Know Your Environment. Protect Your Health.

Nitrate

City of Colusa

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)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND50ND
2019ND50ND
2020ND50ND
2021ND50ND
2022ND50ND
2023ND50ND

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
2018-06-11CA0610002_006_006-201806110900ND
2018-06-12CA0610002_002_002-201806120735ND
2018-06-12CA0610002_003_003-201806120745ND
2018-06-12CA0610002_004_004-201806120715ND
2018-06-12CA0610002_005_005-201806120700ND
2019-04-22CA0610002_003_003-201904220730ND
2019-04-22CA0610002_002_002-201904220710ND
2019-06-10CA0610002_004_004-201906100710ND
2019-06-10CA0610002_006_006-201906100810ND
2019-08-26CA0610002_005_005-201908260930ND
2020-04-07CA0610002_003_003-202004070840ND
2020-04-07CA0610002_002_002-202004070800ND
2020-04-20CA0610002_004_004-202004200950ND
2020-04-27CA0610002_005_005-202004270840ND
2020-04-30CA0610002_006_006-202004300800ND
2021-06-07CA0610002_004_004-202106070810ND
2021-06-07CA0610002_003_003-202106070740ND
2021-06-07CA0610002_006_006-202106070910ND
2021-06-07CA0610002_002_002-202106070830ND
2021-06-07CA0610002_005_005-202106070900ND
2022-05-17CA0610002_005_005-202205170800ND
2022-05-17CA0610002_002_002-202205170700ND
2022-05-17CA0610002_006_006-202205170820ND
2022-05-17CA0610002_003_003-202205170720ND
2022-05-17CA0610002_004_004-202205170630ND
2023-02-22CA0610002_006_006-202302220730ND
2023-02-22CA0610002_002_002-202302220720ND
2023-02-22CA0610002_003_003-202302220710ND
2023-02-22CA0610002_004_004-202302220755ND
2023-02-22CA0610002_005_005-202302220700ND