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Perchlorate

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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.

 

573

Samples

0

Samples exceeding legal limit (MCL)

0

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20105.39 ppb8175ND - 14.3 ppb
20113.60 ppb4942ND - 11.5 ppb
20123.28 ppb6551ND - 14.8 ppb
20133.77 ppb11589ND - 14.0 ppb
20143.44 ppb139102ND - 13.8 ppb
20153.26 ppb12494ND - 13.2 ppb

ppb = parts per billion.

State and national drinking water standards and health guidelines

Health Guideline 1 ppb

The 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
2010-01-141001412-001A-POCS5.50 ppb
2010-01-141001412-003A4.80 ppb
2010-01-141001412-004A4.80 ppb
2010-01-271001814-004A-POCS10.7 ppb
2010-01-271001814-003A-POCS4.70 ppb
2010-01-271001814-006A5.10 ppb
2010-02-161002485-003A5.40 ppb
2010-02-161002485-001A-POCS6.40 ppb
2010-02-161002485-004A5.10 ppb
2010-02-231002785-004A5.00 ppb
2010-02-231002785-002A-POCS10.6 ppb
2010-02-231002785-001A-POCS4.20 ppb
2010-03-171003658-004A5.20 ppb
2010-03-171003658-001A-POCS7.80 ppb
2010-03-171003658-002A-POCS5.80 ppb
2010-03-231003855-001A-POCS4.80 ppb
2010-03-231003855-002A-POCS12.5 ppb
2010-03-231003855-004A5.10 ppb
2010-04-131004562-001A-POCS9.20 ppb
2010-04-131004562-004A6.10 ppb
2010-04-131004562-003A6.40 ppb
2010-04-141004608-001A-PRI3.00 ppb
2010-04-201004904-002A-POCS13.2 ppb
2010-04-201004904-001A-POCS5.70 ppb
2010-05-241006254-003A5.60 ppb
2010-05-241006254-002A-POCS7.20 ppb
2010-05-241006254-001A5.20 ppb
2010-05-261006347-005A6.90 ppb
2010-05-261006347-002A-POCS14.3 ppb
2010-05-261006347-001A-POCS4.40 ppb
2010-06-141007025-001A-POCS5.00 ppb
2010-06-141007025-004A6.00 ppb
2010-06-141007025-003A-POCS6.90 ppb
2010-06-181007255-002A-PRIND
2010-06-181007255-001B1.90 ppb
2010-06-181007255-003A-PRIND
2010-06-181007255-002BND
2010-06-181007255-001A-PRI1.90 ppb
2010-06-181007255-003BND
2010-06-23100740-002A-POCS8.80 ppb
2010-06-231007410-003A-POCS2.40 ppb
2010-06-231007410-001A-POCS3.60 ppb
2010-06-231007410-005A5.30 ppb
2010-07-141008176-005A6.00 ppb
2010-07-141008176-002A-POCS10.2 ppb
2010-07-141008176-003A-POCS2.90 ppb
2010-07-141008176-001A-POCS4.10 ppb
2010-07-211008501-001A6.90 ppb
2010-07-211008501-003A4.80 ppb
2010-07-211008501-004A5.50 ppb
2010-08-101009275-001A-POCS6.80 ppb
2010-08-101009275-003A5.10 ppb
2010-08-101009275-004A5.40 ppb
2010-08-241009901-005A5.30 ppb
2010-08-241009901-001A-POCS4.20 ppb
2010-08-241009901-003A-POCS2.30 ppb
2010-08-241009901-002A-POCS11.7 ppb
2010-09-141010664-003A-POCS2.10 ppb
2010-09-141010664-005A6.50 ppb
2010-09-141010664-001A-POCS4.50 ppb
2010-09-141010664-002A-POCS11.4 ppb
2010-09-161010772-001A-POCS2.10 ppb
2010-09-201010880-001A-POCS5.90 ppb
