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EWG's Tap Water Database — 2021 UPDATE

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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.

MORE ABOUT THIS CONTAMINANT

 

792

Samples

0

Samples exceeding legal limit (MCL)

553

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20143.44 ppb139102ND - 13.8 ppb
20153.26 ppb12494ND - 13.2 ppb
20163.00 ppb145111ND - 10.00 ppb
20172.54 ppb157104ND - 12.7 ppb
20182.68 ppb11069ND - 12.1 ppb
20192.46 ppb11776ND - 11.0 ppb

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
2014-01-071401138-001-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-POC10.1 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
2014-08-191408C69-003-POCS3.60 ppb
2014-08-251408H13-001-POCS3.30 ppb
2014-08-251408H13-002-POCSND
2014-08-311508N08-002-POCS4.20 ppb
2014-08-311508N08-001-POCS4.20 ppb
2014-09-021409006-001-POCS1.80 ppb
2014-09-021409006-002-POCS1.90 ppb
2014-09-031409147-001-POCSND
2014-09-031409147-002-POCSND
2014-09-081409465-001-POCS9.10 ppb
2014-09-081409465-003-POCS4.60 ppb
2014-09-081409465-002-POCS3.40 ppb
2014-09-091409574-001-POCS9.70 ppb
2014-09-291409L55-001-POCS3.10 ppb
2014-09-291409L82-001-POCS1.40 ppb
2014-09-291409L55-002-POCSND
2014-10-061410303-002-POCS3.30 ppb
2014-10-061410303-001-POCS8.80 ppb
2014-10-061410303-003-POCS5.30 ppb
2014-10-071410401-002-POCSND
2014-10-071410401-001-POCS3.80 ppb
2014-10-08410540-001-POCS1.90 ppb
2014-10-081410540-002-POCS2.00 ppb
2014-10-141410867-001-POCS13.0 ppb
2014-10-141410867-002-POCS6.40 ppb
2014-10-211410D18-002-POCSND
2014-10-281410H85-001-POCS1.60 ppb
2014-11-031511114-0012.20 ppb
2014-11-031411029-001-POCS2.10 ppb
2014-11-0314110290002-POCS2.00 ppb
2014-11-031511114-002-POCS2.30 ppb
2014-11-041411162-001-POCS12.1 ppb
2014-11-041411160-001-POCSND
2014-11-041411162-003-POCS4.00 ppb
2014-11-041411162-002-POCS3.50 ppb
2014-11-041411160-002-POCSND
2014-11-121411708-001-POCS7.40 ppb
2014-11-121411708-002-POCS6.70 ppb
2014-11-241411F90-001-POCS2.10 ppb
2014-12-011412055-002-POCSND
2014-12-011412004-002-POCS2.10 ppb
2014-12-011412004-001-POCS2.10 ppb
2014-12-011412055-003-POCSND
2014-12-011412055-001-POCSND
2014-12-081412528-002-POCS1.80 ppb
2014-12-081412528-003-POCSND
2014-12-081412528-001-POCS13.8 ppb
2014-12-151412A53-002-POCS5.30 ppb
2014-12-151412A53-001-POCS5.90 ppb
2014-12-301412J15-001-POCS1.60 ppb
2015-01-051501098-001-POCS6.70 ppb
2015-01-051501057-001-POCS1.60 ppb
2015-01-051501057-002-POCS1.90 ppb
2015-01-051501098-002-POCS5.60 ppb
2015-01-131501685-002-PRI1.60 ppb
2015-01-131501685-001-PRI1.40 ppb
2015-01-141501749-001-PRIND
