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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Chino Hills

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

 

325

Samples

0

Samples exceeding legal limit (MCL)

8

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20140.173 ppb1807ND - 5.10 ppb
2015ND740ND
2016ND110ND
20170.0943 ppb531ND - 5.00 ppb
2018ND30ND
2019ND40ND

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
2014-01-234790-001-1100ND
2014-01-234790-001-1300ND
2014-01-234790-017-1045ND
2014-01-234790-017-1330ND
2014-01-234790-022-1245ND
2014-01-294790-001-0745ND
2014-01-294790-017-0800ND
2014-01-294790-022-0830ND
2014-02-054790-001-0730ND
2014-02-054790-017-0745ND
2014-02-054790-022-0810ND
2014-02-124790-001-0915ND
2014-02-124790-017-0930ND
2014-02-124790-022-0940ND
2014-02-194790-001-0845ND
2014-02-194790-017-0900ND
2014-02-194790-022-0825ND
2014-02-264790-001-0815ND
2014-02-264790-017-0800ND
2014-02-264790-022-0830ND
2014-03-114790-001-1240ND
2014-03-114790-017-1300ND
2014-03-114790-022-1100ND
2014-03-204790-001-1320ND
2014-03-204790-017-1340ND
2014-03-204790-022-1300ND
2014-03-264790-001-0830ND
2014-03-264790-017-0845ND
2014-03-264790-022-0855ND
2014-04-024790-001-1230ND
2014-04-024790-017-1240ND
2014-04-024790-022-1130ND
2014-04-034790-009-1040ND
2014-04-034790-010-1035ND
2014-04-094790-001-1225ND
2014-04-094790-009-1200ND
2014-04-094790-017-1140ND
2014-04-094790-022-1110ND
2014-04-164790-001-0735ND
2014-04-164790-009-08154.20 ppb
2014-04-164790-010-08054.50 ppb
2014-04-164790-017-0755ND
2014-04-164790-022-0830ND
2014-04-234790-001-0715ND
2014-04-234790-009-07554.80 ppb
2014-04-234790-010-07455.10 ppb
2014-04-234790-017-0730ND
2014-04-234790-022-0820ND
2014-05-024790-001-1245ND
2014-05-024790-009-1300ND
2014-05-024790-010-13104.20 ppb
2014-05-024790-017-1255ND
2014-05-024790-022-1320ND
2014-05-074790-001-0845ND
2014-05-074790-009-0920ND
2014-05-074790-010-0915ND
2014-05-074790-017-0900ND
2014-05-074790-022-0940ND
2014-05-144790-001-0745ND
2014-05-144790-009-0820ND
2014-05-144790-010-0810ND
2014-05-144790-017-0800ND
2014-05-144790-022-0835ND
2014-05-214790-001-1225ND
2014-05-214790-009-1200ND
2014-05-214790-010-1145ND
2014-05-214790-017-1125ND
2014-05-214790-022-1215ND
2014-05-284790-001-0730ND
2014-05-284790-009-0820ND
2014-05-284790-010-0815ND
2014-05-284790-017-0800ND
2014-05-284790-022-0830ND
2014-06-044790-001-0830ND
2014-06-044790-009-0905ND
2014-06-044790-010-0900ND
2014-06-044790-017-0845ND
2014-06-044790-022-0915ND
2014-06-114790-001-0730ND
2014-06-114790-009-0815ND
2014-06-114790-010-0805ND
2014-06-114790-017-0745ND
2014-06-114790-022-0830ND
2014-06-184790-001-0820ND
2014-06-184790-009-0840ND
2014-06-184790-010-0850ND
2014-06-184790-017-0905ND
2014-06-184790-022-0945ND
2014-06-254790-001-0725ND
2014-06-254790-009-0810ND
2014-06-254790-010-0800ND
2014-06-254790-017-0745ND
2014-06-254790-022-0830ND
2014-07-024790-001-1005ND
2014-07-024790-009-0947ND
2014-07-024790-010-09404.10 ppb
