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EWG's Tap Water Database — 2021 UPDATE

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Perchlorate

Hicksville 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.

MORE ABOUT THIS CONTAMINANT

 

967

Samples

0

Samples exceeding legal limit (MCL)

729

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
20142.55 ppb154140ND - 9.20 ppb
20152.12 ppb9888ND - 5.40 ppb
20162.09 ppb184153ND - 10.6 ppb
20171.56 ppb188122ND - 5.10 ppb
20181.97 ppb165129ND - 6.30 ppb
20191.46 ppb178123ND - 5.00 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
2014-01-081401243-003-POCS3.00 ppb
2014-01-081401243-001-POCS3.00 ppb
2014-01-091401340-001-POCS1.70 ppb
2014-01-091401340-006-POCS1.80 ppb
2014-01-091401340-005-POCS1.80 ppb
2014-01-091401340-0042.10 ppb
2014-01-091401340-007-POCS2.80 ppb
2014-01-091401340-002-POCS4.10 ppb
2014-01-151401660-0071.000 ppb
2014-01-151401660-005-POCS1.40 ppb
2014-01-151401660-001-POCS7.10 ppb
2014-01-151401660-002-POCS4.60 ppb
2014-01-151401660-004-POCS1.10 ppb
2014-02-041402072-001-POCS7.10 ppb
2014-02-041402072-002-POCS4.20 ppb
2014-02-061402254-002-POCS3.00 ppb
2014-02-061402254-001-POCS2.70 ppb
2014-02-101402374-002-POCS2.70 ppb
2014-02-101402375-0042.00 ppb
2014-02-101402374-003-POCS2.50 ppb
2014-02-101402375-002-POCS3.60 ppb
2014-02-101402374-001-POCS2.30 ppb
2014-02-101402375-001-POCS1.60 ppb
2014-02-241402B82-001-POCS1.10 ppb
2014-02-241402B82-004ND
2014-02-241402B82-002-POCS1.30 ppb
2014-03-051403214-002-POCS4.10 ppb
2014-03-051403271-001-POCS2.80 ppb
2014-03-051403214-0042.20 ppb
2014-03-051403214-001-POCS1.60 ppb
2014-03-061403369-0022.30 ppb
2014-03-061403369-0012.30 ppb
2014-03-061403369-0032.50 ppb
2014-03-101403523-002-POCS4.40 ppb
2014-03-101403523-001-POCS7.60 ppb
2014-03-121403814-002-POCS1.30 ppb
2014-03-121403814-004ND
2014-03-121403814-001-POCSND
2014-03-131403955-001-POCS2.70 ppb
2014-04-081404650-001-POCS2.90 ppb
2014-04-101404858-001-POCS8.70 ppb
2014-04-101404858-002-POCS5.00 ppb
2014-04-101404858-004-POCS2.80 ppb
2014-04-161404C10-003-POCS2.40 ppb
2014-04-161404C10-001-POCS2.50 ppb
2014-04-161404C10-002-POCS2.90 ppb
2014-04-161404C09-0042.20 ppb
2014-04-161404C09-001-POCS1.70 ppb
2014-04-161404C09-002-POCS4.30 ppb
2014-04-241404I07-001-PRI3.80 ppb
2014-04-241404I07-0042.00 ppb
2014-04-241404I07-0053.70 ppb
2014-04-281404J73-002-POCS1.40 ppb
2014-04-281404J73-004ND
2014-05-131405890-003-POCS2.40 ppb
2014-05-131405890-002-POCS2.50 ppb
2014-05-131405892-001-POCS2.80 ppb
2014-05-131405892-003-POCS9.20 ppb
2014-05-131405890-001-POCS2.40 ppb
2014-05-131405892-002-POCS4.60 ppb
2014-05-141405984-001-POCS1.60 ppb
2014-05-141405984-0042.00 ppb
2014-05-141405984-002-POCS3.70 ppb
2014-05-141405985-001-POCS2.70 ppb
2014-05-281405J08-003ND
2014-05-281405J08-001-POCS1.20 ppb
2014-05-291405K22-001-POCS3.30 ppb
2014-06-121406959-001-POCS2.70 ppb
2014-06-161406A81-001-POCS1.60 ppb
2014-06-161406A81-0042.10 ppb
2014-06-161406A81-002-POCS3.30 ppb
