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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Loma Linda

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

 

221

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014ND50ND
2015ND50ND
2016ND50ND
2017ND640ND
2018ND660ND
2019ND760ND

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
2014-02-053761-024-1020ND
2014-03-043761-018-1430ND
2014-04-013761-014-0900ND
2014-04-013761-017-0925ND
2014-04-013761-031-0945ND
2015-04-013761-014-1000ND
2015-04-013761-017-0810ND
2015-04-013761-018-1100ND
2015-04-013761-024-0900ND
2015-04-013761-031-1020ND
2016-04-053761-014-0940ND
2016-04-053761-017-0645ND
2016-04-053761-018-1050ND
2016-04-053761-024-0750ND
2016-04-053761-031-1020ND
2017-01-033761-024-1100ND
2017-01-033761-033-1430ND
2017-01-093761-033-1020ND
2017-01-173761-033-1010ND
2017-01-233761-033-1105ND
2017-02-013761-033-0840ND
2017-02-063761-033-1035ND
2017-02-133761-033-0830ND
2017-02-213761-024-1115ND
2017-02-213761-033-1040ND
2017-03-063761-033-1320ND
2017-03-143761-033-1035ND
2017-03-203761-033-0945ND
2017-03-273761-033-0945ND
2017-04-033761-033-1010ND
2017-04-043761-014-0935ND
2017-04-043761-018-1035ND
2017-04-043761-024-1050ND
2017-04-053761-017-0850ND
2017-04-053761-031-0920ND
2017-04-103761-033-1120ND
2017-04-183761-033-0815ND
2017-04-243761-033-0945ND
2017-05-013761-024-1400ND
2017-05-013761-033-1120ND
2017-05-083761-033-1355ND
2017-05-153761-033-1015ND
2017-05-223761-033-1115ND
2017-05-313761-033-0820ND
2017-06-053761-024-1030ND
2017-06-063761-033-0740ND
2017-06-123761-033-1045ND
2017-06-193761-033-0825ND
2017-06-263761-033-0910ND
2017-07-033761-024-1125ND
2017-07-033761-033-0855ND
2017-07-103761-033-0936ND
2017-07-173761-033-1055ND
2017-07-243761-033-1100ND
2017-08-013761-024-0810ND
2017-08-013761-033-0820ND
2017-08-073761-033-0910ND
2017-08-143761-033-0950ND
2017-08-213761-033-1140ND
2017-08-283761-033-1040ND
2017-09-053761-024-0955ND
2017-09-053761-033-1435ND
2017-09-123761-033-0845ND
2017-09-183761-033-0900ND
2017-09-253761-033-0840ND
2017-10-023761-024-0845ND
2017-10-023761-033-0855ND
2017-10-093761-033-0955ND
2017-10-163761-033-0925ND
2017-10-233761-033-1020ND
2017-10-303761-015-1010ND
2017-11-013761-024-1040ND
2017-11-073761-033-0745ND
2017-11-133761-033-0930ND
2017-11-203761-033-0825ND
2017-11-283761-033-0735ND
2017-12-053761-033-0940ND
2017-12-113761-033-0910ND
2017-12-263761-033-1115ND
2018-01-023761-033-1410ND
2018-01-083761-033-0950ND
2018-01-163761-033-1105ND
2018-01-223761-033-0840ND
2018-01-293761-033-0840ND
2018-02-013761-033-1100ND
2018-02-053761-033-1045ND
2018-02-123761-033-0930ND
2018-02-203761-033-0830ND
2018-02-263761-033-0910ND
2018-02-283761-024-1410ND
2018-03-063761-024-0945ND
2018-03-063761-033-0955ND
2018-03-123761-033-0900ND
2018-03-193761-033-0950ND
2018-03-263761-033-0950ND
2018-04-023761-017-1030ND
2018-04-033761-014-0700ND
2018-04-033761-018-0740ND
2018-04-033761-024-0805ND
2018-04-033761-031-0650ND
2018-04-033761-033-1340ND
2018-04-093761-033-1110ND
2018-04-163761-033-0755ND
2018-04-233761-033-0820ND
