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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Hesperia 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.

MORE ABOUT THIS CONTAMINANT

 

62

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015ND160ND
2016N/A00N/A
2017ND160ND
2018ND170ND
2019ND130ND

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
2015-07-093761-002-0845ND
2015-07-093761-018-0924ND
2015-07-093761-010-0945ND
2015-07-093761-021-0900ND
2015-07-133761-014-1030ND
2015-07-133761-015-1000ND
2015-07-133761-013-0945ND
2015-07-153761-038-0815ND
2015-07-153761-039-0725ND
2015-07-153761-005-0715ND
2015-07-153761-013-0745ND
2015-07-163761-033-0800ND
2015-07-163761-009-0825ND
2015-07-203761-019-0800ND
2015-07-213761-022-0820ND
2015-12-143761-036-1400ND
2017-07-103761-019-0800ND
2017-07-103761-014-0830ND
2017-07-103761-002-1030ND
2017-07-103761-018-1000ND
2017-07-103761-036-0900ND
2017-07-103761-013-0930ND
2017-07-103761-010-1100ND
2017-07-123761-021-0730ND
2017-07-133761-038-0900ND
2017-07-143761-033-0800ND
2017-07-143761-039-0830ND
2017-07-183761-013-0730ND
2017-07-183761-009-0830ND
2017-07-203761-005-0945ND
2017-07-313761-022-0800ND
2017-08-213761-015-0935ND
2018-07-023761-014-0630ND
2018-07-023761-038-0720ND
2018-07-023761-039-0650ND
2018-07-033761-012-0700ND
2018-07-033761-013-0700ND
2018-07-033761-013-0630ND
2018-07-033761-018-0600ND
2018-07-113761-021-0600ND
2018-07-113761-036-0635ND
2018-07-173761-015-0700ND
2018-07-233761-010-0630ND
2018-07-243761-009-0630ND
2018-07-243761-005-0600ND
2018-07-253761-002-0845ND
2018-07-253761-033-0740ND
2018-07-273761-022-0730ND
2018-07-313761-019-0810ND
2019-06-053761-038-1100ND
2019-06-053761-002-0830ND
2019-06-053761-039-1030ND
2019-06-053761-005-0930ND
2019-06-053761-018-1330ND
2019-06-053761-012-1200ND
2019-06-053761-014-1000ND
2019-06-053761-013-1130ND
2019-06-063761-010-1325ND
2019-06-103761-033-1400ND
2019-06-113761-036-0720ND
2019-06-203761-022-0915ND
2019-07-233761-021-0645ND