.600 ppm
2022-06-22CA2710019_008_008-2022062213360.530 ppm
2022-09-22CA2710019_003_003-2022092214150.960 ppm
2023-03-21CA2710019_008_008-2023032113000.600 ppm
2023-03-21CA2710019_003_003-2023032112461.000 ppm
2023-05-08CA2710019_001_001-2023050810207.60 ppm