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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

California American Water Company - Suburban

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

 

310

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND510ND
2015ND570ND
2016ND430ND
2017ND480ND
2018ND590ND
2019ND520ND

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
2014-02-101225-004-0940ND
2014-02-101225-013-1330ND
2014-02-101225-016-1300ND
2014-02-111225-006-1055ND
2014-02-111225-009-0950ND
2014-02-111225-010-1215ND
2014-02-111225-021-1040ND
2014-02-191225-008-1140ND
2014-03-031225-017-1125ND
2014-03-041225-011-1300ND
2014-03-251225-019-1010ND
2014-03-261225-007-1220ND
2014-05-061225-004-1330ND
2014-05-061225-007-1105ND
2014-05-061225-009-1300ND
2014-05-061225-011-1238ND
2014-05-061225-013-1210ND
2014-05-061225-016-1115ND
2014-05-061225-017-0930ND
2014-05-061225-019-1030ND
2014-05-071225-006-1020ND
2014-05-071225-008-0935ND
2014-05-071225-010-0945ND
2014-05-071225-021-1128ND
2014-06-171225-018-1150ND
2014-07-221225-014-1030ND
2014-08-111225-005-1005ND
2014-08-111225-006-1110ND
2014-08-111225-008-1025ND
2014-08-111225-010-1230ND
2014-08-111225-011-0940ND
2014-08-111225-015-0835ND
2014-08-111225-016-1110ND
2014-08-111225-017-1225ND
2014-08-111225-019-1145ND
2014-08-111225-020-0800ND
2014-08-111225-021-1150ND
2014-08-121225-004-1230ND
2014-08-121225-007-1100ND
2014-08-121225-013-0935ND
2014-10-061225-006-1205ND
2014-10-061225-011-1145ND
2014-10-061225-013-0920ND
2014-10-061225-016-1030ND
2014-10-061225-017-0850ND
2014-10-061225-019-1000ND
2014-10-061225-021-1005ND
2014-10-081225-004-1020ND
2014-10-081225-008-0910ND
2014-10-081225-010-1020ND
2014-12-031225-007-1115ND
2015-02-101225-004-1130ND
2015-02-101225-006-0840ND
2015-02-101225-010-0854ND
2015-02-101225-013-0948ND
2015-02-101225-017-1048ND
2015-02-101225-019-1030ND
2015-02-101225-021-0918ND
2015-02-111225-007-0935ND
2015-02-111225-008-1030ND
2015-02-121225-011-1040ND
2015-02-251225-016-1152ND
2015-04-061225-006-1055ND
2015-04-061225-013-0915ND
2015-04-061225-016-1000ND
2015-04-061225-017-1030ND
2015-04-061225-019-0910ND
2015-04-071225-004-1015ND
2015-04-071225-007-1115ND
2015-04-071225-008-1135ND
2015-04-071225-010-1020ND
2015-04-091225-011-0900ND
2015-04-231225-021-1245ND
2015-07-081225-004-0850ND
2015-07-081225-006-0950ND
2015-07-081225-008-0910ND
2015-07-081225-010-1110ND
2015-07-081225-013-1100ND
2015-07-081225-016-1030ND
2015-07-081225-019-0940ND
2015-07-081225-021-1030ND
2015-07-091225-017-1045ND
2015-07-091225-020-1030ND
2015-07-141225-011-1030ND
2015-07-151225-007-0920ND
2015-07-151225-052-1025ND
2015-07-201225-014-0920ND
2015-07-201225-049-1210ND
2015-07-221225-044-0845ND
2015-07-221225-051-1110ND
2015-07-271225-018-1005ND
2015-07-271225-053-1220ND
2015-07-281225-048-0900ND
