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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Irvine Ranch 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.

 

480

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
2014ND500ND
2015ND500ND
20160.0672 ppb641ND - 4.30 ppb
2017ND870ND
2018ND1260ND
2019ND1030ND

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
2014-01-092706-067-1409ND
2014-01-144417-067-1010ND
2014-01-154417-006-1000ND
2014-02-034317-075-1138ND
2014-02-114417-007-1215ND
2014-02-114417-056-1305ND
2014-02-194417-009-1115ND
2014-02-264417-058-1020ND
2014-02-264417-072-0945ND
2014-03-034317-075-1300ND
2014-03-104417-016-0810ND
2014-03-104417-055-0850ND
2014-03-104317-075-1229ND
2014-03-114417-020-0930ND
2014-03-184417-003-0825ND
2014-03-184417-014-0845ND
2014-03-184417-019-0915ND
2014-03-254417-004-0845ND
2014-03-254417-005-0815ND
2014-04-014317-067-1050ND
2014-04-074317-075-1445ND
2014-04-084417-017-1010ND
2014-04-304417-011-0845ND
2014-04-304417-023-1010ND
2014-04-304417-024-1035ND
2014-04-304417-058-1215ND
2014-05-074417-008-0835ND
2014-05-074417-067-1005ND
2014-05-294317-075-0827ND
2014-06-024317-075-1250ND
2014-06-174417-018-0900ND
2014-07-024317-067-1209ND
2014-07-074317-075-1303ND
2014-07-174317-075-1332ND
2014-08-044317-075-1408ND
2014-08-124317-060-1430ND
2014-08-194417-058-1015ND
2014-08-194417-067-1135ND
2014-08-274317-063-0817ND
2014-08-284417-010-1045ND
2014-09-024317-075-1435ND
2014-10-062706-060-1314ND
2014-10-062706-075-1238ND
2014-10-074417-078-1300ND
2014-10-082706-067-1031ND
2014-10-234317-069-1305ND
2014-11-034317-075-1309ND
2014-11-044417-058-1115ND
2014-11-044417-067-1020ND
2014-12-014317-075-1435ND
2015-01-064317-067-1238ND
2015-01-064317-075-1312ND
2015-01-124417-017-0940ND
2015-01-124417-078-1120ND
2015-01-144417-006-0945ND
2015-01-264417-056-1035ND
2015-01-264417-058-1105ND
2015-01-264417-072-1145ND
2015-01-274417-003-1015ND
2015-01-274417-016-0930ND
2015-01-284417-067-1025ND
2015-02-024317-075-1401ND
2015-02-094417-004-0940ND
2015-02-234417-019-0905ND
2015-03-024317-075-1255ND
2015-03-184417-005-0950ND
2015-03-184417-007-1020ND
2015-03-184417-014-0930ND
2015-03-254417-009-1010ND
2015-03-254417-020-0940ND
2015-04-064317-075-1400ND
2015-04-074417-017-1000ND
2015-04-084417-078-1000ND
2015-04-224317-075-1225ND
2015-04-234317-063-0835ND
2015-04-274417-023-1200ND
2015-04-274417-024-1220ND
2015-04-274317-075-1332ND
2015-04-294417-011-0800ND
2015-05-144417-018-0725ND
2015-05-144417-019-1010ND
2015-05-144417-058-1050ND
2015-05-204417-077-0750ND
2015-06-014417-055-1035ND
2015-06-034417-008-0905ND
2015-06-114417-007-0810ND
2015-07-064317-075-1300ND
2015-07-134417-077-1100ND
2015-07-144417-078-0900ND
2015-08-034317-075-1334ND
2015-08-064417-058-0925ND
2015-08-124317-060-1315ND
2015-08-204417-010-0840ND
2015-09-014317-075-0921ND
2015-10-054417-077-0930ND
2015-10-124417-058-1000ND
2015-11-104317-052-1338ND
2015-12-024317-052-1140ND
2015-12-284417-067-0850ND
2015-12-284417-067-0900ND
2016-01-054317-052-0941ND
2016-01-064317-075-1043ND
2016-01-124417-006-0910ND
2016-01-124417-017-0940ND
2016-01-124417-077-1030ND
2016-01-284417-011-0845ND
2016-01-284417-016-0820ND
2016-01-284417-056-1000ND
2016-01-284417-058-1025ND
