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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Garden Grove

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

 

198

Samples

0

Samples exceeding legal limit (MCL)

3

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND430ND
2015ND280ND
2016ND270ND
2017ND360ND
20180.256 ppb342ND - 4.60 ppb
20190.137 ppb301ND - 4.10 ppb

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
2014-01-084417-009-0835ND
2014-01-084417-011-1100ND
2014-01-084417-012-0955ND
2014-01-084417-013-1435ND
2014-01-084417-014-0740ND
2014-01-084417-016-1220ND
2014-01-084417-018-1125ND
2014-01-084417-019-0810ND
2014-01-084417-020-0755ND
2014-01-084417-039-1040ND
2014-01-084417-063-1015ND
2014-01-154417-061-0900ND
2014-04-024417-006-1400ND
2014-04-024417-009-0825ND
2014-04-024417-012-0910ND
2014-04-024417-013-1440ND
2014-04-024417-014-0700ND
2014-04-024417-016-1125ND
2014-04-024417-018-1105ND
2014-04-024417-019-0740ND
2014-04-024417-020-0715ND
2014-04-024417-039-1015ND
2014-04-024417-061-0900ND
2014-07-234417-009-0755ND
2014-07-234417-012-0900ND
2014-07-234417-013-1405ND
2014-07-234417-014-0700ND
2014-07-234417-016-1135ND
2014-07-234417-018-1050ND
2014-07-234417-019-0730ND
2014-07-234417-020-0710ND
2014-07-234417-061-0825ND
2014-09-304417-039-1000ND
2014-10-154417-009-0800ND
2014-10-154417-012-0850ND
2014-10-154417-013-1430ND
2014-10-154417-014-0700ND
2014-10-154417-016-1140ND
2014-10-154417-018-1100ND
2014-10-154417-019-0735ND
2014-10-154417-020-0715ND
2014-10-154417-039-0940ND
2014-10-154417-061-0830ND
2015-01-074417-011-1010ND
2015-01-074417-013-1440ND
2015-01-074417-016-1130ND
2015-01-074417-018-1105ND
2015-01-074417-019-0715ND
2015-01-074417-039-1035ND
2015-01-074417-063-0745ND
2015-04-014417-006-1400ND
2015-04-014417-009-0755ND
2015-04-014417-012-0850ND
2015-04-014417-013-1440ND
2015-04-014417-014-0925ND
2015-04-014417-016-1140ND
2015-04-014417-018-1100ND
2015-04-014417-019-0730ND
2015-04-014417-020-0710ND
2015-04-014417-039-1000ND
2015-04-014417-061-0905ND
2015-07-224417-013-1430ND
2015-07-224417-016-1140ND
2015-07-224417-018-1055ND
2015-07-224417-019-0735ND
2015-07-224417-039-0940ND
2015-10-144417-013-1440ND
2015-10-144417-016-1135ND
2015-10-144417-018-1105ND
2015-10-144417-019-0745ND
2015-10-144417-039-0940ND
2016-01-064417-009-0800ND
2016-01-064417-011-1005ND
2016-01-064417-012-0845ND
2016-01-064417-013-1150ND
2016-01-064417-014-0920ND
2016-01-064417-016-1045ND
2016-01-064417-018-1115ND
2016-01-064417-019-0735ND
2016-01-064417-020-0715ND
2016-01-064417-039-0940ND
2016-01-064417-061-0830ND
2016-01-064417-063-0700ND
2016-04-274417-013-1150ND
2016-04-274417-016-1115ND
2016-04-274417-018-1050ND
2016-04-274417-019-0740ND
2016-04-274417-039-0950ND
2016-07-204417-013-1145ND
2016-07-204417-016-1110ND
2016-07-204417-018-1045ND
