Nitrate and nitrite

Prescott Valley WD Upper

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	N/A	0	0	N/A
2015	N/A	0	0	N/A
2016	0.630 ppm	2	2	0.260 ppm - 1.000 ppm
2017	N/A	0	0	N/A
2018	1.000 ppm	8	8	0.300 ppm - 1.90 ppm
2019	0.356 ppm	12	12	0.230 ppm - 0.520 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
2016-02-09	201602100057I	0.260 ppm
2016-02-10	201602110028I	1.000 ppm
2018-03-07	201803080211I	0.720 ppm
2018-03-07	201803080210I	1.70 ppm
2018-03-07	201803080209I	1.20 ppm
2018-03-07	201803080208I	0.980 ppm
2018-03-07	201803080207I	1.90 ppm
2018-03-07	201803080206I	0.810 ppm
2018-03-07	201803080205I	0.300 ppm
2018-04-25	201804260236I	0.390 ppm
2019-02-05	201902060077I	0.280 ppm
2019-02-06	201902070484I	0.230 ppm
2019-02-06	201902070483I	0.440 ppm
2019-02-06	201902070482I	0.380 ppm
2019-02-06	201902070480I	0.410 ppm
2019-05-07	201905080065I	0.520 ppm
2019-06-19	19F2188-01	0.510 ppm
2019-06-24	201906250033I	0.410 ppm
2019-09-16	19I1769-02	0.240 ppm
2019-09-30	19J0031-01	0.230 ppm
2019-10-15	201910160121I	0.270 ppm
2019-10-15	201910160122I	0.350 ppm