Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

1,4-Dioxane

Monterey Park Water Department

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.

 

345

Samples

0

Samples exceeding legal limit (MCL)

89

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.636 ppb4722ND - 2.80 ppb
20130.198 ppb548ND - 1.60 ppb
20140.321 ppb5612ND - 2.80 ppb
20150.369 ppb4813ND - 2.20 ppb
20160.303 ppb7217ND - 1.70 ppb
20170.293 ppb6817ND - 1.40 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
2012-01-099588-006-07351.20 ppb
2012-01-099588-043-07401.10 ppb
2012-01-099588-085-07301.10 ppb
2012-01-119588-002-0955ND
2012-01-119588-002-1005ND
2012-01-119588-010-0905ND
2012-01-119588-011-0945ND
2012-01-119588-013-08351.80 ppb
2012-01-119588-038-08551.20 ppb
2012-01-119588-067-1215ND
2012-01-119588-068-12451.10 ppb
2012-04-039588-006-1140ND
2012-04-039588-010-1040ND
2012-04-039588-013-10101.70 ppb
2012-04-039588-038-09301.10 ppb
2012-04-039588-043-1225ND
2012-04-039588-085-1230ND
2012-06-129588-043-10151.80 ppb
2012-06-129588-068-11151.20 ppb
2012-06-129588-085-11001.40 ppb
2012-07-109588-006-11301.30 ppb
2012-07-109588-010-1045ND
2012-07-109588-013-10252.80 ppb
2012-07-109588-043-11451.30 ppb
2012-07-109588-068-12451.000 ppb
2012-07-109588-085-1230ND
2012-07-159588-038-11151.70 ppb
2012-08-099588-043-06501.20 ppb
2012-08-099588-068-06251.000 ppb
2012-08-099588-085-06451.10 ppb
2012-08-149588-002-1005ND
2012-09-049588-043-08051.000 ppb
2012-09-049588-068-0910ND
2012-09-049588-085-0810ND
2012-10-089588-010-0840ND
2012-10-089588-013-07301.70 ppb
2012-10-089588-038-08101.10 ppb
2012-11-059588-001-0900ND
2012-11-059588-006-0940ND
2012-11-059588-006-1025ND
2012-11-059588-011-0930ND
2012-11-059588-043-1020ND
2012-11-059588-068-0800ND
2012-11-059588-085-1015ND
2012-12-049588-043-1249ND
2012-12-049588-068-1310ND
2012-12-049588-085-1255ND
2013-01-089588-006-0650ND
2013-01-089588-010-1015ND
2013-01-089588-013-10151.50 ppb
2013-01-089588-038-1030ND
2013-01-089588-043-0705ND
2013-01-089588-085-0805ND
2013-02-059588-043-0725ND
2013-02-059588-068-0815ND
2013-02-059588-085-0807ND
2013-03-269588-043-0845ND
2013-03-269588-068-08551.10 ppb
2013-03-269588-085-0850ND
2013-04-029588-006-0800ND
2013-04-029588-010-1115ND
2013-04-029588-013-11551.60 ppb
2013-04-029588-038-1130ND
2013-04-029588-043-0827ND
2013-04-029588-085-0830ND
2013-05-069588-043-0830ND
2013-05-069588-068-07001.20 ppb
2013-05-069588-085-0710ND
2013-06-049588-043-1145ND
2013-06-049588-068-1010ND
2013-06-049588-085-1040ND
2013-07-089588-006-0955ND
2013-07-089588-010-0705ND
2013-07-089588-013-07101.60 ppb
2013-07-089588-038-0740ND
2013-07-089588-043-1110ND
2013-07-089588-068-1130ND
2013-07-089588-085-1120ND
2013-08-069588-043-1200ND
2013-08-069588-068-0925ND
2013-08-069588-085-1205ND
2013-08-209588-002-0935ND
2013-09-099588-043-10051.20 ppb
2013-09-099588-068-10251.000 ppb
2013-09-099588-085-1015ND
2013-10-019588-006-1010ND
2013-10-019588-010-0800ND
2013-10-019588-013-07301.50 ppb
2013-10-019588-038-0720ND
2013-10-019588-043-1100ND
2013-10-019588-068-1130ND
2013-10-019588-085-1115ND
2013-11-059588-043-1114ND
2013-11-059588-068-0810ND
2013-11-059588-085-1117ND
2013-11-199588-001-0905ND
2013-11-199588-006-1050ND
2013-11-199588-011-1120ND
2013-12-109588-043-1105ND
2013-12-109588-068-1005ND
2013-12-109588-085-1110ND
2014-01-149588-006-1000ND
