Menu

EWG's Tap Water Database — 2019 UPDATE

Donate

Perchlorate

San Fernando 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.

 

31

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND60ND
2013ND60ND
2014ND100ND
2015ND60ND
2016ND30ND
2017N/A00N/A

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
2012-01-189590-003-1000ND
2012-01-189590-004-0920ND
2012-01-189590-002-1035ND
2012-06-139590-003-0950ND
2012-06-139590-004-0840ND
2012-06-139590-002-0910ND
2013-01-099590-003-0915ND
2013-01-099590-004-0830ND
2013-01-099590-002-0940ND
2013-04-179590-003-0850ND
2013-04-179590-002-0730ND
2013-04-179590-004-0710ND
2014-01-229590-002-0910ND
2014-01-229590-003-0955ND
2014-01-229590-004-0845ND
2014-04-099590-003-1050ND
2014-04-099590-002-0940ND
2014-04-099590-004-0855ND
2014-09-269590-002-0730ND
2014-10-089590-003-1020ND
2014-10-089590-004-0910ND
2014-10-089590-002-0945ND
2015-01-149590-004-0850ND
2015-01-149590-003-1015ND
2015-01-149590-002-0915ND
2015-04-089590-004-0845ND
2015-04-089590-003-1130ND
2015-04-089590-002-1000ND
2016-01-209590-004-0715ND
2016-01-209590-003-1000ND
2016-01-209590-002-0745ND