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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Yuima Municipal Water District Ida

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

 

423

Samples

0

Samples exceeding legal limit (MCL)

102

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.42 ppb7317ND - 7.90 ppb
20151.18 ppb6515ND - 6.00 ppb
20161.38 ppb7018ND - 7.10 ppb
20170.699 ppb7410ND - 7.00 ppb
20181.16 ppb7717ND - 6.20 ppb
20192.04 ppb6425ND - 6.40 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
2014-01-142706-002-1000ND
2014-01-142706-004-1045ND
2014-01-142706-005-08556.40 ppb
2014-01-142706-006-0840ND
2014-01-142706-010-0740ND
2014-01-142706-011-0805ND
2014-01-142706-012-08205.20 ppb
2014-01-142706-017-0950ND
2014-01-142706-020-0750ND
2014-01-142706-025-0915ND
2014-01-142706-026-1020ND
2014-01-142706-028-09307.90 ppb
2014-01-142706-029-09406.90 ppb
2014-01-142706-031-09455.70 ppb
2014-01-142706-037-0730ND
2014-01-142706-041-0900ND
2014-01-142706-043-0915ND
2014-02-112706-009-1100ND
2014-02-112706-017-1000ND
2014-02-112706-025-0845ND
2014-02-112706-026-1015ND
2014-03-112706-017-0945ND
2014-03-112706-025-0930ND
2014-03-112706-026-1000ND
2014-04-082706-005-12055.60 ppb
2014-04-082706-006-1220ND
2014-04-082706-012-1250ND
2014-04-082706-017-1100ND
2014-04-082706-025-1125ND
2014-04-082706-026-0955ND
2014-04-082706-028-11557.60 ppb
2014-04-082706-029-11156.70 ppb
2014-04-082706-031-11406.00 ppb
2014-04-082706-032-1106ND
2014-04-082706-033-1102ND
2014-04-082706-044-0900ND
2014-05-132706-017-0915ND
2014-05-132706-025-0820ND
2014-05-132706-026-0945ND
2014-06-102706-017-0930ND
2014-06-102706-025-1000ND
2014-06-102706-026-0915ND
2014-07-082706-005-10155.40 ppb
2014-07-082706-006-1040ND
2014-07-082706-012-1000ND
2014-07-082706-017-1105ND
2014-07-082706-025-1020ND
2014-07-082706-026-1115ND
2014-07-082706-028-10506.90 ppb
2014-07-082706-029-11006.80 ppb
2014-07-082706-031-10305.40 ppb
2014-08-122706-017-0001ND
2014-08-122706-025-0830ND
2014-08-122706-026-0800ND
2014-09-092706-017-0830ND
2014-09-092706-025-0910ND
2014-09-092706-026-0800ND
2014-10-092706-005-13405.00 ppb
2014-10-092706-006-1315ND
2014-10-092706-028-14005.30 ppb
2014-10-092706-029-14156.00 ppb
2014-10-092706-031-12305.00 ppb
2014-10-142706-012-1045ND
2014-10-142706-017-1100ND
2014-10-142706-025-1130ND
2014-10-142706-026-1115ND
2014-10-142706-045-0830ND
2014-11-112706-017-1010ND
2014-11-112706-025-1020ND
2014-11-112706-026-0955ND
2014-12-092706-017-1110ND
2014-12-092706-025-1105ND
2014-12-092706-026-1100ND
2015-01-132706-002-0900ND
2015-01-132706-006-0915ND
2015-01-132706-007-0950ND
2015-01-132706-009-0810ND
2015-01-132706-010-1115ND
2015-01-132706-011-0810ND
2015-01-132706-012-0850ND
2015-01-132706-017-1040ND
2015-01-132706-020-1100ND
2015-01-132706-025-0940ND
2015-01-132706-026-0830ND
2015-01-132706-028-10154.70 ppb
2015-01-132706-029-10255.60 ppb
2015-01-132706-031-07454.90 ppb
2015-01-132706-037-1130ND
2015-02-102706-017-0830ND
2015-02-102706-025-0930ND
2015-02-102706-026-0800ND