2010-09-201010880-004A5.00 ppb
2010-09-201010880-003A4.20 ppb
2010-09-291011320-001A1.40 ppb
2010-09-291011320-002A-POCSND
2010-10-251010884-001-POCS4.70 ppb
2010-10-251010884-0035.00 ppb
2010-10-251010884-0045.10 ppb
2010-10-281010A08-001-POCS4.00 ppb
2010-10-281010A08-002-POCS8.20 ppb
2010-10-281010A08-003-POCS3.90 ppb
2010-11-021011053-001-PRIND
2010-11-151011521-0053.00 ppb
2010-11-151011521-001-PRI5.70 ppb
2010-11-181011722-003-PRI2.50 ppb
2010-11-181011722-002-PRI13.0 ppb
2010-11-181011722-001-PRI3.80 ppb
2010-12-091012390-001-PRI1.20 ppb
2010-12-211012847-002A9.80 ppb
2011-03-151103594-001-POCSND
2011-03-241103907-002A4.60 ppb
2011-03-241103907-003A4.60 ppb
2011-03-241103907-001A7.50 ppb
2011-03-311103B40-002-PRIND
2011-04-191104819-0034.70 ppb
2011-04-191104819-001-POCS4.90 ppb
2011-04-191104819-0026.10 ppb
2011-04-201104857-002ND
2011-04-201104857-0011.90 ppb
2011-05-181105754-011-PRI1.70 ppb
2011-06-131106560-0043.90 ppb
2011-06-131106560-001-POCS5.50 ppb
2011-06-131106560-0034.50 ppb
2011-06-171106841-002-PRI2.00 ppb
2011-06-171106841-001-PRI1.50 ppb
2011-07-111107308-034.70 ppb
2011-07-111107308-0044.90 ppb
2011-07-111107308-001-POCS4.40 ppb
2011-07-111107309-001-PRI11.5 ppb
2011-07-181107654-002-POCS3.00 ppb
2011-07-181107654-001-POCS5.20 ppb
2011-07-191107718-003-POCS2.10 ppb
2011-07-191107718-002-POCS1.70 ppb
2011-07-251107974-002-POCSND
2011-07-251107974-001-POCS1.70 ppb
2011-07-251107974-003-POCSND
2011-09-061109122-001-POCS5.10 ppb
2011-09-061109122-0035.20 ppb
2011-09-061109084-001-POCS2.20 ppb
2011-09-061109122-0044.50 ppb
2011-09-071109168-0013.90 ppb
2011-09-121109368-001-POCS1.50 ppb
2011-09-131109423-001-POCS3.50 ppb
2011-09-131109423-002-POCS10.5 ppb
2011-09-131109423-003-POCS3.80 ppb
2011-10-041110059-001-POCS3.60 ppb
2011-10-041110059-0044.10 ppb
2011-10-041110059-0033.70 ppb
2011-10-141110499-001ND
2011-10-141110499-0031.70 ppb
2011-10-141110499-0027.20 ppb
2011-11-071111253-001-POCS4.10 ppb
2011-11-301111A10-0013.70 ppb
2011-12-131112492-002-POCS4.30 ppb
2011-12-131112492-001-PRI4.00 ppb
2011-12-191112732-001-PRI4.70 ppb
2011-12-191112732-0022.70 ppb
2011-12-191112733-001ND
2012-01-241201755-001-POCS4.20 ppb
2012-01-241201755-0033.40 ppb
2012-01-251201823-0013.10 ppb
2012-02-151202549-001-PRI4.10 ppb
2012-02-151202549-003-PRI5.10 ppb
2012-02-151202549-0044.70 ppb
2012-03-051203120-0034.30 ppb
2012-03-051203120-001-POCS4.80 ppb
2012-04-091204344-0013.50 ppb
2012-04-091204340-001-POCS4.00 ppb
2012-04-181204764-0013.60 ppb
2012-05-021205092-001-POCS5.90 ppb
2012-05-031205160-001-POCS1.60 ppb
2012-06-041206037-0034.10 ppb
2012-06-041206037-001-POCS3.70 ppb
2012-06-271206B33-001-SEC3.40 ppb
2012-06-271206B33-002-POC SND
2012-07-111207442-001-POCSND
2012-07-111207442-002-POCSND