2015-01-231501E09-001-PRI13.2 ppb
2015-01-231501E09-002-PRI4.80 ppb
2015-01-231501E09-003-PRI3.80 ppb
2015-02-021502020-001-POCS3.10 ppb
2015-02-021502020-002-POCS2.20 ppb
2015-02-031502056-003-POCSND
2015-02-031502056-001-POCSND
2015-02-031502056-002-POCSND
2015-02-101502545-001-POCS7.20 ppb
2015-02-101502545-002-POCS5.80 ppb
2015-02-181502A50-001-POCSND
2015-03-031503079-001-POCSND
2015-03-031503079-002-POCSND
2015-03-031503079-003-POCSND
2015-03-041503215-001-POCS2.20 ppb
2015-03-041503215-002-POCS2.40 ppb
2015-03-101503567-001-POCSND
2015-03-111503703-002-POCS3.90 ppb
2015-03-111503703-001-POCS4.10 ppb
2015-04-011504025-002-POCS2.70 ppb
2015-04-011504025-001-POCS3.00 ppb
2015-04-061504293-001-POCS1.20 ppb
2015-04-061504303-002-POCS7.20 ppb
2015-04-061504303-001-POCS3.50 ppb
2015-04-211504F27-001-POCSND
2015-04-211504F27-002-POCSND
2015-05-041505116-002-POCS2.40 ppb
2015-05-041505165-002-POCS6.50 ppb
2015-05-041505116-001-POCS2.30 ppb
2015-05-041505165-001-POCS6.00 ppb
2015-05-081505605-002-PRI3.10 ppb
2015-05-081505605-004-PRIND
2015-05-111505698-003-POCSND
2015-05-111505698-002-POCSND
2015-05-111505698-001-POCSND
2015-05-141505A15-001-POCS1.60 ppb
2015-06-041506369-001-PRI8.70 ppb
2015-06-041506369-003-PRI9.50 ppb
2015-06-091506752-001-POCS2.60 ppb
2015-06-091506752-002-POCS2.80 ppb
2015-06-101506840-002-POCSND
2015-06-101506840-003-POCSND
2015-06-101506840-001-POCSND
2015-06-251506K63-001-POCS3.40 ppb
2015-06-251506K63-002-POCS3.20 ppb
2015-07-071507339-003-POCS2.00 ppb
2015-07-071507339-002-POCS1.90 ppb
2015-07-071507339-001-POCS1.40 ppb
2015-07-091507598-005-POCS5.80 ppb
2015-07-091507598-002-POCS5.60 ppb
2015-07-091507598-001-POCS8.10 ppb
2015-07-171507C71-002-POCS4.80 ppb
2015-07-171507C71-001-POCS3.50 ppb
2015-07-221507F82-002-POCSND
2015-07-221507F82-001-POCSND
2015-07-221507F88-001-POCSND
2015-07-281507J65-0025.00 ppb
2015-07-28150760-003-POCS3.30 ppb
2015-07-281507J60-001-POCS9.40 ppb
2015-07-281507J60-002-POCS3.40 ppb
2015-08-041508128-001-POCS1.80 ppb
2015-08-041508128-002-POCS1.70 ppb
2015-08-051508306-001-POCSND
2015-08-051508306-002-POCSND
2015-08-121508902-0046.00 ppb
2015-08-121508902-001-POCS6.00 ppb
2015-08-121508668-001-POCS1.20 ppb
2015-08-121508902-002-POCS4.80 ppb
2015-08-121508306-003-POCSND
2015-08-191508E92-0023.80 ppb
2015-08-191508E91-003-POCS3.00 ppb
2015-08-191508E91-001-POCS8.90 ppb
2015-08-191508E91-002-POCS2.90 ppb
2015-09-021509122-002-POCS2.60 ppb
2015-09-021509122-003-POCS2.70 ppb
2015-09-021509122-001-POCS2.00 ppb
2015-09-091509634-001-POCS9.30 ppb
2015-09-091509634-002-POCS6.30 ppb
2015-09-161509B60-001-POCSND
2015-09-161509B60-002-POCSND
2015-09-161509B60-003-POCSND