2015-03-102706-004-1130ND
2015-03-102706-005-08454.70 ppb
2015-03-102706-017-0805ND
2015-03-102706-025-0820ND
2015-03-102706-026-0745ND
2015-03-102706-046-1020ND
2015-04-142706-005-10154.50 ppb
2015-04-142706-006-0950ND
2015-04-142706-012-0945ND
2015-04-142706-017-0815ND
2015-04-142706-025-1000ND
2015-04-142706-028-10256.00 ppb
2015-04-142706-029-07455.30 ppb
2015-04-142706-031-10104.90 ppb
2015-04-162706-026-1125ND
2015-05-122706-017-1130ND
2015-05-122706-025-1115ND
2015-05-122706-026-0850ND
2015-05-122706-045-1030ND
2015-06-092706-017-1100ND
2015-06-092706-025-1010ND
2015-06-092706-026-0920ND
2015-07-142706-005-1150ND
2015-07-142706-006-1210ND
2015-07-142706-012-1030ND
2015-07-142706-017-1240ND
2015-07-142706-025-1132ND
2015-07-142706-026-1230ND
2015-07-142706-028-12305.50 ppb
2015-07-142706-029-12244.40 ppb
2015-07-142706-031-11244.90 ppb
2015-08-112706-017-1026ND
2015-08-112706-025-1100ND
2015-08-112706-026-0720ND
2015-09-082706-046-1050ND
2015-10-132706-005-11355.20 ppb
2015-10-132706-006-1145ND
2015-10-132706-012-1235ND
2015-10-132706-017-1107ND
2015-10-132706-025-1156ND
2015-10-132706-026-1115ND
2015-10-132706-028-11306.00 ppb
2015-10-132706-029-11235.80 ppb
2015-10-132706-031-11004.30 ppb
2015-11-102706-017-0900ND
2015-11-102706-025-0830ND
2015-11-102706-026-0915ND
2016-01-122706-004-1000ND
2016-01-122706-005-08005.20 ppb
2016-01-122706-006-0745ND
2016-01-122706-012-0815ND
2016-01-122706-017-0730ND
2016-01-122706-020-1100ND
2016-01-122706-025-0830ND
2016-01-122706-026-1015ND
2016-01-122706-028-09305.70 ppb
2016-01-122706-029-09154.90 ppb
2016-01-122706-031-0745ND
2016-01-122706-040-0905ND
2016-02-092706-017-1130ND
2016-02-092706-025-1110ND
2016-02-092706-026-1145ND
2016-02-092706-037-1130ND
2016-03-082706-017-0830ND
2016-03-082706-026-0800ND
2016-03-102706-025-1150ND
2016-03-102706-048-1130ND
2016-04-122706-005-08105.60 ppb
2016-04-122706-006-1040ND
2016-04-122706-012-11004.60 ppb
2016-04-122706-017-0935ND
2016-04-122706-025-1015ND
2016-04-122706-026-1045ND
2016-04-122706-029-10004.80 ppb
2016-04-122706-031-09054.60 ppb
2016-04-122706-042-0745ND
2016-04-122706-047-09204.40 ppb
2016-05-102706-017-1025ND
2016-05-102706-025-0840ND
2016-05-102706-026-1110ND
2016-05-102706-028-09255.40 ppb
2016-06-142706-017-0945ND
2016-06-142706-025-1030ND
2016-06-142706-026-1045ND
2016-07-122706-005-09255.70 ppb
2016-07-122706-006-0910ND
2016-07-122706-012-0830ND
2016-07-122706-017-1015ND
2016-07-122706-025-0800ND
2016-07-122706-026-0900ND
2016-07-122706-029-09455.80 ppb
2016-07-122706-031-0945ND
2016-08-092710-017-1040ND
2016-08-092710-025-0930ND
2016-08-092710-026-1055ND
2016-08-092710-028-10107.10 ppb
2016-08-092710-047-08205.70 ppb
2016-09-132706-017-1045ND
2016-09-132706-025-0945ND
2016-09-132706-026-1115ND
2016-09-132706-048-1130ND
2016-10-112706-005-10555.70 ppb
2016-10-112706-012-10154.10 ppb
2016-10-112706-017-1155ND
2016-10-112706-025-1105ND
2016-10-112706-026-1040ND
2016-10-112706-028-11206.10 ppb
2016-10-112706-029-11406.30 ppb
2016-10-112706-031-1045ND
2016-10-112706-047-12104.70 ppb
