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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Upland

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

 

140

Samples

0

Samples exceeding legal limit (MCL)

17

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.763 ppb325ND - 5.60 ppb
20150.969 ppb163ND - 5.30 ppb
20160.890 ppb204ND - 5.10 ppb
20170.627 ppb304ND - 5.10 ppb
20180.192 ppb241ND - 4.60 ppb
2019ND180ND

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
2014-01-149590-001-1045ND
2014-01-149590-023-1355ND
2014-01-149590-026-1330ND
2014-01-149590-038-0735ND
2014-01-149590-040-1258ND
2014-01-149590-045-11054.90 ppb
2014-04-309590-023-0814ND
2014-04-309590-026-0840ND
2014-04-309590-038-1107ND
2014-04-309590-040-0938ND
2014-04-309590-045-12444.80 ppb
2014-07-169590-023-1228ND
2014-07-169590-026-1246ND
2014-07-169590-038-0900ND
2014-07-169590-040-1116ND
2014-07-169590-045-15075.60 ppb
2014-09-259590-021-1000ND
2014-09-259590-023-1027ND
2014-09-259590-024-1240ND
2014-09-259590-026-1000ND
2014-09-259590-036-0750ND
2014-09-259590-038-0850ND
2014-09-259590-040-0930ND
2014-09-259590-045-12354.60 ppb
2014-09-259590-048-0920ND
2014-10-079590-004-0812ND
2014-10-079590-047-0920ND
2014-10-089590-023-1222ND
2014-10-089590-026-1245ND
2014-10-089590-038-0851ND
2014-10-089590-040-1311ND
2014-10-089590-045-15254.50 ppb
2015-01-139590-023-1224ND
2015-01-139590-026-0739ND
2015-01-139590-038-0855ND
2015-01-139590-040-1038ND
2015-01-139590-045-09505.30 ppb
2015-04-289590-023-1017ND
2015-04-289590-026-1039ND
2015-07-279590-023-0732ND
2015-07-279590-026-1008ND
2015-07-279590-038-0715ND
2015-07-279590-045-10325.00 ppb
2015-10-209590-023-0745ND
2015-10-209590-026-1005ND
2015-10-209590-038-0948ND
2015-10-209590-040-1040ND
2015-10-209590-045-10205.20 ppb
2016-01-279590-023-1124ND
2016-01-279590-026-1324ND
2016-01-279590-038-0935ND
2016-01-279590-040-1025ND
2016-01-279590-045-12545.10 ppb
2016-04-279590-023-1315ND
2016-04-279590-026-1107ND
2016-04-279590-038-0917ND
2016-04-279590-040-0753ND
2016-04-279590-045-13344.30 ppb
2016-07-209590-023-0730ND
2016-07-209590-026-0630ND
2016-07-209590-038-0726ND
2016-07-209590-040-1235ND
2016-07-209590-045-08254.00 ppb
2016-10-189590-023-0725ND
2016-10-189590-026-1115ND
2016-10-189590-038-0800ND
2016-10-189590-040-1320ND
2016-10-189590-045-12554.40 ppb
2017-01-279590-001-1200ND
2017-01-279590-023-0755ND
2017-01-279590-026-0745ND
2017-01-279590-038-1050ND
2017-01-279590-040-1020ND
2017-01-279590-045-01454.60 ppb
2017-02-029590-001-1110ND
2017-04-279590-001-0837ND
2017-04-279590-023-0947ND
2017-04-279590-026-0735ND
2017-04-279590-038-0825ND
2017-04-279590-040-1115ND
2017-04-279590-045-1130ND
2017-07-269590-001-0815ND
2017-07-269590-023-1430ND
2017-07-269590-026-1417ND
2017-07-269590-038-0942ND
2017-07-269590-040-0940ND
2017-07-269590-045-07124.20 ppb
2017-08-219590-036-0815ND
2017-08-239590-021-0831ND
2017-08-239590-024-0915ND
2017-08-239590-026-1215ND
2017-08-239590-045-08155.10 ppb
2017-10-259590-001-0745ND
2017-10-259590-023-0845ND
2017-10-259590-026-0823ND
2017-10-259590-038-1050ND
2017-10-259590-040-1038ND
2017-10-259590-045-11154.90 ppb
2018-01-319590-001-1110ND
2018-01-319590-023-0800ND
2018-01-319590-026-0816ND
2018-01-319590-038-0851ND
2018-01-319590-040-0947ND
2018-01-319590-045-13104.60 ppb
2018-06-069590-001-0935ND
2018-06-069590-023-0910ND
2018-06-069590-026-0925ND
2018-06-069590-038-0820ND
2018-06-069590-040-1019ND
2018-06-069590-045-1035ND
2018-07-259590-001-0900ND
2018-07-259590-023-1057ND
2018-07-259590-026-1037ND
2018-07-259590-038-0950ND
2018-07-259590-040-0842ND
2018-07-259590-045-1000ND
2018-10-249590-001-1212ND
2018-10-249590-023-0945ND
2018-10-249590-026-0920ND
2018-10-249590-038-0810ND
2018-10-249590-040-1055ND
2018-10-249590-045-0905ND
2019-01-309590-001-0830ND
2019-01-309590-023-0955ND
2019-01-309590-026-0931ND
2019-01-309590-038-0749ND
2019-01-309590-040-1301ND
2019-01-309590-045-1047ND
2019-04-249590-001-0835ND
2019-04-249590-023-0925ND
2019-04-249590-026-0908ND
2019-04-249590-040-1055ND
2019-07-249590-001-1115ND
2019-07-249590-026-0745ND
2019-07-249590-040-0845ND
2019-10-229590-040-0242ND
2019-10-239590-001-0833ND
2019-10-239590-023-0944ND
2019-10-239590-026-0928ND
2019-10-239590-040-1247ND