2014-06-161406B18-002-POCS4.80 ppb
2014-06-171406C40-001-POCS1.10 ppb
2014-06-171406C40-002-POCS1.30 ppb
2014-06-171406C40-004ND
2014-06-191406E69-001-POCS3.80 ppb
2014-06-231406G47-001-POCS2.50 ppb
2014-06-231406G47-003-POCS2.20 ppb
2014-06-231406G47-002-POCS2.40 ppb
2014-06-231406G10-001-POCS2.80 ppb
2014-07-151407B08-006-POCS2.90 ppb
2014-07-151407B08-004-POCS4.20 ppb
2014-07-151407B08-003-POCS6.90 ppb
2014-07-151407B08-001-POCS2.70 ppb
2014-07-161407B24-001-POCS1.50 ppb
2014-07-161407B25-005-POCS2.00 ppb
2014-07-161407B25-004-POCS2.40 ppb
2014-07-161407B25-003-POCS2.60 ppb
2014-07-161407B24-004-POCS2.20 ppb
2014-07-161407B25-001-POCS3.50 ppb
2014-07-161407B24-002-POCS3.50 ppb
2014-07-221407F88-001-POCS1.10 ppb
2014-07-221407F88-004ND
2014-07-221407FBB-002-POCS1.50 ppb
2014-08-051408236-002-POCS4.60 ppb
2014-08-051408236-001-POCS7.20 ppb
2014-08-111408621-006-POCS3.00 ppb
2014-08-111408616-005-POCS1.70 ppb
2014-08-111408621-002-POCS2.90 ppb
2014-08-111408616-006-POCS3.70 ppb
2014-08-111408621-001-POCS2.70 ppb
2014-08-111408621-003-POCS2.20 ppb
2014-08-111408616-001-POCS2.70 ppb
2014-08-111408616-0082.20 ppb
2014-08-131408899-002-PRI4.80 ppb
2014-08-181408B74-001-POCS3.80 ppb
2014-08-201408E36-004ND
2014-08-201408E36-001-POCS1.000 ppb
2014-08-201408E36-002-POCS1.30 ppb
2014-09-081409499-001-POCS2.80 ppb
2014-09-081409497-002-POCS3.50 ppb
2014-09-081409498-001-POCS3.70 ppb
2014-09-081409497-0041.90 ppb
2014-09-101409779-002-POCS1.20 ppb
2014-09-101409779-004ND
2014-09-101409779-001-POCS1.10 ppb
2014-09-101409755-002-POCS3.00 ppb
2014-09-101409755-001-POCS3.00 ppb
2014-09-101409755-003-POCS2.10 ppb
2014-09-171409C62-001-POCS2.80 ppb
2014-10-061410313-002-POCS3.50 ppb
2014-10-061410313-0041.80 ppb
2014-10-061410310-001-POCS3.50 ppb
2014-10-061410315-001-POCS2.90 ppb
2014-10-061410313-001-POCS1.60 ppb
2014-10-091410710-001-POCS3.20 ppb
2014-10-141410926-001-POCS2.70 ppb
2014-10-141410926-003-POCS2.20 ppb
2014-10-141410926-002-POCS2.80 ppb
2014-10-161410B38-004ND
2014-10-161410B38-001-POCS1.10 ppb
2014-10-161410B36-002-POCS1.50 ppb
2014-11-131411905-002-POCS3.70 ppb
2014-11-131411905-001-POCS1.80 ppb
2014-11-131411905-0042.10 ppb
2014-11-171411A84-002-POCS2.20 ppb
2014-11-171411A84-001-POCS2.80 ppb
2014-11-181411B73-001-POCSND
2014-11-181411B73-004ND
2014-11-181411B73-002-POCSND
2014-11-241411G29-002-POCS1.80 ppb
2014-11-241411G29-003-POCS1.80 ppb
2014-11-241411G29-001-POCS2.60 ppb
2014-12-031412238-002-POCS2.10 ppb
2014-12-031412238-001-POCS3.40 ppb
2014-12-031412238-004-POCS1.90 ppb
2014-12-041412353-001-POCS1.10 ppb
2014-12-041412353-002-POCS1.30 ppb
2014-12-041412353-004ND
2014-12-081412532-001-POCS2.60 ppb
2014-12-081412532-003-POCS3.00 ppb
2014-12-221412G53-001-POCS1.60 ppb
2014-12-221412G53-002-POCS3.50 ppb
2014-12-221412G53-0041.90 ppb
2015-01-131501631-001-POCS2.70 ppb
2015-01-131501631-0061.90 ppb
2015-01-131501727-001-POCS2.80 ppb
2015-01-131501631-003-POCS1.30 ppb
2015-01-131501631-004-POCS3.30 ppb
2015-01-201501B75-002-POCS1.30 ppb