2012-07-161207673-001-POCSND
2012-07-171207793-001ND
2012-07-181207851-001-POCS1.90 ppb
2012-07-181207851-002-POCS3.60 ppb
2012-07-231207A57-001-POCS6.00 ppb
2012-07-231207A57-0045.90 ppb
2012-07-231207A57-0035.30 ppb
2012-08-061208209-001-POCS6.00 ppb
2012-08-061208209-0035.20 ppb
2012-08-061208209-0045.10 ppb
2012-08-291208E82-004-POCS2.40 ppb
2012-08-291208E82-001-POCSND
2012-08-291208E82-002-POCSND
2012-08-291208E82-003-POCS1.80 ppb
2012-09-051209121-001-POCSFND
2012-09-191209975-001-POCSND
2012-09-191209975-002-POCS2.20 ppb
2012-09-241209B83-0032.90 ppb
2012-09-241209B83-001-POCS4.60 ppb
2012-09-251209C71-003-POCS3.30 ppb
2012-09-251209C71-002-POCS4.40 ppb
2012-09-251209C71-001-POCS4.80 ppb
2012-09-261209D64-003-POCS4.30 ppb
2012-09-261209D64-004-POCS1.40 ppb
2012-09-261209D64-001-POCS4.20 ppb
2012-09-261209D64-002-POCS14.8 ppb
2012-10-031210233-001-POCSND
2012-10-101210552-0043.60 ppb
2012-10-101210552-0032.90 ppb
2012-10-101210552-001-POCS4.20 ppb
2012-10-241210D16-0033.40 ppb
2012-10-241210D16-004ND
2012-10-241210D16-0014.30 ppb
2012-10-241210D16-0025.50 ppb
2012-11-131211476-001-POCSND
2012-11-131211474-001-POCS7.60 ppb
2012-11-131211476-0036.80 ppb
2012-12-051212177-0042.80 ppb
2012-12-051212177-001-POCS2.60 ppb
2012-12-051212177-002-POCS3.20 ppb
2012-12-171212822-001-PRIND
2012-12-171212837-0012.80 ppb
2012-12-181212921-003-PRI3.20 ppb
2012-12-181212921-002-PRIND
2012-12-181212921-004-PRI2.30 ppb
2012-12-181212921-001-PRI4.60 ppb
2013-01-081301277-0034.60 ppb
2013-01-081301277-004-POCS2.20 ppb
2013-01-081301277-001-POCSND
2013-02-041302060-001-PRI2.80 ppb
2013-02-061302202-001-PRIND
2013-02-061302202-002-PRIND
2013-02-131302475-004-POCS2.40 ppb
2013-02-131302475-003-POCS4.20 ppb
2013-02-131302475-002-POCS14.0 ppb
2013-02-131302475-001-POCS5.30 ppb
2013-02-201302780-0025.60 ppb
2013-02-201302779-001-POCS5.40 ppb
2013-02-201302779-002-POCS3.30 ppb
2013-03-051303126-001-POCS8.10 ppb
2013-03-051303126-003-POCS5.30 ppb
2013-03-051303126-0045.50 ppb
2013-03-111303436-001-POCSND
2013-03-111303436-002-POCSND
2013-03-181303812-001-POCS5.90 ppb
2013-03-181303812-004-POCS2.20 ppb
2013-03-181303812-002-POCS13.5 ppb
2013-03-181303812-003-POCSND
2013-04-031304193-0045.50 ppb
2013-04-031304193-003-POCS4.30 ppb
2013-04-031304193-001-POCS8.70 ppb
2013-04-151304842-001-POCS6.30 ppb
2013-04-151304842-004-POCS2.40 ppb
2013-04-151304842-002-POCS13.7 ppb
2013-04-151304842-003-POCS3.30 ppb
2013-04-241304E57-002-POCSND
2013-04-241304E57-001-POCSND
2013-05-021305099-001-POCS2.00 ppb
2013-05-061305273-0045.60 ppb
2013-05-061305273-001-POCS6.20 ppb
2013-05-081305443-001-POCS6.00 ppb
2013-05-131305622-003-POCS3.00 ppb
2013-05-131305622-004-POCS4.30 ppb
2013-05-131305622-001-POCS1.60 ppb
2013-05-131305622-002-POCS10.00 ppb
