Know Your Environment. Protect Your Health.

Perchlorate

Marygold Mutual Water Company

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.

 

154

Samples

0

Samples exceeding legal limit (MCL)

144

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20183.80 ppb65ND - 4.90 ppb
20194.09 ppb2421ND - 5.60 ppb
20203.91 ppb3126ND - 5.70 ppb
20214.26 ppb3433ND - 5.50 ppb
20224.35 ppb34343.10 ppb - 5.60 ppb
20234.26 ppb25252.60 ppb - 5.20 ppb

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
2018-10-17CA3610028_006_006-201810171015ND
2018-10-24CA3610028_007_007-2018102410164.70 ppb
2018-11-07CA3610028_006_006-2018110710134.00 ppb
2018-11-14CA3610028_007_007-2018111410194.90 ppb
2018-12-05CA3610028_007_007-2018120510254.70 ppb
2018-12-19CA3610028_006_006-2018121910034.50 ppb
2019-01-09CA3610028_006_006-2019010910264.20 ppb
2019-01-16CA3610028_007_007-2019011609334.90 ppb
2019-02-06CA3610028_007_007-2019020610204.80 ppb
2019-02-20CA3610028_006_006-2019022010104.50 ppb
2019-03-13CA3610028_006_006-2019031310115.60 ppb
2019-03-20CA3610028_007_007-2019032010454.70 ppb
2019-04-10CA3610028_007_007-2019041009575.10 ppb
2019-04-24CA3610028_006_006-2019042410004.80 ppb
2019-05-01CA3610028_007_007-2019050110154.60 ppb
2019-05-15CA3610028_006_006-201905151048ND
2019-06-05CA3610028_006_006-2019060510395.20 ppb
2019-06-12CA3610028_007_007-2019061211174.90 ppb
2019-07-03CA3610028_007_007-2019070310374.50 ppb
2019-07-17CA3610028_006_006-201907171044ND
2019-08-07CA3610028_006_006-201908071034ND
2019-08-14CA3610028_007_007-2019081410574.50 ppb
2019-09-04CA3610028_007_007-20190904NUL4.40 ppb
2019-09-18CA3610028_006_006-2019091809154.60 ppb
2019-10-09CA3610028_006_006-2019100910304.00 ppb
2019-10-16CA3610028_007_007-2019101610154.80 ppb
2019-11-06CA3610028_007_007-2019110609474.60 ppb
2019-11-20CA3610028_006_006-2019112009534.00 ppb
2019-12-11CA3610028_006_006-2019121109254.50 ppb
2019-12-19CA3610028_007_007-2019121908164.90 ppb
2020-01-03CA3610028_006_006-2020010309054.50 ppb
2020-01-08CA3610028_007_007-2020010808484.70 ppb
2020-02-12CA3610028_006_006-2020021208174.50 ppb
2020-02-19CA3610028_007_007-2020021908044.80 ppb
2020-03-04CA3610028_006_006-2020030408264.90 ppb
2020-03-11CA3610028_007_007-2020031108075.40 ppb
2020-04-01CA3610028_007_007-2020040108124.70 ppb
2020-04-15CA3610028_006_006-2020041507594.70 ppb
2020-05-06CA3610028_006_006-2020050607524.10 ppb
2020-05-13CA3610028_007_007-2020051307584.40 ppb
2020-06-03CA3610028_007_007-2020060308074.80 ppb
2020-06-17CA3610028_006_006-2020061707224.80 ppb
2020-06-24CA3610028_007_007-2020062407355.70 ppb
2020-07-08CA3610028_006_006-2020070807435.00 ppb
2020-07-15CA3610028_007_007-2020071507454.10 ppb
2020-07-29CA3610028_006_006-2020072907264.90 ppb
2020-08-05CA3610028_007_007-2020080507385.00 ppb
2020-08-19CA3610028_006_006-202008190740ND
2020-08-26CA3610028_007_007-2020082607454.70 ppb
2020-09-09CA3610028_006_006-202009090943ND
2020-09-16CA3610028_007_007-2020091607474.60 ppb
2020-09-30CA3610028_006_006-202009300732ND
2020-10-07CA3610028_007_007-2020100708544.00 ppb
2020-10-21CA3610028_006_006-202010210750ND
2020-10-28CA3610028_007_007-2020102807404.20 ppb
2020-11-11CA3610028_006_006-202011110743ND
2020-11-18CA3610028_007_007-2020111807465.10 ppb
2020-12-02CA3610028_006_006-2020120207444.00 ppb
2020-12-09CA3610028_007_007-2020120907564.90 ppb
2020-12-23CA3610028_006_006-2020122307434.00 ppb
2020-12-30CA3610028_007_007-2020123007454.70 ppb
2021-01-13CA3610028_006_006-2021011307424.00 ppb
2021-01-20CA3610028_007_007-2021012007364.70 ppb
2021-02-03CA3610028_006_006-2021020307404.40 ppb
2021-02-10CA3610028_007_007-2021021007344.70 ppb
2021-02-24CA3610028_006_006-2021022407364.20 ppb
2021-03-17CA3610028_006_006-202103170735ND
2021-03-24CA3610028_007_007-2021032407504.50 ppb
2021-04-07CA3610028_006_006-2021040707304.00 ppb
2021-04-14CA3610028_007_007-2021041407444.50 ppb
2021-04-28CA3610028_006_006-2021042807364.60 ppb
2021-05-05CA3610028_007_007-2021050507335.50 ppb
