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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Bethpage WD

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.

 

896

Samples

0

Samples exceeding legal limit (MCL)

513

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.54 ppb142108ND - 8.10 ppb
20152.44 ppb15596ND - 9.40 ppb
20162.51 ppb15895ND - 7.50 ppb
20172.45 ppb16097ND - 8.10 ppb
20182.40 ppb14283ND - 6.70 ppb
20192.15 ppb13969ND - 6.90 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
2014-01-061401064-001-POCS6.60 ppb
2014-01-061401064-003-POCS2.40 ppb
2014-01-061401064-002-POCS5.30 ppb
2014-01-071401169-002-POCS2.90 ppb
2014-01-071401169-001-POCS3.50 ppb
2014-01-071401169-003-POCS3.60 ppb
2014-01-101401379-002-POCSND
2014-01-101401379-001-POCS7.20 ppb
2014-01-101401382-001-POCS1.20 ppb
2014-02-041402054-002-POCS5.30 ppb
2014-02-041402054-001-POCS5.90 ppb
2014-02-041402054-003-POCSND
2014-02-061402226-001-POCSND
2014-02-061402226-003-POCSND
2014-02-06140226-002-POCSND
2014-02-101402403-001-POCS3.90 ppb
2014-02-101402406-003-POCS3.90 ppb
2014-02-101402403-002-POCS2.70 ppb
2014-02-181402811-001-POCSND
2014-02-181402809-001-POCS6.70 ppb
2014-02-181402805-001-POCS1.20 ppb
2014-03-031403028-002-POCS4.80 ppb
2014-03-031403028-003-POCSND
2014-03-031403028-001-POCS5.10 ppb
2014-03-071403446-003-POCS0.800 ppb
2014-03-071403446-002-POCS0.600 ppb
2014-03-071403446-001-POCSND
2014-03-131403873-001-POCS3.70 ppb
2014-03-131403873-002-POCS2.60 ppb
2014-03-131403873-003-POCS4.20 ppb
2014-03-171403B04-001-POCSND
2014-03-171403B04-002-POCS7.90 ppb
2014-03-171403B04-003-POCSND
2014-04-011404009-001-POCS5.80 ppb
2014-04-011404009-002-POCS5.00 ppb
2014-04-011404009-003-POCS1.10 ppb
2014-04-031404242-003-POCSND
2014-04-031404242-001-POCS1.000 ppb
2014-04-031404242-002-POCS8.10 ppb
2014-04-091404699-003-POCS0.600 ppb
2014-04-091404699-002-POCS0.500 ppb
2014-04-091404699-001-POCSND
2014-04-141404A25-003-POCS3.30 ppb
2014-04-141404A25-002-POCS2.60 ppb
2014-04-141404A25-001-POCS4.00 ppb
2014-05-011405009-003-POCS1.20 ppb
2014-05-011405009-002-POCS6.00 ppb
2014-05-011405009-001-POCS6.30 ppb
2014-05-051405196-003-POCS0.800 ppb
2014-05-051405196-001-POCSND
2014-05-051405196-002-POCS0.700 ppb
2014-05-081405554-001-POCS4.10 ppb
2014-05-081405554--003-POC3.10 ppb
2014-05-131405966-001-POCS7.30 ppb
2014-05-131405965-001-POCS0.800 ppb
2014-05-131405966-002-POCSND
2014-06-021406028-003-POCS0.800 ppb
2014-06-021406028-001-POCSND
2014-06-021406028-002-POCS0.500 ppb
2014-06-031046154-002-POCS2.30 ppb
2014-06-031406154-002-POCS2.30 ppb
2014-06-031406154-003-POCS3.10 ppb
2014-06-031406154-001-POCS3.80 ppb
2014-06-041406248-001-POCS5.00 ppb
2014-06-041406248-003-POCS1.60 ppb
2014-06-041406248-002-POCS5.60 ppb
2014-06-091406560-001-POCSND
2014-06-091406556-001-POCS1.000 ppb
