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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Montebello Land & 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.

 

37

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
2013ND70ND
2014ND70ND
2015ND30ND
2016ND60ND
2017ND70ND

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
2012-05-172706-001-1035ND
2012-08-202706-005-1140ND
2012-08-202706-003-1130ND
2012-08-202706-004-1215ND
2012-08-202706-007-1150ND
2012-08-202706-008-1225ND
2012-08-202706-009-1200ND
2013-05-212706-001-1200ND
2013-08-122706-008-1210ND
2013-08-122706-005-1230ND
2013-08-122706-004-1220ND
2013-08-122706-003-1240ND
2013-08-122706-009-1255ND
2013-10-282706-007-1500ND
2014-05-232706-001-0855ND
2014-08-222706-005-1035ND
2014-08-222706-009-1145ND
2014-08-222706-004-1000ND
2014-08-222706-008-1100ND
2014-08-222706-003-1015ND
2014-12-222706-007-1057ND
2015-05-292706-001-0900ND
2015-11-242706-007-1011ND
2015-11-242706-004-0950ND
2016-05-259588-001-0815ND
2016-08-259588-008-0835ND
2016-08-259588-005-0820ND
2016-08-259588-004-0825ND
2016-08-259588-003-0845ND
2016-09-269588-007-1015ND
2017-05-229588-001-0910ND
2017-06-149588-009-1025ND
2017-08-309588-004-0830ND
2017-08-309588-003-0905ND
2017-08-309588-005-0915ND
2017-08-309588-007-0935ND
2017-08-309588-008-0850ND