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EWG's Tap Water Database — 2019 UPDATE

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Chlorite

City of Phoenix

Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide. Chlorite decreases hemoglobin levels and causes other hematologic effects. Read More.

Chlorite also forms when chlorine dioxide is used as a bleaching agent for textiles, paper pulp, flour and oils, and from the use of chlorine dioxide in food and packaging. In 2009, California published a public health goal of 50 parts per billion for chlorite in drinking water. California state scientists reported that chlorite causes red blood cell damage, affects sperm and thyroid function, and may alter behavior and neurodevelopment of rat pups exposed in the womb.

Click here to read more about disinfection byproducts.

 

620

Samples

0

Samples exceeding legal limit (MCL)

413

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201260.9 ppb174100ND - 267.0 ppb
2013157.4 ppb179155ND - 503.0 ppb
2014160.6 ppb9675ND - 400.0 ppb
2015138.2 ppb5142ND - 400.0 ppb
2016126.4 ppb6047ND - 466.0 ppb
2017125.1 ppb6047ND - 284.0 ppb

ppb = parts per billion

State and national drinking water standards and health guidelines

EWG Health Guideline 50 ppb

The EWG Health Guideline of 50 ppb for chlorite 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 change in blood chemistry.

EPA Maximum Contaminant
Level (MCL) 1,000 ppb

ppb = parts per billion

All test results

Date Lab ID Result
2012-01-062012001448ND
2012-01-062012001450ND
2012-01-062012001451ND
2012-01-062012001452ND
2012-01-062012001453ND
2012-01-062012001465ND
2012-01-062012001466ND
2012-01-06201200146729.0 ppb
2012-01-062012001469ND
2012-01-132012003048ND
2012-01-132012003049ND
2012-01-132012003050ND
2012-01-132012003052ND
2012-01-132012003053ND
2012-01-132012003054ND
2012-02-032012007759ND
2012-02-032012007760ND
2012-02-032012007761ND
2012-02-032012007762ND
2012-02-032012007763ND
2012-02-032012007764ND
2012-02-102012009484ND
2012-02-102012009485ND
2012-02-102012009486ND
2012-02-102012009509ND
2012-02-102012009510ND
2012-02-102012009511ND
2012-02-102012009538ND
2012-02-102012009539ND
2012-02-102012009540ND
2012-03-02201201410031.0 ppb
2012-03-022012014036ND
2012-03-02201201403711.0 ppb
2012-03-022012014038ND
2012-03-02201201409886.0 ppb
2012-03-02201201409935.0 ppb
2012-03-092012015710ND
2012-03-092012015711ND
2012-03-092012015712ND
2012-03-092012015724ND
2012-03-092012015725ND
2012-03-092012015773ND
2012-03-092012015774ND
2012-03-092012015775ND
2012-03-09201201577617.0 ppb
2012-04-13201202323127.0 ppb
2012-04-132012023232ND
2012-04-132012023233ND
2012-04-132012023237ND
2012-04-132012023238ND
2012-04-13201202332184.0 ppb
2012-04-13201202332246.0 ppb
2012-04-132012023323ND
2012-04-132012023324ND
2012-04-13201202332535.0 ppb
2012-04-132012023326ND
2012-04-132012023333ND
2012-04-13201203240ND
2012-04-13201203319ND
2012-04-1320120332084.0 ppb
2012-05-04201202865.0 ppb
2012-05-04201202844328.0 ppb
2012-05-042012028446ND
2012-05-042012028448ND
2012-05-04201202845071.0 ppb
2012-05-04201202852847.0 ppb
2012-05-042012028530164.0 ppb
2012-05-04201202853280.0 ppb
2012-05-04201202853551.0 ppb
