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EWG's Tap Water Database — 2021 UPDATE

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Nitrite

Los Angeles Department of Water and Power

Nitrite, closely related to the fertilizer chemical nitrate, comes from urban runoff and from fertilizer applied to agricultural lands to pollute drinking water. Nitrite is significantly more toxic than nitrate. Excessive nitrite in water can cause oxygen deprivation in infants and increase the risk of cancer.

MORE ABOUT THIS CONTAMINANT

 

301

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND390ND
2015ND440ND
2016ND460ND
2017ND610ND
2018ND550ND
20190.00164 ppm567ND - 0.0284 ppm

ppm = parts per million

State and national drinking water standards and health guidelines

EPA Maximum Contaminant
Level (MCL) 1 ppm

The legal limit for nitrite, established in 1991, was based on the rate of conversion of ingested nitrate into nitrite in adults. This limit may not fully protect against the risk of cancer due to nitrite exposure.

ppm = parts per million

All test results

Date Lab ID Result
2014-02-261200-011-1215ND
2014-02-261200-133-1215ND
2014-04-241200-133-0635ND
2014-05-011200-133-0725ND
2014-05-141200-011-1115ND
2014-05-141200-133-1105ND
2014-05-151200-133-0635ND
2014-05-291200-133-0735ND
2014-06-121200-133-1000ND
2014-06-191200-133-1000ND
2014-06-261200-133-0800ND
2014-07-031200-133-1155ND
2014-07-101200-133-1045ND
2014-07-171200-133-0800ND
2014-07-241200-133-1115ND
2014-07-311200-133-0750ND
2014-08-071200-133-0750ND
2014-08-121200-011-1030ND
2014-08-141200-133-0740ND
2014-08-201200-133-0900ND
2014-08-211200-133-0735ND
2014-08-281200-133-0725ND
2014-09-041200-133-0705ND
2014-09-111200-133-0720ND
2014-09-181200-133-0650ND
2014-09-251200-133-0645ND
2014-10-021200-133-0700ND
2014-10-091200-133-0740ND
2014-10-161200-133-0635ND
2014-10-231200-133-0645ND
2014-10-301200-133-0715ND
2014-11-061200-133-0620ND
2014-11-121200-011-1240ND
2014-11-131200-133-0645ND
2014-11-181200-133-0935ND
2014-11-201200-133-0700ND
2014-11-261200-133-1100ND
2014-12-111200-133-0655ND
2014-12-261200-133-1015ND
2015-01-081200-133-1030ND
2015-01-221200-133-1000ND
2015-02-051200-133-1030ND
2015-02-111200-133-0825ND
2015-02-191200-011-0845ND
2015-02-191200-133-0740ND
2015-03-051200-133-0710ND
2015-03-191200-133-0755ND
2015-04-021200-133-0640ND
2015-04-161200-133-0655ND
2015-04-301200-133-0740ND
2015-05-141200-133-0800ND
2015-05-191200-011-0900ND
2015-05-191200-133-1100ND
2015-05-281200-133-0845ND
2015-06-111200-133-0820ND
2015-06-251200-133-0750ND
2015-08-041200-011-1040ND
2015-08-041200-133-0645ND
2015-08-061200-133-1000ND
2015-08-131200-133-0945ND
2015-08-201200-133-1020ND
2015-08-271200-133-1210ND
2015-09-031200-133-0725ND
2015-09-101200-133-0740ND
2015-09-171200-133-0745ND
2015-09-241200-133-0725ND
2015-10-011200-133-0725ND
2015-10-081200-133-0725ND
2015-10-151200-133-0710ND
2015-10-201200-205-1155ND
2015-10-221200-133-1200ND
2015-10-291200-133-1130ND
2015-11-051200-011-1005ND