2014-01-149588-043-1010ND
2014-01-149588-085-0950ND
2014-01-159588-010-0810ND
2014-01-159588-013-08202.80 ppb
2014-01-159588-038-07252.20 ppb
2014-02-039588-043-0850ND
2014-02-039588-068-0945ND
2014-02-039588-085-0855ND
2014-03-049588-043-0000ND
2014-03-049588-068-00001.20 ppb
2014-03-049588-085-0000ND
2014-04-019588-006-0000ND
2014-04-019588-043-0000ND
2014-04-019588-068-0000ND
2014-04-019588-085-0000ND
2014-04-089588-010-0945ND
2014-04-089588-013-0820ND
2014-04-089588-038-08401.40 ppb
2014-05-069588-043-0805ND
2014-05-069588-068-0820ND
2014-05-069588-085-0810ND
2014-06-039588-043-0810ND
2014-06-039588-068-0830ND
2014-06-039588-085-0815ND
2014-07-089588-006-0000ND
2014-07-089588-010-0000ND
2014-07-089588-013-00001.70 ppb
2014-07-089588-038-00001.10 ppb
2014-07-089588-043-0000ND
2014-07-089588-068-0000ND
2014-07-089588-081-15151.40 ppb
2014-07-089588-085-0000ND
2014-08-059588-043-0858ND
2014-08-059588-068-1020ND
2014-08-059588-085-0903ND
2014-08-219588-002-0945ND
2014-09-029588-043-1010ND
2014-09-029588-068-10251.10 ppb
2014-09-049588-085-1000ND
2014-10-089588-006-0700ND
2014-10-089588-010-1000ND
2014-10-089588-013-10251.70 ppb
2014-10-089588-038-10101.10 ppb
2014-10-089588-043-0750ND
2014-10-089588-068-0810ND
2014-10-089588-085-0800ND
2014-11-059588-001-1300ND
2014-11-059588-006-1405ND
2014-11-059588-011-1340ND
2014-11-059588-043-0815ND
2014-11-059588-068-08251.20 ppb
2014-11-059588-085-0820ND
2014-12-039588-043-0720ND
2014-12-039588-068-07501.10 ppb
2014-12-039588-085-0740ND
2015-01-139588-010-1145ND
2015-01-139588-013-12051.60 ppb
2015-01-139588-038-11551.10 ppb
2015-01-149588-006-0750ND
2015-01-149588-043-0755ND
2015-01-149588-068-0910ND
2015-01-149588-085-0850ND
2015-02-039588-043-0750ND
2015-02-039588-068-0948ND
2015-02-039588-085-0753ND
2015-02-265B26032-03A0.390 ppb
2015-02-265B26032-01A0.840 ppb
2015-03-039588-043-0739ND
2015-03-039588-068-0819ND
2015-03-039588-085-0815ND
2015-04-069588-010-1030ND
2015-04-069588-013-09001.80 ppb
2015-04-069588-038-09201.30 ppb
2015-04-079588-006-0700ND
2015-04-079588-043-0750ND
2015-04-079588-068-08101.10 ppb
2015-04-079588-085-0755ND
2015-05-049588-043-1220ND
2015-05-049588-043-1230ND
2015-05-049588-068-13251.10 ppb
2015-06-039588-043-1115ND
2015-06-039588-068-1135ND
2015-06-039588-085-1030ND
2015-07-079588-006-1459ND
2015-07-079588-010-0912ND
2015-07-079588-013-08402.20 ppb
2015-07-079588-043-1459ND
2015-07-079588-068-14591.30 ppb
2015-07-079588-085-1459ND
2015-08-039588-043-1015ND
2015-08-039588-068-1040ND
2015-08-039588-085-1025ND
2015-08-079588-038-07502.20 ppb
2015-08-259588-002-1010ND
2015-09-019588-043-0955ND
2015-09-019588-068-10401.50 ppb
2015-09-019588-085-1000ND
2015-11-109588-001-1005ND
2015-11-109588-006-1100ND
2015-11-109588-011-1115ND
2015-12-029588-043-0855ND
2015-12-029588-068-09051.30 ppb
2015-12-029588-085-0940ND
2016-01-049588-001-0925ND
2016-01-049588-002-0945ND
2016-01-049588-006-0855ND
2016-01-049588-010-0416ND
2016-01-049588-011-1005ND
2016-01-049588-013-10201.70 ppb
2016-01-049588-038-10101.30 ppb
2016-01-049588-043-0930ND
2016-01-049588-067-0915ND
2016-01-049588-068-10201.000 ppb
2016-01-049588-085-0947ND
2016-02-029588-043-0900ND
2016-02-029588-068-1048ND
2016-02-029588-085-0830ND
2016-03-029588-043-0922ND
2016-03-029588-068-10001.40 ppb
2016-03-029588-085-0845ND
2016-04-059590-006-0755ND
2016-04-059590-010-1205ND
