Menu

EWG's Tap Water Database — 2021 UPDATE

Donate

Perchlorate

Valencia 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.

MORE ABOUT THIS CONTAMINANT

 

287

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND500ND
2015ND480ND
2016ND480ND
2017ND480ND
2018ND480ND
20190.182 ppb451ND - 8.20 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 Lab ID Result
2014-01-229590-017-1030ND
2014-01-229590-073-0925ND
2014-02-129590-005-0910ND
2014-02-129590-018-0935ND
2014-02-129590-024-1010ND
2014-02-129590-026-0850ND
2014-02-199590-025-0910ND
2014-02-199590-046-0950ND
2014-02-269590-003-0816ND
2014-02-269590-004-1028ND
2014-02-269590-047-1020ND
2014-02-269590-073-0847ND
2014-05-149590-005-0800ND
2014-05-149590-018-0830ND
2014-05-149590-024-0910ND
2014-05-149590-026-0850ND
2014-05-219590-025-0915ND
2014-05-219590-046-0845ND
2014-05-289590-003-1000ND
2014-05-289590-004-0830ND
2014-05-289590-047-0920ND
2014-06-259590-073-0820ND
2014-08-079590-021-0830ND
2014-08-079590-052-0940ND
2014-08-079590-062-0900ND
2014-08-139590-005-0805ND
2014-08-139590-018-0830ND
2014-08-139590-024-1040ND
2014-08-139590-026-1100ND
2014-08-139590-058-0855ND
2014-08-219590-017-0950ND
2014-08-219590-025-1100ND
2014-08-219590-046-0905ND
2014-08-219590-049-1045ND
2014-08-219590-051-1020ND
2014-08-219590-070-0830ND
2014-08-289590-003-0915ND
2014-08-289590-004-1030ND
2014-08-289590-047-1010ND
2014-08-289590-073-0840ND
2014-11-069590-005-0940ND
2014-11-069590-018-0840ND
2014-11-069590-024-1030ND
2014-11-069590-026-1045ND
2014-11-139590-025-1050ND
2014-11-139590-046-1100ND
2014-11-209590-003-1115ND
2014-11-209590-004-0930ND
2014-11-209590-047-1030ND
2014-11-209590-073-0915ND
2015-02-059590-005-1040ND
2015-02-059590-018-1105ND
2015-02-059590-024-1010ND
2015-02-059590-026-1020ND
2015-02-129590-025-0815ND
2015-02-129590-046-1010ND
2015-02-199590-003-0905ND
2015-02-199590-004-1020ND
2015-02-199590-047-0845ND
2015-02-199590-073-0925ND
2015-05-149590-005-0855ND
2015-05-149590-018-0930ND
2015-05-149590-024-0815ND
2015-05-149590-026-0835ND
2015-05-219590-025-0835ND
2015-05-219590-046-0915ND
2015-05-289590-003-0857ND
2015-05-289590-004-0915ND
2015-05-289590-047-0935ND
2015-05-289590-073-0845ND
2015-08-069590-021-0847ND
2015-08-069590-062-0906ND
2015-08-139590-005-1005ND
2015-08-139590-018-1030ND
2015-08-139590-024-0920ND
2015-08-139590-026-0945ND
2015-08-209590-017-0933ND
2015-08-209590-046-0830ND
2015-08-209590-049-0809ND
2015-08-209590-051-1007ND
2015-08-209590-058-0850ND
2015-08-209590-070-0906ND
2015-08-279590-003-0901ND
2015-08-279590-004-0942ND
2015-08-279590-047-0959ND
2015-08-279590-073-0844ND
2015-09-249590-025-0755ND
2015-10-159590-052-0940ND
2015-11-059590-005-0932ND
2015-11-059590-018-0951ND
2015-11-059590-024-0854ND
2015-11-059590-026-0910ND
2015-11-129590-025-0818ND
2015-11-129590-046-0907ND
2015-11-199590-003-0929ND
2015-11-199590-004-1036ND
2015-11-199590-047-1027ND
2015-11-199590-073-0906ND
2016-02-119590-005-0941ND
2016-02-119590-018-1000ND
2016-02-119590-024-0904ND
2016-02-119590-026-0916ND
2016-02-189590-025-0939ND
2016-02-189590-046-0902ND
2016-02-259590-003-0912ND
2016-02-259590-047-1020ND
2016-02-259590-073-0854ND
2016-04-289590-004-0944ND
2016-05-129590-005-1004ND
2016-05-129590-018-1016ND
2016-05-129590-024-0938ND
2016-05-129590-026-0950ND
2016-05-199590-025-0904ND
2016-05-199590-046-0935ND
2016-05-269590-003-0913ND
2016-05-269590-004-0939ND
2016-05-269590-047-0929ND
2016-05-269590-073-0856ND
2016-08-049590-021-0842ND
2016-08-049590-052-0918ND
2016-08-049590-062-0854ND
2016-08-119590-005-0804ND
2016-08-119590-018-0925ND
2016-08-119590-024-0830ND
2016-08-119590-026-0848ND
2016-08-119590-058-0946ND
2016-08-189590-017-1012ND
2016-08-189590-025-0818ND
2016-08-189590-046-0849ND
2016-08-189590-049-0939ND
2016-08-189590-070-0912ND
2016-08-259590-003-1010ND
2016-08-259590-004-0910ND
2016-08-259590-047-0855ND
2016-08-259590-073-0951ND
2016-08-319590-051-0920ND