2015-11-051200-133-0755ND
2015-11-051200-133-1100ND
2015-11-121200-133-1130ND
2015-11-191200-133-1045ND
2015-11-251200-133-0720ND
2015-12-031200-133-0700ND
2015-12-101200-133-0650ND
2015-12-171200-133-0715ND
2015-12-231200-133-0650ND
2015-12-311200-133-0650ND
2016-01-071200-133-0810ND
2016-01-211200-133-0710ND
2016-02-241200-011-1215ND
2016-03-031200-133-0700ND
2016-03-171200-133-0900ND
2016-03-311200-133-0725ND
2016-04-141200-133-1100ND
2016-04-281200-133-1130ND
2016-05-121200-133-1100ND
2016-05-251200-011-1135ND
2016-05-251200-133-1210ND
2016-05-261200-133-0655ND
2016-06-091200-133-0645ND
2016-06-161200-133-0650ND
2016-06-231200-133-1050ND
2016-06-301200-133-0645ND
2016-07-071200-133-0645ND
2016-07-141200-133-0645ND
2016-07-211200-205-1225ND
2016-07-281200-133-0815ND
2016-08-041200-133-0645ND
2016-08-111200-133-0645ND
2016-08-171200-011-1010ND
2016-08-181200-133-1220ND
2016-08-231200-133-1005ND
2016-08-251200-133-1130ND
2016-09-011200-133-1100ND
2016-09-081200-133-1130ND
2016-09-151200-133-1300ND
2016-09-221200-133-1200ND
2016-09-291200-133-1220ND
2016-10-061200-133-0710ND
2016-10-131200-133-0800ND
2016-10-201200-133-1200ND
2016-10-271200-133-1050ND
2016-11-031200-133-1300ND
2016-11-101200-133-0830ND
2016-11-171200-133-0720ND
2016-11-211200-133-1115ND
2016-11-231200-133-0725ND
2016-11-291200-011-0845ND
2016-12-011200-133-0735ND
2016-12-081200-133-0720ND
2016-12-151200-133-0705ND
2016-12-221200-133-0640ND
2016-12-291200-133-1205ND
2017-01-051200-133-0740ND
2017-01-121200-133-0730ND
2017-01-191200-133-0735ND
2017-01-261200-133-0850ND
2017-02-021200-133-0705ND
2017-02-091200-133-0710ND
2017-02-161200-133-0710ND
2017-02-211200-011-1140ND
2017-02-211200-133-1210ND
2017-02-231200-133-0735ND
2017-03-021200-133-0810ND
2017-03-091200-133-0720ND
2017-03-161200-133-0730ND
2017-03-231200-133-0830ND
2017-03-301200-133-0714ND
2017-04-061200-133-0725ND
2017-04-131200-133-0653ND
2017-04-201200-133-0713ND
2017-04-271200-133-0705ND
2017-05-041200-133-1200ND
2017-05-091200-011-0940ND
2017-05-111200-133-1108ND
2017-05-171200-133-0941ND
2017-05-181200-133-1106ND
2017-05-251200-133-1100ND
2017-06-011200-133-0940ND
2017-06-081200-133-1206ND
2017-06-151200-133-0645ND
2017-06-221200-133-0711ND
2017-06-291200-133-0642ND
2017-07-061200-133-0803ND
2017-07-121200-205-1000ND
2017-07-131200-133-0808ND
2017-07-201200-133-0859ND
2017-07-271200-133-0800ND
2017-08-011200-133-0940ND
2017-08-031200-133-0817ND
2017-08-101200-133-1310ND
2017-08-171200-133-0737ND
2017-08-211200-011-1010ND
2017-08-241200-133-0740ND
2017-08-311200-133-1146ND
2017-09-071200-133-0818ND
2017-09-141200-133-0857ND
2017-09-211200-133-0749ND
2017-09-281200-133-0752ND
2017-10-051200-133-0753ND
2017-10-121200-133-0751ND
2017-10-191200-133-1134ND
2017-10-261200-133-0732ND
2017-11-021200-133-0753ND
2017-11-091200-133-0810ND
2017-11-161200-133-0740ND
2017-11-201200-011-1000ND
2017-11-201200-133-1040ND
2017-11-201200-133-1410ND
2017-11-301200-133-0717ND
2017-12-071200-133-0651ND
2017-12-141200-133-0936ND
