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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Anaheim

Perchlorate, a component of rocket fuel, occurs both naturally and as a synthetic chemical. Ingested perchlorate interferes with thyroid function. Exposure to perchlorate during pregnancy and childhood can impair cognitive development. Read More.

According to the EPA, perchlorate likely contaminates the water of more than 16 million Americans. Perchlorate interferes with iodine uptake in the thyroid, which can result in reduced thyroid hormones and an impact on metabolism, physical development and cognitive development. Children and developing fetuses are the most at risk from perchlorate contamination.

Perchlorate is the only unregulated contaminant for which the EPA has attempted to set a federal drinking water standard since 1996. However, the agency has yet to propose a draft limit for this contaminant. Perchlorate in drinking water is regulated in Arizona, California, Massachusetts, New Jersey, New York and Texas. California set a public health goal of 1 part per billion for perchlorate in 2015.

Click here to read more about perchlorate.

MORE ABOUT THIS CONTAMINANT

 

207

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
2014ND380ND
2015ND260ND
2016ND330ND
2017ND350ND
2018ND390ND
2019ND360ND

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 1 ppb

The EWG Health Guideline of 1 ppb for perchlorate was defined by the California Office of Environmental Health Hazard Assessment as a public health goal, the level of a drinking water contaminant that does not pose a significant health risk. This health guideline protects against hormone disruption.

