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EWG's Tap Water Database — 2019 UPDATE

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1,4-Dioxane

Los Angeles Department of Water and Power

1,4-Dioxane is a solvent classified by the EPA as a likely human carcinogen. It contaminates groundwater in many states due to industrial wastewater discharges, plastic manufacturing runoff and landfill runoff. Read More.

Animal studies show that 1,4-dioxane can target the liver, kidneys and respiratory system, and that prenatal exposure can harm the developing fetus. The State of California has set a Public Heatlh Goal of no more than 1 part per billion of 1,4-dioxane in drinking water. The state of Massachusetts sets a legal limit of 0.3 ppb, and New Hampshire's limit is 3 parts per billion. There is no national drinking water standard for this contaminant.

Click here to read more about 1,4-dioxane.

 

297

Samples

0

Samples exceeding legal limit (MCL)

31

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
20130.0576 ppb407ND - 0.930 ppb
20140.256 ppb328ND - 1.30 ppb
20150.162 ppb729ND - 1.45 ppb
20160.0952 ppb776ND - 1.37 ppb
20170.0964 ppb696ND - 1.27 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 0.35 ppb

The EWG Health Guideline of 0.35 ppb for 1,4-dioxane was defined by the Environmental Protection Agency as a one-in-a-million lifetime risk of cancer. Values greater than one-in-a-million cancer risk level can result in increased cancer cases above one in a million people.

