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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Kingston 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.

 

40

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20120.0827 ppb75ND - 0.247 ppb
20130.0680 ppb74ND - 0.211 ppb
20140.0623 ppb74ND - 0.181 ppb
20150.102 ppb76ND - 0.220 ppb
20160.0900 ppb64ND - 0.210 ppb
20170.0983 ppb65ND - 0.220 ppb

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
2012-04-260.114 ppb
2012-07-240.0540 ppb
2012-07-24ND
2012-07-24ND
2012-07-240.0670 ppb
2012-07-240.0970 ppb
2012-07-240.247 ppb
2013-09-19ND
2013-09-19ND
2013-09-190.109 ppb
2013-09-190.0710 ppb
2013-09-190.0850 ppb
2013-09-190.211 ppb
2013-09-19ND
2014-09-09ND
2014-09-09ND
2014-09-090.105 ppb
2014-09-090.0840 ppb
2014-09-090.0660 ppb
2014-09-090.181 ppb
2014-09-09ND
2015-08-28ND
2015-08-280.160 ppb
2015-08-280.0970 ppb
2015-08-280.0790 ppb
2015-08-280.108 ppb
2015-08-280.220 ppb
2015-08-280.0500 ppb
2016-08-250.0800 ppb
2016-08-250.180 ppb
2016-08-250.210 ppb
2016-08-25ND
2016-08-25ND
2016-08-250.0700 ppb
2017-08-030.120 ppb
2017-08-030.0900 ppb
2017-08-030.110 ppb
2017-08-030.220 ppb
2017-08-030.0500 ppb
2017-08-03ND