Nitrate and nitrite

Butler County Public Water Supply District 1

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	0.487 ppm	3	3	0.360 ppm - 0.650 ppm
2015	0.364 ppm	4	4	0.0820 ppm - 0.750 ppm
2016	0.408 ppm	4	4	0.120 ppm - 0.690 ppm
2017	0.438 ppm	4	4	0.140 ppm - 0.740 ppm
2018	0.428 ppm	4	4	0.170 ppm - 0.730 ppm
2019	0.408 ppm	4	4	0.190 ppm - 0.720 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
2014-04-24	AC22091	0.650 ppm
2014-04-24	AC22092	0.450 ppm
2014-04-24	AC22090	0.360 ppm
2015-09-30	AC59826	0.540 ppm
2015-09-30	AC59828	0.0840 ppm
2015-09-30	AC59829	0.0820 ppm
2015-09-30	AC59827	0.750 ppm
2016-09-08	AC84302	0.120 ppm
2016-09-08	AC84303	0.320 ppm
2016-09-08	AC84304	0.690 ppm
2016-09-08	AC84301	0.500 ppm
2017-09-12	AD06871	0.740 ppm
2017-09-12	AD06874	0.330 ppm
2017-09-12	AD06872	0.540 ppm
2017-09-12	AD06873	0.140 ppm
2018-09-24	AD33255	0.170 ppm
2018-09-24	AD33252	0.270 ppm
2018-09-24	AD33253	0.730 ppm
2018-09-24	AD33254	0.540 ppm
2019-09-17	AD55571	0.530 ppm
2019-09-17	AD55572	0.190 ppm
2019-09-17	AD55573	0.720 ppm
2019-09-17	AD55574	0.190 ppm