2016-11-039590-005-1000ND
2016-11-039590-018-1030ND
2016-11-039590-024-0940ND
2016-11-039590-026-0950ND
2016-11-099590-025-0926ND
2016-11-099590-046-1007ND
2016-11-179590-003-0922ND
2016-11-179590-004-0954ND
2016-11-179590-047-0943ND
2016-11-179590-073-0903ND
2017-02-099590-005-0825ND
2017-02-099590-018-0906ND
2017-02-099590-024-0800ND
2017-02-099590-026-0811ND
2017-02-169590-025-0902ND
2017-02-169590-046-0840ND
2017-02-239590-003-0905ND
2017-02-239590-004-0930ND
2017-02-239590-047-0925ND
2017-02-239590-073-0847ND
2017-05-119590-005-0835ND
2017-05-119590-018-0850ND
2017-05-119590-024-0815ND
2017-05-119590-026-0825ND
2017-05-189590-025-0845ND
2017-05-189590-046-0915ND
2017-05-259590-003-0940ND
2017-05-259590-004-0900ND
2017-05-259590-047-0855ND
2017-05-309590-073-1100ND
2017-08-039590-021-0808ND
2017-08-039590-052-0855ND
2017-08-039590-062-0824ND
2017-08-109590-005-1030ND
2017-08-109590-018-1015ND
2017-08-109590-024-0942ND
2017-08-109590-026-0950ND
2017-08-119590-058-0955ND
2017-08-179590-017-0910ND
2017-08-179590-025-0810ND
2017-08-179590-046-0835ND
2017-08-179590-049-0850ND
2017-08-179590-051-0930ND
2017-08-179590-070-0820ND
2017-08-249590-003-0900ND
2017-08-249590-004-0940ND
2017-08-249590-047-0930ND
2017-08-249590-073-0815ND
2017-11-029590-005-1005ND
2017-11-029590-018-0940ND
2017-11-029590-024-1020ND
2017-11-029590-026-1215ND
2017-11-169590-025-1010ND
2017-11-169590-046-1030ND
2017-11-309590-003-1000ND
2017-11-309590-004-0900ND
2017-11-309590-047-0850ND
2017-11-309590-073-0920ND
2018-02-089590-018-0915ND
2018-02-089590-024-0830ND
2018-02-089590-026-0840ND
2018-02-159590-005-0723ND
2018-02-159590-025-1153ND
2018-02-159590-046-1025ND
2018-02-229590-003-0919ND
2018-02-229590-004-1025ND
2018-02-229590-047-1015ND
2018-02-229590-073-0900ND
2018-05-102104-005-1000ND
2018-05-102104-018-0925ND
2018-05-102104-024-0825ND
2018-05-102104-026-0836ND
2018-05-172104-025-0805ND
2018-05-172104-046-0825ND
2018-05-242104-003-0915ND
2018-05-242104-004-0825ND
2018-05-242104-047-0820ND
2018-05-242104-073-0845ND
2018-08-012104-021-0945ND
2018-08-012104-052-1008ND
2018-08-012104-062-0955ND
2018-08-082104-005-0855ND
2018-08-082104-018-0830ND
2018-08-082104-024-0915ND
2018-08-082104-026-0925ND
2018-08-082104-058-0840ND
2018-08-152104-017-1015ND
2018-08-152104-025-0932ND
2018-08-152104-046-0906ND
2018-08-152104-049-0953ND
2018-08-152104-051-1030ND
2018-08-152104-070-0918ND
2018-08-222104-003-0920ND
2018-08-222104-004-0835ND
2018-08-222104-047-0830ND
2018-08-222104-073-0830ND
2018-11-072104-005-0923ND
2018-11-072104-018-0941ND
2018-11-072104-025-0857ND
2018-11-072104-026-0909ND
2018-11-142104-025-0940ND
2018-11-142104-046-0855ND
2018-11-282104-003-1000ND
2018-11-282104-004-1050ND
2018-11-282104-047-1040ND
2018-11-282104-073-0945ND
2019-02-132104-005-0915ND
2019-02-132104-018-0930ND
2019-02-132104-024-0900ND
2019-02-132104-026-0905ND
2019-02-212104-025-0902ND
2019-02-212104-046-0845ND
2019-02-282104-003-1110ND
2019-02-282104-004-1014ND
2019-02-282104-047-1004ND
2019-02-282104-073-1124ND
2019-05-082104-018-1050ND
2019-05-082104-024-1135ND
2019-05-082104-026-1125ND
2019-05-152104-025-0920ND
2019-05-152104-046-0843ND
2019-05-222104-003-0920ND
2019-05-222104-004-1115ND
2019-05-222104-047-1100ND
2019-05-222104-073-0945ND
2019-08-072104-021-0925ND
2019-08-072104-052-0840ND
2019-08-072104-062-0905ND
2019-08-142104-018-0920ND
2019-08-142104-026-0950ND
2019-08-142104-058-0935ND
2019-08-212104-017-1000ND
2019-08-212104-025-0850ND
2019-08-212104-046-0930ND
2019-08-212104-049-0935ND
2019-08-212104-051-1030ND
2019-08-212104-070-0930ND
2019-08-282104-003-0840ND
2019-08-282104-004-0915ND
2019-08-282104-047-0905ND
2019-08-282104-073-0910ND
2019-11-062104-018-0825ND
2019-11-062104-026-0900ND
2019-11-062104-058-1000ND
2019-11-142104-025-0935ND
2019-11-142104-046-0840ND
2019-11-202104-003-0900ND
2019-11-202104-004-0940ND
2019-11-202104-047-0920ND
2019-11-202104-073-0930ND
2019-11-219590-048-11208.20 ppb