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EWG's Tap Water Database — 2021 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.

MORE ABOUT THIS CONTAMINANT

 

387

Samples

0

Samples exceeding legal limit (MCL)

265

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014160.6 ppb9675ND - 400.0 ppb
2015138.2 ppb5142ND - 400.0 ppb
2016126.4 ppb6047ND - 466.0 ppb
2017125.1 ppb6047ND - 284.0 ppb
201899.4 ppb6046ND - 308.0 ppb
2019122.4 ppb6051ND - 481.0 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
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
2016-01-082016001608ND
2016-01-082016001609133.0 ppb
2016-01-082016001610ND
2016-01-152016003333466.0 ppb
2016-01-152016003334189.0 ppb
2016-01-152016003335389.0 ppb
2016-04-012016020693ND
2016-04-012016020695167.0 ppb
2016-04-012016020697ND
2016-04-08201602152197.0 ppb
2016-04-08201602152384.0 ppb
2016-04-082016021525ND
2016-04-19201602431893.0 ppb
2016-04-192016024320ND
2016-04-19201602432275.0 ppb
2016-04-22201602338729.0 ppb
2016-04-22201602338944.0 ppb
2016-04-22201602339146.0 ppb
2016-04-282016025638255.0 ppb
2016-04-282016025640301.0 ppb
2016-04-282016025642202.0 ppb
2016-07-062016043594138.0 ppb
2016-07-062016043596ND
2016-07-062016043598143.0 ppb
2016-07-082016044181136.0 ppb
2016-07-08201604418327.0 ppb
2016-07-08201604418526.0 ppb
2016-07-152016045938ND
2016-07-152016045940ND
2016-07-152016045942ND
2016-07-212016047068ND
2016-07-21201604707074.0 ppb
2016-07-21201604707252.0 ppb
2016-07-222016046455198.0 ppb
2016-07-222016046457221.0 ppb
2016-07-222016046459144.0 ppb
2016-10-072016065721166.0 ppb
2016-10-072016065723109.0 ppb
2016-10-07201606572599.0 ppb
2016-10-11201606781448.0 ppb
2016-10-112016067816134.0 ppb
2016-10-11201606781856.0 ppb
2016-10-142016068830ND
2016-10-14201606883229.0 ppb
2016-10-14201606883436.0 ppb
2016-10-182016069775115.0 ppb
2016-10-182016069777154.0 ppb
2016-10-182016069779ND
2016-10-212016069794215.0 ppb
2016-10-212016069796268.0 ppb
2016-10-212016069798227.0 ppb
2017-01-062017001002243.0 ppb
2017-01-062017001004263.0 ppb
2017-01-062017001006246.0 ppb
2017-01-132017001282284.0 ppb
2017-01-132017001284236.0 ppb
2017-01-132017001286262.0 ppb
2017-01-13201700324694.0 ppb
2017-01-132017003248ND
2017-01-132017003250151.0 ppb
2017-01-192017004487243.0 ppb
2017-01-192017004489232.0 ppb
2017-01-192017004491225.0 ppb
2017-02-242017013365ND
2017-02-24201701336794.0 ppb
2017-02-24201701336964.0 ppb
2017-04-13201702973549.0 ppb
2017-04-132017029737190.0 ppb
2017-04-132017029739ND
2017-04-142017028906ND
2017-04-14201702891059.0 ppb
2017-04-14201703890858.0 ppb
2017-04-212017030154176.0 ppb
2017-04-212017030156141.0 ppb
2017-04-21201703015888.0 ppb
2017-04-27201703290088.0 ppb
2017-04-272017032902113.0 ppb
2017-04-272017032904123.0 ppb
2017-04-282017031747213.0 ppb
2017-04-282017031749238.0 ppb
2017-04-282017031751199.0 ppb
2017-07-07201705039359.0 ppb
2017-07-072017050395ND
2017-07-072017050397ND
2017-07-132017054043ND
2017-07-13201705404537.0 ppb
2017-07-132017054047ND
2017-07-212017056648176.0 ppb
2017-07-212017056650207.0 ppb
2017-07-212017056652142.0 ppb
2017-07-262017057378ND
2017-07-262017057380ND
2017-07-262017057382ND
2017-07-27201705892756.0 ppb
2017-07-27201705892932.0 ppb
2017-07-272017058931ND
2017-10-022017075990179.0 ppb
2017-10-022017075992148.0 ppb
2017-10-022017075994108.0 ppb
2017-10-062017077187191.0 ppb
2017-10-062017077189186.0 ppb
2017-10-062017077191188.0 ppb
2017-10-122017077882136.0 ppb
2017-10-122017077884113.0 ppb
2017-10-122017077886103.0 ppb
2017-10-132017079581152.0 ppb