2016-10-142706-011-1030ND
2016-11-082706-017-1130ND
2016-11-082706-025-1015ND
2016-11-082706-026-1145ND
2016-12-132706-017-1020ND
2016-12-132706-025-0910ND
2016-12-132706-026-1035ND
2017-01-102706-004-1205ND
2017-01-102706-005-11055.20 ppb
2017-01-102706-006-1140ND
2017-01-102706-011-0920ND
2017-01-102706-012-11304.30 ppb
2017-01-102706-017-1030ND
2017-01-102706-020-0950ND
2017-01-102706-025-1110ND
2017-01-102706-026-1200ND
2017-01-102706-029-10405.30 ppb
2017-01-102706-031-1155ND
2017-01-102706-037-1000ND
2017-01-102706-041-1105ND
2017-01-102706-043-1115ND
2017-01-102706-044-1120ND
2017-01-102706-047-09354.10 ppb
2017-02-142706-017-1045ND
2017-02-142706-025-0930ND
2017-02-142706-026-1100ND
2017-02-142706-028-1015ND
2017-03-142706-017-1050ND
2017-03-142706-025-1120ND
2017-03-142706-026-1015ND
2017-04-112706-005-09404.60 ppb
2017-04-112706-012-1040ND
2017-04-112706-017-0930ND
2017-04-112706-025-0950ND
2017-04-112706-026-1100ND
2017-04-112706-031-1045ND
2017-04-112706-032-0900ND
2017-04-112706-033-0910ND
2017-04-112706-047-0905ND
2017-05-092706-017-1010ND
2017-05-092706-025-0950ND
2017-05-092706-026-1030ND
2017-05-092706-037-1050ND
2017-06-132706-017-1100ND
2017-06-132706-025-0945ND
2017-06-132706-026-1115ND
2017-06-132706-029-10455.40 ppb
2017-06-132706-046-0900ND
2017-07-112706-005-11006.10 ppb
2017-07-112706-017-1130ND
2017-07-112706-020-0745ND
2017-07-112706-025-1115ND
2017-07-112706-026-1155ND
2017-07-112706-028-11407.00 ppb
2017-07-112706-029-11505.50 ppb
2017-07-112706-031-1125ND
2017-07-112706-047-09154.20 ppb
2017-08-082706-012-0915ND
2017-08-082706-017-1100ND
2017-08-082706-025-1015ND
2017-08-082706-026-0800ND
2017-09-122706-017-0945ND
2017-09-122706-025-0845ND
2017-09-122706-026-1000ND
2017-10-102706-005-1045ND
2017-10-102706-006-1100ND
2017-10-102706-012-1105ND
2017-10-102706-017-0945ND
2017-10-102706-020-0845ND
2017-10-102706-025-1030ND
2017-10-102706-026-0930ND
2017-10-102706-028-1015ND
2017-10-102706-029-1000ND
2017-10-102706-031-1115ND
2017-10-102706-047-1200ND
2017-11-142706-017-1005ND
2017-11-142706-025-1030ND
2017-11-142706-026-0940ND
2017-12-122706-017-0900ND
2017-12-122706-025-0840ND
2017-12-122706-026-0815ND
2018-01-082706-007-1340ND
2018-01-082706-045-1140ND
2018-01-092706-004-1040ND
2018-01-092706-005-08305.20 ppb
2018-01-092706-006-0840ND
2018-01-092706-012-09204.10 ppb
2018-01-092706-017-0820ND
2018-01-092706-020-0930ND
2018-01-092706-025-0855ND
2018-01-092706-026-1110ND
2018-01-092706-028-07555.80 ppb
2018-01-092706-029-08005.40 ppb
2018-01-092706-031-10454.20 ppb
2018-01-092706-047-07454.50 ppb
2018-01-092706-048-1045ND
2018-01-232706-011-0900ND
2018-02-132706-017-1000ND
2018-02-132706-025-0920ND
2018-02-132706-026-1030ND
2018-02-132706-037-1045ND
2018-03-132706-017-0945ND
2018-03-132706-025-0910ND
2018-03-132706-026-1045ND
2018-04-102706-005-1000ND
2018-04-102706-006-0930ND
2018-04-102706-012-0800ND
2018-04-102706-017-0900ND
2018-04-102706-020-1030ND
2018-04-102706-025-0945ND
2018-04-102706-026-0910ND
2018-04-102706-028-08304.50 ppb
2018-04-102706-029-0845ND
