Nitrate and nitrite

Arizona Water Company - Overgaard

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
2013	N/A	0	0	N/A
2014	0.140 ppm	5	3	ND - 0.260 ppm
2015	0.200 ppm	5	4	ND - 0.330 ppm
2016	0.192 ppm	5	4	ND - 0.270 ppm
2017	0.101 ppm	5	2	ND - 0.264 ppm
2018	0.218 ppm	5	5	0.160 ppm - 0.260 ppm
2019	N/A	0	0	N/A

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
2014-08-14	4081368-05	0.240 ppm
2014-08-14	4081368-04	0.200 ppm
2014-08-14	4081368-03	ND
2014-08-14	4081368-02	0.260 ppm
2014-08-14	4081368-01	ND
2015-05-26	5052018-05I	0.240 ppm
2015-05-26	5052018-04I	0.210 ppm
2015-05-26	5052018-03I	0.220 ppm
2015-05-26	5052018-02I	0.330 ppm
2015-05-26	5052018-01I	ND
2016-05-10	6050960-03	0.220 ppm
2016-05-10	6050960-05	0.260 ppm
2016-05-10	6050960-04	0.210 ppm
2016-05-10	6050960-02	0.270 ppm
2016-05-10	6050960-01	ND
2017-05-08	7050900-05	0.243 ppm
2017-05-08	7050900-04	ND
2017-05-08	7050900-03	ND
2017-05-08	7050900-02	0.264 ppm
2017-05-08	7050900-01	ND
2018-05-21	18E2216-01 IOC	0.160 ppm
2018-05-21	18E2216-05 IOC	0.240 ppm
2018-05-21	18E2216-04 IOC	0.220 ppm
2018-05-21	18E2216-03 IOC	0.210 ppm
2018-05-21	18E2216-02 IOC	0.260 ppm