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EWG's Tap Water Database — 2019 UPDATE

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Perchlorate

Rowland Water District

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.

 

67

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2012ND120ND
2013ND110ND
2014ND100ND
2015ND120ND
2016ND110ND
2017ND110ND

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
2012-01-173761-003-0832ND
2012-02-213761-003-0850ND
2012-03-193761-003-0813ND
2012-04-163761-003-0820ND
2012-05-213761-003-0944ND
2012-06-183761-003-0827ND
2012-07-163761-003-1000ND
2012-08-203761-003-0849ND
2012-09-173761-003-0831ND
2012-10-153761-003-0917ND
2012-11-193761-003-0800ND
2012-12-173761-003-0845ND
2013-01-223761-003-0930ND
2013-03-183761-003-0920ND
2013-04-153761-003-0830ND
2013-05-203761-003-0915ND
2013-06-173761-003-0839ND
2013-07-153761-003-0807ND
2013-08-193761-003-0903ND
2013-09-163761-003-0905ND
2013-10-213761-003-0942ND
2013-11-183761-003-0830ND
2013-12-163761-003-0830ND
2014-01-213761-003-1040ND
2014-02-183761-003-0915ND
2014-04-213761-003-0840ND
2014-05-193761-003-0925ND
2014-06-163761-003-0815ND
2014-07-213761-003-0835ND
2014-08-183761-003-0835ND
2014-09-153761-003-0920ND
2014-11-243761-003-0950ND
2014-12-153761-003-0930ND
2015-01-203761-003-1015ND
2015-02-173761-003-0930ND
2015-03-163761-003-0750ND
2015-04-203761-003-0800ND
2015-05-183761-003-0815ND
2015-06-153761-003-0800ND
2015-07-223761-003-0905ND
2015-08-173761-003-0840ND
2015-09-213761-003-0845ND
2015-10-193761-003-1045ND
2015-11-173761-003-0915ND
2015-12-213761-003-0750ND
2016-01-193761-003-0800ND
2016-02-163761-003-0920ND
2016-03-213761-003-0755ND
2016-04-183761-003-0900ND
2016-06-203761-003-1120ND
2016-07-183761-003-0855ND
2016-08-153761-003-0800ND
2016-09-193761-003-1000ND
2016-10-173761-003-0800ND
2016-11-213761-003-0830ND
2016-12-193761-003-1145ND
2017-01-173761-003-0750ND
2017-02-213761-003-0800ND
2017-03-203761-003-1015ND
2017-05-153761-003-0740ND
2017-06-193761-003-0830ND
2017-07-173761-003-1000ND
2017-08-213761-003-0730ND
2017-09-183761-003-0940ND
2017-10-163761-003-0930ND
2017-11-203761-003-0840ND
2017-12-183761-003-0930ND