2014-06-091406560-002-POCSND
2014-07-011407005-002-POCS0.800 ppb
2014-07-011407012-003-POCS1.80 ppb
2014-07-011407012-001-POCS5.30 ppb
2014-07-011407005-003-POCS0.800 ppb
2014-07-011407012-002-POCS5.40 ppb
2014-07-01147005-001-POCSND
2014-07-031407230-001-POCS7.10 ppb
2014-07-031407230-002-POCSND
2014-07-031407219-001-POCS0.500 ppb
2014-07-031407226-003-POCS3.40 ppb
2014-07-031407226-002-POCS2.50 ppb
2014-07-031407226-001-POCS3.70 ppb
2014-08-051408207-001-POCS5.70 ppb
2014-08-051408207-003-POCS1.70 ppb
2014-08-051408207-002-POCS5.10 ppb
2014-08-061408299-003-POCS0.600 ppb
2014-08-061408299-001-POCSND
2014-08-061408299-002-POCSND
2014-08-071408410-003-POCS3.30 ppb
2014-08-071408410-002-POCS2.40 ppb
2014-08-071408410-001-POCS3.80 ppb
2014-08-111408684-002-POCSND
2014-08-111408682-001-POCS0.700 ppb
2014-08-111408684-001-POCS6.70 ppb
2014-09-021409035-002-POCS5.10 ppb
2014-09-021409035-001-POCS5.50 ppb
2014-09-021409035-003-POCS1.80 ppb
2014-09-031409183-001-POCSND
2014-09-031409183-002-POCSND
2014-09-031409183-003-POCSND
2014-09-041409243-003-POCS3.20 ppb
2014-09-041409243-002-POCS2.20 ppb
2014-09-041409243-001-POCS3.50 ppb
2014-09-051409357-001-POCS7.00 ppb
2014-09-051409357-002-POCSND
2014-09-051409360-002-POCS0.700 ppb
2014-09-051409360-001-POCS0.700 ppb
2014-10-011410069-001-POCSND
2014-10-011410067-001-POCS5.50 ppb
2014-10-011410067-003-POCS1.60 ppb
2014-10-011410067-002-POCS5.00 ppb
2014-10-011410069-002-POCS0.500 ppb
2014-10-011410069-003-POCS0.600 ppb
2014-10-061410308-003-POCS3.10 ppb
2014-10-061410308-002-POCS2.30 ppb
2014-10-061410308-001-POCS3.50 ppb
2014-10-081410587-001-POCS0.700 ppb
2014-10-081410584-002-POCSND
2014-10-081410584-001-POCS6.60 ppb
2014-11-031411023-001-POCSND
2014-11-031411032-002-POCS4.60 ppb
2014-11-031411023-003-POCSND
2014-11-031411032-003-POCS1.30 ppb
2014-11-031411032-001-POCS5.80 ppb
2014-11-031411023-002-POCSND
2014-11-041411165-002-POCS2.70 ppb
2014-11-041411165-003-POCS3.00 ppb
2014-11-041411165-001-POCS3.90 ppb
2014-11-051411230-001-POCS0.800 ppb
2014-11-131411907-002-POCSND
2014-11-131411907-001-POCS6.80 ppb
2014-12-011412018-002-POCS5.20 ppb
2014-12-011412018-001-POCS6.10 ppb
2014-12-011412016-003-POCS0.600 ppb
2014-12-011412018-003-POCS1.40 ppb
2014-12-011412016-002-POCS0.500 ppb
2014-12-011412016-001-POCSND
2014-12-021412144-003-POCS3.20 ppb
2014-12-021412144-002-POCS2.70 ppb
2014-12-021412144-001-POCS3.60 ppb
2014-12-031412223-001-POCS0.800 ppb
2014-12-031412225-001-POCS7.00 ppb
2014-12-031412225-002-POCSND
2015-01-021501009-002-POCS2.40 ppb
2015-01-021501004-02-POCSND
2015-01-021501009-003-POCS3.10 ppb
2015-01-021501004-003-POCS0.600 ppb
2015-01-021501009-001-POCS3.50 ppb
2015-01-051501004-001-POCSND
2015-01-121501572-002-POCSND
2015-01-121501570-002-POCSND
2015-01-121501570-001-POCSND
2015-01-121501572-001-POCS6.70 ppb
