Nitrate and nitrite

Midwest City

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	0.217 ppm	13	13	0.1000 ppm - 0.370 ppm
2015	0.236 ppm	13	13	0.110 ppm - 0.390 ppm
2016	0.255 ppm	13	13	0.110 ppm - 0.430 ppm
2017	0.287 ppm	12	12	0.110 ppm - 0.480 ppm
2018	0.275 ppm	11	11	0.120 ppm - 0.410 ppm
2019	0.295 ppm	11	11	0.120 ppm - 0.440 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
2014-03-04	040607.013	0.110 ppm
2014-03-04	040607.001	0.1000 ppm
2014-03-04	040607.003	0.210 ppm
2014-03-04	040607.004	0.320 ppm
2014-03-04	040607.005	0.200 ppm
2014-03-04	040607.006	0.300 ppm
2014-03-04	040607.007	0.280 ppm
2014-03-04	040607.008	0.110 ppm
2014-03-04	040607.009	0.110 ppm
2014-03-04	040607.010	0.280 ppm
2014-03-04	040607.011	0.200 ppm
2014-03-04	040607.012	0.370 ppm
2014-09-08	048634.001	0.230 ppm
2015-03-10	053955.009	0.110 ppm
2015-03-10	053955.001	0.150 ppm
2015-03-10	053955.002	0.330 ppm
2015-03-10	053955.003	0.240 ppm
2015-03-10	053955.004	0.340 ppm
2015-03-10	053955.005	0.160 ppm
2015-03-10	053955.006	0.230 ppm
2015-03-10	053955.008	0.110 ppm
2015-03-10	053955.007	0.280 ppm
2015-03-10	053955.010	0.290 ppm
2015-03-10	053955.011	0.190 ppm
2015-03-10	053955.012	0.390 ppm
2015-03-10	053955.013	0.250 ppm
2016-03-09	SDWA-1012590-00	0.310 ppm
2016-03-09	SDWA-1012591-00	0.190 ppm
2016-03-09	SDWA-1012592-00	0.320 ppm
2016-03-09	SDWA-1012593-00	0.240 ppm
2016-03-09	SDWA-1012594-00	0.110 ppm
2016-03-09	SDWA-1012595-00	0.110 ppm
2016-03-09	SDWA-1012596-00	0.290 ppm
2016-03-09	SDWA-1012597-00	0.230 ppm
2016-03-09	SDWA-1012598-00	0.400 ppm
2016-03-09	SDWA-1012599-00	0.430 ppm
2016-03-09	SDWA-1012589-00	0.270 ppm
2016-03-09	SDWA-1012588-00	0.230 ppm
2016-03-09	SDWA-1012587-00	0.190 ppm
2017-01-24	SDWA-1116318-00	0.280 ppm
2017-01-24	SDWA-1116310-00	0.480 ppm
2017-01-24	SDWA-1116312-00	0.430 ppm
2017-01-24	SDWA-1116314-00	0.110 ppm
2017-01-24	SDWA-1116316-00	0.250 ppm
2017-01-24	SDWA-1116320-00	0.340 ppm
2017-01-24	SDWA-1116322-00	0.210 ppm
2017-01-24	SDWA-1116326-00	0.350 ppm
2017-01-24	SDWA-1116328-00	0.120 ppm
2017-01-24	SDWA-1116330-00	0.120 ppm
2017-01-24	SDWA-1116332-00	0.370 ppm
2017-01-24	SDWA-1116334-00	0.380 ppm
2018-01-22	SDWA-1227933-00	0.210 ppm
2018-01-22	SDWA-1227919-00	0.390 ppm
2018-01-22	SDWA-1227921-00	0.410 ppm
2018-01-22	SDWA-1227923-00	0.120 ppm
2018-01-22	SDWA-1227925-00	0.250 ppm
2018-01-22	SDWA-1227927-00	0.270 ppm
2018-01-22	SDWA-1227929-00	0.380 ppm
2018-01-22	SDWA-1227931-00	0.230 ppm
2018-01-22	SDWA-1227935-00	0.120 ppm
2018-01-22	SDWA-1227937-00	0.380 ppm
2018-01-22	SDWA-1227939-00	0.260 ppm
2019-01-07	SDWA-1338810-00	0.140 ppm
2019-01-07	SDWA-1338808-00	0.190 ppm
2019-01-07	SDWA-1338804-00	0.330 ppm
2019-01-07	SDWA-1338802-00	0.380 ppm
2019-01-07	SDWA-1338800-00	0.290 ppm
2019-01-07	SDWA-1338798-00	0.270 ppm
2019-01-07	SDWA-1338796-00	0.120 ppm
2019-01-07	SDWA-1338794-00	0.440 ppm
2019-01-07	SDWA-1338790-00	0.300 ppm
2019-01-08	SDWA-1338812-00	0.370 ppm
2019-01-08	SDWA-1338814-00	0.420 ppm