2014-07-024790-017-0930ND
2014-07-024790-022-0855ND
2014-07-094790-001-0715ND
2014-07-094790-009-0750ND
2014-07-094790-010-0740ND
2014-07-094790-017-0725ND
2014-07-094790-022-0830ND
2014-07-184790-001-1015ND
2014-07-184790-009-1030ND
2014-07-184790-010-1035ND
2014-07-184790-017-1050ND
2014-07-184790-022-1120ND
2014-07-234790-001-0715ND
2014-07-234790-009-0740ND
2014-07-234790-010-0730ND
2014-07-234790-017-0800ND
2014-07-234790-022-1030ND
2014-07-294790-014-1030ND
2014-07-304790-001-0710ND
2014-07-304790-009-0735ND
2014-07-304790-010-0745ND
2014-07-304790-017-0810ND
2014-07-304790-022-1030ND
2014-08-064790-001-0720ND
2014-08-064790-009-0735ND
2014-08-064790-010-0745ND
2014-08-064790-017-0800ND
2014-08-064790-022-0745ND
2014-08-134790-001-0700ND
2014-08-134790-009-0730ND
2014-08-134790-010-0720ND
2014-08-134790-017-0750ND
2014-08-134790-022-0900ND
2014-08-204790-001-0700ND
2014-08-204790-010-0720ND
2014-08-204790-017-0730ND
2014-08-204790-022-1040ND
2014-08-274790-001-0710ND
2014-08-274790-010-0725ND
2014-08-274790-017-0740ND
2014-08-274790-022-1030ND
2014-09-034790-001-0710ND
2014-09-034790-010-0720ND
2014-09-034790-017-0740ND
2014-09-034790-022-1040ND
2014-09-104790-001-0745ND
2014-09-104790-010-0800ND
2014-09-104790-017-0830ND
2014-09-104790-022-1020ND
2014-09-174790-001-0800ND
2014-09-254790-001-0700ND
2014-09-254790-010-0720ND
2014-09-254790-017-0740ND
2014-09-254790-022-1040ND
2014-10-014790-001-0740ND
2014-10-014790-010-0800ND
2014-10-014790-017-0800ND
2014-10-014790-022-1000ND
2014-10-024790-009-1330ND
2014-10-084790-001-0705ND
2014-10-084790-009-0720ND
2014-10-084790-010-0720ND
2014-10-084790-017-0735ND
2014-10-084790-022-1045ND
2014-10-154790-001-0700ND
2014-10-154790-009-0725ND
2014-10-154790-010-0720ND
2014-10-154790-017-0735ND
2014-10-154790-022-1040ND
2014-11-194790-001-0720ND
2014-11-194790-009-0740ND
2014-11-194790-010-0745ND
2014-11-194790-017-0805ND
2014-11-194790-022-1000ND
2014-12-044790-001-0725ND
2014-12-044790-009-0755ND
2014-12-044790-010-0750ND
2014-12-044790-017-0811ND
2014-12-044790-022-1015ND
2014-12-154790-001-0735ND
2014-12-154790-009-0755ND
2014-12-154790-010-07454.30 ppb
2014-12-154790-017-0815ND
2014-12-154790-022-1030ND
2015-03-124790-001-0715ND
2015-03-124790-009-0740ND
2015-03-124790-010-0730ND
2015-03-124790-017-0800ND
2015-03-124790-022-1000ND
2015-03-184790-001-0815ND
2015-03-184790-009-0946ND
2015-03-184790-010-1000ND
2015-03-184790-017-0900ND
2015-03-184790-022-1015ND
2015-03-254790-001-0800ND
2015-04-014790-001-0830ND
2015-04-014790-009-0900ND
2015-04-014790-010-0845ND
2015-04-014790-017-0915ND
2015-04-014790-022-1040ND
2015-04-084790-001-0750ND
2015-04-084790-009-0815ND
2015-04-084790-010-0806ND
2015-04-084790-017-0840ND
2015-04-084790-022-0955ND
2015-04-154790-001-0751ND
2015-04-154790-009-0815ND
2015-04-154790-010-0808ND
2015-04-154790-017-0826ND
2015-04-154790-022-1045ND
2015-04-224790-001-0753ND
2015-04-224790-009-0840ND
2015-04-224790-010-0831ND
2015-04-224790-017-0907ND
