Nitrate

Oak Valley

Nitrate, a fertilizer chemical, frequently contaminates drinking water due to agricultural and urban runoff, and discharges from municipal wastewater treatment plants and septic tanks. Excessive nitrate in water can cause oxygen deprivation in infants and increase the risk of cancer. 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	3.63 ppm	4	3	ND - 5.10 ppm
2015	2.94 ppm	5	4	ND - 4.70 ppm
2016	1.30 ppm	5	2	ND - 3.30 ppm
2017	0.480 ppm	5	1	ND - 2.40 ppm
2018	ND	2	0	ND
2019	0.0660 ppm	2	1	ND - 0.132 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EWG Health Guideline 0.14 ppm

The EWG Health Guideline of 0.14 ppm for nitrate was defined by EWG . This health guideline protects against cancer and harm to fetal growth and development.

EPA Maximum Contaminant
Level (MCL) 10 ppm

The legal limit for nitrate, established in 1962, was developed to protect infants from acute methemoglobinemia, a life-threatening disorder of oxygen transport in the body. This limit does not fully protect against the risk of cancer and harm to the developing fetus.

ppm = parts per million

All test results

Date	Lab ID	Result
2014-03-25	2040161	5.10 ppm
2014-06-26	2058429	ND
2014-09-30	2081060	4.90 ppm
2014-12-29	2098163	4.50 ppm
2015-03-31	OE225922	4.70 ppm
2015-06-29	OE260751	ND
2015-06-30	OE261378	1.80 ppm
2015-09-29	OE299530	4.50 ppm
2015-12-21	OE329245	3.70 ppm
2016-03-30	OE360002	3.30 ppm
2016-06-28	OE394475	3.20 ppm
2016-06-28	OE394476	ND
2016-09-26	OE433119	ND
2016-12-21	OE464087	ND
2017-03-29	OE495612	2.40 ppm
2017-06-29	OE530779	ND
2017-06-29	OE530781	ND
2017-09-27	OE570611	ND
2017-12-20	OE603184	ND
2018-03-28	OE638507	ND
2018-05-30	OE663820	ND
2019-03-27	AE75610	ND
2019-06-25	AE82480	0.132 ppm