2015-09-221509G40-003-POCS4.30 ppb
2015-09-221509G40-001-POCS8.50 ppb
2015-09-221509G40-002-POCS3.50 ppb
2015-09-221509G40-0075.10 ppb
2015-09-291509L97-002-POCS3.80 ppb
2015-09-291509L97-001-POCS3.60 ppb
2015-10-051510202-001-POCS1.70 ppb
2015-10-061510378-002-POCS2.00 ppb
2015-10-061510378-001-POCS2.00 ppb
2015-10-131510890-004-GEND
2015-10-131510890-001-POCSND
2015-10-131510890-002-POCSND
2015-10-141510A29-002-POCS5.20 ppb
2015-10-141510A29-005-GE5.90 ppb
2015-10-20151E70-002-POCS9.30 ppb
2015-10-201510E70-003-POCS2.40 ppb
2015-10-20151E70-004-POCS3.00 ppb
2015-10-201510E70-008-GE4.60 ppb
2015-10-201510E70-001-POCS4.90 ppb
2015-10-271510K13-001-POCS3.40 ppb
2015-10-271510K13-002-POCS3.20 ppb
2015-11-041511267-0025.40 ppb
2015-11-0415611265-0015.90 ppb
2015-11-041511265-002-POCS5.40 ppb
2015-11-161511B78-001-POCS3.00 ppb
2015-11-171511C64-004-POCS2.30 ppb
2015-11-171511C64-001-POCS4.80 ppb
2015-11-171511C64-0084.60 ppb
2015-11-171511C64-003-POCS2.90 ppb
2015-11-171511C64-002-POCS9.60 ppb
2015-12-011512014-002-POCS2.10 ppb
2015-12-081512605-001-POCS2.50 ppb
2015-12-15151D35-002-POCS10.4 ppb
2015-12-161512D35-004-POCS3.00 ppb
2015-12-16151D35-001-POCS4.70 ppb
2015-12-161512D35-003-POCS3.30 ppb
2016-01-051601130-002-POCS2.20 ppb
2016-01-051601130001-POCS2.00 ppb
2016-01-071601345-002-POCS5.20 ppb
2016-01-071601345-001-POCSND
2016-01-121601648-001-POCS2.00 ppb
2016-01-141601962-003-PRIND
2016-01-141601962-004-PRIND
2016-01-15160A32-001-SECND
2016-01-151601A32-002-PRIND
2016-01-17709276002-PRIND
2016-01-191601B52-001-PRIND
2016-01-201601D06-004-POCS1.40 ppb
2016-01-201601D06-001-POCS4.60 ppb
2016-01-201601D06-003-POCS1.30 ppb
2016-01-201601D06-002-POCS10.00 ppb
2016-01-261601G57-002-POCSND
2016-01-261601G57-001-POCSND
2016-02-011602009-002-POCS2.10 ppb
2016-02-021602124-001-POCS4.60 ppb
2016-02-021602124-004-POCS1.30 ppb
2016-02-021602124-002-POCS9.70 ppb
2016-02-021602124-003-POCS2.10 ppb
2016-02-031602009-001-POCS1.90 ppb
2016-02-031602262-001-POCS1.10 ppb
2016-02-091602755-002-POCS5.30 ppb
2016-02-091602755-001-POCS8.60 ppb
2016-02-171602C36-002-POCSND
2016-02-171602C36-001-POCSND
2016-03-011603001-002-POCS4.90 ppb
2016-03-011603001-001-POCSND
2016-03-021603127-001-POCS2.00 ppb
2016-03-021603127-002-POCS2.30 ppb
2016-03-081603588-001-POCS2.90 ppb
2016-03-091603705-002-POCS9.40 ppb
2016-03-091603705-004-POCS1.30 ppb
2016-03-091603705-003-POCS1.90 ppb
2016-03-091603705-001-POCS4.90 ppb
2016-03-161603C59-001-POCSND
2016-03-161603C59-002-POCSND
2016-03-171603E010001-PRIND
2016-04-051604317-002-POCS2.20 ppb
2016-04-051604317-001-POCS2.90 ppb
2016-04-061604474-002-POCSND
2016-04-061604474-001-POCS1.40 ppb