2015-04-224790-022-1115ND
2015-04-294790-001-0725ND
2015-04-294790-009-0750ND
2015-04-294790-010-0746ND
2015-04-294790-017-0805ND
2015-04-294790-022-0826ND
2015-05-064790-022-0800ND
2015-05-134790-022-0928ND
2015-05-214790-022-0825ND
2015-05-274790-022-0950ND
2015-06-034790-022-1100ND
2015-06-114790-022-1042ND
2015-06-174790-022-0955ND
2015-06-244790-022-1020ND
2015-07-014790-022-0725ND
2015-07-084790-022-1045ND
2015-07-154790-001-0720ND
2015-07-154790-009-0804ND
2015-07-154790-010-0752ND
2015-07-154790-017-0836ND
2015-07-154790-022-1052ND
2015-07-234790-022-1031ND
2015-07-284790-022-1003ND
2015-08-044790-001-0733ND
2015-08-044790-009-0754ND
2015-08-044790-010-0747ND
2015-08-044790-017-0832ND
2015-08-044790-022-0907ND
2015-08-124790-022-1000ND
2015-08-194790-022-1000ND
2015-08-264790-022-0928ND
2015-09-014790-022-1036ND
2015-09-234790-022-1014ND
2015-09-304790-022-1040ND
2015-10-074790-022-0836ND
2015-10-144790-022-1130ND
2015-10-214790-001-1137ND
2015-10-214790-009-1053ND
2015-10-214790-010-1030ND
2015-10-214790-017-1030ND
2015-10-214790-022-0827ND
2015-10-284790-022-1010ND
2015-11-044790-022-1102ND
2015-11-104790-022-0835ND
2016-03-034790-014-1130ND
2016-03-034790-024-1030ND
2016-04-264790-001-1045ND
2016-04-264790-009-1115ND
2016-04-264790-010-1100ND
2016-09-219588-001-1050ND
2016-11-169588-017-1050ND
2016-11-169588-022-1130ND
2016-11-239588-022-1035ND
2016-12-099588-022-1015ND
2016-12-139588-022-0810ND
2017-01-189588-022-0800ND
2017-02-029588-022-1116ND
2017-02-099588-022-1136ND
2017-02-159588-022-1101ND
2017-02-169588-001-1010ND
2017-02-169588-014-0950ND
2017-02-169588-017-1040ND
2017-02-229588-022-0804ND
2017-03-084790-022-1018ND
2017-04-114790-001-0815ND
2017-04-114790-017-0847ND
2017-04-114790-022-0905ND
2017-04-189588-022-0953ND
2017-04-199588-009-1030ND
2017-04-199588-010-0945ND
2017-04-254790-022-1048ND
2017-05-024790-022-0821ND
2017-05-094790-022-1050ND
2017-05-164790-022-1143ND
2017-05-234790-022-0730ND
2017-05-309588-022-0810ND
2017-06-064790-022-0750ND
2017-06-134790-022-0946ND
2017-06-204790-022-0755ND
2017-06-274790-022-1113ND
2017-07-034790-022-1007ND
2017-07-114790-022-0820ND
2017-07-189588-022-1107ND
2017-08-084790-022-1005ND
2017-08-164790-022-1110ND
2017-08-224790-022-1037ND
2017-08-299588-022-0816ND
2017-09-054790-022-07585.00 ppb
2017-09-124790-022-0840ND
2017-09-139588-024-1200ND
2017-09-149588-014-1410ND
2017-09-194790-022-1000ND
2017-09-269588-022-0820ND
2017-10-049588-022-1045ND
2017-10-114790-001-0735ND
2017-10-114790-010-0904ND
2017-10-114790-017-0830ND
2017-10-114790-022-0923ND
2017-10-174790-022-1043ND
2017-10-259588-022-1230ND
2017-11-029588-022-0950ND
2017-11-089588-022-1030ND
2017-11-144790-022-0840ND
2017-11-204790-022-0813ND
2017-11-289588-022-1048ND
2017-12-069588-022-0907ND
2017-12-199588-022-0803ND
2017-12-264790-022-1015ND
2018-03-219588-024-1000ND
2018-06-284790-010-1215ND
2018-06-284790-024-1140ND
2019-05-164790-014-0902ND
2019-11-204790-014-0845ND
2019-11-264790-014-0820ND
2019-11-264790-024-1000ND