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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Gleanings For The Hungry

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

 

273

Samples

0

Samples exceeding legal limit (MCL)

1

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014N/A00N/A
2015ND110ND
2016ND460ND
2017ND600ND
2018ND720ND
20190.107 ppb841ND - 9.00 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
2015-11-045806-002-1030ND
2015-11-045806-006-1004ND
2015-11-045806-008-1044ND
2015-11-045806-009-1046ND
2015-11-045806-012-1102ND
2015-11-045806-013-1100ND
2015-12-025806-002-1322ND
2015-12-025806-010-1324ND
2015-12-025806-011-1326ND
2015-12-025806-015-1330ND
2015-12-025806-016-1332ND
2016-01-115806-002-1025ND
2016-01-115806-002-1027ND
2016-01-115806-003-1030ND
2016-01-115806-004-1034ND
2016-01-115806-005-1032ND
2016-01-115806-007-1035ND
2016-01-115806-021-1027ND
2016-02-235810-006-1310ND
2016-02-235810-008-1330ND
2016-02-235810-009-1325ND
2016-02-235810-012-1330ND
2016-02-235810-013-1320ND
2016-02-265810-002-1300ND
2016-03-105810-002-1040ND
2016-03-105810-010-1130ND
2016-03-105810-011-1049ND
2016-03-105810-014-1055ND
2016-03-105810-015-1100ND
2016-03-105810-016-1107ND
2016-04-075810-002-1050ND
2016-04-075810-003-1037ND
2016-04-075810-004-1105ND
2016-04-075810-005-1100ND
2016-04-075810-007-1155ND
2016-05-095810-002-1448ND
2016-06-025810-002-1316ND
2016-07-075810-002-1027ND
2016-08-015810-002-1435ND
2016-08-015810-009-1442ND
2016-09-015810-002-1103ND
2016-09-015810-007-1150ND
2016-09-015810-009-1110ND
2016-09-015810-011-1114ND
2016-09-015810-013-1139ND
2016-11-075810-002-1116ND
2016-11-075810-007-1126ND
2016-11-075810-009-1130ND
2016-11-075810-011-1133ND
2016-11-075810-013-1120ND
2016-11-075810-021-1111ND
2016-12-015810-002-1200ND
2016-12-015810-007-1205ND
2016-12-015810-009-1207ND
2016-12-015810-011-1210ND
2016-12-015810-013-1250ND
2016-12-015810-021-1156ND
2017-01-055810-002-1425ND
2017-01-055810-007-1430ND
2017-01-055810-009-1438ND
2017-01-055810-011-1440ND
2017-01-055810-013-1435ND
2017-01-055810-021-1420ND
2017-02-025810-002-1010ND
2017-02-025810-007-1015ND
2017-02-025810-009-1017ND
2017-02-025810-011-1020ND
2017-02-025810-013-1025ND
2017-02-025810-021-1005ND
2017-03-025810-002-1110ND
2017-03-025810-007-1115ND
2017-03-025810-009-1125ND
2017-03-025810-011-1128ND
2017-03-025810-013-1118ND
2017-03-025810-021-1105ND
2017-04-045810-002-1445ND
2017-04-045810-007-1450ND
2017-04-045810-009-1455ND
2017-04-045810-011-1455ND
2017-04-045810-013-1500ND
2017-04-045810-021-1440ND
2017-05-105810-002-1335ND
2017-05-105810-007-1550ND
2017-05-105810-009-1555ND
2017-05-105810-011-1557ND
2017-05-105810-013-1600ND
2017-05-105810-021-1330ND
2017-06-125810-002-1545ND
2017-06-125810-007-1548ND
2017-06-125810-009-1550ND
2017-06-125810-011-1552ND
2017-06-125810-013-1555ND
2017-06-125810-021-1540ND
2017-08-095810-002-1515ND
2017-08-095810-007-1520ND
2017-08-095810-009-1525ND
2017-08-095810-011-1530ND
2017-08-095810-013-1601ND
2017-08-095810-021-1510ND
2017-09-125810-002-1030ND
2017-09-125810-007-1040ND
2017-09-125810-009-1050ND
2017-09-125810-011-1055ND
2017-09-125810-013-1100ND
2017-09-125810-021-1010ND
2017-11-065810-002-1355ND
2017-11-065810-007-1400ND
2017-11-065810-009-1405ND
2017-11-065810-011-1410ND
2017-11-065810-013-1415ND
2017-11-065810-021-1350ND
2017-12-055810-002-1450ND
2017-12-055810-007-1455ND
2017-12-055810-009-1500ND
2017-12-055810-011-1505ND
2017-12-055810-013-1510ND
2017-12-055810-021-1445ND
2018-01-185810-002-1110ND
2018-01-185810-007-1150ND
2018-01-185810-009-1155ND
2018-01-185810-011-1200ND
2018-01-185810-013-1400ND
2018-01-185810-021-1105ND
2018-02-085810-002-1440ND
2018-02-085810-007-1445ND
2018-02-085810-009-1450ND
2018-02-085810-011-1455ND
2018-02-085810-013-1500ND