2012-05-11201203050440.0 ppb
2012-05-112012030505ND
2012-05-112012030506ND
2012-05-112012030507ND
2012-05-112012030508ND
2012-05-112012030509ND
2012-06-142012038546ND
2012-06-142012038547ND
2012-06-142012038548ND
2012-06-14201203854939.0 ppb
2012-06-142012038550ND
2012-06-142012038551ND
2012-06-152012038735ND
2012-06-15201203873660.0 ppb
2012-06-152012038737ND
2012-06-202012040018108.0 ppb
2012-06-202012040019ND
2012-06-20201204002068.0 ppb
2012-06-20201204002144.0 ppb
2012-06-202012040022ND
2012-06-20201204002356.0 ppb
2012-07-05201204359555.0 ppb
2012-07-05201204359682.0 ppb
2012-07-05201204359739.0 ppb
2012-07-05201204359838.0 ppb
2012-07-05201204359925.0 ppb
2012-07-052012043600144.0 ppb
2012-07-052012043632ND
2012-07-05201204363348.0 ppb
2012-07-062012043774113.0 ppb
2012-07-062012043775122.0 ppb
2012-07-062012043776144.0 ppb
2012-07-132012045673180.0 ppb
2012-07-13201204567463.0 ppb
2012-07-13201204567592.0 ppb
2012-08-01201205016124.0 ppb
2012-08-012012050162ND
2012-08-01201205016362.0 ppb
2012-08-012012050164102.0 ppb
2012-08-01201205016576.0 ppb
2012-08-022012050464119.0 ppb
2012-08-022012050465137.0 ppb
2012-08-02201205046649.0 ppb
2012-08-022012050467140.0 ppb
2012-08-02201205046823.0 ppb
2012-08-022012050469167.0 ppb
2012-08-102012052591141.0 ppb
2012-08-102012052592165.0 ppb
2012-08-102012052593159.0 ppb
2012-09-07201205952026.0 ppb
2012-09-072012059521ND
2012-09-072012059522150.0 ppb
2012-09-072012059538ND
2012-09-07201205953920.0 ppb
2012-09-11201206028444.0 ppb
2012-09-11201206028565.0 ppb
2012-09-11201206028627.0 ppb
2012-09-112012060293134.0 ppb
2012-09-11201206029481.0 ppb
2012-09-11201206029582.0 ppb
2012-09-132012060928106.0 ppb
2012-09-13201206093093.0 ppb
2012-09-13201206092945.0 ppb
2012-10-05201206602038.0 ppb
2012-10-052012066021183.0 ppb
2012-10-052012066022192.0 ppb
2012-10-052012066069160.0 ppb
2012-10-052012066070184.0 ppb
2012-10-052012066071194.0 ppb
2012-10-09201206688677.0 ppb
2012-10-092012066887147.0 ppb
2012-10-092012066888161.0 ppb
2012-10-102012067289207.0 ppb
2012-10-102012067290151.0 ppb
2012-10-102012067291118.0 ppb
2012-10-112012067611ND
2012-10-11201206761281.0 ppb
2012-10-112012067613ND
2012-11-012012072721ND
2012-11-012012072722125.0 ppb
2012-11-01201207272371.0 ppb
2012-11-012012072724187.0 ppb
2012-11-012012072725171.0 ppb
2012-11-012012072726102.0 ppb
2012-11-022012073110156.0 ppb
2012-11-022012073111144.0 ppb
2012-11-022012073112115.0 ppb
2012-11-072012074035203.0 ppb
2012-11-07201207403693.0 ppb
2012-11-072012074037188.0 ppb
2012-12-072012080544195.0 ppb
2012-12-072012080545207.0 ppb
2012-12-072012080546167.0 ppb
2012-12-072012080661ND
2012-12-072012080662136.0 ppb
2012-12-072012080663ND
2012-12-072012080664157.0 ppb
2012-12-07201208066581.0 ppb
2012-12-072012080666168.0 ppb
2012-12-102012080905144.0 ppb
2012-12-102012080906182.0 ppb
2012-12-102012080907201.0 ppb
2012-12-132012081811215.0 ppb
2012-12-132012081812267.0 ppb
2012-12-132012081813240.0 ppb
2013-01-042013000971503.0 ppb
2013-01-042013000972476.0 ppb
2013-01-042013000973497.0 ppb
2013-01-042013001026361.0 ppb
2013-01-042013001027462.0 ppb
2013-01-042013001028469.0 ppb
2013-01-072013001460491.0 ppb
2013-01-072013001461424.0 ppb
2013-01-072013001462356.0 ppb