2016-04-071604644-001-POCS6.80 ppb
2016-04-071604644-002-POCS4.70 ppb
2016-04-191604H22-001-POCS4.60 ppb
2016-04-191604H22-002-POCS9.50 ppb
2016-04-191604H22-004-POCS2.20 ppb
2016-04-191604H22-003-POCS1.60 ppb
2016-04-271604O64-001-POCS3.70 ppb
2016-05-031605131-001-POCS2.00 ppb
2016-05-031605131-002-POCS2.10 ppb
2016-05-041605276-002-POCS3.40 ppb
2016-05-0405/04/20167.00 ppb
2016-05-051605408-001-POCS2.60 ppb
2016-05-171605E44-002-POCS9.40 ppb
2016-05-171605E44-004-POCS1.70 ppb
2016-05-171605E44-003-POCS1.90 ppb
2016-05-171605E44-001-POCS5.60 ppb
2016-05-251605N49-001-POCSND
2016-05-251605N49-002-POCS1.60 ppb
2016-05-261605P45-001-POCS4.50 ppb
2016-05-261605P45=002-POCS4.50 ppb
2016-06-011606137-003-POCS4.60 ppb
2016-06-021606189-002-POCS4.40 ppb
2016-06-061606440-002-POCS2.00 ppb
2016-06-061606440-001-POCS1.90 ppb
2016-06-071606537-002-POCSND
2016-06-141606D23-002-POCS9.50 ppb
2016-06-141606D23-003-POCS5.20 ppb
2016-06-141606D230001-POCS1.20 ppb
2016-06-211616J98-001-POCS5.40 ppb
2016-06-211606J98-002-POCS8.80 ppb
2016-07-051607138-001-POCS1.30 ppb
2016-07-071607457-002-POCS2.10 ppb
2016-07-071607457-001-POCS2.20 ppb
2016-07-111607722-002-POCS6.10 ppb
2016-07-111607722-001-POCS9.40 ppb
2016-07-191607E66-001-POCSND
2016-07-191607E66-002-POCSND
2016-07-201607G25-002-POCSND
2016-07-201607G25-001-POCS1.000 ppb
2016-07-251607K42-004-POCS3.60 ppb
2016-07-251607K42-001-POCS5.90 ppb
2016-07-251607K42-003-POCS2.00 ppb
2016-07-251607K42-002-POCS9.20 ppb
2016-07-271607N14-002-POCS3.50 ppb
2016-07-271607N14-001-POCS3.40 ppb
2016-08-021608140-001-POCS1.30 ppb
2016-08-021608140-003-POCSND
2016-08-021608140-002-POCS1.80 ppb
2016-08-081608762-001-POCS5.60 ppb
2016-08-081608762-002-POCS4.80 ppb
2016-08-151608D68-002-POCSND
2016-08-151608D68-001-POCS1.000 ppb
2016-08-161608E55-003-POCS1.60 ppb
2016-08-161608E55-002-POCS8.00 ppb
2016-08-161608E55-004-POCS3.00 ppb
2016-08-161608E55-001-POCS5.10 ppb
2016-08-291608Q17-002-POCSND
2016-08-291608Q17-001-POCSND
2016-08-301608Q97-002-POCS3.50 ppb
2016-08-301608Q97-001-POCS3.20 ppb
2016-09-071609388-002-POCS2.00 ppb
2016-09-071609388-001-POCS1.90 ppb
2016-09-121609773-001-POCS3.50 ppb
2016-09-121609773-002-POCS3.50 ppb
2016-09-131609878-001-POCS6.30 ppb
2016-09-131609878-002-POCS5.20 ppb
2016-09-141609A97-002-POCSND
2016-09-151609C61-001-POCS1.30 ppb
2016-09-261609L89-004-POCS1.40 ppb
2016-09-261609L89-003-POCSND
2016-09-261609L89-002-POCS8.00 ppb
2016-09-261609L89-001-POCS5.80 ppb
2016-09-281609O64-001-POCS1.20 ppb
2016-09-281609O64-002-POCSND
2016-10-05701192002-POCS1.70 ppb
2016-10-05701192001-POCS1.80 ppb
2016-10-17702188001ND
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