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EWG's Tap Water Database — 2021 UPDATE

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Nitrate and nitrite

Southern Okla Water Corp

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

 

61

Samples

0

Samples exceeding legal limit (MCL)

20

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20140.292 ppm92ND - 2.38 ppm
20150.324 ppm105ND - 2.64 ppm
20160.445 ppm107ND - 3.15 ppm
20170.368 ppm93ND - 2.87 ppm
20180.0757 ppm135ND - 0.279 ppm
20190.159 ppm103ND - 0.996 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
2014-02-181402503ND
2014-02-1814025020.251 ppm
2014-03-111403418ND
2014-03-111403417ND
2014-03-111403416ND
2014-03-111403415ND
2014-03-111403414ND
2014-03-1114034132.38 ppm
2014-03-111403412ND
2015-01-2015015060.200 ppm
2015-01-201501504ND
2015-01-2015015052.64 ppm
2015-01-201501507ND
2015-01-2015015090.200 ppm
2015-01-2015015100.1000 ppm
2015-01-201501511ND
2015-01-201501508ND
2015-06-1515065210.1000 ppm
2015-12-161512526ND
2016-01-041601063ND
2016-01-0416010550.240 ppm
2016-01-041601061ND
2016-01-0416010650.130 ppm
2016-01-0416010670.240 ppm
2016-01-0516010690.410 ppm
2016-01-0516010590.160 ppm
2016-01-051601057ND
2016-01-0516010530.120 ppm
2016-02-1216025163.15 ppm
2017-01-3117020640.229 ppm
2017-01-311702065ND
2017-01-311702063ND
2017-01-311702062ND
2017-01-311702061ND
2017-01-3117020602.87 ppm
2017-01-3117020590.216 ppm
2017-01-311702058ND
2017-01-311702057ND
2018-01-091801352ND
2018-01-091801351ND
2018-01-1518014290.279 ppm
2018-01-151801430ND
2018-01-1518014310.237 ppm
2018-01-1518014330.232 ppm
2018-01-151801434ND
2018-01-1518014320.234 ppm
2018-02-061802164ND
2018-02-0618021630.00257 ppm
2018-05-031805210ND
2018-09-2718091051ND
2018-11-131811419ND
2019-01-221901600ND
2019-01-2219016010.996 ppm
2019-01-2219016020.320 ppm
2019-01-221901603ND
2019-01-221901604ND
2019-01-221901605ND
2019-01-221901606ND
2019-01-2219016070.272 ppm
2019-01-221901608ND
2019-02-071902220ND