Nitrate and nitrite

Lonoke White Public Water Authority

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	0.0933 ppm	3	2	ND - 0.160 ppm
2015	0.0650 ppm	4	2	ND - 0.130 ppm
2016	0.0560 ppm	5	2	ND - 0.150 ppm
2017	ND	5	0	ND
2018	0.0475 ppm	4	1	ND - 0.190 ppm
2019	0.0525 ppm	4	1	ND - 0.210 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
2014-05-12	141350002	0.160 ppm
2014-07-01	141840054	0.120 ppm
2014-10-08	Y142830004	ND
2015-01-06	Y150080044	0.130 ppm
2015-04-07	Y150990004	0.130 ppm
2015-07-08	Y151900021	ND
2015-10-06	Y152820009	ND
2016-01-05	Y160080042	0.130 ppm
2016-04-05	Y160980002	0.150 ppm
2016-07-06	Y161890016	ND
2016-10-05	Y162790002	ND
2016-10-17	Y162940009	ND
2017-01-05	Y170050023	ND
2017-05-02	Y171240001	ND
2017-07-05	Y171870037	ND
2017-08-15	Y172290019	ND
2017-10-02	Y172780009	ND
2018-01-03	Y180040035	ND
2018-04-04	Y180940002	0.190 ppm
2018-07-04	Y181860020	ND
2018-10-03	Y182770013	ND
2019-01-08	Y190100058	0.210 ppm
2019-05-08	Y191290007	ND
2019-07-09	Y191920029	ND
2019-10-29	Y193050019	ND