2017-12-211200-133-0920ND
2017-12-281200-133-0738ND
2018-01-041200-133-0840ND
2018-01-111200-133-1142ND
2018-01-181200-133-1211ND
2018-01-251200-133-1015ND
2018-02-011200-133-1031ND
2018-02-061200-011-1040ND
2018-02-071200-133-0930ND
2018-02-081200-133-1213ND
2018-02-151200-133-1148ND
2018-02-221200-133-0844ND
2018-03-011200-133-0653ND
2018-03-081200-133-0800ND
2018-03-151200-133-0657ND
2018-03-221200-133-0725ND
2018-03-291200-133-0913ND
2018-04-051200-133-1123ND
2018-04-121200-133-1124ND
2018-04-201200-133-0658ND
2018-04-271200-133-0654ND
2018-05-041200-133-0913ND
2018-05-081200-133-0736ND
2018-05-111200-133-1100ND
2018-05-181200-133-1025ND
2018-05-231200-011-0925ND
2018-05-251200-133-1320ND
2018-06-011200-133-1139ND
2018-06-081200-133-1130ND
2018-06-151200-133-0946ND
2018-06-221200-133-1151ND
2018-06-291200-133-0829ND
2018-07-061200-133-0638ND
2018-07-131200-133-1120ND
2018-07-201200-133-0705ND
2018-07-271200-133-0720ND
2018-08-031200-133-0645ND
2018-08-101200-133-0855ND
2018-08-161200-011-0940ND
2018-08-161200-133-0747ND
2018-08-171200-133-0705ND
2018-08-241200-133-0937ND
2018-08-311200-133-1053ND
2018-09-071200-133-1010ND
2018-09-141200-133-1000ND
2018-09-211200-133-0747ND
2018-09-281200-133-0714ND
2018-10-051200-133-0737ND
2018-10-121200-133-0701ND
2018-10-191200-133-0657ND
2018-10-261200-133-0707ND
2018-11-061200-011-0842ND
2018-11-151200-133-0917ND
2018-12-071200-133-1031ND
2018-12-141200-133-1030ND
2018-12-211200-133-0804ND
2018-12-271200-133-1445ND
2019-01-041200-133-0654ND
2019-01-111200-133-0645ND
2019-01-181200-133-0807ND
2019-01-251200-133-0744ND
2019-02-011200-133-0726ND
2019-02-081200-133-0729ND
2019-02-111200-133-1011ND
2019-02-131200-011-1115ND
2019-02-151200-133-0801ND
2019-02-221200-133-1030ND
2019-03-011200-133-0717ND
2019-03-081200-133-0653ND
2019-03-151200-133-12090.00662 ppm
2019-03-221200-133-0748ND
2019-03-291200-133-0656ND
2019-04-051200-133-0659ND
2019-04-121200-133-0825ND
2019-04-191200-133-1010ND
2019-04-261200-133-0953ND
2019-05-031200-133-11380.0234 ppm
2019-05-101200-133-0835ND
2019-05-171200-133-1129ND
2019-05-211200-011-1012ND
2019-05-221200-133-0945ND
2019-05-241200-133-1047ND
2019-05-311200-133-1041ND
2019-06-071200-133-1136ND
2019-06-141200-133-0824ND
2019-06-211200-133-09480.01000 ppm
2019-06-281200-133-0837ND
2019-07-051200-133-07540.00849 ppm
2019-07-121200-133-1023ND
2019-07-191200-133-1047ND
2019-07-261200-133-1047ND
2019-08-021200-133-0906ND
2019-08-091200-133-10530.00563 ppm
2019-08-121200-011-1028ND
2019-08-131200-133-0907ND
2019-08-161200-133-1051ND
2019-08-231200-133-1043ND
2019-08-301200-133-0655ND
2019-09-061200-133-0845ND
2019-09-131200-133-1259ND
2019-09-201200-133-07470.00903 ppm
2019-09-271200-133-0649ND
2019-10-041200-133-1202ND
2019-10-111200-133-1151ND
2019-10-181200-133-1208ND
2019-10-251200-133-1239ND
2019-11-011200-133-1237ND
2019-11-071200-011-0958ND
2019-11-071200-133-0852ND
2019-11-081200-133-1214ND
2019-11-151200-133-0647ND
2019-11-221200-133-12100.0284 ppm
2019-11-271200-133-0921ND