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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Golden State Water Company - Barstow

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

 

398

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND880ND
2015ND630ND
2016ND620ND
2017ND620ND
2018ND600ND
2019ND630ND

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
2014-01-062706-001-0911ND
2014-01-062706-002-0908ND
2014-01-062706-003-0902ND
2014-01-062706-005-0830ND
2014-01-062706-008-1024ND
2014-01-062706-009-1028ND
2014-01-062706-011-1030ND
2014-01-062706-012-1034ND
2014-01-062706-014-1055ND
2014-01-062706-017-1011ND
2014-01-062706-019-1041ND
2014-01-062706-020-0944ND
2014-01-062706-021-0952ND
2014-01-062706-033-1050ND
2014-01-062706-034-1015ND
2014-01-142706-005-0920ND
2014-01-212706-005-0850ND
2014-01-282706-005-0740ND
2014-02-042706-005-0755ND
2014-02-112706-005-1130ND
2014-02-112706-014-0700ND
2014-02-112706-017-0732ND
2014-02-112706-019-0801ND
2014-02-112706-033-0716ND
2014-02-112706-034-0749ND
2014-02-122706-008-0804ND
2014-02-122706-009-0747ND
2014-02-122706-011-0730ND
2014-02-122706-012-0717ND
2014-02-122706-013-0843ND
2014-02-182706-001-0841ND
2014-02-182706-002-0817ND
2014-02-182706-003-0750ND
2014-02-182706-005-0849ND
2014-02-182706-020-0936ND
2014-02-182706-021-0911ND
2014-02-252706-005-0840ND
2014-05-062706-008-0725ND
2014-05-062706-009-0730ND
2014-05-062706-011-0715ND
2014-05-062706-012-0711ND
2014-05-062706-013-0750ND
2014-05-132706-014-0729ND
2014-05-132706-017-0755ND
2014-05-132706-018-0736ND
2014-05-132706-019-0752ND
2014-05-132706-033-0720ND
2014-05-132706-034-0705ND
2014-05-202706-001-0815ND
2014-05-202706-002-0807ND
2014-05-202706-003-0800ND
2014-05-202706-005-1054ND
2014-05-202706-020-0900ND
2014-05-202706-021-0845ND
2014-08-122706-008-0854ND
2014-08-122706-009-0857ND
2014-08-122706-011-0919ND
2014-08-122706-012-0915ND
2014-08-122706-013-0938ND
2014-08-122706-014-0926ND
2014-08-122706-017-0835ND
2014-08-122706-018-0941ND
2014-08-122706-019-0906ND
2014-08-122706-033-0850ND
2014-08-122706-034-0841ND
2014-08-192706-001-1110ND
2014-08-192706-002-1115ND
2014-08-192706-003-1124ND
2014-08-192706-005-1108ND
2014-08-192706-020-0945ND
2014-08-192706-021-0938ND
2014-11-122706-008-1111ND
2014-11-122706-009-1115ND
2014-11-122706-011-1059ND
2014-11-122706-012-1048ND
2014-11-122706-013-1123ND
2014-11-122706-014-1028ND
2014-11-122706-017-1052ND
2014-11-122706-018-1242ND
2014-11-122706-019-1040ND
2014-11-122706-033-1033ND
2014-11-122706-034-1106ND
2014-11-182706-005-1011ND
2014-11-252706-001-1124ND
2014-11-252706-002-1130ND
2014-11-252706-003-1140ND
2014-11-252706-020-0928ND
2014-11-252706-021-0944ND
2015-02-102706-008-1155ND
2015-02-102706-009-1145ND
2015-02-102706-011-1140ND
2015-02-102706-012-1132ND
2015-02-102706-013-0956ND
2015-02-102706-014-0949ND
2015-02-102706-017-0917ND
2015-02-102706-018-1238ND
2015-02-102706-019-0935ND
2015-02-102706-033-0930ND
2015-02-102706-034-0922ND
2015-02-172706-005-0821ND
2015-02-242706-001-1106ND
2015-02-242706-002-1119ND
2015-02-242706-003-1132ND
2015-02-242706-020-1030ND
2015-02-242706-021-1047ND
2015-05-052706-008-0846ND
2015-05-052706-009-0850ND
2015-05-052706-011-0840ND
2015-05-052706-012-0830ND
2015-05-052706-013-0859ND
2015-05-122706-005-0941ND
2015-05-122706-014-0850ND
2015-05-122706-017-0829ND
2015-05-122706-018-0905ND
2015-05-122706-019-0845ND
2015-05-122706-033-0822ND
2015-05-122706-034-0834ND
2015-05-192706-001-0911ND
2015-05-192706-002-0905ND
2015-05-192706-003-0900ND
2015-05-192706-020-0917ND
2015-05-192706-021-0930ND
2015-08-042706-008-0829ND