2015-01-201501B75-004ND
2015-01-201501B75-001-POCSND
2015-01-211501C12-003-POCS2.10 ppb
2015-01-211501C12-002-POCS1.80 ppb
2015-01-211501C12-001-POCS2.30 ppb
2015-02-101502622-0011.90 ppb
2015-02-101502622-0042.20 ppb
2015-02-101502623-001-POCS2.90 ppb
2015-02-101502622-001-POCS1.90 ppb
2015-02-101502622-002-POCS3.80 ppb
2015-02-171502A12-0012.70 ppb
2015-02-181502A48-0021.50 ppb
2015-02-181502A48-0041.20 ppb
2015-02-181502A48-0011.20 ppb
2015-02-251502F01-0012.40 ppb
2015-03-101503657-0013.10 ppb
2015-03-111503748-0041.30 ppb
2015-03-111503745-0023.90 ppb
2015-03-111503748-0031.10 ppb
2015-03-111503745-0042.40 ppb
2015-03-111503748-002ND
2015-03-111503745-0012.10 ppb
2015-03-121503866-0013.20 ppb
2015-03-311503L97-0012.50 ppb
2015-04-201504E38-002-POCS4.30 ppb
2015-04-201504E38-0042.80 ppb
2015-04-201504E38-001-POCS2.40 ppb
2015-04-201504E40-001-POCS3.40 ppb
2015-04-211504G27-001-POCS3.70 ppb
2015-04-231504H89-0011.50 ppb
2015-04-231504H89-004ND
2015-04-231504H89-0021.50 ppb
2015-05-041505132-001 PRI3.20 ppb
2015-05-111505731-001 PRI3.70 ppb
2015-05-181505C53-0023.70 ppb
2015-05-181505C53-0011.90 ppb
2015-05-181505C53-0042.20 ppb
2015-05-181505C51-0012.70 ppb
2015-05-191505D87-003ND
2015-05-191505D73-0013.40 ppb
2015-05-191505D97-0021.30 ppb
2015-05-191505D87-0011.10 ppb
2015-05-201505E53-001ND
2015-05-201505E53-0022.20 ppb
2015-05-201505E53-004ND
2015-06-091506792-001-POCS3.40 ppb
2015-06-101506872-001-POCS4.50 ppb
2015-06-111506982-002-POCS1.60 ppb
2015-06-111506982-0031.10 ppb
2015-06-111506982-001-POCS1.30 ppb
2015-06-151506B72-001-POCS5.40 ppb
2015-06-151506B72-002-POCS3.50 ppb
2015-06-151506B72-004ND
2015-06-171506E08-0031.10 ppb
2015-06-171506E08-002-POCS1.50 ppb
2015-06-171506E08-001ND
2015-06-241506J46-001-POCS1.000 ppb
2015-07-151507A50-004-POCS3.70 ppb
2015-07-151507A50-003-POCS2.00 ppb
2015-07-221507F73-001-POCS4.00 ppb
2015-07-221510A24-002-POCS1.40 ppb
2015-07-281507K45-004ND
2015-08-101508679-004-POCS2.50 ppb
2015-08-111508883-001-POCS2.20 ppb
2015-08-121508967-001-POCS1.40 ppb
2015-08-171508D13-002-POCS1.60 ppb
2015-08-181508D74-001-POCS1.000 ppb
2015-08-181508D74-003-POCS2.00 ppb
2015-08-181508D74-002-POCS1.000 ppb
2015-09-101509J31-004-POCS3.70 ppb
2015-09-101509753-003-POCS1.80 ppb
2015-09-101509753-002-POCS1.40 ppb
2015-09-241509J31-0032.10 ppb
2015-10-141510A24-001-POCS1.10 ppb
2015-10-151510B83-002-POCS3.40 ppb
2015-10-151510B83-001-POCS1.90 ppb
2015-10-221510H30-0032.40 ppb
2015-10-221510H30-002-POCS2.30 ppb
2015-11-101511798-001-POCS2.60 ppb
2015-11-101511800-002-POCS2.90 ppb
2015-11-161511C17-002-POCS2.20 ppb
2015-11-161511B98-002-POCS3.50 ppb
2015-11-171511D66-001-POCS1.60 ppb
2015-11-191511F81-003-POCS2.40 ppb
2015-11-191511F81-001-POCS1.80 ppb
2015-11-191511F81-002-POCS2.10 ppb
2015-11-241512883-003-POCS1.70 ppb
2015-12-101512883-004-POCS3.50 ppb
2015-12-101512916-001-POCS2.50 ppb
2015-12-171512F04-001-POCS2.20 ppb
2015-12-171512F04-002-POCS2.90 ppb
2015-12-171512F04-003-POCS2.60 ppb
2016-01-111601536-0041.90 ppb