2015-01-261501F10-001-POCS5.50 ppb
2015-01-261501F10-002-POCS4.80 ppb
2015-01-261501F10-003-POCSND
2015-02-021502016-001-POCSND
2015-02-021502041-001-POCS5.40 ppb
2015-02-021502016-002-POCSND
2015-02-021502041-002-POCS4.60 ppb
2015-02-021502016-003-POCSND
2015-02-021502041-003-POCSND
2015-02-091502455-001-POCS1.000 ppb
2015-02-091502453-001-POCS6.80 ppb
2015-02-091502453-002-POCSND
2015-02-101502576-002-POCS2.70 ppb
2015-02-101502576-001-POCS3.90 ppb
2015-02-101502576-003-POCS3.60 ppb
2015-03-021503016-003-POCSND
2015-03-021503016-002-POCSND
2015-03-021503018-001-POCS6.90 ppb
2015-03-021503018-002-POCS5.50 ppb
2015-03-021503018-003-POCSND
2015-03-021503016-001-POCSND
2015-03-041503223-002-POCS1.20 ppb
2015-03-041503223-001-POCS1.000 ppb
2015-03-041503217-002-POCSND
2015-03-041503217-001-POCS7.80 ppb
2015-03-091503514-003-POCS3.50 ppb
2015-03-091503514-001-POCS4.10 ppb
2015-03-091503514-002-POCS2.80 ppb
2015-03-231503F54-001 PRIND
2015-04-021504182-003-POCS1.20 ppb
2015-04-021504182-001-POCSND
2015-04-021504182-002-POCSND
2015-04-061504322-002-POCS5.80 ppb
2015-04-061504322-003-POCSND
2015-04-061504322-001-POCS8.00 ppb
2015-04-081504519-002-POCSND
2015-04-081504516-001-POCS1.30 ppb
2015-04-081504519-001-POCS7.40 ppb
2015-04-091504631-001ND
2015-04-161504B93-002-POCS3.50 ppb
2015-04-161504B93-001-POCS4.00 ppb
2015-04-161504B93-003-POCS9.40 ppb
2015-05-041505127-001-POCSND
2015-05-041505126-001-POCS1.20 ppb
2015-05-041505127-03-POCSND
2015-05-041505127-002-POCSND
2015-05-051505273-002-POCS2.40 ppb
2015-05-051505273-003-POCS4.00 ppb
2015-05-051505226-001-POCS5.10 ppb
2015-05-051505226-003-POCSND
2015-05-051505226-002-POCS4.90 ppb
2015-05-051505273-001-POCS3.80 ppb
2015-05-111505703-001-POCSND
2015-05-111505701-0016.10 ppb
2015-05-111505701-002ND
2015-06-011506001-001-POCS3.70 ppb
2015-06-011506021-002-POCSND
2015-06-011506021-003-POCSND
2015-06-011506001-003-POCSND
2015-06-011506021-001-POCSND
2015-06-031506228-002ND
2015-06-051506511-0033.60 ppb
2015-07-011507028-004 POCS4.90 ppb
2015-07-011507028-0035.20 ppb
2015-07-011507028-0022.10 ppb
2015-07-011507028-001ND
2015-07-021507155-002 POCS4.20 ppb
2015-07-021507122-002ND
2015-07-021507131-003ND
2015-07-021507126-002 POCSND
2015-07-021507131-001 POCSND
2015-07-021507152-0012.90 ppb
2015-07-021507131-002 POCSND
2015-07-021507155-001 POCS2.60 ppb
2015-07-021507126-001 POCS7.30 ppb
2015-07-021507122-001 POCS1.000 ppb
2015-08-031508112-0024.90 ppb
2015-08-031508021-001 POCS3.40 ppb
2015-08-031508112-003 POCSND
2015-08-031508016-001 POCS6.80 ppb
2015-08-031508016-002 POCSND
2015-08-031508112-001 POCS5.30 ppb
2015-08-041508136-002 BACND
2015-08-041508132-001 POCS3.10 ppb
2015-08-041508132-0032.80 ppb
2015-08-0415089132-002 POC2.40 ppb
2015-08-041508136-003 POCSND
2015-08-041508136-001 POCSND
2015-08-051508292-001 POCSND
