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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Plymouth 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.

 

57

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND70ND
20130.0275 ppb82ND - 0.120 ppb
2014ND120ND
2015ND100ND
20160.0160 ppb101ND - 0.160 ppb
2017ND100ND

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 Result
2012-08-17ND
2012-08-17ND
2012-08-17ND
2012-08-17ND
2012-08-17ND
2012-08-17ND
2012-08-17ND
2013-07-110.120 ppb
2013-07-11ND
2013-07-11ND
2013-07-11ND
2013-07-11ND
2013-07-110.1000 ppb
2013-07-11ND
2013-07-11ND
2014-04-29ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-07-02ND
2014-09-11ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2015-07-29ND
2016-08-100.160 ppb
2016-08-10ND
2016-08-10ND
2016-08-10ND
2016-08-10ND
2016-08-10ND
2016-08-10ND
2016-08-10ND
2016-08-10ND
2016-08-10ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND
2017-09-07ND