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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Jericho 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.

MORE ABOUT THIS CONTAMINANT

 

240

Samples

0

Samples exceeding legal limit (MCL)

128

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
20141.68 ppb5829ND - 6.60 ppb
20151.50 ppb3517ND - 6.30 ppb
20161.56 ppb3821ND - 6.10 ppb
20171.85 ppb3824ND - 6.80 ppb
20181.86 ppb3821ND - 8.00 ppb
20192.00 ppb3320ND - 5.90 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
2014-03-121403811-002-POCS5.80 ppb
2014-03-171403B39-0012.50 ppb
2014-03-171403B39-0023.10 ppb
2014-04-011404097-002-PRIND
2014-04-011404097-004-PRI1.50 ppb
2014-04-011404097-013-PRI1.50 ppb
2014-04-011404097-010-PRI3.40 ppb
2014-04-011404097-006-PRIND
2014-04-011404097-011-PRIND
2014-04-011404097-007-PRI4.00 ppb
2014-04-011404115-0086.60 ppb
2014-04-011404097-012-PRI1.20 ppb
2014-04-011404097-015-PRIND
2014-04-011404097-008-PRI6.30 ppb
2014-04-011404097-009-PRIND
2014-04-071404480-003-PRI1.000 ppb
2014-04-071404488-003-PRIND
2014-04-071404480-001-PRI2.50 ppb
2014-04-071404480-002-PRI3.10 ppb
2014-04-071404488-004-PRIND
2014-04-071404488-002-PRIND
2014-04-071404488-001-PRIND
2014-04-071404476-0021.80 ppb
2014-04-141404A38-0022.90 ppb
2014-04-141404A40-002-PRIND
2014-04-171404D10-001-PRI3.20 ppb
2014-04-211404E94-0023.20 ppb
2014-04-281404K30-0024.10 ppb
2014-05-061405329-001-PRIND
2014-05-091405646-001-PRIND
2014-05-121405779-001ND
2014-05-121405780-0013.80 ppb
2014-05-121405779-003ND
2014-05-191405D56-001ND
2014-05-221405G78-001-PRIND
2014-06-021406061-0053.20 ppb
2014-06-021406061-004ND
2014-06-021406061-002ND
2014-06-021406061-003ND
2014-06-241406G97-001-PRI3.50 ppb
2014-07-021407133-001-PRIND
2014-07-021407133-002-PRIND
2014-07-031407286-001-PRIND
2014-07-031407288-002-PRIND
2014-07-071407380-001ND
2014-07-071407380-0032.60 ppb
2014-07-071407380-002ND
2014-07-071407380-005ND
2014-07-081407452-0011.70 ppb
2014-07-081407452-0034.70 ppb
2014-07-081407452-0026.40 ppb
2014-07-141407913-0021.10 ppb
2014-10-011410041-0011.30 ppb
2014-10-061410371-002ND
2014-10-211410D79-0026.50 ppb
2014-10-211410D79-0014.90 ppb
2014-11-071411507-002-PRIND
2014-11-071411507-001-PRIND
2015-03-161503A63-003-PRIND
2015-03-161503A73-001-POCS4.30 ppb
2015-03-161503A73-003-POCSND
2015-03-161503A73-002-POCS2.80 ppb
2015-03-231503F87-001-PRI3.10 ppb
2015-03-231503F87-002-PRI1.20 ppb
2015-03-301503K54-001PRI1.30 ppb
2015-04-011504075-009-PRIND
2015-04-011504075-002-PRI3.00 ppb
2015-04-011504075-007-PRI1.20 ppb
2015-04-011504075-001-PRI2.90 ppb
2015-04-011504075-010-PRIND
2015-04-011504075-004-PRIND
2015-04-011504075-008-PRIND
2015-04-011504075-006-PRIND
2015-04-011504075-011-PRIND
2015-04-06504327-001-PRI3.90 ppb
2015-04-131504883-001ND
2015-04-211504F72-001-PRIND
2015-04-271504K19-001-PRI6.30 ppb
2015-04-271504K19-002-PRI5.40 ppb
2015-04-271504K21-001-PRIND
2015-05-041505174-001ND
2015-06-011506061-001ND
2015-07-011507048-002-PRIND
2015-07-061507258-002ND
2015-07-201507D71-0034.50 ppb
2015-07-271507J00-0012.80 ppb
2015-07-281507J92-002-PRIND
2015-10-051510279-0021.30 ppb
2015-10-061510417-0024.20 ppb
2015-10-061510417-0011.40 ppb
2015-10-071510545-0012.90 ppb
2015-10-231510I59-001-PRIND
2015-10-231510I59-002-PRIND
2016-01-111601589-002-PRIND
2016-01-111601589-003-PRI5.10 ppb
2016-01-191601C13-002-PRIND
2016-01-191601C13-003-PRIND
2016-01-191601C13-004-PRI1.60 ppb
2016-01-191601C13-001-PRIND
2016-01-191601C13-005-PRIND
2016-02-021602145-001-PRIND
2016-04-011604082-0035.60 ppb
2016-04-041604270-001-PRI1.90 ppb
2016-04-041604270-002-PRI2.20 ppb
2016-04-061604515-001-PRIND
2016-04-061604522-002-PRIND
2016-04-061604522-001-PRIND
2016-04-061604515-002-PRIND
2016-04-201604J06-002-PRIND
