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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Elsinore Valley Municipal 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

 

63

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
2014ND10ND
2015ND50ND
2016ND170ND
2017ND20ND
2018ND70ND
20190.213 ppb311ND - 6.60 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
2014-12-174790-040-1115ND
2015-05-074790-038-1350ND
2015-05-184790-033-1300ND
2015-05-184790-032-1410ND
2015-08-244790-040-1050ND
2015-12-104790-040-1300ND
2016-02-034790-050-1130ND
2016-02-034790-049-1315ND
2016-05-184790-032-0935ND
2016-05-184790-033-1425ND
2016-05-264790-052-1030ND
2016-08-114790-010-1110ND
2016-08-114790-037-1220ND
2016-08-174790-040-1230ND
2016-08-174790-012-1240ND
2016-08-174790-022-1320ND
2016-08-174790-031-1150ND
2016-08-254790-004-1505ND
2016-08-254790-053-0910ND
2016-08-254790-007-1040ND
2016-11-034790-032-1412ND
2016-11-034790-033-1330ND
2016-11-174790-038-1500ND
2017-04-289590-002-1310ND
2017-09-289590-038-1430ND
2018-05-014790-038-1420ND
2018-06-074790-002-1128ND
2018-07-114790-022-1502ND
2018-07-184790-021-1055ND
2018-07-264790-050-1348ND
2018-07-264790-049-1328ND
2018-10-034790-021-1417ND
2019-01-094790-012-1350ND
2019-01-244790-053-0900ND
2019-01-254790-053-0818ND
2019-02-144790-031-1250ND
2019-02-144790-004-1320ND
2019-03-264790-038-1428ND
2019-03-264790-038-1004ND
2019-03-274790-038-1008ND
2019-06-074790-052-10456.60 ppb
2019-06-114790-053-1110ND
2019-06-134790-012-0938ND
2019-06-144790-043-0912ND
2019-06-144790-033-0818ND
2019-06-184790-037-1128ND
2019-06-204790-053-1356ND
2019-06-204790-052-1506ND
2019-06-204790-031-1112ND
2019-06-254790-022-1148ND
2019-06-254790-050-1230ND
2019-06-254790-049-1200ND
2019-06-254790-021-1245ND
2019-06-264790-052-1025ND
2019-07-304790-052-1210ND
2019-08-194790-002-1345ND
2019-09-054790-007-1110ND
2019-09-124790-038-1250ND
2019-09-184790-052-1214ND
2019-11-124790-004-1255ND
2019-12-174790-052-1048ND
2019-12-174790-010-1306ND
2019-12-184790-010-1306ND