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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Sunny Slope Water Company

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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND50ND
2013ND50ND
2014ND30ND
2015ND80ND
2016ND50ND
2017ND50ND

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
2012-09-129588-004-0920ND
2012-09-129588-017-0950ND
2012-09-129588-012-0910ND
2012-09-129588-003-0930ND
2012-11-299588-006-0945ND
2013-09-039588-004-1027ND
2013-09-039588-003-0955ND
2013-09-039588-017-1007ND
2013-09-039588-012-0900ND
2013-12-179588-006-0900ND
2014-09-169588-003-0925ND
2014-09-169588-004-0920ND
2014-12-019588-006-0910ND
2015-06-099588-017-1010ND
2015-09-029588-003-0935ND
2015-09-029588-004-0925ND
2015-09-029588-012-0955ND
2015-12-099588-004-0930ND
2015-12-099588-006-0910ND
2015-12-099588-017-0940ND
2015-12-099588-003-0920ND
2016-06-089588-017-1030ND
2016-09-129588-012-0905ND
2016-09-129588-003-0930ND
2016-09-129588-004-0935ND
2016-12-029588-006-1040ND
2017-06-309588-017-1335ND
2017-09-219588-003-0930ND
2017-09-219588-004-0935ND
2017-09-219588-012-0945ND
2017-12-289588-006-0835ND