Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Perchlorate

Glendale Water Department

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.

 

27

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND40ND
2013ND70ND
2014ND60ND
2015ND40ND
2016ND40ND
2017ND20ND

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
2012-01-109590-069-0905ND
2012-04-119590-069-0940ND
2012-07-119590-069-0746ND
2012-08-099590-020-0920ND
2013-04-179590-020-0920ND
2013-05-159590-069-0741ND
2013-07-109590-069-0904ND
2013-08-149590-069-0823ND
2013-10-099590-069-0945ND
2013-11-139590-069-1046ND
2013-12-119590-069-0850ND
2014-01-159590-069-1010ND
2014-02-129590-069-1048ND
2014-03-129590-069-1054ND
2014-04-099590-069-1040ND
2014-07-099590-069-0923ND
2014-10-149590-069-1223ND
2015-01-149590-069-0941ND
2015-04-159590-069-0811ND
2015-07-159590-069-0957ND
2015-10-149590-069-0903ND
2016-01-139590-069-0931ND
2016-04-139590-069-1057ND
2016-07-139590-069-1017ND
2016-10-139590-069-1027ND
2017-01-129588-069-1003ND
2017-06-129588-069-0847ND