2016-01-284417-072-0925ND
2016-02-014317-075-1425ND
2016-02-024317-052-1306ND
2016-02-084417-009-0750ND
2016-02-184417-005-0825ND
2016-02-234417-003-0815ND
2016-02-234417-004-0835ND
2016-02-234417-020-0755ND
2016-02-294417-019-0955ND
2016-03-014317-075-1345ND
2016-03-074417-007-1110ND
2016-03-084317-052-0820ND
2016-03-174417-014-1025ND
2016-04-044317-075-1204ND
2016-04-064317-052-0843ND
2016-04-254317-067-1237ND
2016-05-024317-075-1337ND
2016-05-034317-052-0922ND
2016-05-054417-055-0940ND
2016-05-054417-058-1000ND
2016-05-114417-067-0920ND
2016-05-314417-023-0905ND
2016-05-314417-024-0835ND
2016-05-314417-067-1020ND
2016-06-024417-007-0750ND
2016-06-074317-075-1257ND
2016-06-084417-020-0740ND
2016-06-144317-052-1040ND
2016-06-154317-063-0945ND
2016-06-234417-008-0835ND
2016-06-274417-077-0820ND
2016-07-064317-075-0936ND
2016-07-134317-052-1130ND
2016-07-264417-010-0900ND
2016-07-284417-078-1200ND
2016-08-014317-075-1338ND
2016-08-024317-052-1230ND
2016-08-094417-058-1145ND
2016-08-114317-060-1358ND
2016-09-064317-075-0913ND
2016-09-074317-019-0913ND
2016-09-074317-052-0853ND
2016-09-124417-067-09454.30 ppb
2016-09-214317-067-1248ND
2016-10-034317-075-1200ND
2016-10-044317-019-0845ND
2016-10-044317-052-0828ND
2016-10-044417-058-1115ND
2016-10-044417-067-1020ND
2016-10-044317-067-1056ND
2016-11-074317-075-1330ND
2016-11-084317-019-1050ND
2016-11-084317-052-1020ND
2016-12-054317-075-0915ND
2016-12-294317-052-1425ND
2017-01-034317-075-1346ND
2017-01-094417-017-0920ND
2017-01-114317-052-1055ND
2017-01-114317-067-1116ND
2017-01-174417-011-0835ND
2017-01-174417-016-0805ND
2017-01-174417-077-1040ND
2017-01-194417-058-0940ND
2017-01-194417-067-0830ND
2017-01-234417-003-0950ND
2017-01-234417-005-1055ND
2017-01-234417-006-0850ND
2017-01-234417-014-1015ND
2017-01-234417-019-1040ND
2017-01-264417-007-0830ND
2017-02-064317-060-1237ND
2017-02-064317-075-0930ND
2017-02-074317-052-1018ND
2017-02-144417-004-0820ND
2017-02-144417-020-1340ND
2017-02-144417-078-1010ND
2017-02-284317-085-1334ND
2017-03-014417-020-0755ND
2017-03-064317-075-1245ND
2017-03-074317-052-0820ND
2017-03-144417-056-1210ND
2017-03-214317-063-1418ND
2017-03-214317-064-1437ND
2017-03-234417-055-1000ND
2017-03-294317-069-1032ND
2017-03-304417-055-1405ND
2017-03-304417-055-1415ND
2017-04-034417-017-1100ND
2017-04-034317-075-1345ND
2017-04-044317-019-1110ND
2017-04-044317-052-1315ND
2017-04-134417-006-0820ND
2017-04-264317-085-1040ND
2017-05-024417-008-1320ND
2017-05-024417-010-0910ND
2017-05-024317-019-1010ND
2017-05-024417-023-0800ND
2017-05-024417-024-0850ND
2017-05-024317-052-1144ND
2017-05-024317-075-1223ND
2017-05-094417-007-0820ND
2017-05-174417-020-1140ND
2017-05-254417-055-1000ND
2017-06-014317-052-1016ND
2017-06-014417-058-1100ND
2017-06-014317-075-0950ND
2017-06-014417-078-1030ND
2017-06-204417-067-1220ND
2017-06-224317-067-0940ND
2017-07-034317-075-1107ND
2017-07-054317-019-0850ND
2017-07-054317-052-1127ND
2017-07-054317-067-1207ND
2017-07-104317-060-1313ND
2017-07-264417-055-0930ND
2017-07-264417-067-0900ND
2017-08-014417-018-0830ND
2017-08-014317-018-1000ND
2017-08-014317-075-1107ND
2017-08-094317-052-0825ND
2017-08-234317-060-1022ND
2017-09-054317-075-0942ND
2017-09-124317-019-0841ND