ppb = parts per billion

All test results

Date Lab ID Result
2014-01-214417-049-0850ND
2014-01-214417-050-0920ND
2014-01-214417-062-1010ND
2014-01-224417-053-0940ND
2014-01-224417-058-0750ND
2014-01-224417-063-0835ND
2014-01-224417-086-0815ND
2014-01-224417-087-0920ND
2014-01-224417-088-1035ND
2014-04-014417-035-1205ND
2014-04-014417-036-1150ND
2014-04-014417-037-1125ND
2014-04-014417-049-1050ND
2014-04-014417-050-1025ND
2014-04-014417-051-1000ND
2014-04-014417-062-0945ND
2014-04-034417-053-1100ND
2014-04-034417-058-0905ND
2014-04-034417-063-0840ND
2014-04-034417-086-0930ND
2014-04-034417-090-1010ND
2014-06-184417-033-1100ND
2014-06-184417-088-0940ND
2014-07-014417-034-1015ND
2014-07-014417-050-0830ND
2014-07-014417-062-1035ND
2014-07-024417-033-0925ND
2014-07-024417-053-1020ND
2014-07-024417-058-0805ND
2014-07-024417-063-0820ND
2014-07-024417-086-0845ND
2014-08-284417-058-0840ND
2014-08-284417-058-0850ND
2014-10-014417-033-0820ND
2014-10-014417-049-1030ND
2014-10-014417-050-1055ND
2014-10-024417-063-0815ND
2014-10-024417-086-1020ND
2015-01-064417-033-0935ND
2015-01-064417-049-1330ND
2015-01-074417-087-1235ND
2015-03-034417-086-0850ND
2015-04-094417-035-1015ND
2015-04-094417-036-1030ND
2015-04-094417-088-1000ND
2015-04-134417-033-1010ND
2015-04-134417-049-0905ND
2015-04-134417-050-1215ND
2015-04-134417-051-1110ND
2015-04-134417-058-0745ND
2015-04-134417-062-1145ND
2015-04-134417-063-0920ND
2015-04-134417-087-1055ND
2015-04-274417-053-0835ND
2015-04-274417-090-0905ND
2015-07-074417-033-0745ND
2015-07-074417-034-1140ND
2015-07-074417-049-1010ND
2015-07-144417-096-1120ND
2015-08-134417-037-1105ND
2015-10-054417-033-1100ND
2015-10-054417-034-1045ND
2015-10-054417-049-1145ND
2015-10-054417-096-1230ND
2016-01-044417-033-0945ND
2016-01-044417-049-1105ND
2016-01-054417-086-0955ND
2016-01-114417-096-1010ND
2016-02-104417-063-0820ND
2016-04-054417-096-1120ND
2016-04-114417-033-0855ND
2016-04-114417-035-1135ND
2016-04-114417-036-1120ND
2016-04-114417-049-1230ND
2016-04-114417-050-1200ND
2016-04-114417-062-0945ND
2016-04-184417-049-1140ND
2016-04-184417-049-1155ND
2016-04-184417-051-0935ND
2016-04-184417-053-1000ND
2016-04-184417-058-0825ND
2016-04-184417-063-1120ND
2016-04-184417-086-0855ND
2016-04-184417-087-1035ND
2016-04-184417-088-1230ND
2016-04-184417-090-1055ND
2016-07-074417-033-0830ND
2016-07-074417-049-0950ND
2016-07-074417-063-0800ND
2016-07-074417-086-0910ND
2016-07-114417-034-1120ND
2016-07-114417-037-0955ND
2016-07-114417-096-0905ND
2016-10-104417-033-1005ND
2016-10-104417-049-0900ND
2016-10-104417-063-0920ND
2016-10-104417-086-1025ND
2017-01-034417-033-1045ND
2017-01-034417-063-0820ND
2017-01-304417-037-0940ND
2017-01-304417-049-0845ND
2017-03-294417-086-1315ND
2017-04-044417-033-1000ND
2017-04-044417-049-1120ND
2017-04-044417-063-1150ND
2017-04-044417-086-0930ND
2017-04-054417-037-1050ND
2017-04-054417-062-1240ND
2017-04-054417-088-1145ND
2017-04-054417-096-1135ND
2017-04-104417-034-1020ND
2017-04-104417-058-0930ND
2017-04-104417-090-1050ND
2017-04-114417-035-1050ND
2017-04-114417-036-1015ND
2017-04-114417-051-0840ND
2017-04-114417-087-0920ND
2017-06-264417-053-1020ND
2017-07-054417-033-1115ND
2017-07-054417-049-1235ND
2017-07-054417-086-1140ND
2017-07-104417-053-1120ND
2017-07-104417-063-1200ND
2017-07-104417-096-1015ND
2017-10-094417-033-0925ND
2017-10-174417-049-1045ND
2017-10-174417-063-1005ND
2017-10-174417-086-1235ND
2017-10-234417-049-1120ND
2017-11-304417-096-1035ND
2017-12-194417-096-0825ND
2017-12-194417-096-0840ND
2018-01-024417-035-1015ND
2018-01-024417-036-1035ND
2018-01-024417-037-1050ND
2018-01-024417-088-0935ND
2018-01-024417-096-0955ND
2018-01-094417-033-1045ND
2018-01-094417-063-0845ND
2018-01-104417-049-0805ND
2018-01-114417-086-0820ND
2018-04-024417-033-1305ND
2018-04-024417-035-1050ND
2018-04-024417-037-1105ND
2018-04-024417-049-1145ND
2018-04-024417-062-1215ND
2018-04-024417-088-1020ND
2018-04-024417-096-1035ND
2018-04-034417-051-1045ND
2018-04-034417-053-1115ND
2018-04-034417-058-0910ND
2018-04-034417-063-1310ND
2018-04-034417-086-1200ND
2018-04-034417-087-1020ND
2018-04-034417-090-0945ND
2018-05-014417-058-0820ND
2018-05-014417-058-0830ND
2018-07-104417-050-1030ND
2018-07-234417-033-0900ND
2018-07-234417-049-1005ND
2018-07-234417-063-1055ND
2018-07-234417-086-0930ND
2018-07-254417-062-0910ND
2018-07-254417-096-1035ND
2018-08-224417-058-0815ND
2018-10-014417-033-0940ND
2018-10-014417-049-1030ND
2018-10-014417-058-0920ND
2018-10-014417-063-1140ND
2018-10-014417-086-1110ND
2018-10-084417-096-1140ND
2019-01-034417-049-1025ND
2019-01-034417-058-1105ND
2019-01-034417-063-0950ND
2019-01-034417-086-0905ND
2019-01-034417-090-0810ND
2019-01-084417-033-0950ND
2019-01-084417-051-1025ND
2019-01-104417-035-0910ND
2019-01-104417-037-0930ND
2019-01-104417-088-0840ND
2019-01-104417-096-0855ND
2019-03-194417-110-0910ND
2019-03-284417-050-1445ND
2019-04-094417-033-1025ND
2019-04-094417-049-1130ND
2019-04-094417-058-0930ND
2019-04-094417-063-0955ND
2019-04-094417-086-1155ND
2019-04-094417-087-1230ND
2019-04-104417-050-0900ND
2019-04-104417-053-1230ND
2019-04-104417-062-1150ND
2019-04-104417-096-0955ND
2019-04-104417-110-1310ND
2019-07-104417-096-1005ND
2019-08-064417-049-1030ND
2019-08-064417-063-1150ND
2019-08-064417-110-1215ND
2019-09-054417-033-0920ND
2019-09-054417-086-0955ND
2019-10-084417-033-1045ND
2019-10-084417-049-1155ND
2019-10-084417-063-1225ND
2019-10-084417-086-1010ND
2019-10-084417-110-1320ND
2019-10-094417-096-1120ND