Know Your Environment. Protect Your Health.

Nitrate and nitrite

Tesoro Viejo Master Mwc, Inc.

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.

 

17

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
2022ND30ND
20230.155 ppm21ND - 0.310 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

ppm = parts per million

All test results

Date Lab ID Result
2018-08-31CA2010017_002_002-201808310845ND
2018-12-06CA2010017_006_006-201812061040ND
2018-12-12CA2010017_001_001-201812121045ND
2019-05-15CA2010017_001_001-201905151345ND
2019-06-12CA2010017_006_006-201906121015ND
2019-08-21CA2010017_002_002-201908210955ND
2020-02-19CA2010017_006_006-202002190915ND
2020-06-09CA2010017_001_001-202006090845ND
2020-06-15CA2010017_002_002-202006151100ND
2021-02-17CA2010017_006_006-202102171035ND
2021-06-09CA2010017_001_001-202106090845ND
2021-06-28CA2010017_002_002-202106280955ND
2022-02-16CA2010017_006_006-202202160920ND
2022-06-08CA2010017_001_001-202206080930ND
2022-07-06CA2010017_002_002-202207060900ND
2023-02-13CA2010017_002_002-2023021306300.310 ppm
2023-06-05CA2010017_001_001-202306051040ND