Nitrate and nitrite

Washington Court House PWS

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	N/A	0	0	N/A
2017	ND	4	0	ND
2018	0.434 ppm	12	9	ND - 1.000 ppm
2019	0.467 ppm	10	7	ND - 0.990 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
2017-09-12	17-27475-01	ND
2017-10-09	17-29477-01	ND
2017-11-06	17-31416-01	ND
2017-12-04	17-32978-01	ND
2018-01-08	18-10465-01	0.240 ppm
2018-02-05	18-11989-01	0.510 ppm
2018-03-05	18-13733-01	0.660 ppm
2018-04-16	18-16843-01	0.920 ppm
2018-05-01	18-17924-01	1.000 ppm
2018-06-04	18-20450-01	0.970 ppm
2018-07-02	18-23227-01	0.580 ppm
2018-08-08	18-26527-01A	0.190 ppm
2018-09-04	18-28722-03A	ND
2018-10-02	18-31529-01	ND
2018-11-08	18-34460-01	ND
2018-12-10	18-36717-01	0.140 ppm
2019-01-08	19-10589-01	0.240 ppm
2019-02-08	19-12707-05	0.440 ppm
2019-03-12	19-14878-01	0.840 ppm
2019-04-22	19-17957-01	0.990 ppm
2019-05-08	19-19082-01A	0.960 ppm
2019-06-04	19-21219-01	0.800 ppm
2019-07-01	19-23648-01	0.400 ppm
2019-08-26	19-28771-01	ND
2019-09-03	19-29366-01	ND
2019-10-07	19-32446-01	ND