Know Your Environment. Protect Your Health.

Nitrate and nitrite

Ventura County Waterworks District No. 19 - Somis

Nitrate and nitrite enter water from fertilizer runoff, septic tanks and urban runoff. These contaminants can cause oxygen deprivation for infants and increase the risk of cancer. Nitrite is significantly more toxic than nitrate. Click here to read more about nitrate.

 

18

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
2022ND30ND
2023ND30ND

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

ppm = parts per million

All test results

Date Lab ID Result
2018-08-01CA5610015_002_002-201808011404ND
2018-08-01CA5610015_007_007-201808011337ND
2018-08-14CA5610015_001_001-201808141147ND
2019-08-07CA5610015_007_007-201908071317ND
2019-08-07CA5610015_001_001-201908071409ND
2019-08-07CA5610015_002_002-201908071345ND
2020-08-03CA5610015_007_007-202008031556ND
2020-08-04CA5610015_001_001-202008041455ND
2020-08-04CA5610015_002_002-202008041411ND
2021-08-04CA5610015_007_007-202108040940ND
2021-08-04CA5610015_002_002-202108040830ND
2021-08-04CA5610015_001_001-202108041007ND
2022-08-16CA5610015_002_002-202208160933ND
2022-08-17CA5610015_007_007-202208170841ND
2022-08-22CA5610015_001_001-202208221052ND
2023-08-08CA5610015_001_001-202308081445ND
2023-08-08CA5610015_002_002-202308081515ND
2023-08-09CA5610015_007_007-202308090930ND