2017-09-124317-052-0818ND
2017-09-124417-072-1100ND
2017-10-034317-067-1225ND
2017-10-034317-075-1200ND
2017-10-044317-052-0745ND
2017-10-094317-060-1415ND
2017-10-104317-052-0830ND
2017-10-104417-067-1125ND
2017-10-124417-055-1035ND
2017-10-164417-017-0910ND
2017-10-164417-058-1110ND
2017-10-174317-052-0922ND
2017-10-244317-052-0955ND
2017-11-074317-052-1132ND
2017-11-074317-075-1316ND
2017-11-144317-052-0837ND
2017-12-044417-009-0820ND
2017-12-044317-075-1225ND
2017-12-064317-052-1300ND
2018-01-034317-052-1020ND
2018-01-034317-067-1046ND
2018-01-094317-060-1255ND
2018-01-154317-075-1402ND
2018-02-054317-075-1302ND
2018-02-064417-006-0800ND
2018-02-064417-017-0720ND
2018-02-064317-019-1340ND
2018-02-064317-052-1408ND
2018-02-074417-011-0810ND
2018-02-074417-016-1000ND
2018-02-084417-005-0800ND
2018-02-084417-019-0840ND
2018-02-144317-019-0900ND
2018-02-144317-085-1413ND
2018-02-154417-014-0835ND
2018-02-154417-067-0915ND
2018-02-204417-003-1220ND
2018-02-204417-009-0810ND
2018-02-204417-055-1030ND
2018-02-204417-056-1045ND
2018-02-204417-058-1115ND
2018-02-204417-072-1005ND
2018-02-214317-052-0822ND
2018-03-014417-077-1025ND
2018-03-054317-060-1433ND
2018-03-064317-019-0845ND
2018-03-064317-052-1045ND
2018-03-084317-075-1136ND
2018-03-124317-075-1013ND
2018-03-134317-052-0951ND
2018-03-204317-052-0913ND
2018-03-204317-063-0820ND
2018-03-274317-052-1022ND
2018-04-024317-075-1324ND
2018-04-034317-052-1100ND
2018-04-034317-060-1000ND
2018-04-034317-067-1130ND
2018-04-094417-006-0930ND
2018-04-112706-052-1055ND
2018-04-162706-069-1246ND
2018-04-172706-052-1233ND
2018-04-172706-085-1141ND
2018-04-184417-007-0910ND
2018-04-252706-052-1349ND
2018-04-304417-023-0825ND
2018-04-304417-024-0810ND
2018-04-304417-055-1305ND
2018-04-304417-058-1330ND
2018-04-304417-067-0900ND
2018-04-304417-078-0925ND
2018-05-014317-052-1036ND
2018-05-084317-052-1220ND
2018-05-104317-075-1013ND
2018-05-144317-075-1035ND
2018-05-214317-075-1350ND
2018-05-244417-008-0805ND
2018-05-304317-075-0945ND
2018-06-054317-067-1243ND
2018-06-054317-075-1325ND
2018-06-074317-052-0858ND
2018-06-114417-020-1110ND
2018-06-124317-067-1301ND
2018-06-124317-075-1337ND
2018-06-184317-067-1331ND
2018-06-184317-075-1409ND
2018-06-194417-018-0755ND
2018-06-254317-075-1234ND
2018-06-264317-067-1042ND
2018-07-024317-060-1302ND
2018-07-034317-052-0852ND
2018-07-034317-067-1040ND
2018-07-034317-075-1055ND
2018-07-104317-052-0902ND
2018-07-104317-075-1303ND
2018-07-114317-067-1021ND
2018-07-164317-075-0838ND
2018-07-174317-067-1204ND
2018-07-194417-067-1110ND
2018-07-234317-075-0900ND
2018-07-244317-052-0929ND
2018-07-244317-067-1400ND
2018-07-304317-067-0935ND
2018-07-304317-075-1005ND
2018-08-014317-052-0915ND
2018-08-024417-055-1050ND
2018-08-024417-058-1110ND
2018-08-074317-067-1030ND
2018-08-074317-075-1010ND
2018-08-154317-075-1347ND
2018-08-214317-075-0845ND
2018-08-274317-075-1032ND
2018-09-054317-075-1039ND
2018-09-064317-052-1140ND
2018-09-104317-075-1252ND
2018-09-174317-075-1350ND
2018-09-254317-075-1042ND
2018-09-274317-052-1117ND
2018-10-014317-075-0858ND
2018-10-024317-052-1138ND
2018-10-024317-060-1030ND
2018-10-094417-055-1240ND
2018-10-094417-058-1315ND
2018-10-094317-075-1022ND
2018-10-114417-006-1100ND