2013-01-082013001668284.0 ppb
2013-01-08201300166963.0 ppb
2013-01-08201300167040.0 ppb
2013-01-112013002552ND
2013-01-112013002553120.0 ppb
2013-01-11201300255439.0 ppb
2013-02-012013007635179.0 ppb
2013-02-012013007636149.0 ppb
2013-02-012013007637125.0 ppb
2013-02-052013008297257.0 ppb
2013-02-052013008298ND
2013-02-052013008299200.0 ppb
2013-02-062013008703216.0 ppb
2013-02-062013008704198.0 ppb
2013-02-062013008705227.0 ppb
2013-02-082013009302ND
2013-02-082013009303193.0 ppb
2013-02-082013009304213.0 ppb
2013-02-12201301021921.0 ppb
2013-02-122013010220205.0 ppb
2013-02-12201301022163.0 ppb
2013-03-012013014167ND
2013-03-012013014168215.0 ppb
2013-03-012013014169ND
2013-03-082013015661185.0 ppb
2013-03-082013015662203.0 ppb
2013-03-082013015663257.0 ppb
2013-03-11201301623591.0 ppb
2013-03-112013016236144.0 ppb
2013-03-112013016237128.0 ppb
2013-03-122013016452119.0 ppb
2013-03-122013016453124.0 ppb
2013-03-122013016454189.0 ppb
2013-03-152013017214134.0 ppb
2013-03-152013017215127.0 ppb
2013-03-152013017216182.0 ppb
2013-04-05201302198191.0 ppb
2013-04-052013021982ND
2013-04-052013021983ND
2013-04-052013021984ND
2013-04-05201302198540.0 ppb
2013-04-052013021986ND
2013-04-082013022566135.0 ppb
2013-04-082013022567156.0 ppb
2013-04-082013022568189.0 ppb
2013-04-092013022789176.0 ppb
2013-04-092013022790199.0 ppb
2013-04-092013022791185.0 ppb
2013-04-122013023760197.0 ppb
2013-04-122013023761203.0 ppb
2013-04-122013023762189.0 ppb
2013-05-032013028737235.0 ppb
2013-05-032013028738235.0 ppb
2013-05-032013028739117.0 ppb
2013-05-032013028806121.0 ppb
2013-05-032013028807197.0 ppb
2013-05-072013029471208.0 ppb
2013-05-072013029472216.0 ppb
2013-05-072013029473129.0 ppb
2013-05-082013029831131.0 ppb
2013-05-082013029832153.0 ppb
2013-05-082013029833185.0 ppb
2013-05-102013030434ND
2013-05-102013030435ND
2013-05-102013030436ND
2013-06-032013035310181.0 ppb
2013-06-03201303531183.0 ppb
2013-06-032013035312112.0 ppb
2013-06-06201303612484.0 ppb
2013-06-062013036125164.0 ppb
2013-06-062013036126193.0 ppb
2013-06-07201303644726.0 ppb
2013-06-072013036448141.0 ppb
2013-06-072013036449ND
2013-06-072013036499180.0 ppb
2013-06-072013036500185.0 ppb
2013-06-072013036501206.0 ppb
2013-06-122013037519160.0 ppb
2013-06-122013037520219.0 ppb
2013-06-122013037521113.0 ppb
2013-07-03201304183669.0 ppb
2013-07-032013041837145.0 ppb
2013-07-032013041838266.0 ppb
2013-07-03201304185960.0 ppb
2013-07-032013041860238.0 ppb
2013-07-032013041861100.0 ppb
2013-07-052013042364ND
2013-07-052013042365152.0 ppb
2013-07-052013042366ND
2013-07-102013043638140.0 ppb
2013-07-10201304363963.0 ppb
2013-07-102013043640161.0 ppb
2013-07-122013043940160.0 ppb
2013-07-122013043941191.0 ppb
2013-07-122013043939174.0 ppb
2013-08-012013048878ND
2013-08-012013048879156.0 ppb
2013-08-01201304888020.0 ppb
2013-08-022013049132143.0 ppb
2013-08-022013049133135.0 ppb
2013-08-022013049134155.0 ppb
2013-08-05201304956484.0 ppb
2013-08-052013049565118.0 ppb
2013-08-052013049566139.0 ppb
2013-08-052013049581261.0 ppb
2013-08-052013049582232.0 ppb
2013-08-052013049583193.0 ppb
2013-08-07201305049096.0 ppb
2013-08-07201305049199.0 ppb
2013-08-072013050492116.0 ppb
2013-09-04201305727187.0 ppb