2016-01-111601536-001-POCS2.40 ppb
2016-01-111601536-0061.000 ppb
2016-01-111601536-0031.000 ppb
2016-01-141601953-0011.50 ppb
2016-01-141601953-0042.10 ppb
2016-01-141601953-0023.30 ppb
2016-01-211601E79-002-POCS1.10 ppb
2016-01-211601E79-0031.000 ppb
2016-01-211601E79-0011.000 ppb
2016-01-251601G12-002-POCS2.30 ppb
2016-01-251601G12-001-POCS2.80 ppb
2016-01-251601G12-0031.80 ppb
2016-02-031602240-003ND
2016-02-031602240-0012.10 ppb
2016-02-031602239-0012.50 ppb
2016-02-041602434-0021.10 ppb
2016-02-041602434-001-POCSND
2016-02-041602434-004ND
2016-02-081602607-0032.70 ppb
2016-02-081602607-0011.80 ppb
2016-02-081602607-0022.40 ppb
2016-02-091602691-0023.60 ppb
2016-02-091602691-0042.20 ppb
2016-02-091602777-0012.80 ppb
2016-02-191602691-0011.80 ppb
2016-02-231602G18-0012.80 ppb
2016-02-231602G18-003-POCS1.80 ppb
2016-03-081603663-0013.50 ppb
2016-03-091603749-002-POCS1.10 ppb
2016-03-091603749-001ND
2016-03-091603749-004ND
2016-03-141603B11-0012.50 ppb
2016-03-141603A96-0012.30 ppb
2016-03-151603B95-0041.80 ppb
2016-03-151603B95-0011.80 ppb
2016-03-151603B95-0023.30 ppb
2016-03-171603E67-0034.70 ppb
2016-03-171603E67-00210.6 ppb
2016-03-221603H18-0029.50 ppb
2016-03-221603H18-0032.00 ppb
2016-03-22160H18-0032.00 ppb
2016-04-121604A81-003ND
2016-04-121604A81-0011.90 ppb
2016-04-131604C35-0032.30 ppb
2016-04-211604K51-0019.20 ppb
2016-04-211604K51-0023.60 ppb
2016-04-261604N31-001ND
2016-04-261604N30-0042.10 ppb
2016-04-261604N30-001-POCS1.70 ppb
2016-04-261604N31-002ND
2016-04-261604N31-004ND
2016-04-261604N30-0023.40 ppb
2016-04-271604O77-0022.70 ppb
2016-04-271604O77-0032.50 ppb
2016-04-271604O77-0011.80 ppb
2016-05-161605D46-0023.70 ppb
2016-05-161605D49-0021.10 ppb
2016-05-161605D48-0023.80 ppb
2016-05-161605D46-0042.30 ppb
2016-05-161605D48-001ND
2016-05-161605D46-0011.90 ppb
2016-05-161605D49-0011.000 ppb
2016-05-161605D49-0041.000 ppb
2016-05-171605F52-0012.60 ppb
2016-05-171605F44-001-SECND
2016-05-181605G37-0032.70 ppb
2016-05-181605G37-002-POCS2.90 ppb
2016-05-231605K26-0012.90 ppb
2016-05-271605Q39-0031.000 ppb
2016-05-271605Q39-004ND
2016-05-271605Q39-0021.60 ppb
2016-06-061606465-0041.80 ppb
2016-06-061606465-002-POCS2.10 ppb
2016-06-061606465-0022.10 ppb
2016-06-061606471-0016.20 ppb
2016-06-061606465-0011.50 ppb
2016-06-081606711-0011.000 ppb
2016-06-082902829ND
2016-06-081606711-0041.000 ppb
2016-06-081606711-0021.20 ppb
2016-06-091606913-0013.20 ppb
2016-06-091606913-0022.60 ppb
2016-06-091606913-0032.40 ppb
2016-06-201606J13-0012.80 ppb
2016-06-211606J95-0023.70 ppb
2016-06-211606J95-0042.30 ppb
2016-07-131607983-0041.10 ppb
2016-07-131607983-001ND
2016-07-131607983-0022.30 ppb
2016-07-131607984-0014.30 ppb
2016-07-201607G17-0023.80 ppb
2016-07-201607G17-0014.10 ppb
2016-07-201607G27-0011.000 ppb
2016-07-201607G27-002ND
2016-07-201607G19-0011.60 ppb
2016-07-201607G19-0042.00 ppb
2016-07-201607G27-0041.000 ppb
2016-07-211607176-0012.80 ppb
2016-07-211607I17-0013.10 ppb
2016-07-271607N53-0012.60 ppb
2016-07-271607N53-0022.20 ppb