2016-04-201604J06-004-PRI2.70 ppb
2016-04-201604J28-0011.40 ppb
2016-05-061605621-001-PRIND
2016-05-091605733-001-PRI1.80 ppb
2016-05-091605733-004-PRIND
2016-05-091605729-001-PRIND
2016-06-021606201-001-PRI3.50 ppb
2016-06-071606596-0021.90 ppb
2016-06-081606753-0022.00 ppb
2016-07-051607222-0021.90 ppb
2016-07-051607222-032.50 ppb
2016-07-061607317-002-PRIND
2016-07-111607780-002ND
2016-07-181607E35-0013.90 ppb
2016-07-181607E35-0031.10 ppb
2016-07-181607E35-0026.10 ppb
2016-10-03701061017-POCSND
2016-10-03701061018-POCS2.40 ppb
2016-10-03701061021-POCS1.70 ppb
2016-10-03701061019-POCS5.30 ppb
2016-10-117016880221.000 ppb
2016-10-117016880233.70 ppb
2017-01-097086360013.30 ppb
2017-04-0370147520044.00 ppb
2017-04-037014752001-PRIND
2017-04-037014752003-PRI2.80 ppb
2017-04-041604270-004-PRIND
2017-04-137015837003-PRI2.90 ppb
2017-04-137015837002-PRIND
2017-04-137015837001-PRIND
2017-04-137015837004-PRIND
2017-04-177016053011ND
2017-04-1770160530105.20 ppb
2017-04-177016053010-PRI5.21 ppb
2017-05-017017381002-PRIND
2017-05-097018178001ND
2017-06-1270210750181.30 ppb
2017-06-2670223980021.10 ppb
2017-07-037023097007ND
2017-07-1070236200046.00 ppb
2017-07-1070236200031.30 ppb
2017-07-1770243420036.80 ppb
2017-07-1770243420022.80 ppb
2017-07-1770243420011.60 ppb
2017-07-207024847002-PRIND
2017-07-2470250810021.000 ppb
2017-08-0770263710021.40 ppb
2017-08-147027129002ND
2017-08-2170278000021.80 ppb
2017-09-0570288900021.40 ppb
2017-09-117029470003ND
2017-09-1870302140021.80 ppb
2017-10-0270316320041.40 ppb
2017-10-0270316320012.50 ppb
2017-10-0270316320025.60 ppb
2017-10-107032387004ND
2017-10-1070323870015.80 ppb
2017-10-107032387002ND
2017-10-1670330300131.40 ppb
2017-10-3070343130022.00 ppb
2018-01-0270394520025.50 ppb
2018-01-0270394520014.40 ppb
2018-04-027046893004-PRIND
2018-04-027046891002-PRI2.20 ppb
2018-04-027046891003-PRI1.70 ppb
2018-04-027046891001-PRI3.10 ppb
2018-04-027046893003-PRIND
2018-04-037047054001-PRIND
2018-04-037047054002-PRIND
2018-04-037047062001-PRIND
2018-04-037047054003-PRIND
2018-04-037047062002-PRI2.60 ppb
2018-04-047047155001-PRI1.60 ppb
2018-04-047047154001-PRI5.10 ppb
2018-04-047047155002-PRI2.10 ppb
2018-04-04704154002-PRI7.30 ppb
2018-05-077050746001-PRI1.50 ppb
2018-05-297053027001-SECND
2018-06-117054482001-PRIND
2018-06-187055286002ND
2018-06-187055286003ND
2018-06-187055288001-PRIND
2018-06-1870552880031.90 ppb
2018-07-0270568680022.20 ppb
2018-07-027056863001ND
2018-07-0270568630031.80 ppb
2018-07-0970574680018.00 ppb
2018-07-097057468002ND
2018-07-1670583180025.60 ppb
2018-07-1670583180011.10 ppb
2018-08-137061324001ND
2018-08-277062874002ND
2018-08-2770628720011.30 ppb
2018-10-0170663840032.30 ppb
2018-10-0170663840025.50 ppb
2018-10-017066384001ND
2018-10-0170663840043.90 ppb
2018-11-057069984002ND
2019-01-147076478001ND
2019-01-1470764780025.60 ppb
2019-04-017084007001-PRI2.80 ppb
2019-04-017084008003ND
2019-04-0170840080014.30 ppb
2019-04-0170840080024.90 ppb
2019-04-0470845990014.20 ppb
2019-04-047084599002-PRIND
2019-04-097085085001-SEC1.80 ppb
2019-05-067088223001-SECND
2019-05-137089238002ND
2019-05-237090617001-SECND
2019-05-247090863001-SECND
2019-06-077092771001-SEC2.10 ppb
2019-06-077092771002-SEC1.40 ppb
2019-06-077092771003-SECND
2019-06-107092854001-PRI4.30 ppb
2019-06-107092854002-PRI4.40 ppb
2019-06-247094945001-SECND
2019-06-2470950630033.40 ppb
2019-06-2470950630021.000 ppb
2019-07-0870966080014.50 ppb
2019-07-177097822001-PRIND
2019-08-1270100882001ND
2019-08-1270100882003ND
2019-08-19701018910075.00 ppb
2019-08-19701018910061.80 ppb
2019-10-28701098750061.40 ppb
2019-10-28701098750025.90 ppb
2019-10-28701098750042.30 ppb
2019-11-04701105540011.70 ppb
2019-11-0770111116001ND
2019-11-07701111160023.10 ppb