2013-09-042013057272105.0 ppb
2013-09-04201305727394.0 ppb
2013-09-062013057867152.0 ppb
2013-09-062013057822ND
2013-09-06201305782388.0 ppb
2013-09-062013057824ND
2013-09-062013057868211.0 ppb
2013-09-062013057869186.0 ppb
2013-09-092013058188171.0 ppb
2013-09-092013058189121.0 ppb
2013-09-092013058190166.0 ppb
2013-09-11201305886477.0 ppb
2013-09-112013058865139.0 ppb
2013-09-112013058866135.0 ppb
2013-10-042013064709ND
2013-10-04201306471088.0 ppb
2013-10-04201306471150.0 ppb
2013-10-042013064714190.0 ppb
2013-10-042013064715205.0 ppb
2013-10-042013064716174.0 ppb
2013-10-092013065575274.0 ppb
2013-10-092013065576269.0 ppb
2013-10-092013065577135.0 ppb
2013-10-10201306577946.0 ppb
2013-10-10201306578079.0 ppb
2013-10-102013065781247.0 ppb
2013-10-102013065839178.0 ppb
2013-10-102013065840194.0 ppb
2013-10-102013065841220.0 ppb
2013-11-01201311070531ND
2013-11-0120131107053259.0 ppb
2013-11-0120131107053327.0 ppb
2013-11-07201311070534290.0 ppb
2013-11-07201311070535220.0 ppb
2013-11-07201311070536140.0 ppb
2013-11-08201311130470190.0 ppb
2013-11-08201311130471220.0 ppb
2013-11-08201311130472270.0 ppb
2013-11-13201311130481A240.0 ppb
2013-11-13201311130482A260.0 ppb
2013-11-13201311130483A260.0 ppb
2013-11-18201311180119A160.0 ppb
2013-11-18201311180120A290.0 ppb
2013-11-18201311180121A290.0 ppb
2013-12-03201312040855170.0 ppb
2013-12-03201312040856240.0 ppb
2013-12-03201312040854250.0 ppb
2013-12-06201312110764220.0 ppb
2013-12-06201312110765ND
2013-12-06201312110766ND
2013-12-06201312110770ND
2013-12-06201312110771230.0 ppb
2013-12-06201312110772ND
2013-12-06201312110778270.0 ppb
2013-12-06201312110779310.0 ppb
2013-12-06201312110780230.0 ppb
2013-12-13201312160089270.0 ppb
2013-12-13201312160090240.0 ppb
2013-12-13201312160091210.0 ppb
2014-01-02201401020087280.0 ppb
2014-01-02201401020088300.0 ppb
2014-01-02201401020089320.0 ppb
2014-01-03201401060070ND
2014-01-03201401060071240.0 ppb
2014-01-03201401060072110.0 ppb
2014-01-13201401140417400.0 ppb
2014-01-13201401140418380.0 ppb
2014-01-13201401140419340.0 ppb
2014-01-14201401140430310.0 ppb
2014-01-14201401140432230.0 ppb
2014-01-14201401140429280.0 ppb
2014-01-14201401140431270.0 ppb
2014-01-14201401140433290.0 ppb
2014-01-14201401140434300.0 ppb
2014-02-03201402040644270.0 ppb
2014-02-03201402040659270.0 ppb
2014-02-03201402040660360.0 ppb
2014-02-03201402040677370.0 ppb
2014-02-03201402040678380.0 ppb
2014-02-03201402040679370.0 ppb
2014-02-05201402060463280.0 ppb
2014-02-05201402060464280.0 ppb
2014-02-05201402060465300.0 ppb
2014-02-07201402120700ND
2014-02-07201402120701380.0 ppb
2014-02-0720140212070249.0 ppb
2014-02-07201402120708220.0 ppb
2014-02-07201402120709250.0 ppb
2014-02-07201402120710200.0 ppb
2014-03-0320140305067491.0 ppb
2014-03-03201403050675190.0 ppb
2014-03-03201403050676190.0 ppb
2014-03-04201403050660260.0 ppb
2014-03-04201403050661230.0 ppb
2014-03-04201403050662200.0 ppb
2014-03-04201403050669120.0 ppb
2014-03-04201403050670210.0 ppb
2014-03-04201403050671120.0 ppb
2014-03-07201403120642150.0 ppb
2014-03-07201403120645130.0 ppb
2014-03-07201403120646140.0 ppb
2014-03-11201403120657ND
2014-03-11201403120658180.0 ppb
2014-03-1120140312065958.0 ppb
2014-04-04201404080477170.0 ppb