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-181200-205-1200ND
2012-02-021200-133-1000ND
2012-02-141200-011-1020ND
2012-10-021200-205-0945ND
2012-10-101200-205-0855ND
2012-10-231200-205-0845ND
2012-12-141200-205-1540ND
2013-03-061200-205-1015ND
2013-04-031200-205-1050ND
2013-04-09AW06664ND
2013-04-10AW067300.0880 ppb
2013-04-10AW06672ND
2013-04-10AW06676ND
2013-04-10AW067340.0812 ppb
2013-04-11AW06668ND
2013-04-11AW06714ND
2013-04-11AW06726ND
2013-04-11AW06722ND
2013-04-11AW06680ND
2013-04-11AW06718ND
2013-05-081200-205-1210ND
2013-06-061200-205-1010ND
2013-07-031200-133-1015ND
2013-07-031200-205-1125ND
2013-07-24AW14353ND
2013-07-24AW14341ND
2013-07-24AW14345ND
2013-07-24AW143490.317 ppb
2013-07-25AW14479ND
2013-07-25AW144910.328 ppb
2013-07-25AW14483ND
2013-07-25AW14487ND
2013-08-071200-205-1130ND
2013-09-041200-205-1040ND
2013-10-091200-205-1125ND
2013-10-29AW21550ND
2013-10-29AW21558ND
2013-10-29AW21562ND
2013-10-29AW21554ND
2013-10-30AW215840.930 ppb
2013-10-30AW215880.0866 ppb
2013-10-30AW21580ND
2013-10-30AW21576ND
2013-10-31AW21566ND
2013-10-31AW215700.473 ppb
2013-11-061200-205-1050ND
2013-12-041200-205-1230ND
2014-02-051200-205-1130ND
2014-03-051200-205-1140ND
2014-03-18AX05576ND
2014-03-18AX05572ND
2014-03-18AX05578ND
2014-03-19AX056660.362 ppb
2014-03-19AX05670ND
2014-03-19AX05662ND
2014-03-20AX05768ND
2014-03-20AX05776ND
2014-03-20AX05772ND
2014-04-091200-205-1255ND
2014-05-091200-205-0915ND
2014-06-041200-205-1230ND
2014-06-111200-205-1050ND
2014-07-091200-205-1125ND
2014-07-251200-159-10501.08 ppb
2014-08-201200-205-1030ND
2014-08-261200-159-09451.04 ppb
2014-09-031200-205-1225ND
2014-10-081200-133-09001.07 ppb
2014-10-091200-205-1125ND
2014-11-041200-205-1140ND
2014-11-051200-133-08301.23 ppb
2014-11-111200-133-06301.03 ppb
2014-11-111200-159-09051.08 ppb
2014-12-031200-205-1120ND
2014-12-041200-133-0615ND
2014-12-101200-133-0640ND
2014-12-181200-133-0715ND
2014-12-251200-133-0655ND
2014-12-311200-159-12001.30 ppb
2015-01-011200-133-1000ND
2015-01-071200-205-1205ND
2015-01-081200-133-1030ND
2015-01-151200-133-0930ND
2015-01-221200-133-1000ND
2015-01-221200-205-1125ND
2015-01-261200-159-09501.28 ppb
2015-01-291200-133-0915ND
2015-02-051200-133-1030ND
2015-02-051200-205-1235ND
2015-02-121200-133-0625ND
2015-02-191200-133-0740ND
2015-02-241200-159-09401.31 ppb
2015-02-261200-133-0745ND
2015-03-041200-205-1205ND
2015-03-061200-133-0620ND
2015-03-121200-133-0715ND
2015-03-191200-133-0755ND
2015-03-261200-133-0735ND
2015-04-021200-133-0640ND
2015-04-081200-205-1015ND
2015-04-091200-133-0715ND
2015-04-161200-133-0655ND
2015-04-231200-133-0705ND
2015-04-301200-133-0740ND
2015-05-061200-205-1130ND
2015-05-071200-159-11051.45 ppb
2015-05-141200-133-0800ND
2015-05-211200-133-0830ND
2015-05-281200-133-0845ND
2015-06-031200-205-1205ND
2015-06-041200-133-0825ND
2015-06-111200-133-0820ND
2015-06-171200-011-1205ND
2015-06-181200-133-1256ND
2015-06-191200-159-09001.37 ppb
2015-06-251200-133-0750ND
2015-07-081200-205-1130ND
2015-07-161200-159-09501.23 ppb
2015-08-041200-133-0645ND
2015-08-051200-205-1240ND
2015-08-061200-133-1000ND
2015-08-131200-133-0945ND
2015-08-201200-133-1020ND
2015-08-201200-159-10001.43 ppb
2015-08-271200-133-1210ND
2015-09-031200-133-0725ND
2015-09-091200-205-1235ND
2015-09-101200-133-0740ND
2015-09-171200-133-0745ND
2015-09-241200-133-0725ND
2015-09-281200-159-10001.26 ppb
2015-10-011200-133-0725ND
2015-10-061200-205-1215ND
2015-10-101200-133-0950ND
2015-10-151200-133-0710ND
2015-10-201200-205-1155ND
2015-10-221200-133-1200ND
2015-10-291200-133-1130ND
2015-10-301200-159-10501.14 ppb
2015-11-041200-205-1145ND
2015-11-051200-133-1100ND
2015-11-121200-133-1130ND
2015-11-191200-133-1045ND
2015-11-261200-133-1100ND
2015-11-271200-159-09301.22 ppb
2015-12-031200-133-0700ND
2015-12-091200-205-1240ND
2015-12-101200-133-0650ND
2015-12-171200-133-0715ND
2015-12-241200-133-0705ND