2018-10-124317-067-0908ND
2018-10-154417-067-1130ND
2018-10-154317-075-1018ND
2018-10-164317-052-1127ND
2018-10-224317-075-1029ND
2018-10-234317-052-0940ND
2018-10-294317-075-0946ND
2018-10-304317-052-1204ND
2018-11-054317-067-0808ND
2018-11-054317-075-0737ND
2018-11-064317-052-1120ND
2018-11-134317-052-1203ND
2018-11-134317-067-1412ND
2018-11-134317-075-1335ND
2018-11-204317-052-1009ND
2018-11-274317-052-1131ND
2018-12-034317-075-1327ND
2018-12-044317-052-1119ND
2018-12-114317-052-1000ND
2018-12-184317-052-1115ND
2018-12-274317-052-0930ND
2019-01-044317-067-1017ND
2019-01-044317-075-1027ND
2019-01-074417-006-0940ND
2019-01-074317-067-0917ND
2019-01-074317-075-0853ND
2019-01-084317-052-1236ND
2019-01-094417-056-0935ND
2019-01-094417-067-1000ND
2019-01-094417-078-0910ND
2019-01-144317-067-0952ND
2019-01-144317-075-0933ND
2019-01-214317-067-0855ND
2019-01-214317-075-0825ND
2019-01-224417-003-1130ND
2019-01-224417-005-0915ND
2019-01-224417-009-0850ND
2019-01-224417-011-0830ND
2019-01-224417-014-0940ND
2019-01-224417-016-1010ND
2019-01-284317-067-1302ND
2019-01-284317-075-1237ND
2019-02-054317-052-1207ND
2019-02-054317-075-1038ND
2019-02-064417-024-0920ND
2019-02-134317-060-1135ND
2019-02-214417-007-1155ND
2019-02-214417-008-1220ND
2019-02-214417-018-1130ND
2019-02-214417-020-1250ND
2019-02-214417-058-1015ND
2019-02-214417-072-1030ND
2019-02-214417-077-0940ND
2019-02-274317-085-0941ND
2019-03-044317-075-1125ND
2019-03-064417-017-0835ND
2019-03-064317-052-1129ND
2019-03-124317-075-1106ND
2019-03-144317-063-0935ND
2019-03-144317-064-0943ND
2019-03-204317-075-1300ND
2019-04-024317-052-1200ND
2019-04-024317-060-1232ND
2019-04-024317-075-1352ND
2019-04-084317-067-1332ND
2019-04-084317-075-1347ND
2019-04-114417-058-1035ND
2019-04-114417-067-1220ND
2019-04-154417-006-1025ND
2019-04-154417-017-1120ND
2019-04-154417-023-1310ND
2019-04-154417-024-1230ND
2019-04-154317-067-1345ND
2019-04-154317-075-1401ND
2019-04-224317-067-1317ND
2019-04-224317-075-1254ND
2019-04-294317-075-1431ND
2019-04-304317-067-1450ND
2019-05-064317-075-0943ND
2019-06-034317-075-1010ND
2019-06-044317-052-1217ND
2019-06-274417-010-0745ND
2019-07-024317-060-1025ND
2019-07-024317-075-0827ND
2019-07-034317-052-0939ND
2019-07-184317-085-1040ND
2019-08-014417-058-1040ND
2019-08-014417-067-0845ND
2019-08-064317-052-1212ND
2019-08-064317-075-1422ND
2019-08-134317-075-1101ND
2019-08-214317-075-1030ND
2019-08-264317-075-1010ND
2019-09-034317-075-0945ND
2019-09-044317-052-1335ND
2019-09-054417-055-1405ND
2019-09-094317-075-1125ND
2019-09-184417-004-1030ND
2019-09-184317-075-1412ND
2019-09-244317-075-1312ND
2019-10-012706-075-1057ND
2019-10-022706-052-1332ND
2019-10-034417-055-1110ND
2019-10-034417-058-1135ND
2019-10-032706-058-1325ND
2019-10-074417-017-1130ND
2019-10-082706-052-1225ND
2019-10-092706-075-0820ND
2019-10-104417-067-0925ND
2019-10-142706-060-1023ND
2019-10-152706-058-1247ND
2019-10-152706-075-1315ND
2019-10-212706-075-1214ND
2019-10-282706-075-1230ND
2019-11-042706-075-1021ND
2019-11-072706-052-1028ND
2019-11-129588-075-0753ND
2019-11-259588-075-1045ND
2019-12-039588-075-0925ND
2019-12-049588-052-1035ND
2019-12-099588-075-1200ND
2019-12-179588-075-1421ND
2019-12-229588-075-0724ND
2019-12-319588-075-1325ND