2015-08-131225-015-1005ND
2015-08-261225-005-0930ND
2015-08-271225-047-0750ND
2015-10-081225-004-0900ND
2015-10-081225-006-1010ND
2015-10-081225-013-1105ND
2015-10-081225-016-1020ND
2015-10-081225-019-0945ND
2015-10-191225-007-1318ND
2015-10-201225-017-1040ND
2015-10-201225-021-1135ND
2015-10-261225-008-1143ND
2015-10-261225-011-1355ND
2015-10-261225-018-1030ND
2015-12-081225-062-1130ND
2016-01-181225-004-1230ND
2016-01-181225-007-1155ND
2016-01-181225-017-1100ND
2016-01-201225-006-1005ND
2016-01-201225-008-1340ND
2016-01-201225-011-1402ND
2016-01-201225-019-1125ND
2016-01-251225-010-1400ND
2016-01-251225-021-1110ND
2016-04-061225-006-1045ND
2016-04-061225-016-1410ND
2016-04-061225-017-1300ND
2016-04-061225-021-1445ND
2016-04-121225-004-1340ND
2016-04-121225-007-1155ND
2016-04-121225-011-1110ND
2016-04-121225-019-1235ND
2016-04-141225-008-1225ND
2016-04-141225-013-1130ND
2016-06-091225-010-1415ND
2016-07-061225-016-1207ND
2016-07-061225-017-1038ND
2016-07-061225-019-1136ND
2016-07-061225-020-0816ND
2016-07-111225-004-1000ND
2016-07-111225-006-1300ND
2016-07-111225-013-1150ND
2016-07-111225-021-1225ND
2016-07-211225-007-0848ND
2016-07-211225-008-1203ND
2016-07-211225-014-0810ND
2016-07-271225-005-0945ND
2016-07-271225-011-0943ND
2016-10-111225-004-1215ND
2016-10-111225-006-0920ND
2016-10-111225-011-1250ND
2016-10-111225-013-1020ND
2016-10-111225-016-1110ND
2016-10-111225-017-1200ND
2016-10-111225-019-1040ND
2016-10-111225-021-0950ND
2016-10-121225-007-0900ND
2016-10-121225-008-1010ND
2017-02-131225-004-0855ND
2017-02-131225-006-0915ND
2017-02-131225-008-1240ND
2017-02-131225-011-1310ND
2017-02-131225-013-1010ND
2017-02-131225-016-1135ND
2017-02-131225-019-1115ND
2017-02-131225-021-0940ND
2017-02-141225-007-1025ND
2017-02-141225-017-1055ND
2017-02-161225-010-1000ND
2017-03-071225-010-0920ND
2017-05-081225-004-0925ND
2017-05-081225-006-1005ND
2017-05-081225-008-1250ND
2017-05-081225-011-1330ND
2017-05-081225-013-1035ND
2017-05-081225-017-0945ND
2017-05-081225-019-1110ND
2017-05-081225-021-1155ND
2017-05-101225-007-0925ND
2017-05-101225-016-1050ND
2017-08-021225-004-0955ND
2017-08-021225-013-1210ND
2017-08-021225-016-1140ND
2017-08-021225-017-1035ND
2017-08-021225-019-1115ND
2017-08-021225-020-0920ND
2017-08-031225-005-1015ND
2017-08-031225-006-1045ND
2017-08-031225-008-1010ND
2017-08-031225-011-0943ND
2017-08-071225-021-1350ND
2017-08-211225-012-0920ND
2017-10-041225-010-1425ND
2017-10-121225-050-1230ND
2017-11-061225-004-1110ND
2017-11-061225-006-1415ND
2017-11-061225-011-1310ND
2017-11-061225-021-1358ND
2017-11-081225-007-0938ND
2017-11-081225-016-1210ND
2017-11-081225-017-1325ND
2017-11-081225-019-1150ND
2017-11-091225-008-1350ND
2017-11-091225-013-1135ND
2017-11-281225-013-1230ND
2017-12-061225-014-1140ND
2018-02-131225-006-1045ND
2018-02-131225-010-1145ND
2018-02-131225-013-1020ND