2018-04-102706-031-0940ND
2018-04-102706-047-1100ND
2018-05-082706-017-0800ND
2018-05-082706-025-0850ND
2018-05-082706-026-1145ND
2018-06-122706-017-0900ND
2018-06-122706-025-1015ND
2018-06-122706-026-0840ND
2018-07-102706-004-1105ND
2018-07-102706-005-08306.20 ppb
2018-07-102706-006-0850ND
2018-07-102706-012-0800ND
2018-07-102706-017-1015ND
2018-07-102706-020-1050ND
2018-07-102706-025-0910ND
2018-07-102706-026-1000ND
2018-07-102706-028-09306.20 ppb
2018-07-102706-029-09505.10 ppb
2018-07-102706-031-09505.40 ppb
2018-07-102706-040-0930ND
2018-07-102706-042-0920ND
2018-07-102706-047-11155.70 ppb
2018-08-142706-017-0820ND
2018-08-142706-025-0910ND
2018-08-142706-026-0745ND
2018-09-112706-017-0910ND
2018-09-112706-025-0845ND
2018-09-112706-026-0800ND
2018-10-092706-005-09455.80 ppb
2018-10-092706-006-0950ND
2018-10-092706-012-1105ND
2018-10-092706-017-0915ND
2018-10-092706-020-0830ND
2018-10-092706-025-0940ND
2018-10-092706-026-1140ND
2018-10-092706-028-10405.90 ppb
2018-10-092706-029-09256.00 ppb
2018-10-092706-047-11405.50 ppb
2018-10-302706-031-09154.10 ppb
2018-11-132706-017-0930ND
2018-11-132706-025-0850ND
2018-11-132706-026-1000ND
2018-12-112706-017-0800ND
2018-12-112706-025-0815ND
2018-12-112706-026-0945ND
2019-01-082706-004-1015ND
2019-01-082706-005-08455.80 ppb
2019-01-082706-006-0830ND
2019-01-082706-011-0800ND
2019-01-082706-012-08154.60 ppb
2019-01-082706-017-0945ND
2019-01-082706-025-0900ND
2019-01-082706-026-1000ND
2019-01-082706-028-09005.60 ppb
2019-01-082706-029-09305.70 ppb
2019-01-082706-031-09454.40 ppb
2019-01-082706-037-1015ND
2019-01-082706-047-10305.50 ppb
2019-01-082706-048-1010ND
2019-02-122706-017-1000ND
2019-02-122706-025-0830ND
2019-02-122706-026-1030ND
2019-03-122706-025-1015ND
2019-03-122706-048-1045ND
2019-04-092706-005-11156.30 ppb
2019-04-092706-006-1120ND
2019-04-092706-012-11254.60 ppb
2019-04-092706-017-0950ND
2019-04-092706-020-1005ND
2019-04-092706-025-1105ND
2019-04-092706-026-0930ND
2019-04-092706-028-11455.40 ppb
2019-04-092706-029-11505.50 ppb
2019-04-092706-031-11005.90 ppb
2019-04-092706-032-0900ND
2019-04-092706-047-10154.20 ppb
2019-04-302706-020-0800ND
2019-06-112706-005-12005.30 ppb
2019-06-112706-025-1120ND
2019-06-112706-028-12005.00 ppb
2019-06-112706-029-12154.20 ppb
2019-06-112706-033-0845ND
2019-06-112706-041-0800ND
2019-07-092706-005-08155.70 ppb
2019-07-092706-006-0800ND
2019-07-092706-012-0845ND
2019-07-092706-017-1030ND
2019-07-092706-020-1130ND
2019-07-092706-025-0745ND
2019-07-092706-026-1100ND
2019-07-092706-028-09455.50 ppb
2019-07-092706-029-09504.50 ppb
2019-07-092706-031-07304.20 ppb
2019-07-092706-047-11305.10 ppb
2019-08-132706-025-0850ND
2019-09-102706-025-1000ND
2019-10-082706-005-09406.40 ppb
2019-10-082706-006-0930ND
2019-10-082706-012-09004.20 ppb
2019-10-082706-017-0720ND
2019-10-082706-020-1045ND
2019-10-082706-025-1000ND
2019-10-082706-026-0755ND
2019-10-082706-028-10156.00 ppb
2019-10-082706-029-07105.90 ppb
2019-10-082706-031-0950ND
2019-10-082706-047-11004.80 ppb
2019-11-122706-025-1015ND
2019-12-032706-025-0945ND