2015-09-011509069-002 POCS1.30 ppb
2015-09-011509069-0031.20 ppb
2015-09-011509048-001 POCS4.40 ppb
2015-09-011509069-001 POCSND
2015-09-011509044-0031.70 ppb
2015-09-011509044-001 POCS6.00 ppb
2015-09-011509044-002 POCS5.80 ppb
2015-09-021509127-001 POCS1.50 ppb
2015-09-021509130-003 POCS3.70 ppb
2015-09-021509130-002 POCS3.00 ppb
2015-09-021509130-001 POCS4.20 ppb
2015-09-241509I95-002ND
2015-09-241509I95-0016.40 ppb
2015-10-011510012-003ND
2015-10-011510012-002ND
2015-10-011510012-001ND
2015-10-021510102-0031.80 ppb
2015-10-021510102-0023.50 ppb
2015-10-021510102-0015.00 ppb
2015-10-021510135-0014.00 ppb
2015-10-051510204-0022.50 ppb
2015-10-051510204-0032.80 ppb
2015-10-051510275-0011.30 ppb
2015-10-051510275-0021.40 ppb
2015-10-051510204-0013.50 ppb
2015-10-091510761-002ND
2015-10-091510775-0045.10 ppb
2015-10-091510775-0035.80 ppb
2015-10-091510775-0064.10 ppb
2015-10-091510775-0051.90 ppb
2015-10-091510761-0016.20 ppb
2015-10-211510G47-001ND
2015-11-021511011-002ND
2015-11-021511015-0032.80 ppb
2015-11-021511015-0024.80 ppb
2015-11-021511019-0034.10 ppb
2015-11-021511011-003ND
2015-11-021511019-0013.60 ppb
2015-11-021511019-0022.80 ppb
2015-11-021511015-0015.20 ppb
2015-11-021511011-001ND
2015-11-041511236-0014.20 ppb
2015-11-041511232-0015.90 ppb
2015-11-041511232-002ND
2015-11-041511238-001ND
2015-11-041511239-0011.20 ppb
2015-12-011512122-0033.00 ppb
2015-12-011512117-0015.80 ppb
2015-12-011512117-002ND
2015-12-011512122-0024.60 ppb
2015-12-011512119-001ND
2015-12-011512122-0014.70 ppb
2015-12-011512124-0016.70 ppb
2015-12-031512274-0022.40 ppb
2015-12-031512274-0013.50 ppb
2015-12-031512274-0033.20 ppb
2016-01-041601027-0025.00 ppb
2016-01-041601027-0033.90 ppb
2016-01-041601026-001ND
2016-01-041601026-003ND
2016-01-041601028-0014.30 ppb
2016-01-041601026-002ND
2016-01-041601027-0015.20 ppb
2016-01-051601117-0033.10 ppb
2016-01-051601118-0011.000 ppb
2016-01-051601121-0015.90 ppb
2016-01-051601117-0013.50 ppb
2016-01-0516011174-0022.40 ppb
2016-02-011602030-001ND
2016-02-011602026-0033.20 ppb
2016-02-011602030-003ND
2016-02-011602028-0014.10 ppb
2016-02-011602026-0015.10 ppb
2016-02-011602030-002ND
2016-02-011602026-0024.90 ppb
2016-02-021602114-0013.60 ppb
2016-02-021602116-0011.20 ppb
2016-02-021602114-0022.60 ppb
2016-02-021602118-0015.90 ppb
2016-02-021602114-0033.50 ppb
2016-03-011603017-0033.60 ppb
2016-03-011603058-003ND
2016-03-011603058-002ND
2016-03-011603058-001ND
2016-03-011603017-0024.80 ppb
2016-03-011603017-0015.60 ppb
2016-03-011603030-0014.30 ppb
2016-03-021603131-0015.90 ppb
2016-03-021603136-0022.30 ppb
2016-03-021603136-0013.30 ppb
2016-03-021603136-0032.60 ppb
2016-03-021603133-0011.10 ppb
2016-04-041604178-002ND
2016-04-041604182-0033.80 ppb
2016-04-041604178-001ND
2016-04-041604182-0015.40 ppb
2016-04-041604178-003ND
2016-04-041604176-0014.10 ppb