2018-02-131225-016-1000ND
2018-02-131225-017-0902ND
2018-02-131225-019-0944ND
2018-02-141225-007-0948ND
2018-02-151225-004-0825ND
2018-02-151225-008-1040ND
2018-02-151225-011-1119ND
2018-02-151225-021-1005ND
2018-05-011225-008-1005ND
2018-05-011225-010-1130ND
2018-05-011225-011-0900ND
2018-05-011225-021-1100ND
2018-05-021225-004-1045ND
2018-05-021225-007-1130ND
2018-05-021225-013-1000ND
2018-05-021225-016-0903ND
2018-05-021225-019-1011ND
2018-05-031225-006-1053ND
2018-05-031225-017-1215ND
2018-08-061233-005-0810ND
2018-08-061233-014-1055ND
2018-08-061233-018-0915ND
2018-08-061233-020-1240ND
2018-08-061233-051-1230ND
2018-08-081233-007-0945ND
2018-08-081233-011-1305ND
2018-08-081233-044-1110ND
2018-08-081233-047-1230ND
2018-08-091233-004-0905ND
2018-08-091233-006-1300ND
2018-08-091233-016-0815ND
2018-08-091233-049-1100ND
2018-08-091233-052-1250ND
2018-08-131233-001-0850ND
2018-08-131233-010-1140ND
2018-08-131233-013-1015ND
2018-08-131233-017-0900ND
2018-08-131233-019-1015ND
2018-08-131233-021-1020ND
2018-08-141233-012-1130ND
2018-08-141233-053-0905ND
2018-08-141233-062-0840ND
2018-09-111233-009-0845ND
2018-10-171233-008-1030ND
2018-10-171233-023-1115ND
2018-11-071225-010-1120ND
2018-11-071225-013-1040ND
2018-11-071225-016-1010ND
2018-11-071225-017-0920ND
2018-11-071225-019-0950ND
2018-11-081225-004-0810ND
2018-11-081225-011-1020ND
2018-11-081225-021-0910ND
2018-11-141225-006-0955ND
2018-11-141225-007-0920ND
2018-11-141225-009-1120ND
2019-02-061225-009-1300ND
2019-02-071225-010-1300ND
2019-02-071225-019-1050ND
2019-02-111225-004-1115ND
2019-02-111225-006-1345ND
2019-02-111225-007-1210ND
2019-02-111225-008-1310ND
2019-02-111225-011-1430ND
2019-02-111225-013-1255ND
2019-02-111225-016-1125ND
2019-02-111225-021-1215ND
2019-05-131225-004-1040ND
2019-05-131225-008-1320ND
2019-05-131225-016-1150ND
2019-05-131225-019-1125ND
2019-05-131225-021-1230ND
2019-05-141225-010-1248ND
2019-05-151225-011-1450ND
2019-05-151225-013-1245ND
2019-05-161225-007-1330ND
2019-05-201225-009-1300ND
2019-06-041225-017-1000ND
2019-06-171225-006-1215ND
2019-08-071225-014-1200ND
2019-08-071225-017-1050ND
2019-08-071225-019-1105ND
2019-08-081225-004-1500ND
2019-08-081225-005-1415ND
2019-08-081225-008-1110ND
2019-08-081225-011-1230ND
2019-08-081225-016-1025ND
2019-08-081225-020-1120ND
2019-08-081225-021-1200ND
2019-08-121225-006-1410ND
2019-08-121225-012-1200ND
2019-08-121225-013-1240ND
2019-08-121225-015-1230ND
2019-08-141225-007-1115ND
2019-08-141225-010-1230ND
2019-09-181225-009-1545ND
2019-11-041225-010-1214ND
2019-11-111225-004-1748ND
2019-11-111225-008-1318ND
2019-11-111225-011-1157ND
2019-11-111225-016-1637ND
2019-11-121225-007-1300ND
2019-11-121225-009-1430ND
2019-11-121225-019-1533ND
2019-11-121225-021-1407ND
2019-11-131225-006-1233ND
2019-11-131225-013-1427ND
2019-11-141225-017-1233ND