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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

City of Lodi

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

 

134

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014ND200ND
2015ND190ND
2016ND270ND
2017ND250ND
2018ND220ND
2019ND210ND

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
2014-05-051982-006-0700ND
2014-05-051982-029-1145ND
2014-05-051982-033-0645ND
2014-05-061982-002-1115ND
2014-05-061982-040-1140ND
2014-05-072920-018-0645ND
2014-05-072920-025-0630ND
2014-05-072920-028-0700ND
2014-05-202920-009-0825ND
2014-05-202920-012-0715ND
2014-05-202920-021-0730ND
2014-05-212920-019-1115ND
2014-05-212920-023-0645ND
2014-05-212920-025-0700ND
2014-05-212920-031-0630ND
2014-05-212920-048-1050ND
2014-05-222920-003-0740ND
2014-05-222920-016-0810ND
2014-05-222920-017-0710ND
2014-05-222920-046-0645ND
2015-05-055806-023-0840ND
2015-05-055806-048-0820ND
2015-05-065806-002-0810ND
2015-05-065806-016-0730ND
2015-05-065806-018-0930ND
2015-05-065806-029-0750ND
2015-05-075806-006-0940ND
2015-05-075806-033-1000ND
2015-05-135806-003-0940ND
2015-05-135806-012-1010ND
2015-05-135806-017-1040ND
2015-05-135806-019-0900ND
2015-05-135806-031-0920ND
2015-05-145806-046-0930ND
2015-05-205806-025-0920ND
2015-05-205806-040-0920ND
2015-05-215806-009-0810ND
2015-05-215806-021-0940ND
2015-05-215806-028-0920ND
2016-03-225806-049-0700ND
2016-06-015806-003-1050ND
2016-06-015806-017-1020ND
2016-06-025806-023-1020ND
2016-06-025806-028-0945ND
2016-06-085806-016-0855ND
2016-06-135806-002-0935ND
2016-06-135806-009-1030ND
2016-06-135806-018-1245ND
2016-06-135806-029-1000ND
2016-06-135806-040-1050ND
2016-06-135806-046-1320ND
2016-06-145806-048-1110ND
2016-06-155806-006-0815ND
2016-06-155806-021-0845ND
2016-06-155806-025-0915ND
2016-06-155806-033-0800ND
2016-06-165806-012-0745ND
2016-06-165806-019-0925ND
2016-06-165806-031-0850ND
2016-08-025806-033-0830ND
2016-08-105806-017-1230ND
2016-08-105806-031-1330ND
2016-08-165806-021-0850ND
2016-08-165806-023-0930ND
2016-08-185806-046-0820ND
2016-11-102706-041-0700ND
2017-01-052706-049-0845ND
2017-05-012706-002-1015ND
2017-05-012706-012-1100ND
2017-05-012706-028-1000ND
2017-05-012706-031-1045ND
2017-05-032706-019-1010ND
2017-05-032706-025-1020ND
2017-05-032706-029-1040ND
2017-05-032706-041-1100ND
2017-05-082706-006-1000ND
2017-05-082706-009-1210ND
2017-05-082706-016-1020ND
2017-05-082706-023-1100ND
2017-05-092706-017-1000ND
2017-05-092706-018-1020ND
2017-05-092706-033-0940ND
2017-05-162706-003-0900ND
2017-05-162706-048-1000ND
2017-08-011991-009-0720ND
2017-08-091991-025-1350ND
2017-08-091991-048-1350ND
2017-08-101991-040-0640ND
2017-08-141991-003-1315ND
2017-08-141991-012-0000ND
2017-08-141991-016-1340ND
2018-01-032706-049-1145ND
2018-05-022706-002-0830ND
2018-05-022706-041-0850ND
2018-05-072706-006-0850ND
2018-05-072706-019-0950ND
2018-05-072706-021-0800ND
2018-05-072706-023-0730ND
2018-05-072706-025-0920ND
2018-05-072706-029-0630ND
2018-05-072706-031-0700ND
2018-05-072706-040-1015ND
2018-05-152706-009-0740ND
2018-05-152706-012-0805ND
2018-05-152706-016-0830ND
2018-05-152706-018-0700ND
2018-05-152706-033-0720ND
2018-08-072706-018-1030ND
2018-08-072706-019-0840ND
2018-08-092706-002-0800ND
2018-08-092706-006-0735ND
2018-08-142706-029-0750ND
2018-09-252706-028-0700ND
2019-01-102706-049-0700ND
2019-05-012706-002-0840ND
2019-05-012706-019-0950ND
2019-05-012706-023-0730ND
2019-05-012706-028-0640ND
2019-05-012706-029-0920ND
2019-05-012706-041-0650ND
2019-05-065806-006-0820ND
2019-05-065806-009-0720ND
2019-05-065806-012-0800ND
2019-05-065806-016-0710ND
2019-05-065806-018-0735ND
2019-05-065806-021-0730ND
2019-05-065806-025-0920ND
2019-05-065806-031-0650ND
2019-05-065806-033-0905ND
2019-05-065806-040-0940ND
2019-08-152706-023-0920ND
2019-08-202706-021-1010ND
2019-08-202706-033-0805ND
2019-08-212706-041-1325ND