2016-07-204417-019-0730ND
2016-07-204417-039-0950ND
2016-10-124417-013-1150ND
2016-10-124417-016-1115ND
2016-10-124417-018-1045ND
2016-10-124417-019-0735ND
2016-10-124417-039-0940ND
2017-02-014417-009-0820ND
2017-02-014417-012-0915ND
2017-02-014417-013-1150ND
2017-02-014417-014-0935ND
2017-02-014417-016-1110ND
2017-02-014417-018-1045ND
2017-02-014417-019-0715ND
2017-02-014417-020-0800ND
2017-02-014417-039-1000ND
2017-02-014417-061-0855ND
2017-02-014417-063-0750ND
2017-03-014417-011-1020ND
2017-03-014417-014-0910ND
2017-03-014417-014-0920ND
2017-04-264417-013-1200ND
2017-04-264417-014-0925ND
2017-04-264417-014-0930ND
2017-04-264417-016-1120ND
2017-04-264417-018-1055ND
2017-04-264417-019-0700ND
2017-04-264417-039-0955ND
2017-07-194417-013-1150ND
2017-07-194417-014-0925ND
2017-07-194417-014-0930ND
2017-07-194417-016-1110ND
2017-07-194417-018-1035ND
2017-07-194417-019-0700ND
2017-07-194417-039-0945ND
2017-10-114417-013-1150ND
2017-10-114417-014-0920ND
2017-10-114417-016-1100ND
2017-10-114417-018-1035ND
2017-10-114417-019-0810ND
2017-10-114417-039-0720ND
2017-12-064417-061-0820ND
2017-12-064417-061-0825ND
2018-01-314417-009-0820ND
2018-01-314417-011-0905ND
2018-01-314417-012-0735ND
2018-01-314417-013-1140ND
2018-01-314417-014-0935ND
2018-01-314417-016-1050ND
2018-01-314417-018-1030ND
2018-01-314417-019-0840ND
2018-01-314417-020-1010ND
2018-01-314417-039-0755ND
2018-01-314417-061-0705ND
2018-01-314417-063-0950ND
2018-02-214417-006-0950ND
2018-02-214417-006-1000ND
2018-04-254417-013-1140ND
2018-04-254417-014-0940ND
2018-04-254417-016-1110ND
2018-04-254417-018-1045ND
2018-04-254417-019-0815ND
2018-04-254417-039-0730ND
2018-07-184417-013-1130ND
2018-07-184417-014-0915ND
2018-07-184417-016-1105ND
2018-07-184417-018-1030ND
2018-07-184417-019-08104.60 ppb
2018-07-184417-039-0715ND
2018-08-064417-019-08454.10 ppb
2018-08-064417-019-0850ND
2018-10-104417-013-1135ND
2018-10-104417-014-0925ND
2018-10-104417-016-1110ND
2018-10-104417-018-1045ND
2018-10-104417-019-0830ND
2018-10-104417-039-0720ND
2019-01-304417-009-0805ND
2019-01-304417-011-0835ND
2019-01-304417-012-0740ND
2019-01-304417-013-1135ND
2019-01-304417-014-0910ND
2019-01-304417-016-1015ND
2019-01-304417-018-1110ND
2019-01-304417-019-0945ND
2019-01-304417-020-0920ND
2019-01-304417-039-0715ND
2019-01-304417-061-0700ND
2019-04-244417-013-1125ND
2019-04-244417-014-0935ND
2019-04-244417-016-1055ND
2019-04-244417-018-1025ND
2019-04-244417-019-0845ND
2019-04-244417-039-0725ND
2019-07-174417-013-0845ND
2019-07-174417-014-0945ND
2019-07-174417-016-1110ND
2019-07-174417-018-1050ND
2019-07-174417-019-0825ND
2019-07-174417-039-0715ND
2019-11-064417-013-0905ND
2019-11-064417-014-1000ND
2019-11-064417-016-1125ND
2019-11-064417-018-1110ND
2019-11-064417-019-08454.10 ppb
2019-11-064417-039-0755ND
2019-11-064417-063-1020ND