2017-10-132017079583200.0 ppb
2017-10-132017079585ND
2017-10-202017079400251.0 ppb
2017-10-202017079402272.0 ppb
2017-10-202017079404196.0 ppb
2018-01-032018000415150.0 ppb
2018-01-032018000417241.0 ppb
2018-01-032018000419188.0 ppb
2018-01-04201800023957.0 ppb
2018-01-042018000241271.0 ppb
2018-01-042018000243215.0 ppb
2018-01-122018002388271.0 ppb
2018-01-122018002390308.0 ppb
2018-01-122018002392269.0 ppb
2018-01-192018003009117.0 ppb
2018-01-192018003011116.0 ppb
2018-01-192018003013112.0 ppb
2018-01-262018004633180.0 ppb
2018-01-262018004635255.0 ppb
2018-01-262018004637ND
2018-04-02201802106776.0 ppb
2018-04-022018021069ND
2018-04-02201802107194.0 ppb
2018-04-06201802221054.0 ppb
2018-04-062018022212ND
2018-04-06201802221479.0 ppb
2018-04-132018024491203.0 ppb
2018-04-132018024493249.0 ppb
2018-04-132018024495199.0 ppb
2018-04-202018025930ND
2018-04-20201802593238.0 ppb
2018-04-20201802593449.0 ppb
2018-04-26201802912246.0 ppb
2018-04-262018029124250.0 ppb
2018-04-262018029126ND
2018-07-06201804499690.0 ppb
2018-07-062018044998ND
2018-07-06201804500093.0 ppb
2018-07-13201804818353.0 ppb
2018-07-132018048185ND
2018-07-132018048187ND
2018-07-19201804898242.0 ppb
2018-07-19201804898467.0 ppb
2018-07-19201804898643.0 ppb
2018-07-202018046398227.0 ppb
2018-07-202018046400242.0 ppb
2018-07-202018046402187.0 ppb
2018-07-27201805201926.0 ppb
2018-07-272018052021ND
2018-07-272018052023ND
2018-10-05201806787467.0 ppb
2018-10-052018067876171.0 ppb
2018-10-052018067878119.0 ppb
2018-10-112018070145ND
2018-10-11201807014779.0 ppb
2018-10-112018070149ND
2018-10-122018071602119.0 ppb
2018-10-12201807160424.0 ppb
2018-10-12201807160638.0 ppb
2018-10-192018073510ND
2018-10-19201807351277.0 ppb
2018-10-192018073514ND
2018-10-26201807491452.0 ppb
2018-10-26201807491631.0 ppb
2018-10-26201807491831.0 ppb
2019-01-022018089630258.0 ppb
2019-01-022018089632265.0 ppb
2019-01-022018089634245.0 ppb
2019-01-042018089499239.0 ppb
2019-01-04201808950143.0 ppb
2019-01-04201808950389.0 ppb
2019-01-112019001972412.0 ppb
2019-01-112019001974319.0 ppb
2019-01-112019001976388.0 ppb
2019-01-182019002118289.0 ppb
2019-01-182019002120330.0 ppb
2019-01-182019002122109.0 ppb
2019-01-25201900627331.0 ppb
2019-01-252019006275267.0 ppb
2019-01-252019006277ND
2019-04-082019026680137.0 ppb
2019-04-082019026682146.0 ppb
2019-04-082019026684115.0 ppb
2019-04-122019027770ND
2019-04-122019027772188.0 ppb
2019-04-122019027774ND
2019-04-192019028136278.0 ppb
2019-04-192019028138324.0 ppb
2019-04-192019028140253.0 ppb
2019-04-26201902980393.0 ppb
2019-04-26201902980568.0 ppb
2019-04-26201902980781.0 ppb
2019-05-032019031177ND
2019-05-03201903117940.0 ppb
2019-05-03201903118126.0 ppb
2019-07-052019047569159.0 ppb
2019-07-05201904757139.0 ppb
2019-07-052019047573114.0 ppb
2019-07-12201905107492.0 ppb
2019-07-12201905107650.0 ppb
2019-07-122019051078ND
2019-07-18201905274173.0 ppb
2019-07-18201905274341.0 ppb
2019-07-18201905274561.0 ppb
2019-07-192019051373149.0 ppb
2019-07-192019051375151.0 ppb
2019-07-192019051377130.0 ppb
2019-07-262019053468ND
2019-07-262019053470ND
2019-07-262019053472ND
2019-10-01201907413178.0 ppb
2019-10-01201907413334.0 ppb
2019-10-012019074135ND
2019-10-04201907293427.0 ppb
2019-10-04201907293658.0 ppb
2019-10-04201907293846.0 ppb
2019-10-11201907577372.0 ppb
2019-10-11201907577542.0 ppb
2019-10-11201907577745.0 ppb
2019-10-18201907473821.0 ppb
2019-10-18201907474021.0 ppb
2019-10-182019074773627.0 ppb
2019-10-25201907858287.0 ppb
2019-10-252019078584481.0 ppb
2019-10-252019078586212.0 ppb