Know Your Environment. Protect Your Health.

Nitrate

Knights Landing Service District

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.

 

12

Samples

0

Samples exceeding legal limit (MCL)

5

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND10ND
2019ND30ND
20200.407 ppm32ND - 0.720 ppm
2021N/A00N/A
20220.367 ppm31ND - 1.10 ppm
20230.555 ppm220.430 ppm - 0.680 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
2018-02-15CA5710004_003_003-201802150910ND
2019-01-15CA5710004_004_004-201901150920ND
2019-02-14CA5710004_003_003-201902140925ND
2019-02-14CA5710004_005_005-201902140850ND
2020-02-25CA5710004_003_003-2020022511000.720 ppm
2020-02-25CA5710004_004_004-2020022511300.500 ppm
2020-02-25CA5710004_005_005-202002250955ND
2022-03-24CA5710004_003_003-2022032410451.10 ppm
2022-03-24CA5710004_005_005-202203241300ND
2022-07-25CA5710004_004_004-202207251023ND
2023-12-29CA5710004_003_003-2023122907520.680 ppm
2023-12-29CA5710004_004_004-2023122907300.430 ppm