2015-12-311200-133-0650ND
2016-01-071200-133-0810ND
2016-01-071200-205-0645ND
2016-01-081200-205-1100ND
2016-01-131200-159-10401.15 ppb
2016-01-141200-133-0730ND
2016-01-141200-205-0910ND
2016-01-211200-133-0710ND
2016-01-211200-205-1145ND
2016-01-281200-133-0950ND
2016-01-281200-205-0900ND
2016-02-041200-133-0630ND
2016-02-041200-205-1120ND
2016-02-111200-133-0735ND
2016-02-111200-205-0750ND
2016-02-181200-133-0745ND
2016-02-231200-133-0730ND
2016-02-271200-159-08401.37 ppb
2016-03-011200-133-0710ND
2016-03-081200-133-1320ND
2016-03-091200-205-1215ND
2016-03-151200-133-0810ND
2016-03-231200-133-1050ND
2016-03-291200-133-0820ND
2016-03-291200-159-10001.21 ppb
2016-04-051200-133-0730ND
2016-04-081200-205-0900ND
2016-04-121200-133-0840ND
2016-04-191200-133-0715ND
2016-04-191200-159-09451.31 ppb
2016-04-261200-133-0835ND
2016-05-031200-133-0745ND
2016-05-101200-133-0740ND
2016-05-121200-205-0840ND
2016-05-171200-133-1100ND
2016-05-241200-133-1205ND
2016-05-261200-159-10151.23 ppb
2016-05-311200-133-1045ND
2016-06-071200-133-0930ND
2016-06-071200-205-1330ND
2016-06-141200-133-0815ND
2016-06-221200-133-0920ND
2016-06-281200-133-1000ND
2016-07-061200-133-0940ND
2016-07-061200-205-1305ND
2016-07-121200-133-1045ND
2016-07-191200-133-1045ND
2016-07-211200-205-1225ND
2016-07-261200-133-1125ND
2016-08-021200-133-0710ND
2016-08-021200-205-0735ND
2016-08-091200-133-1045ND
2016-08-161200-133-1045ND
2016-08-231200-133-1005ND
2016-08-301200-133-0825ND
2016-09-061200-133-1310ND
2016-09-061200-205-0725ND
2016-09-131200-133-0805ND
2016-09-201200-133-0820ND
2016-09-271200-133-0715ND
2016-10-041200-133-1300ND
2016-10-041200-205-0945ND
2016-10-111200-133-1220ND
2016-10-181200-133-0820ND
2016-10-251200-133-1030ND
2016-11-011200-133-0635ND
2016-11-081200-133-0845ND
2016-11-081200-205-0740ND
2016-11-151200-133-0830ND
2016-11-221200-133-1320ND
2016-11-291200-011-0845ND
2016-11-291200-133-0750ND
2016-11-291200-159-10051.06 ppb
2016-12-061200-133-0730ND
2016-12-061200-205-1115ND
2016-12-131200-133-0725ND
2016-12-201200-133-0725ND
2016-12-271200-133-1000ND
2017-01-031200-133-1045ND
2017-01-031200-205-1040ND
2017-01-101200-133-1145ND
2017-01-191200-133-0735ND
2017-01-241200-133-1040ND
2017-01-301200-159-10151.02 ppb
2017-01-311200-133-0815ND
2017-02-071200-205-1150ND
2017-02-141200-133-0730ND
2017-02-161200-159-09401.27 ppb
2017-02-241200-133-0650ND
2017-02-281200-133-0715ND
2017-02-281200-133-1105ND
2017-03-071200-133-0725ND
2017-03-071200-205-1315ND
2017-03-101200-159-09201.22 ppb
2017-03-141200-133-1303ND
2017-03-211200-133-1049ND
2017-03-281200-133-1342ND
2017-04-041200-133-1209ND
2017-04-111200-133-1152ND
2017-04-181200-133-1217ND
2017-04-251200-133-1210ND
2017-05-021200-133-1245ND
2017-05-021200-205-1102ND
2017-05-091200-011-0940ND
2017-05-091200-133-0747ND
2017-05-161200-133-0912ND
2017-05-231200-133-0832ND
2017-05-301200-133-1308ND
2017-06-061200-133-1234ND
2017-06-061200-205-1058ND
2017-06-131200-133-0728ND
2017-06-201200-133-0736ND
2017-06-221200-159-08301.11 ppb
2017-06-271200-133-0936ND
2017-07-041200-133-0805ND
2017-07-041200-205-1014ND
2017-07-101200-159-11351.01 ppb
2017-07-111200-133-0803ND
2017-07-121200-205-1000ND
2017-07-181200-133-0725ND
2017-07-251200-133-0818ND
2017-08-011200-133-0825ND
2017-08-081200-133-1251ND
2017-08-151200-133-0727ND
2017-08-221200-133-0914ND
2017-08-291200-133-0802ND
2017-08-291200-159-12151.02 ppb
2017-09-051200-133-1225ND
2017-09-121200-133-1243ND
2017-09-191200-133-1316ND
2017-09-261200-133-1225ND
2017-09-271200-159-1030ND
2017-10-031200-133-1235ND
2017-10-101200-133-1218ND
2017-10-171200-133-1330ND
2017-10-201200-159-1000ND
2017-10-241200-133-0751ND
2017-10-311200-133-0728ND
2017-11-031200-159-1050ND
2017-11-071200-133-0738ND
2017-11-141200-133-0738ND
2017-11-211200-133-0904ND
2017-11-281200-133-1209ND
2017-12-051200-133-1206ND
2017-12-121200-133-0710ND
2017-12-191200-133-1200ND
2017-12-261200-133-1059ND