2016-04-041604182-0024.60 ppb
2016-04-051604309-0015.60 ppb
2016-04-051604307-0011.10 ppb
2016-04-191604H86-001ND
2016-04-191604H79-001ND
2016-04-191604H79-002ND
2016-04-191604H82-001 PRI6.00 ppb
2016-05-021605031-001ND
2016-05-021605025-0014.60 ppb
2016-05-021605026-0016.00 ppb
2016-05-021605026-0025.10 ppb
2016-05-021605031-002ND
2016-05-021605026-0034.20 ppb
2016-05-021605031-003ND
2016-05-031605134-0022.40 ppb
2016-05-031605134-0013.50 ppb
2016-05-031605136-0011.20 ppb
2016-05-031605134-0033.70 ppb
2016-05-131605C19-002ND
2016-05-131605C19-0016.50 ppb
2016-05-131605C22-001ND
2016-06-011606046-0025.40 ppb
2016-06-011606058-003ND
2016-06-011606043-0015.70 ppb
2016-06-011606046-0016.60 ppb
2016-06-011606046-0035.10 ppb
2016-06-011606058-002ND
2016-06-011606058-001ND
2016-06-021606176-0034.20 ppb
2016-06-021606174-0011.40 ppb
2016-06-021606176-0014.00 ppb
2016-06-021606173-001ND
2016-06-021606176-0023.10 ppb
2016-06-021606179-002ND
2016-06-021606179-0017.50 ppb
2016-07-011607038-002ND
2016-07-011607033-0034.70 ppb
2016-07-011607033-0015.50 ppb
2016-07-011607041-0015.40 ppb
2016-07-011607038-003ND
2016-07-011607033-0025.80 ppb
2016-07-011607038-001ND
2016-07-061607306-001ND
2016-07-061607304-002ND
2016-07-061607301-001ND
2016-07-061607304-0016.20 ppb
2016-07-201607G21-0013.10 ppb
2016-07-201607G21-003ND
2016-07-201607G21-0022.30 ppb
2016-08-011608023-0034.50 ppb
2016-08-011608030-003ND
2016-08-011608030-001ND
2016-08-011608023-0025.10 ppb
2016-08-011608029-0015.00 ppb
2016-08-011608030-002ND
2016-08-011608023-0016.00 ppb
2016-08-021608146-0022.50 ppb
2016-08-021608153-001ND
2016-08-021608150-002ND
2016-08-021608159-001ND
2016-08-021608150-0015.90 ppb
2016-08-021608146-0013.40 ppb
2016-08-021608146-003ND
2016-09-011609007-002ND
2016-09-011609009-0013.10 ppb
2016-09-011609011-0015.10 ppb
2016-09-011609007-001ND
2016-09-011609007-003ND
2016-09-011609009-003ND
2016-09-011609009-0022.30 ppb
2016-09-021609102-001ND
2016-09-061609226-002ND
2016-09-061609229-001ND
2016-09-061609226-0016.10 ppb
2016-09-141609A32-0015.00 ppb
2016-09-141609A32-0033.80 ppb
2016-09-141609A32-0025.00 ppb
2016-10-034010160024.80 ppb
2016-10-03701004001ND
2016-10-03701004002ND
2016-10-037010160034.00 ppb
2016-10-03701004003ND
2016-10-037010160014.90 ppb
2016-10-047010900015.70 ppb
2016-10-04701084001ND
2016-10-04701085001ND
2016-10-047010860022.20 ppb
2016-10-047010900021.40 ppb
2016-10-047010860012.90 ppb
2016-10-04701086003ND
2016-11-017033400015.00 ppb
2016-11-017033420014.80 ppb
2016-11-01703329002ND
2016-11-01703329003ND
2016-11-01703329001ND
2016-11-017033420025.00 ppb
2016-11-017033420034.40 ppb
2016-11-027034430013.40 ppb
2016-11-02703439002ND
2016-11-02703443003ND
2016-11-027034410011.20 ppb
2016-11-027034390016.40 ppb
2016-11-02703443002ND
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