2018-04-303761-033-1000ND
2018-05-073761-033-0840ND
2018-05-143761-033-1010ND
2018-05-213761-033-0925ND
2018-05-293761-033-0910ND
2018-06-043761-033-1100ND
2018-06-113761-033-0830ND
2018-06-183761-033-0855ND
2018-06-253761-033-0915ND
2018-07-033761-033-1110ND
2018-07-093761-033-1500ND
2018-07-163761-033-0930ND
2018-07-243761-033-0740ND
2018-08-023761-033-0920ND
2018-08-073761-033-1120ND
2018-08-133761-033-1400ND
2018-08-203761-033-1110ND
2018-08-273761-033-1000ND
2018-09-053761-017-0830ND
2018-09-053761-033-0850ND
2018-09-123761-033-1020ND
2018-09-173761-033-1440ND
2018-09-183761-024-1040ND
2018-09-253761-033-0820ND
2018-10-013761-017-1120ND
2018-10-033761-024-0900ND
2018-10-033761-033-0910ND
2018-10-083761-033-0955ND
2018-10-163761-033-0840ND
2018-10-223761-033-1350ND
2018-10-293761-033-1040ND
2018-11-053761-033-1035ND
2018-11-063761-024-1010ND
2018-11-133761-033-1050ND
2018-11-203761-033-0750ND
2018-11-273761-033-0820ND
2018-12-053761-024-0825ND
2018-12-053761-033-1350ND
2018-12-103761-033-1020ND
2018-12-183761-033-0915ND
2018-12-263761-033-1430ND
2019-01-023761-033-1115ND
2019-01-073761-017-1510ND
2019-01-073761-024-1100ND
2019-01-083761-033-1015ND
2019-01-143761-033-1100ND
2019-01-243761-033-0820ND
2019-01-283761-033-1040ND
2019-02-053761-024-0930ND
2019-02-053761-033-1330ND
2019-02-113761-033-1130ND
2019-02-193761-033-1050ND
2019-02-253761-033-1340ND
2019-03-043761-024-1520ND
2019-03-043761-033-1010ND
2019-03-113761-033-1420ND
2019-03-193761-033-1010ND
2019-03-253761-033-1020ND
2019-04-023761-017-0950ND
2019-04-023761-031-1440ND
2019-04-023761-033-1115ND
2019-04-033761-018-0815ND
2019-04-033761-024-0900ND
2019-04-083761-033-1430ND
2019-04-163761-033-0910ND
2019-04-223761-033-0940ND
2019-05-013761-014-0810ND
2019-05-013761-024-1030ND
2019-05-023761-033-0730ND
2019-05-063761-033-1150ND
2019-05-133761-033-1100ND
2019-05-203761-033-1120ND
2019-05-283761-033-0955ND
2019-06-043761-024-0720ND
2019-06-103761-033-0940ND
2019-06-173761-033-0850ND
2019-06-243761-033-1030ND
2019-07-013761-024-1100ND
2019-07-023761-033-1100ND
2019-07-083761-033-1030ND
2019-07-153761-033-1040ND
2019-07-223761-033-1000ND
2019-07-293761-033-1010ND
2019-08-013761-014-0730ND
2019-08-013761-017-0750ND
2019-08-013761-024-0910ND
2019-08-013761-031-1410ND
2019-08-013761-033-0930ND
2019-08-053761-033-1400ND
2019-08-123761-033-1010ND
2019-08-193761-033-0950ND
2019-08-263761-033-1130ND
2019-09-013761-017-0750ND
2019-09-033761-033-1110ND
2019-09-043761-024-1120ND
2019-09-113761-033-0820ND
2019-09-163761-033-1050ND
2019-09-233761-033-1410ND
2019-10-013761-024-0900ND
2019-10-013761-033-0720ND
2019-10-073761-033-1025ND
2019-10-153761-033-0800ND
2019-10-213761-033-1126ND
2019-10-283761-033-1110ND
2019-11-053761-017-1040ND
2019-11-053761-024-1440ND
2019-11-063761-033-1010ND
2019-11-123761-033-0920ND
2019-11-183761-033-0900ND
2019-11-263761-033-0950ND
2019-12-023761-017-1430ND
2019-12-023761-024-1115ND
2019-12-033761-033-0810ND
2019-12-093761-033-0950ND
2019-12-163761-033-1210ND
2019-12-233761-033-0840ND
2019-12-303761-033-0810ND