Nitrate and nitrite

Utilities Inc. - Green Brier Water Supply

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	0.0815 ppm	4	4	0.0330 ppm - 0.130 ppm
2016	0.0450 ppm	2	2	0.0450 ppm
2017	ND	4	0	ND
2018	0.400 ppm	4	4	0.300 ppm - 0.500 ppm
2019	0.1000 ppm	4	2	ND - 0.200 ppm

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
2014-07-15	AD93541	ND
2014-07-15	AD93531	ND
2014-07-15	AD93541	ND
2014-07-15	AD93531	ND
2015-11-05	35216558017	0.0330 ppm
2015-11-05	35217769020	0.130 ppm
2015-11-05	35217769020	0.130 ppm
2015-11-05	35216558017	0.0330 ppm
2016-12-02	35282413012	0.0450 ppm
2016-12-02	35282413012	0.0450 ppm
2017-07-24	AE15944	ND
2017-07-24	AE15960	ND
2017-07-24	AE15944	ND
2017-07-24	AE15960	ND
2018-11-26	B1805588-002	0.300 ppm
2018-11-26	B1805588-001	0.500 ppm
2018-11-26	B1805588-001	0.500 ppm
2018-11-26	B1805588-002	0.300 ppm
2019-09-23	B1904273-001	0.200 ppm
2019-09-23	B1904273-002	ND
2019-09-23	B1904273-001	0.200 ppm
2019-09-23	B1904273-002	ND