Know Your Environment. Protect Your Health.

Nitrate

California Water Service Company Las Lomas

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

6

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND20ND
2019ND30ND
2020ND30ND
20211.67 ppm330.200 ppm - 4.60 ppm
2022ND30ND
20230.243 ppm330.200 ppm - 0.330 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
2018-03-12CA2710013_003_003-201803121052ND
2018-03-12CA2710013_004_004-201803121042ND
2019-03-12CA2710013_004_004-201903120932ND
2019-03-12CA2710013_003_003-201903120924ND
2019-08-07CA2710013_003_003-201908071410ND
2020-03-04CA2710013_004_004-202003041030ND
2020-03-04CA2710013_003_003-202003041042ND
2020-08-12CA2710013_004_004-202008121414ND
2021-03-15CA2710013_003_003-2021031512060.200 ppm
2021-03-15CA2710013_004_004-2021031511400.200 ppm
2021-09-21CA2710013_001_001-2021092112554.60 ppm
2022-03-23CA2710013_003_003-202203231311ND
2022-03-23CA2710013_004_004-202203231300ND
2022-08-03CA2710013_003_003-202208031403ND
2023-03-21CA2710013_004_004-2023032113400.200 ppm
2023-03-21CA2710013_003_003-2023032113520.200 ppm
2023-08-23CA2710013_004_004-2023082313140.330 ppm