2015-08-042706-009-0835ND
2015-08-042706-011-0810ND
2015-08-042706-012-0816ND
2015-08-042706-013-0822ND
2015-08-112706-014-0738ND
2015-08-112706-017-0730ND
2015-08-112706-018-0840ND
2015-08-112706-019-0745ND
2015-08-112706-033-0755ND
2015-08-112706-034-0820ND
2015-08-242706-005-0903ND
2015-11-032706-008-0810ND
2015-11-032706-009-0815ND
2015-11-032706-011-0804ND
2015-11-032706-012-0740ND
2015-11-032706-013-0750ND
2015-11-032706-014-0731ND
2015-11-032706-017-0719ND
2015-11-032706-018-0850ND
2015-11-032706-019-0745ND
2015-11-032706-033-0708ND
2015-11-032706-034-0725ND
2015-11-102706-005-0925ND
2015-11-242706-001-0954ND
2015-11-242706-002-1010ND
2015-11-242706-003-1022ND
2015-11-242706-020-0912ND
2015-11-242706-021-0925ND
2016-02-022706-008-0740ND
2016-02-022706-009-0814ND
2016-02-022706-011-0825ND
2016-02-022706-012-0836ND
2016-02-022706-013-0853ND
2016-02-092706-014-0845ND
2016-02-092706-017-0819ND
2016-02-092706-018-1116ND
2016-02-092706-033-0831ND
2016-02-092706-034-0825ND
2016-02-162706-005-1109ND
2016-02-232706-002-0923ND
2016-02-232706-003-0936ND
2016-02-232706-020-0846ND
2016-02-232706-021-0903ND
2016-03-292706-001-0849ND
2016-05-032706-008-0900ND
2016-05-032706-009-0906ND
2016-05-032706-011-0848ND
2016-05-032706-012-0842ND
2016-05-032706-013-0933ND
2016-05-102706-014-0852ND
2016-05-102706-017-0825ND
2016-05-102706-018-0924ND
2016-05-102706-033-0836ND
2016-05-102706-034-0831ND
2016-05-172706-005-0900ND
2016-05-242706-001-1021ND
2016-05-242706-002-1032ND
2016-05-242706-003-1027ND
2016-05-242706-020-1003ND
2016-05-242706-021-0946ND
2016-08-022710-008-1108ND
2016-08-022710-009-1114ND
2016-08-022710-011-1052ND
2016-08-022710-012-1049ND
2016-08-022710-013-1043ND
2016-08-092710-014-0746ND
2016-08-092710-017-0840ND
2016-08-092710-018-1141ND
2016-08-092710-033-0751ND
2016-08-092710-034-0847ND
2016-08-182710-005-1045ND
2016-08-232710-001-1011ND
2016-08-232710-002-1017ND
2016-08-232710-003-1024ND
2016-08-232710-021-1041ND
2016-11-082706-008-0945ND
2016-11-082706-009-0945ND
2016-11-082706-011-1000ND
2016-11-082706-012-1015ND
2016-11-082706-013-1100ND
2016-11-082706-014-1045ND
2016-11-082706-017-1030ND
2016-11-082706-018-0900ND
2016-11-082706-033-0915ND
2016-11-082706-034-0930ND
2016-11-152706-001-1036ND
2016-11-152706-001-1040ND
2016-11-152706-003-1048ND
2016-11-152706-005-0830ND
2016-11-152706-021-1100ND
2017-02-069590-008-1214ND
2017-02-069590-009-1208ND
2017-02-069590-012-1155ND
2017-02-069590-013-1226ND
2017-02-109590-011-1236ND
2017-02-109590-014-1248ND
2017-02-109590-017-1252ND
2017-04-279590-008-0931ND
2017-04-279590-009-0936ND
2017-04-279590-011-0943ND
2017-04-279590-012-0949ND
2017-04-279590-013-0959ND
2017-04-279590-014-0954ND
2017-04-279590-017-0925ND
2017-04-279590-033-0951ND
2017-05-159590-008-1100ND
2017-05-159590-009-1056ND
2017-05-159590-011-1048ND
2017-05-159590-012-1037ND
2017-05-159590-013-1121ND
2017-05-159590-014-1024ND
2017-05-159590-017-1106ND
2017-05-159590-033-1028ND
2017-05-229590-001-1154ND
2017-05-229590-002-1205ND
2017-05-229590-003-1210ND
2017-05-229590-005-1045ND
2017-05-229590-021-1225ND
2017-07-249590-008-0854ND
2017-07-249590-011-0837ND
2017-07-249590-012-0827ND
2017-07-249590-013-1017ND
2017-07-249590-014-1005ND
2017-07-249590-017-0820ND
2017-07-249590-033-0813ND
2017-08-219590-008-1104ND
2017-08-219590-012-1052ND
2017-08-219590-013-1155ND
2017-08-219590-014-1146ND
2017-08-219590-017-1034ND
2017-08-219590-033-1043ND
2017-08-289590-001-1243ND
2017-08-289590-002-1238ND
2017-08-289590-003-1236ND
2017-08-289590-005-1100ND
2017-08-289590-021-1138ND
2017-09-279590-034-1109ND
