Nitrate and nitrite

Pleasant Valley Water System

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.

MORE ABOUT THIS CONTAMINANT

Samples

Samples exceeding legal limit (MCL)

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Range of results
2014	ND	2	ND
2015	ND	6	ND
2016	ND	4	ND
2017	ND	4	ND
2018	ND	6	ND
2019	ND	4	ND

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The 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
2014-12-02	AE00068	ND
2014-12-02	AE00068	ND
2015-08-31	35205348001	ND
2015-08-31	35205348002	ND
2015-08-31	35205348003	ND
2015-08-31	35205348003	ND
2015-08-31	35205348002	ND
2015-08-31	35205348001	ND
2016-11-02	35275606010	ND
2016-11-02	35275606006	ND
2016-11-02	35275606006	ND
2016-11-02	35275606010	ND
2017-11-02	35346846002	ND
2017-11-02	35346846001	ND
2017-11-02	35346846001	ND
2017-11-02	35346846002	ND
2018-04-23	35387968003	ND
2018-04-23	35387968002	ND
2018-04-23	35387968001	ND
2018-04-23	35387968001	ND
2018-04-23	35387968002	ND
2018-04-23	35387968003	ND
2019-08-12	35490098001	ND
2019-08-12	35490098002	ND
2019-08-12	35490098001	ND
2019-08-12	35490098002	ND