Nitrate and nitrite

Dubach 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	Detections	Range of results
2014	ND	4	0	ND
2015	0.0175 ppm	4	2	ND - 0.0350 ppm
2016	ND	4	0	ND
2017	0.0165 ppm	4	2	ND - 0.0330 ppm
2018	0.0130 ppm	4	2	ND - 0.0260 ppm
2019	ND	4	0	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
2014-11-05	AD99457	ND
2014-11-05	AD99456	ND
2014-11-05	AD99457	ND
2014-11-05	AD99456	ND
2015-11-05	35217774003	0.0350 ppm
2015-11-05	35217774003	0.0350 ppm
2015-11-05	35217774004	ND
2015-11-05	35217774004	ND
2016-05-25	35246822004	ND
2016-05-25	35246822005	ND
2016-05-25	35246822005	ND
2016-05-25	35246822004	ND
2017-02-08	35294548005	ND
2017-02-08	35294548005	ND
2017-02-08	35294548004	0.0330 ppm
2017-02-08	35294548004	0.0330 ppm
2018-10-30	35427797002	0.0260 ppm
2018-10-30	35427797001	ND
2018-10-30	35427797001	ND
2018-10-30	35427797002	0.0260 ppm
2019-04-16	35462385001	ND
2019-04-16	35462385002	ND
2019-04-16	35462385001	ND
2019-04-16	35462385002	ND