2018-02-085810-021-1435ND
2018-03-205810-002-1355ND
2018-03-205810-007-1400ND
2018-03-205810-009-1405ND
2018-03-205810-011-1410ND
2018-03-205810-013-1420ND
2018-03-205810-021-1350ND
2018-04-245810-002-1345ND
2018-04-245810-007-1350ND
2018-04-245810-009-1355ND
2018-04-245810-011-1300ND
2018-04-245810-013-1305ND
2018-04-245810-021-1340ND
2018-05-115810-002-0935ND
2018-05-115810-007-0940ND
2018-05-115810-009-0945ND
2018-05-115810-011-0950ND
2018-05-115810-013-0950ND
2018-05-115810-021-0930ND
2018-06-225810-002-1410ND
2018-06-225810-007-1415ND
2018-06-225810-009-1420ND
2018-06-225810-011-1425ND
2018-06-225810-013-1430ND
2018-06-225810-021-1405ND
2018-07-045810-002-1027ND
2018-07-045810-007-1055ND
2018-07-045810-009-1103ND
2018-07-045810-011-1105ND
2018-07-045810-013-1059ND
2018-07-045810-021-1039ND
2018-08-095810-002-1119ND
2018-08-095810-007-1231ND
2018-08-095810-009-1225ND
2018-08-095810-011-1220ND
2018-08-095810-013-1210ND
2018-08-095810-021-1127ND
2018-09-205810-002-1030ND
2018-09-205810-007-1156ND
2018-09-205810-009-1158ND
2018-09-205810-011-1159ND
2018-09-205810-013-1202ND
2018-09-205810-021-1025ND
2018-10-095810-002-1350ND
2018-10-095810-007-1400ND
2018-10-095810-009-1403ND
2018-10-095810-011-1407ND
2018-10-095810-013-1410ND
2018-10-095810-021-1343ND
2018-11-055810-002-1503ND
2018-11-055810-007-1533ND
2018-11-055810-009-1538ND
2018-11-055810-011-1547ND
2018-11-055810-013-1542ND
2018-11-055810-021-1459ND
2018-12-055810-002-1117ND
2018-12-055810-004-1148ND
2018-12-055810-005-1146ND
2018-12-055810-006-1152ND
2018-12-055810-007-1150ND
2018-12-055810-021-1053ND
2019-01-085810-002-1005ND
2019-01-085810-008-0955ND
2019-01-085810-009-0950ND
2019-01-085810-010-0945ND
2019-01-085810-011-0941ND
2019-01-085810-021-1000ND
2019-02-055810-002-13259.00 ppb
2019-02-055810-003-1340ND
2019-02-055810-007-1343ND
2019-02-055810-008-1433ND
2019-02-055810-010-1437ND
2019-02-055810-012-1439ND
2019-02-055810-014-1459ND
2019-02-055810-015-1502ND
2019-02-055810-016-1505ND
2019-02-085810-002-1545ND
2019-02-265810-002-1110ND
2019-03-115810-002-1348ND
2019-03-115810-005-1413ND
2019-03-115810-006-1426ND
2019-03-115810-007-1431ND
2019-03-115810-021-1347ND
2019-03-185810-002-1300ND
2019-03-185810-003-1330ND
2019-03-185810-004-1340ND
2019-04-115810-002-1330ND
2019-04-115810-008-1500ND
2019-04-115810-009-1350ND
2019-04-115810-010-1355ND
2019-04-115810-011-1400ND
2019-04-115810-021-1200ND
2019-05-085810-002-1620ND
2019-05-085810-012-1645ND
2019-05-085810-014-1650ND
2019-05-105810-013-1425ND
2019-05-105810-015-1430ND
2019-05-105810-016-1455ND
2019-05-165810-012-1430ND
2019-06-115810-002-1500ND
2019-06-115810-003-1510ND
2019-06-115810-004-1542ND
2019-06-115810-005-1545ND
2019-06-115810-006-1552ND
2019-06-115810-007-1551ND
2019-07-125810-002-1025ND
2019-07-125810-003-1030ND
2019-07-125810-004-1038ND
2019-07-125810-005-1035ND
2019-07-125810-006-1040ND
2019-07-125810-007-1055ND
2019-07-125810-021-1020ND
2019-08-195810-002-1355ND
2019-08-195810-008-1405ND
2019-08-195810-009-1400ND
2019-08-195810-021-1345ND
2019-09-265810-002-1125ND
2019-09-265810-010-1355ND
2019-09-265810-011-1335ND
2019-09-265810-012-1315ND
2019-09-265810-013-1200ND
2019-09-265810-014-1400ND
2019-09-265810-015-1422ND
2019-09-265810-016-1405ND
2019-09-265810-021-1100ND
2019-10-315810-002-1309ND
2019-10-315810-003-1315ND
2019-10-315810-005-1326ND
2019-10-315810-012-1330ND
2019-10-315810-021-1305ND
2019-11-275810-002-1330ND
2019-11-275810-003-1332ND
2019-11-275810-004-1340ND
2019-11-275810-006-1405ND
2019-11-275810-007-1410ND
2019-11-275810-008-1420ND
2019-11-275810-009-1430ND
2019-12-195810-002-1515ND
2019-12-195810-010-1525ND
2019-12-195810-011-1530ND
2019-12-195810-012-1555ND
2019-12-195810-013-1535ND
2019-12-195810-014-1600ND
2019-12-195810-015-1610ND
2019-12-195810-016-1615ND