2013-05-161305904-001-POCS3.90 ppb
2013-05-171305946-001-PRI1.20 ppb
2013-05-201305A21-001-POCSND
2013-05-201305A21-002-POCSND
2013-06-031306004-001-POCS2.30 ppb
2013-06-041306081-0025.70 ppb
2013-06-041306081-0018.00 ppb
2013-06-101306423-001-POCSND
2013-06-101306423-002-POCSND
2013-06-171306859-004-POCS8.90 ppb
2013-06-171306859-003-POCS2.90 ppb
2013-06-171306859-002-POCS3.70 ppb
2013-06-171306859-001-POCS5.40 ppb
2013-07-01307024-001-POCS2.00 ppb
2013-07-011307024-002-POCS1.80 ppb
2013-07-021307124-001-POCS1.30 ppb
2013-07-081307318-0044.60 ppb
2013-07-081307318-002-POCS5.00 ppb
2013-07-081307318-001-POCS6.20 ppb
2013-07-221307A42-001-POCSND
2013-07-221307A42-002-POCSND
2013-07-241307B58-003-POCS7.50 ppb
2013-07-241307B58-002-POCS3.20 ppb
2013-07-241307B58-001-POCS3.40 ppb
2013-08-051308145-001-POCS1.80 ppb
2013-08-081308436-0045.40 ppb
2013-08-081308436-002-POCS5.50 ppb
2013-08-081308436-001-POCS7.00 ppb
2013-08-151308779-001-POCSND
2013-08-151308779-002-POCSND
2013-08-191308913-002-POCS3.50 ppb
2013-08-191308913-001-POCS4.20 ppb
2013-09-041309110-002-POCS1.80 ppb
2013-09-041309110-001-POCS1.90 ppb
2013-09-091309345-0021.60 ppb
2013-09-091309345-0041.50 ppb
2013-09-111309582-0025.40 ppb
2013-09-111309583-002-POCS4.90 ppb
2013-09-111309583-001-POCS3.40 ppb
2013-09-161309846-01-POCSND
2013-09-161309846-002-POCSND
2013-09-231309C69-003-POCS3.30 ppb
2013-09-231309C69-001-POCS9.10 ppb
2013-09-231309C69-002-POCS3.70 ppb
2013-10-021310115-002-POCSND
2013-10-021310115-001-POCS1.50 ppb
2013-10-071310350-002-POCS1.70 ppb
2013-10-071310350-001-POCS1.60 ppb
2013-10-091310544-002-POCS5.30 ppb
2013-10-091310544-003-POCS5.30 ppb
2013-10-091310544-001-POCS8.30 ppb
2013-10-161310891-001-POCSND
2013-10-161310891-002-POCSND
2013-10-211310A96-002-POCS3.60 ppb
2013-10-211310A96-003-POCS4.80 ppb
2013-10-211310A96-001-POCS8.80 ppb
2013-10-221310B85-001-POCS4.50 ppb
2013-11-041311059-002-POCS1.90 ppb
2013-11-041311059-001-POCS1.80 ppb
2013-11-061311269-0025.50 ppb
2013-11-061311268-001-POCS8.90 ppb
2013-11-061311238-001-POCSND
2013-11-061311268-002-POCS5.50 ppb
2013-11-061311238-002-POCSND
2013-11-061311238-003-POCSND
2013-11-191311934-002-POC3.70 ppb
2013-11-191311934-003-POCS5.40 ppb
2013-11-191311934-001-POCS9.70 ppb
2013-12-021312003-001-POCS2.70 ppb
2013-12-041312160-003-POCS4.70 ppb
2013-12-041312160-001-POCS9.20 ppb
2013-12-041312160-002-POCS3.70 ppb
2013-12-091312439-002-POCSND
2013-12-091312439-001-POCSND
2013-12-161312848-001-POCS6.90 ppb
2013-12-161312848-002-POCS4.80 ppb
2014-01-071401138-001-POCS2.10 ppb
2014-01-071401138-002-POCS2.20 ppb
2014-01-081401236-001-POCS7.00 ppb
2014-01-081401236-002-POCS5.80 ppb
2014-01-131401426-002-POCS3.90 ppb
2014-01-131401426-003-POCS5.40 ppb
2014-01-131401426-001-POCS10.9 ppb