2021-05-19CA3610028_006_006-2021051907294.80 ppb
2021-05-26CA3610028_007_007-2021052607534.40 ppb
2021-06-09CA3610028_006_006-2021060907404.40 ppb
2021-06-16CA3610028_007_007-2021061610314.70 ppb
2021-06-30CA3610028_006_006-2021063007354.70 ppb
2021-07-07CA3610028_007_007-2021070707424.70 ppb
2021-07-21CA3610028_006_006-2021072107343.70 ppb
2021-07-28CA3610028_007_007-2021072807284.60 ppb
2021-08-11CA3610028_006_006-20210811NUL3.40 ppb
2021-08-18CA3610028_007_007-2021081807393.80 ppb
2021-09-01CA3610028_006_006-2021090107473.40 ppb
2021-09-08CA3610028_007_007-2021090807534.80 ppb
2021-09-22CA3610028_006_006-2021092207343.60 ppb
2021-09-29CA3610028_007_007-2021092907355.10 ppb
2021-10-13CA3610028_006_006-2021101307353.60 ppb
2021-10-20CA3610028_007_007-2021102007325.00 ppb
2021-11-03CA3610028_006_006-2021110307373.90 ppb
2021-11-10CA3610028_007_007-2021111009325.50 ppb
2021-11-24CA3610028_006_006-2021112407314.10 ppb
2021-12-01CA3610028_007_007-2021120107314.50 ppb
2021-12-15CA3610028_006_006-2021121507333.90 ppb
2021-12-20CA3610028_006_006-2021122009504.10 ppb
2021-12-22CA3610028_007_007-2021122209455.00 ppb
2022-01-05CA3610028_006_006-2022010507244.10 ppb
2022-01-12CA3610028_007_007-2022011207405.30 ppb
2022-01-26CA3610028_006_006-2022012607104.00 ppb
2022-02-02CA3610028_007_007-2022020207245.00 ppb
2022-02-16CA3610028_006_006-2022021607254.70 ppb
2022-02-23CA3610028_007_007-2022022307215.60 ppb
2022-03-09CA3610028_006_006-2022030907434.50 ppb
2022-03-16CA3610028_007_007-2022031607324.90 ppb
2022-03-30CA3610028_006_006-2022033007024.50 ppb
2022-04-06CA3610028_007_007-2022040607235.00 ppb
2022-04-20CA3610028_006_006-2022042007063.40 ppb
2022-04-27CA3610028_007_007-2022042707045.00 ppb
2022-05-11CA3610028_006_006-2022051107033.30 ppb
2022-06-01CA3610028_006_006-2022060107004.70 ppb
2022-06-08CA3610028_007_007-2022060807143.20 ppb
2022-06-22CA3610028_006_006-2022062207043.10 ppb
2022-06-29CA3610028_007_007-2022062907134.80 ppb
2022-07-13CA3610028_006_006-2022071307153.30 ppb
2022-07-20CA3610028_007_007-2022072007055.10 ppb
2022-08-03CA3610028_006_006-2022080307124.00 ppb
2022-08-10CA3610028_007_007-2022081007185.30 ppb
2022-08-24CA3610028_006_006-2022082407043.40 ppb
2022-08-31CA3610028_007_007-2022083111055.20 ppb
2022-09-14CA3610028_006_006-2022091407153.50 ppb
2022-09-21CA3610028_007_007-2022092107305.60 ppb
2022-10-05CA3610028_006_006-2022100507203.70 ppb
2022-10-12CA3610028_007_007-2022101208004.60 ppb
2022-10-26CA3610028_006_006-2022102608003.60 ppb
2022-11-02CA3610028_007_007-2022110206555.00 ppb
2022-11-16CA3610028_006_006-2022111607403.50 ppb
2022-11-23CA3610028_007_007-2022112307154.40 ppb
2022-12-07CA3610028_006_006-2022120707053.40 ppb
2022-12-14CA3610028_007_007-2022121407104.40 ppb
2022-12-28CA3610028_006_006-2022122807204.90 ppb
2023-01-04CA3610028_007_007-2023010407004.80 ppb
2023-01-18CA3610028_006_006-2023011807053.50 ppb
2023-01-25CA3610028_007_007-2023012507104.80 ppb
2023-02-08CA3610028_006_006-2023020807004.20 ppb
2023-02-15CA3610028_007_007-2023021507004.60 ppb
2023-03-01CA3610028_006_006-2023030106554.10 ppb
2023-03-08CA3610028_007_007-2023030807104.10 ppb
2023-03-22CA3610028_006_006-2023032206454.50 ppb
2023-03-29CA3610028_007_007-2023032907004.80 ppb
2023-04-12CA3610028_006_006-2023041207003.40 ppb
2023-04-19CA3610028_007_007-2023041907104.60 ppb
2023-05-03CA3610028_006_006-2023050307254.80 ppb
2023-05-10CA3610028_007_007-2023051007004.70 ppb
2023-05-24CA3610028_006_006-2023052407054.50 ppb
2023-05-31CA3610028_007_007-2023053107004.20 ppb
2023-06-07CA3610028_007_007-2023060707003.70 ppb
2023-06-21CA3610028_006_006-2023062107005.00 ppb
2023-07-19CA3610028_006_006-2023071906452.60 ppb
2023-08-30CA3610028_006_006-2023083007003.90 ppb
2023-09-20CA3610028_006_006-2023092007583.70 ppb
2023-10-04CA3610028_007_007-2023100407005.00 ppb
2023-10-18CA3610028_006_006-2023101806553.10 ppb
2023-11-01CA3610028_007_007-2023110107005.00 ppb
2023-12-06CA3610028_007_007-2023120607005.20 ppb
2023-12-20CA3610028_006_006-2023122007003.70 ppb