Know Your Environment. Protect Your Health.

Perchlorate

Ventura County Waterworks District No. 19 - Somis

NOTE: Ventura County Waterworks District No. 19 - Somis purchases water from Calleguas Municipal Water District which is required to test for perchlorate. Sample information shown below was taken by Calleguas Municipal Water District.

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.

 

50

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2018ND30ND
2019ND30ND
2020ND30ND
2021ND30ND
2022ND30ND
2023ND30ND

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

NOTE: Ventura County Waterworks District No. 19 - Somis purchases water from Calleguas Municipal Water District which is required to test for perchlorate. Sample information shown below was taken by Calleguas Municipal Water District.

Date Lab ID Result
2018-02-13CA5610050_015_015-201802131050ND
2018-02-13CA5610050_016_016-201802130945ND
2018-02-26CA5610050_004_004-201802260915ND
2018-02-26CA5610050_001_001-201802260830ND
2018-03-07CA5610050_013_013-201803071320ND
2018-03-08CA5610050_012_012-201803081000ND
2018-03-08CA5610050_014_014-201803081330ND
2018-04-30CA5610050_017_017-201804301030ND
2018-11-05CA5610050_004_004-201811050820ND
2019-01-29CA5610050_001_001-201901290900ND
2019-01-29CA5610050_004_004-201901290930ND
2019-02-04CA5610050_018_018-201902040945ND
2019-02-05CA5610050_022_022-201902051020ND
2019-02-05CA5610050_023_023-201902050945ND
2019-02-07CA5610050_020_020-201902070840ND
2019-02-11CA5610050_021_021-201902110930ND
2019-02-19CA5610050_019_019-201902191100ND
2019-11-04CA5610050_004_004-201911040800ND
2020-01-03CA5610050_007_007-202001031030ND
2020-01-07CA5610050_008_008-202001071030ND
2020-01-30CA5610050_001_001-202001300945ND
2020-01-30CA5610050_004_004-202001300930ND
2020-02-03CA5610050_011_011-202002030945ND
2020-02-10CA5610050_009_009-202002101145ND
2020-02-10CA5610050_006_006-202002101005ND
2020-02-12CA5610050_010_010-202002121110ND
2020-11-04CA5610050_004_004-202011040830ND
2021-02-10CA5610050_015_015-202102100830ND
2021-02-11CA5610050_004_004-202102110920ND
2021-02-11CA5610050_001_001-202102110820ND
2021-02-17CA5610050_017_017-202102171100ND
2021-02-17CA5610050_012_012-202102171000ND
2021-02-19CA5610050_013_013-202102191040ND
2021-02-22CA5610050_016_016-202102221117ND
2021-02-23CA5610050_014_014-202102231000ND
2022-01-03CA5610050_001_001-202201030846ND
2022-01-03CA5610050_004_004-202201030920ND
2022-01-04CA5610050_019_019-202201040850ND
2022-01-06CA5610050_023_023-202201060920ND
2022-01-13CA5610050_020_020-202201130950ND
2022-01-19CA5610050_018_018-202201191115ND
2022-01-19CA5610050_022_022-202201191200ND
2022-07-27CA5610050_021_021-202207271040ND
2023-03-15CA5610050_001_001-202303150945ND
2023-03-15CA5610050_004_004-202303150900ND
2023-03-21CA5610050_006_006-202303211000ND
2023-03-21CA5610050_008_008-202303211100ND
2023-03-22CA5610050_009_009-202303221140ND
2023-03-23CA5610050_007_007-202303230830ND
2023-09-21CA5610050_010_010-202309211250ND