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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Fullerton

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

 

105

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
2014ND250ND
2015ND170ND
2016ND170ND
2017ND130ND
2018ND160ND
2019ND170ND

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
2014-02-114417-010-0925ND
2014-02-114417-011-0940ND
2014-02-114417-012-0910ND
2014-02-114417-013-1010ND
2014-02-114417-014-0955ND
2014-02-114417-018-0855ND
2014-03-204417-016-0900ND
2014-06-024417-011-0910ND
2014-06-024417-012-0955ND
2014-06-024417-013-1010ND
2014-06-024417-014-0855ND
2014-06-024417-016-1150ND
2014-06-024417-018-0925ND
2014-06-184417-010-0845ND
2014-06-184417-013-0915ND
2014-06-184417-013-0925ND
2014-08-054417-001-1210ND
2014-08-054417-007-1105ND
2014-08-054417-013-1025ND
2014-08-054417-016-1145ND
2014-08-054417-021-1045ND
2014-09-034417-011-0940ND
2014-11-054417-013-0940ND
2014-11-054417-015-1050ND
2014-11-054417-016-1130ND
2015-02-174417-016-1300ND
2015-05-044417-001-1135ND
2015-05-044417-007-1005ND
2015-05-044417-010-0935ND
2015-05-044417-011-0905ND
2015-05-044417-012-0850ND
2015-05-044417-014-0920ND
2015-05-044417-016-1105ND
2015-05-044417-021-1035ND
2015-06-104417-018-1300ND
2015-08-034417-015-1035ND
2015-08-054417-001-1230ND
2015-08-054417-007-1000ND
2015-08-054417-015-1030ND
2015-08-054417-016-1110ND
2015-08-054417-021-0940ND
2015-11-044417-016-1055ND
2016-02-034417-016-1035ND
2016-05-024417-001-1225ND
2016-05-024417-007-1115ND
2016-05-024417-010-0955ND
2016-05-024417-011-0920ND
2016-05-024417-012-1010ND
2016-05-024417-014-0900ND
2016-05-024417-016-1150ND
2016-05-024417-018-0935ND
2016-05-024417-021-1045ND
2016-06-294417-015-0905ND
2016-06-294417-021-0830ND
2016-08-044417-001-1145ND
2016-08-044417-015-1115ND
2016-08-044417-016-1230ND
2016-08-044417-021-1030ND
2016-11-094417-016-1010ND
2017-02-154417-016-1050ND
2017-05-044417-001-1145ND
2017-05-044417-007-1025ND
2017-05-044417-010-0935ND
2017-05-044417-012-0905ND
2017-05-044417-014-0920ND
2017-05-044417-015-1045ND
2017-05-044417-016-1120ND
2017-05-044417-018-0845ND
2017-05-044417-021-1005ND
2017-05-314417-007-1020ND
2017-08-024417-016-1320ND
2017-10-314417-016-1150ND
2018-02-284417-001-1315ND
2018-02-284417-016-1300ND
2018-03-154417-011-0915ND
2018-05-164417-016-0930ND
2018-05-234417-001-1125ND
2018-05-234417-007-1040ND
2018-05-234417-010-0945ND
2018-05-234417-012-1000ND
2018-05-234417-014-0935ND
2018-05-234417-015-1025ND
2018-05-234417-018-0915ND
2018-05-234417-021-1100ND
2018-08-234417-001-1100ND
2018-08-234417-016-1040ND
2018-11-054417-001-1150ND
2018-11-054417-016-1125ND
2019-03-054417-007-1230ND
2019-03-054417-011-1050ND
2019-03-054417-012-1205ND
2019-03-054417-014-0915ND
2019-03-054417-018-0855ND
2019-03-204417-001-0945ND
2019-03-204417-015-1020ND
2019-03-204417-016-0850ND
2019-04-034417-007-1140ND
2019-04-034417-021-1110ND
2019-04-084417-001-1250ND
2019-04-084417-016-1210ND
2019-07-184417-001-1025ND
2019-07-184417-016-0955ND
2019-10-224417-001-1300ND
2019-10-224417-016-1230ND
2019-11-194417-001-1120ND