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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Covina Irrigating 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

 

159

Samples

0

Samples exceeding legal limit (MCL)

7

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND540ND
2015ND380ND
20162.00 ppb21ND - 4.00 ppb
2017N/A00N/A
20181.49 ppb114ND - 4.20 ppb
20190.154 ppb542ND - 4.30 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
2014-01-069588-001-0940ND
2014-01-069588-002-0955ND
2014-01-069588-003-1010ND
2014-01-069588-008-0940ND
2014-01-279588-002-0850ND
2014-01-279588-003-0900ND
2014-02-039588-001-1000ND
2014-02-039588-002-1010ND
2014-02-039588-003-1020ND
2014-02-039588-008-1000ND
2014-03-039588-001-1010ND
2014-03-039588-002-1020ND
2014-03-039588-003-1028ND
2014-03-039588-008-1010ND
2014-04-019588-001-0900ND
2014-04-019588-002-0910ND
2014-04-019588-003-0920ND
2014-04-019588-008-0900ND
2014-04-259588-002-1040ND
2014-04-259588-003-1045ND
2014-05-069588-001-0955ND
2014-05-069588-002-1005ND
2014-05-069588-003-1010ND
2014-05-069588-008-0955ND
2014-06-029588-001-1010ND
2014-06-029588-002-1025ND
2014-06-029588-003-1035ND
2014-06-029588-008-1010ND
2014-07-019588-001-1020ND
2014-07-019588-002-1030ND
2014-07-019588-003-1040ND
2014-07-019588-008-1020ND
2014-07-259588-001-1100ND
2014-07-259588-002-1105ND
2014-07-259588-003-1110ND
2014-08-059588-001-1035ND
2014-08-059588-002-1040ND
2014-08-059588-003-1050ND
2014-08-059588-008-1035ND
2014-09-029588-001-0935ND
2014-09-029588-002-0945ND
2014-09-029588-003-0950ND
2014-09-029588-008-0935ND
2014-10-069588-002-1224ND
2014-10-069588-003-1230ND
2014-10-069588-008-1202ND
2014-10-249588-002-1005ND
2014-10-249588-003-1015ND
2014-11-039588-002-1052ND
2014-11-039588-003-1105ND
2014-11-039588-008-1047ND
2014-12-029588-002-1047ND
2014-12-029588-003-1100ND
2014-12-029588-008-1108ND
2015-01-209588-002-1020ND
2015-01-209588-003-1030ND
2015-01-209588-008-1015ND
2015-01-269588-002-1000ND
2015-01-269588-003-1010ND
2015-02-029588-002-1035ND
2015-02-029588-003-1040ND
2015-02-029588-008-1030ND
2015-03-099588-002-1024ND
2015-03-099588-003-1030ND
2015-03-099588-008-1015ND
2015-04-069588-002-1138ND
2015-04-069588-003-1145ND
2015-04-069588-008-1122ND
2015-04-249588-002-1000ND
2015-04-249588-003-1010ND
2015-05-049588-002-0947ND
2015-05-049588-003-0952ND
2015-05-049588-008-0938ND
2015-06-019588-002-1103ND
2015-06-019588-003-1109ND
2015-06-019588-008-1056ND
2015-07-079588-002-1055ND
2015-07-079588-003-1105ND
2015-07-079588-008-1045ND
2015-07-249588-002-1015ND
2015-07-249588-003-1025ND
2015-08-039588-002-0955ND
2015-08-039588-003-1000ND
2015-08-039588-008-0945ND
2015-09-019588-002-1040ND
2015-09-019588-003-1050ND
2015-09-019588-008-1035ND
2015-11-029588-002-1033ND
2015-11-029588-008-1020ND
2015-11-109588-002-0900ND
2015-12-019588-002-1041ND
2015-12-019588-008-1034ND
2016-01-049588-002-1015ND
2016-01-049588-008-10104.00 ppb
2018-08-089588-002-1410ND
2018-08-109588-001-1330ND
2018-08-109588-003-1345ND
2018-09-129588-001-1500ND
2018-09-129588-002-1510ND
2018-09-129588-003-1520ND
2018-11-309588-001-1200ND
2018-11-309588-002-12054.00 ppb
2018-11-309588-002-12104.10 ppb
2018-11-309588-003-12104.20 ppb
2018-11-309588-003-12154.10 ppb
2019-01-239588-001-1114ND
2019-01-239588-001-1115ND
2019-01-239588-002-1118ND
2019-01-239588-002-1120ND
2019-01-239588-003-1125ND
2019-01-239588-003-1126ND
2019-02-129588-001-1630ND
2019-02-129588-002-1620ND
2019-02-149588-003-1115ND
2019-02-149588-008-1315ND
2019-03-049588-001-0709ND
2019-03-049588-002-07144.30 ppb
2019-03-049588-003-1045ND
2019-03-049588-008-0719ND
2019-04-109588-001-1040ND
2019-04-109588-002-1052ND
2019-04-109588-003-1100ND
2019-04-109588-008-1115ND
2019-04-259588-001-1035ND
2019-04-259588-002-1040ND
2019-04-259588-003-1045ND
2019-05-069588-001-1040ND
2019-05-069588-002-1030ND
2019-05-069588-003-1025ND
2019-06-039588-001-0940ND
2019-06-039588-002-0950ND
2019-06-039588-003-0945ND
2019-06-039588-008-1000ND
2019-07-019588-001-1005ND
2019-07-019588-002-1015ND
2019-07-019588-003-1030ND
2019-07-019588-008-1045ND
2019-07-259588-001-1050ND
2019-07-259588-002-11054.00 ppb
2019-07-259588-003-1100ND
2019-08-059588-001-1440ND
2019-08-059588-002-1457ND
2019-08-059588-003-1445ND
2019-08-059588-008-1455ND
2019-09-039588-001-0724ND
2019-09-039588-002-0712ND
2019-09-039588-003-0716ND
2019-09-039588-008-0719ND
2019-10-039588-001-1445ND
2019-10-039588-003-1430ND
2019-10-039588-008-1440ND
2019-10-049588-002-1300ND
2019-10-249588-001-0925ND
2019-10-249588-002-0930ND
2019-10-249588-003-0935ND
2019-11-049588-001-1040ND
2019-11-049588-002-1035ND
2019-11-049588-003-1015ND
2019-11-049588-008-1020ND