Know Your Environment. Protect Your Health.

Perchlorate

Hillview Water Company-oakhurst/sierra Lakes

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.

 

61

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND190ND
2019ND20ND
2020ND130ND
2021ND120ND
2022N/A00N/A
2023ND150ND

ppb = parts per billion

State, National, and Health Guidelines for Drinking Water

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
2018-03-06CA2010007_032_032-201803061052ND
2018-03-06CA2010007_033_033-201803061106ND
2018-03-06CA2010007_034_034-201803061132ND
2018-03-06CA2010007_030_030-201803061015ND
2018-03-06CA2010007_031_031-201803061051ND
2018-04-30CA2010007_048_048-201804301432ND
2018-04-30CA2010007_047_047-201804301410ND
2018-04-30CA2010007_024_024-201804301445ND
2018-04-30CA2010007_046_046-201804301410ND
2018-05-08CA2010007_007_007-201805081000ND
2018-05-08CA2010007_028_028-201805080935ND
2018-05-09CA2010007_001_001-201805090905ND
2018-05-09CA2010007_002_002-201805090950ND
2018-05-25CA2010007_003_003-201805251022ND
2018-07-25CA2010007_009_009-201807251000ND
2018-07-25CA2010007_010_010-201807251025ND
2018-10-03CA2010007_046_046-201810030900ND
2018-10-03CA2010007_048_048-201810030950ND
2018-10-03CA2010007_047_047-201810030924ND
2019-12-11CA2010007_041_041-201912110905ND
2019-12-11CA2010007_039_039-201912110850ND
2020-06-08CA2010007_017_017-202006081043ND
2020-08-20CA2010007_032_032-202008201148ND
2020-08-20CA2010007_028_028-202008201132ND
2020-08-20CA2010007_039_039-202008201230ND
2020-08-20CA2010007_034_034-202008201112ND
2020-08-20CA2010007_007_007-202008201102ND
2020-08-20CA2010007_041_041-202008201215ND
2020-08-20CA2010007_033_033-202008201155ND
2020-08-20CA2010007_030_030-202008201127ND
2020-08-20CA2010007_031_031-202008201141ND
2020-08-20CA2010007_017_017-202008200820ND
2020-08-20CA2010007_003_003-202008201354ND
2020-08-20CA2010007_002_002-202008201343ND
2021-02-17CA2010007_040_040-202102171105ND
2021-08-11CA2010007_048_048-202108110908ND
2021-08-16CA2010007_046_046-202108160908ND
2021-08-16CA2010007_009_009-202108160908ND
2021-08-16CA2010007_047_047-202108160908ND
2021-08-16CA2010007_001_001-202108160808ND
2021-08-16CA2010007_010_010-202108160908ND
2021-08-16CA2010007_024_024-202108160908ND
2021-09-28CA2010007_048_048-202109280902ND
2021-09-28CA2010007_051_051-202109280757ND
2021-09-28CA2010007_047_047-202109280858ND
2021-09-28CA2010007_014_014-202109280800ND
2023-06-05CA2010007_034_034-202306051015ND
2023-06-05CA2010007_041_041-202306051012ND
2023-06-05CA2010007_040_040-202306051031ND
2023-06-05CA2010007_031_031-202306050945ND
2023-06-05CA2010007_030_030-202306050935ND
2023-06-05CA2010007_033_033-202306050958ND
2023-06-05CA2010007_032_032-202306050951ND
2023-06-05CA2010007_007_007-202306050915ND
2023-06-05CA2010007_039_039-202306051117ND
2023-06-06CA2010007_051_051-202306060820ND
2023-06-06CA2010007_003_003-202306060851ND
2023-06-06CA2010007_013_013-202306061000ND
2023-06-06CA2010007_017_017-202306060958ND
2023-06-06CA2010007_028_028-202306061014ND
2023-06-06CA2010007_002_002-202306060822ND