2014-04-04201404080478170.0 ppb
2014-04-04201404080479120.0 ppb
2014-04-0720140408046964.0 ppb
2014-04-07201404080470A110.0 ppb
2014-04-07201404080471A140.0 ppb
2014-04-08201404090629120.0 ppb
2014-04-08201404090630180.0 ppb
2014-04-08201404090631220.0 ppb
2014-04-11201404160748180.0 ppb
2014-04-11201404160749230.0 ppb
2014-04-11201404160750270.0 ppb
2014-04-11201404160755ND
2014-04-11201404160756160.0 ppb
2014-04-1120140416075731.0 ppb
2014-05-02201405060690ND
2014-05-02201405060691ND
2014-05-02201405060692ND
2014-05-06201405060714110.0 ppb
2014-05-06201405060715200.0 ppb
2014-05-06201405060716190.0 ppb
2014-05-07201405070452ND
2014-05-07201405070453130.0 ppb
2014-05-0720140507045479.0 ppb
2014-05-12201405140705ND
2014-05-1220140514070634.0 ppb
2014-05-12201405140707ND
2014-06-0220140604056451.0 ppb
2014-06-02201406040565ND
2014-06-02201406040566ND
2014-06-02201406040571240.0 ppb
2014-06-02201406040572290.0 ppb
2014-06-02201406040573300.0 ppb
2014-06-05201406090030ND
2014-06-05201406090031ND
2014-06-05201406090032AND
2014-06-06201406110766ND
2014-06-06201406110767ND
2014-06-06201406110768ND
2014-10-012014064516136.0 ppb
2014-10-012014064517103.0 ppb
2014-10-012014064518178.0 ppb
2014-10-022014064709148.0 ppb
2014-10-022014064710ND
2014-10-022014064711151.0 ppb
2014-10-032014065220ND
2014-10-032014065221219.0 ppb
2014-10-032014065222ND
2014-10-102014066589166.0 ppb
2014-10-102014066590190.0 ppb
2014-10-10201406659135.0 ppb
2015-01-052015000745107.0 ppb
2015-01-05201500074652.0 ppb
2015-01-052015000747400.0 ppb
2015-01-062015001007ND
2015-01-062015001008278.0 ppb
2015-01-062015001009ND
2015-01-092015001670195.0 ppb
2015-01-092015001671189.0 ppb
2015-01-092015001672ND
2015-01-122015002404218.0 ppb
2015-01-122015002405114.0 ppb
2015-01-12201500240699.0 ppb
2015-01-162015003521201.0 ppb
2015-01-162015003522166.0 ppb
2015-01-162015003523190.0 ppb
2015-04-022015022431111.0 ppb
2015-04-022015022432225.0 ppb
2015-04-022015022433227.0 ppb
2015-04-032015022329252.0 ppb
2015-04-032015022330272.0 ppb
2015-04-032015022331208.0 ppb
2015-04-032015022790ND
2015-04-032015022791178.0 ppb
2015-04-03201502279297.0 ppb
2015-04-062015023238163.0 ppb
2015-04-062015023239339.0 ppb
2015-04-062015023240322.0 ppb
2015-04-102015024183277.0 ppb
2015-04-102015024184226.0 ppb
2015-04-102015024185261.0 ppb
2015-07-152015047180129.0 ppb
2015-07-152015047181128.0 ppb
2015-07-152015047182120.0 ppb
2015-07-242015049694167.0 ppb
2015-07-24201504969584.0 ppb
2015-07-242015049696100.0 ppb
2015-10-02201506643966.0 ppb
2015-10-02201506644074.0 ppb
2015-10-022015066441ND
2015-10-05201506683835.0 ppb
2015-10-05201506683965.0 ppb
2015-10-05201506684022.0 ppb
2015-10-092015068287ND
2015-10-092015068288ND
2015-10-092015068289ND
2015-10-212015071201ND
2015-10-212015071202115.0 ppb
2015-10-212015071203188.0 ppb
2015-10-302015073461270.0 ppb
2015-10-30201507346298.0 ppb
2015-10-30201507346321.0 ppb
2016-01-062016000959114.0 ppb
2016-01-062016000960214.0 ppb
2016-01-062016000961224.0 ppb
2016-01-062016000976273.0 ppb
2016-01-062016000977191.0 ppb
2016-01-062016000978293.0 ppb
2016-01-082016001600285.0 ppb
2016-01-082016001601312.0 ppb
2016-01-082016001602294.0 ppb
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