2016-07-271607N53-0034.10 ppb
2016-08-111608B65-0023.70 ppb
2016-08-111608B65-0014.20 ppb
2016-08-171608G30-0011.40 ppb
2016-08-171608G26-002ND
2016-08-171608G26-004ND
2016-08-171608G30-0023.00 ppb
2016-08-181608F84-0013.20 ppb
2016-08-241608M86-0012.50 ppb
2016-08-241608M89-0013.20 ppb
2016-08-291608Q22-011ND
2016-08-291608Q22-022ND
2016-08-291608Q22-004ND
2016-08-301608R68-0022.10 ppb
2016-08-301608R68-001-POCS2.40 ppb
2016-08-301608R68-0032.10 ppb
2016-09-121609794-002-PRI4.00 ppb
2016-09-121609794-001-PRI3.70 ppb
2016-09-131609A01-001-PRI3.90 ppb
2016-09-131600A01-002-PRIND
2016-09-131609A01-002-PRIND
2016-09-141609B48-002-PRI1.70 ppb
2016-09-141609B48-0041.10 ppb
2016-09-141609B71-0021.20 ppb
2016-09-141609B48-001-PRI1.70 ppb
2016-09-141609B74-001-PRIND
2016-09-141609B71-003ND
2016-09-141609B71-0011.000 ppb
2016-09-151609C74-001-PRI2.90 ppb
2016-09-201609G74-0041.90 ppb
2016-09-201609G74-0033.20 ppb
2016-09-211609H81-001-PRI2.30 ppb
2016-09-211609H81-003-PRI2.30 ppb
2016-09-211609H81-002-PRI2.00 ppb
2016-10-127018470013.20 ppb
2016-10-127018470023.60 ppb
2016-10-187022830011.60 ppb
2016-10-187022830023.10 ppb
2016-10-187022830041.70 ppb
2016-10-247027370041.20 ppb
2016-10-247027370011.60 ppb
2016-10-24702765002ND
2016-10-247027650014.60 ppb
2016-10-247027370021.50 ppb
2016-10-24702737001-POCS1.60 ppb
2016-10-257029250013.10 ppb
2016-10-257029240012.80 ppb
2016-10-26702970001ND
2016-10-26702970002-POCS2.70 ppb
2016-10-267029700032.70 ppb
2016-10-317019970013.30 ppb
2016-11-077038250011.80 ppb
2016-11-07703824001-POCS3.40 ppb
2016-11-077038250041.60 ppb
2016-11-077038250023.10 ppb
2016-11-077038240024.10 ppb
2016-11-097040520041.10 ppb
2016-11-097040560013.00 ppb
2016-11-09704056002ND
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2019-10-09701078610092.10 ppb
2019-10-09701078610082.10 ppb
2019-10-0970107861003ND
2019-10-16701086180011.80 ppb
2019-10-16701086180021.000 ppb
2019-10-16701086180041.30 ppb
2019-10-1770108819001ND
2019-10-1770108819004ND
2019-10-1770108819002ND
2019-10-21701091250024.20 ppb
2019-10-21701091250013.70 ppb
2019-10-21701091250043.00 ppb
2019-10-22701092760015.00 ppb
2019-10-24701096210012.90 ppb
2019-11-06701108280012.60 ppb
2019-11-06701108280034.20 ppb
2019-11-07701110770021.80 ppb
2019-11-07701110770011.40 ppb
2019-11-07701110770041.20 ppb
2019-11-12701115370021.80 ppb
2019-11-12701115370041.10 ppb
2019-11-12701115370011.20 ppb
2019-11-1270115370011.20 ppb
2019-11-14701119600021.50 ppb
2019-11-14701119600012.60 ppb
2019-11-14701119600031.50 ppb
2019-11-1411/14/20191.50 ppb
2019-11-18701122130024.20 ppb
2019-11-18701122130012.80 ppb
2019-11-2070112526002ND
2019-11-2070112526001ND
2019-11-2070112526004ND
2019-12-04701140190013.80 ppb
2019-12-04701140170012.40 ppb
2019-12-09701145600012.20 ppb
2019-12-09701145600021.40 ppb
2019-12-09701145600031.40 ppb
2019-12-1170114992001ND
2019-12-1170114992004ND
2019-12-1170114992002ND
2019-12-1270115194004ND
2019-12-12701151940011.80 ppb
2019-12-12701151940031.70 ppb