Nitrate and nitrite

Aqua Water Supply Corporation

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	0.0233 ppm	3	3	0.01000 ppm - 0.0300 ppm
2015	0.0522 ppm	9	9	0.01000 ppm - 0.170 ppm
2016	N/A	0	0	N/A
2017	N/A	0	0	N/A
2018	N/A	0	0	N/A
2019	0.0308 ppm	12	3	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
2014-02-05	AC41413	0.0300 ppm
2014-04-14	AC50247	0.0300 ppm
2014-08-13	AC63314	0.01000 ppm
2015-02-09	AC79587	0.0400 ppm
2015-02-09	AC79586	0.0600 ppm
2015-02-09	AC79589	0.170 ppm
2015-02-09	AC79588	0.0400 ppm
2015-02-10	AC79825	0.0200 ppm
2015-02-10	AC79826	0.0400 ppm
2015-02-10	AC79822	0.0400 ppm
2015-02-10	AC79823	0.01000 ppm
2015-02-10	AC79824	0.0500 ppm
2019-05-15	AE66346	ND
2019-05-15	AE66347	ND
2019-05-15	AE66357	ND
2019-05-15	AE66350	ND
2019-05-15	AE66352	ND
2019-05-15	AE66348	ND
2019-05-15	AE66353	0.0600 ppm
2019-05-15	AE66355	ND
2019-05-15	AE66349	ND
2019-05-15	AE66354	0.110 ppm
2019-05-15	AE66351	ND
2019-05-15	AE66356	0.200 ppm