2016-04-059590-013-11251.30 ppb
2016-04-059590-038-11001.20 ppb
2016-04-059590-043-0740ND
2016-04-059590-068-0930ND
2016-04-059590-068-1040ND
2016-04-059590-081-10351.10 ppb
2016-04-059590-085-0845ND
2016-04-069590-001-0715ND
2016-04-069590-002-0905ND
2016-04-069590-011-0930ND
2016-04-069590-067-0845ND
2016-04-069590-068-0850ND
2016-05-109590-043-1125ND
2016-05-109590-068-1010ND
2016-05-109590-085-1135ND
2016-07-059590-006-0820ND
2016-07-059590-010-1140ND
2016-07-059590-013-09401.40 ppb
2016-07-059590-038-11551.000 ppb
2016-07-059590-043-0830ND
2016-07-059590-068-09001.20 ppb
2016-07-059590-068-11301.30 ppb
2016-07-059590-081-10301.30 ppb
2016-07-059590-085-0805ND
2016-07-069590-001-0900ND
2016-07-069590-002-1100ND
2016-07-069590-011-0800ND
2016-07-069590-067-1030ND
2016-07-069590-068-1045ND
2016-08-029590-043-1130ND
2016-08-029590-068-0920ND
2016-08-119588-002-0920ND
2016-10-049590-006-0800ND
2016-10-049590-010-1150ND
2016-10-049590-013-11101.40 ppb
2016-10-049590-043-0820ND
2016-10-049590-068-0920ND
2016-10-049590-068-1300ND
2016-10-049590-081-12201.40 ppb
2016-10-049590-085-0740ND
2016-10-059590-001-1020ND
2016-10-059590-002-1050ND
2016-10-059590-011-1110ND
2016-10-059590-067-1000ND
2016-10-059590-068-1030ND
2016-10-189590-038-07501.20 ppb
2016-11-029590-043-1345ND
2016-11-029590-068-13451.50 ppb
2016-11-029590-085-1310ND
2016-11-149588-001-0920ND
2016-11-149588-006-0945ND
2016-11-149588-011-1000ND
2016-11-229590-068-08511.10 ppb
2017-01-109590-001-0910ND
2017-01-109590-002-0810ND
2017-01-109590-006-1220ND
2017-01-109590-010-1035ND
2017-01-109590-011-0835ND
2017-01-109590-013-09501.20 ppb
2017-01-109590-038-09301.000 ppb
2017-01-109590-043-1240ND
2017-01-109590-067-0935ND
2017-01-109590-068-0755ND
2017-01-109590-068-1050ND
2017-01-109590-068-1330ND
2017-01-109590-081-08351.20 ppb
2017-01-109590-085-1200ND
2017-02-089590-043-0845ND
2017-02-089590-068-0905ND
2017-02-089590-085-0850ND
2017-03-079590-043-1020ND
2017-03-079590-068-0820ND
2017-03-079590-085-1005ND
2017-04-039590-010-1000ND
2017-04-039590-013-10251.30 ppb
2017-04-039590-038-08551.000 ppb
2017-04-039590-068-11101.000 ppb
2017-04-039590-081-12201.10 ppb
2017-04-049590-001-0940ND
2017-04-049590-002-0850ND
2017-04-049590-006-0835ND
2017-04-049590-011-0750ND
2017-04-049590-043-0955ND
2017-04-049590-067-1020ND
2017-04-049590-068-1050ND
2017-04-049590-068-1150ND
2017-04-049590-085-1035ND
2017-07-119590-001-0910ND
2017-07-119590-010-1145ND
2017-07-119590-011-1000ND
2017-07-119590-013-11101.40 ppb
2017-07-119590-038-11281.20 ppb
2017-07-119590-067-0830ND
2017-07-119590-068-0930ND
2017-07-119590-068-0940ND
2017-07-119590-081-12101.30 ppb
2017-08-159590-002-0835ND
2017-08-159588-002-0915ND
2017-10-139590-043-1010ND
2017-10-139590-068-10401.10 ppb
2017-10-139590-085-1020ND
2017-11-079590-006-1300ND
2017-11-079590-010-0945ND
2017-11-079590-013-08051.30 ppb
2017-11-079590-038-09001.30 ppb
2017-11-079590-043-1320ND
2017-11-079590-068-11201.10 ppb
2017-11-079590-068-14001.000 ppb
2017-11-079590-081-10201.30 ppb
2017-11-079590-085-1245ND
2017-11-089590-001-0950ND
2017-11-089590-002-0805ND
2017-11-089590-011-0810ND
2017-11-089590-067-0930ND
2017-11-089590-068-1010ND
2017-11-099588-001-0905ND
2017-11-099588-006-0930ND
2017-11-099588-011-0940ND
2017-12-059590-043-1045ND
2017-12-069590-068-07301.10 ppb
2017-12-069590-085-0800ND