2014-01-211401879-001-PRIND
2014-01-211401879-002-PRIND
2014-02-031402004-001-POCS2.20 ppb
2014-02-031402004-002-POCS2.20 ppb
2014-02-041402034-001-POCS8.50 ppb
2014-02-041402034-0045.60 ppb
2014-02-041402034-002-POCS5.40 ppb
2014-02-101402372-001-POCSND
2014-02-101402372-002-POCSND
2014-02-111402455-001-POCS1.40 ppb
2014-02-271402F41-002-POCS3.60 ppb
2014-02-271402F41-001-POCS12.0 ppb
2014-02-271402F41-003-POCS1.90 ppb
2014-03-031403014-002-POCS2.00 ppb
2014-03-031403014-001-POCS1.90 ppb
2014-03-04002-POCS5.40 ppb
2014-03-101403566-002-POCSND
2014-03-101403566-001-POCSND
2014-03-181403C16-001-POCS1.50 ppb
2014-03-191403D40-001-POCS12.0 ppb
2014-03-191403D40-003-POCS3.30 ppb
2014-03-191403D40-002-POCS4.60 ppb
2014-04-011404032-001-POCSND
2014-04-011404032-002-POCSND
2014-04-031404265-001-POCS1.90 ppb
2014-04-031404265-002-POCS2.20 ppb
2014-04-071404438-001-POCS1.40 ppb
2014-04-141404979-002-POCS4.10 ppb
2014-04-141404979-003-POCS3.70 ppb
2014-04-141404979-001-POCS12.7 ppb
2014-04-161404C04-002-POCS6.20 ppb
2014-04-161404C04-001-POCSND
2014-05-01405011-001-POCS2.40 ppb
2014-05-011405011-002-POCS2.80 ppb
2014-05-021405140-004-PRIND
2014-05-021405140-002ND
2014-05-021405140-003-PRIND
2014-05-021405140-0013.60 ppb
2014-05-051405184-003-POCS4.00 ppb
2014-05-051405184-001-POCS12.2 ppb
2014-05-051405184-002-POCS4.80 ppb
2014-05-121405773-002-POCS5.60 ppb
2014-05-121405744-001-POCSND
2014-05-121405744-002-POCSND
2014-05-121405773-001-POCS7.30 ppb
2014-06-021406009-001-POCS1.90 ppb
2014-06-021406009-002-POCS2.10 ppb
2014-06-031406123-003-POCS3.80 ppb
2014-06-031406123-002-POCS3.70 ppb
2014-06-031406123-001-POCS9.50 ppb
2014-06-041406340-004-POCSND
2014-06-041406340-002-POCSND
2014-06-041406340-001-POCS2.40 ppb
2014-06-091406553-002-POCSND
2014-06-091406553-001-POCSND
2014-06-171406B86-001-POCS11.1 ppb
2014-06-171406B86-002-POCS5.70 ppb
2014-06-241406G86-002-POCSND
2014-06-241406H58-001-POCS1.40 ppb
2014-06-241406G86-001-POCS3.10 ppb
2014-07-011407007-002-POCS2.20 ppb
2014-07-011407006-001-POCS1.50 ppb
2014-07-011407007-001-POCS2.00 ppb
2014-07-071407321-003-POCSND
2014-07-071407321-002-POCSND
2014-07-071407321-001-POCSND
2014-07-091407553-001-POCS7.00 ppb
2014-07-091407553-002-POCS5.60 ppb
2014-07-211407E-05-001-POCS10.1 ppb
2014-07-211407E05-002-POCS3.90 ppb
2014-07-211407E05-003-POCS3.70 ppb
2014-07-291407K19-001-POCS3.40 ppb
2014-07-291407K19-002-POCSND
2014-08-051408163-002-POCS2.10 ppb
2014-08-051408163-001-POCS2.10 ppb
2014-08-111408603-002-POCSND
2014-08-113-001-POCSND
2014-08-121408691-001-POCS8.50 ppb
2014-08-121408691-002-POCS6.70 ppb
2014-08-141408968-001-POCS1.80 ppb
2014-08-191408C69-001-POCS10.00 ppb
2014-08-191408C69-002-POCS3.90 ppb
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