2017-10-309590-034-1048ND
2017-11-069590-005-1131ND
2017-11-069590-008-1107ND
2017-11-069590-012-1058ND
2017-11-069590-013-1041ND
2017-11-069590-014-1048ND
2017-11-069590-017-1114ND
2017-11-069590-033-1052ND
2017-11-139590-018-1119ND
2017-11-219590-019-1141ND
2017-11-279590-001-1119ND
2017-11-279590-002-1126ND
2017-11-279590-003-1134ND
2017-11-279590-021-0854ND
2017-12-059590-020-1231ND
2018-01-029590-008-1132ND
2018-01-029590-012-1119ND
2018-01-029590-013-1037ND
2018-01-029590-014-1020ND
2018-01-029590-017-1139ND
2018-01-029590-033-1025ND
2018-01-229590-001-1318ND
2018-01-229590-002-1324ND
2018-01-229590-003-1329ND
2018-01-229590-005-1202ND
2018-01-229590-018-1338ND
2018-01-229590-020-1307ND
2018-01-229590-021-1302ND
2018-02-209590-019-1208ND
2018-02-209590-034-1140ND
2018-05-089590-008-1132ND
2018-05-089590-012-1155ND
2018-05-089590-013-1255ND
2018-05-089590-014-1050ND
2018-05-089590-017-1220ND
2018-05-089590-019-1000ND
2018-05-089590-033-1105ND
2018-05-089590-034-1320ND
2018-05-299590-001-0909ND
2018-05-299590-002-0916ND
2018-05-299590-003-0924ND
2018-05-299590-005-1135ND
2018-05-299590-020-0849ND
2018-05-299590-021-0828ND
2018-08-209590-005-1058ND
2018-08-209590-008-0956ND
2018-08-209590-012-1007ND
2018-08-209590-013-0943ND
2018-08-209590-014-0930ND
2018-08-209590-017-1018ND
2018-08-209590-019-0902ND
2018-08-209590-033-0916ND
2018-08-209590-034-1030ND
2018-08-279590-001-1020ND
2018-08-279590-002-1037ND
2018-08-279590-003-1102ND
2018-08-279590-018-1245ND
2018-08-279590-020-0756ND
2018-08-279590-021-0808ND
2018-11-059590-001-1015ND
2018-11-059590-002-1021ND
2018-11-059590-005-1223ND
2018-11-059590-008-1147ND
2018-11-059590-012-1141ND
2018-11-059590-013-0912ND
2018-11-059590-014-0903ND
2018-11-059590-019-0848ND
2018-11-059590-020-0747ND
2018-11-059590-021-0742ND
2018-11-059590-033-0833ND
2018-11-059590-034-1158ND
2018-11-139590-018-1152ND
2018-11-269590-003-1153ND
2018-11-269590-011-1309ND
2018-12-269590-019-1201ND
2019-02-049590-008-1219ND
2019-02-049590-011-1229ND
2019-02-049590-012-1234ND
2019-02-049590-013-1116ND
2019-02-049590-014-1137ND
2019-02-049590-018-1200ND
2019-02-049590-019-1241ND
2019-02-049590-033-1147ND
2019-02-049590-034-1214ND
2019-02-259590-001-0846ND
2019-02-259590-002-0855ND
2019-02-259590-003-1246ND
2019-02-259590-005-1020ND
2019-02-259590-020-0806ND
2019-02-259590-021-0827ND
2019-05-069590-011-1043ND
2019-05-069590-012-1056ND
2019-05-069590-013-1158ND
2019-05-069590-014-1129ND
2019-05-069590-018-1122ND
2019-05-069590-019-1115ND
2019-05-069590-033-1026ND
2019-05-069590-034-1107ND
2019-05-139590-001-1253ND
2019-05-139590-002-1301ND
2019-05-139590-003-1307ND
2019-05-139590-005-0935ND
2019-05-139590-020-0752ND
2019-05-139590-021-0757ND
2019-08-059590-008-1136ND
2019-08-059590-009-1144ND
2019-08-059590-011-1120ND
2019-08-059590-012-1113ND
2019-08-059590-013-0931ND
2019-08-059590-014-0723ND
2019-08-059590-017-1231ND
2019-08-059590-018-0714ND
2019-08-059590-019-0708ND
2019-08-059590-033-0719ND
2019-08-059590-034-1212ND
2019-08-269590-001-1246ND
2019-08-269590-002-1306ND
2019-08-269590-003-1315ND
2019-08-269590-005-1337ND
2019-08-269590-020-0752ND
2019-08-269590-021-0744ND
2019-11-189590-001-1336ND
2019-11-189590-002-1329ND
2019-11-189590-003-1325ND
2019-11-189590-005-1406ND
2019-11-189590-008-0959ND
2019-11-189590-009-0940ND
2019-11-189590-011-0921ND
2019-11-189590-012-0906ND
2019-11-189590-013-1257ND
2019-11-189590-014-1251ND
2019-11-189590-017-1202ND
2019-11-189590-018-1231ND
2019-11-189590-019-1240ND
2019-11-189590-020-0719ND
2019-11-189590-021-0712ND
2019-11-189590-033-1259ND
2019-11-189590-034-1153ND