Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Nitrate and nitrite

Lafayette Utilities Water System

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

 

142

Samples

0

Samples exceeding legal limit (MCL)

4

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND140ND
20150.00450 ppm404ND - 0.0590 ppm
20160.00217 ppm242ND - 0.0260 ppm
20170.0224 ppm1410ND - 0.0370 ppm
20180.0643 ppm284ND - 0.500 ppm
2019ND220ND

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
2014-10-27AD98935ND
2014-10-27AD98936ND
2014-10-27AD98937ND
2014-10-27AD98938ND
2014-10-27AD98939ND
2014-10-27AD98940ND
2014-10-27AD98935ND
2014-10-27AD98936ND
2014-10-27AD98937ND
2014-10-27AD98938ND
2014-10-27AD98939ND
2014-10-27AD98940ND
2014-11-03AD99264ND
2014-11-03AD99264ND
2015-02-2335176705001ND
2015-02-2335176705001ND
2015-06-0835192506001ND
2015-06-0835192506001ND
2015-07-2735199527001ND
2015-07-2735199527002ND
2015-07-2735199527003ND
2015-07-2735199527004ND
2015-07-2735199527005ND
2015-07-2735199527001ND
2015-07-2735199527002ND
2015-07-2735199527003ND
2015-07-2735199527004ND
2015-07-2735199527005ND
2015-08-1735203222001ND
2015-08-1735203222002ND
2015-08-1735203222003ND
2015-08-1735203222004ND
2015-08-1735203222005ND
2015-08-1735203222007ND
2015-08-1735203222008ND
2015-08-1735203222009ND
2015-08-17352032220100.0590 ppm
2015-08-17352032220110.0310 ppm
2015-08-1735203222001ND
2015-08-1735203222002ND
2015-08-1735203222003ND
2015-08-1735203222004ND
2015-08-1735203222005ND
2015-08-1735203222007ND
2015-08-1735203222008ND
2015-08-1735203222009ND
2015-08-17352032220100.0590 ppm
2015-08-17352032220110.0310 ppm
2015-11-3035218949003ND
2015-11-3035218949004ND
2015-11-3035218949005ND
2015-11-3035218949003ND
2015-11-3035218949004ND
2015-11-3035218949005ND
2016-03-1435234164005ND
2016-03-1435234164005ND
2016-03-2135235879005ND
2016-03-2135235879005ND
2016-08-0835259258005ND
2016-08-0835259258005ND
2016-08-1535260131001ND
2016-08-1535260131002ND
2016-08-1535260131003ND
2016-08-1535260131004ND
2016-08-1535260131001ND
2016-08-1535260131002ND
2016-08-1535260131003ND
2016-08-1535260131004ND
2016-10-1735271682001ND
2016-10-1735271682002ND
2016-10-17352716820030.0260 ppm
2016-10-1735271682001ND
2016-10-1735271682002ND
2016-10-17352716820030.0260 ppm
2016-12-1235284280001ND
2016-12-1235284280002ND
2016-12-1235284280001ND
2016-12-1235284280002ND
2017-03-08353001570010.0290 ppm
2017-03-08353001570020.0340 ppm
2017-03-08353001570030.0370 ppm
2017-03-08353001570040.0310 ppm
2017-03-08353001570010.0290 ppm
2017-03-08353001570020.0340 ppm
2017-03-08353001570030.0370 ppm
2017-03-08353001570040.0310 ppm
2017-09-25353388550010.0260 ppm
2017-09-25AE18496ND
2017-09-25353388550010.0260 ppm
2017-09-25AE18496ND
2017-11-27AE20049ND
2017-11-27AE20049ND
2018-02-09AE20664ND
2018-02-09AE20665ND
2018-02-09AE20664ND
2018-02-09AE20665ND
2018-03-05AE20853ND
2018-03-05AE20856ND
2018-03-05AE20859ND
2018-03-05AE20862ND
2018-03-05AE20865ND
2018-03-05AE20952ND
2018-03-05AE209530.400 ppm
2018-03-05AE20853ND
2018-03-05AE20856ND
2018-03-05AE20859ND
2018-03-05AE20862ND
2018-03-05AE20865ND
2018-03-05AE20952ND
2018-03-05AE209530.400 ppm
2018-04-30AE216190.500 ppm
2018-04-30AE216190.500 ppm
2018-05-14AE21745ND
2018-05-14AE21745ND
2018-06-18AE21916ND
2018-06-18AE21916ND
2018-06-19AE21919ND
2018-06-19AE21922ND
2018-06-19AE21919ND
2018-06-19AE21922ND
2019-01-1435442884001ND
2019-01-1435442884002ND
2019-01-14B1900254-001ND
2019-01-14B1900254-002ND
2019-01-1435442884001ND
2019-01-1435442884002ND
2019-01-14B1900254-001ND
2019-01-14B1900254-002ND
2019-03-2235457457001ND
2019-03-2235457457002ND
2019-03-2235457457001ND
2019-03-2235457457002ND
2019-08-12B1903460-001ND
2019-08-12B1903460-002ND
2019-08-12B1903460-003ND
2019-08-12B1903460-004ND
2019-08-12B1903460-005ND
2019-08-12B1903460-001ND
2019-08-12B1903460-002ND
2019-08-12B1903460-003ND
2019-08-12B1903460-004ND
2019-08-12B1903460-005ND