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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Coachella Valley Water District: Cove Community

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

 

174

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND840ND
2015ND20ND
2016N/A00N/A
2017ND780ND
2018ND50ND
2019ND50ND

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
2014-04-024790-041-0848ND
2014-04-024790-088-1041ND
2014-04-024790-103-0915ND
2014-04-024790-109-1148ND
2014-04-024790-117-1038ND
2014-04-024790-128-0825ND
2014-04-024790-135-0945ND
2014-04-024790-143-0931ND
2014-04-024790-145-0951ND
2014-04-024790-154-1015ND
2014-04-024790-159-1212ND
2014-04-024790-172-1140ND
2014-04-024790-174-1021ND
2014-04-024790-182-1118ND
2014-04-024790-209-1052ND
2014-04-024790-215-0857ND
2014-04-024790-218-1006ND
2014-04-024790-219-1100ND
2014-04-084790-129-1328ND
2014-04-084790-130-1105ND
2014-04-084790-164-0945ND
2014-04-084790-167-1126ND
2014-04-084790-178-1042ND
2014-04-084790-198-1235ND
2014-04-084790-204-0925ND
2014-04-084790-210-1020ND
2014-04-154790-030-1045ND
2014-04-154790-155-1102ND
2014-04-154790-179-0942ND
2014-04-154790-205-1002ND
2014-04-154790-216-0923ND
2014-04-154790-217-0906ND
2014-04-154790-222-1019ND
2014-04-164790-011-1027ND
2014-04-164790-080-0856ND
2014-04-164790-084-1054ND
2014-04-164790-105-0813ND
2014-04-164790-134-0929ND
2014-04-164790-158-0947ND
2014-04-164790-173-0914ND
2014-04-164790-175-1035ND
2014-04-164790-194-0841ND
2014-04-164790-196-0952ND
2014-04-164790-200-1003ND
2014-04-164790-207-1128ND
2014-04-164790-212-1013ND
2014-04-224790-165-0939ND
2014-04-224790-206-0951ND
2014-04-234790-146-1042ND
2014-04-234790-160-0907ND
2014-04-234790-166-1058ND
2014-04-234790-176-0930ND
2014-04-234790-201-1022ND
2014-04-234790-203-0950ND
2014-04-234790-249-1015ND
2014-04-254790-223-0917ND
2014-04-304790-020-1021ND
2014-04-304790-022-0935ND
2014-04-304790-029-0952ND
2014-04-304790-042-0916ND
2014-04-304790-136-0843ND
2014-04-304790-169-1115ND
2014-04-304790-177-1055ND
2014-05-054790-279-1224ND
2014-05-074790-131-0951ND
2014-05-074790-199-0900ND
2014-05-204790-214-1102ND
2014-05-204790-220-0918ND
2014-05-204790-257-0848ND
2014-05-214790-023-1111ND
2014-05-214790-024-1049ND
2014-05-214790-106-0958ND
2014-05-214790-118-0841ND
2014-05-214790-125-0758ND
2014-05-214790-132-1035ND
2014-05-214790-168-0937ND
2014-05-214790-170-0824ND
2014-05-214790-202-0909ND
2014-05-284790-025-0908ND
2014-05-284790-032-0935ND
2014-06-044790-079-0931ND
2014-06-114790-221-1313ND
2014-07-154790-031-1637ND
2014-12-304790-073-1145ND
2015-04-144790-279-1032ND
2015-09-154790-279-0933ND
2017-01-239590-224-1045ND
2017-04-059590-042-0835ND
2017-04-059590-109-0957ND
2017-04-059590-128-0805ND
2017-04-059590-172-0945ND
2017-04-059590-182-1122ND
2017-04-059590-200-1043ND
2017-04-059590-203-0858ND
2017-04-059590-210-0952ND
2017-04-059590-212-0855ND
2017-04-059590-215-0805ND
2017-04-059590-216-0938ND
2017-04-059590-279-0935ND
2017-04-069590-029-0913ND
2017-04-069590-031-0848ND
2017-04-069590-041-1135ND
2017-04-069590-073-1018ND
2017-04-069590-105-1055ND
2017-04-069590-106-0940ND
2017-04-069590-117-0817ND
2017-04-069590-129-0946ND
2017-04-069590-136-0921ND
2017-04-069590-154-1110ND
2017-04-069590-159-1003ND
2017-04-069590-165-0945ND
2017-04-069590-173-0927ND
2017-04-069590-176-0833ND
2017-04-069590-194-0906ND
2017-04-069590-205-1035ND
2017-04-069590-214-0808ND
2017-04-069590-217-1110ND
2017-04-069590-218-0847ND
2017-04-069590-249-0827ND
2017-04-119590-011-1032ND
2017-04-119590-164-1110ND
2017-04-119590-166-0935ND
2017-04-119590-167-1012ND
2017-04-119590-168-1030ND
2017-04-119590-169-0950ND
2017-04-119590-201-1008ND
2017-04-119590-206-0940ND
2017-04-119590-219-0915ND
2017-04-119590-223-0910ND
2017-04-139590-125-1035ND
2017-04-139590-146-0945ND
2017-04-139590-170-1055ND
2017-04-139590-179-1145ND
2017-04-139590-207-1110ND
2017-04-139590-257-0915ND
2017-04-189590-209-1230ND
2017-05-239590-131-1000ND
2017-05-239590-145-0928ND
2017-05-239590-158-0945ND
2017-05-239590-199-0837ND
2017-06-019590-023-0907ND
2017-06-019590-132-0938ND
2017-06-019590-134-1010ND
2017-06-019590-160-0855ND
2017-06-019590-175-0840ND
2017-06-019590-177-0940ND
2017-06-019590-178-1033ND
2017-06-019590-222-1000ND
2017-06-139590-130-0920ND
2017-06-149590-079-0920ND
2017-06-149590-118-0921ND
2017-06-169590-202-0946ND
2017-07-129590-022-1020ND
2017-08-089590-024-1047ND
2017-08-089590-025-1008ND
2017-08-089590-155-1117ND
2017-08-169590-020-1215ND
2017-08-169590-030-1015ND
2017-08-169590-220-0917ND
2017-08-309590-032-0915ND
2017-08-309590-196-1030ND
2017-08-319590-174-1130ND
2017-08-319590-204-0905ND
2017-09-079590-080-0905ND
2018-03-149590-198-1010ND
2018-04-259590-221-0815ND
2018-05-309590-281-0948ND
2018-09-269590-282-1140ND
2018-11-309590-281-1039ND
2019-02-119590-282-0957ND
2019-05-159590-286-0800ND
2019-05-229590-224-0832ND
2019-12-239590-224-0905ND
2019-12-239590-289-0930ND