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EWG's Tap Water Database — 2019 UPDATE

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Chlorite

City of Mesa

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.

 

151

Samples

0

Samples exceeding legal limit (MCL)

118

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201298.7 ppb4224ND - 400.0 ppb
2013267.2 ppb3332ND - 530.0 ppb
2014216.7 ppb1613ND - 400.0 ppb
2015223.7 ppb121283.0 ppb - 590.0 ppb
2016223.1 ppb242425.0 ppb - 464.0 ppb
2017239.7 ppb2421ND - 453.0 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
2012-01-10201201110257210.0 ppb
2012-01-10201201110258130.0 ppb
2012-01-10201201110259160.0 ppb
2012-01-10201201110260ND
2012-01-1020120111026122.0 ppb
2012-01-10201201110262180.0 ppb
2012-02-06201202070163ND
2012-02-0620120207016423.0 ppb
2012-02-06201202070165130.0 ppb
2012-03-05201203070314ND
2012-03-05201203070315ND
2012-03-05201203070316ND
2012-04-03201204040303ND
2012-04-03201204040304ND
2012-04-03201204040305ND
2012-05-15201205080128ND
2012-05-15201205080129ND
2012-05-15201205080130ND
2012-06-05201206060238ND
2012-06-05201206060239ND
2012-06-05201206060240ND
2012-07-091207029696.0 ppb
2012-07-0912070297237.0 ppb
2012-07-0912070298262.0 ppb
2012-08-131208043094.0 ppb
2012-08-1312080431230.0 ppb
2012-08-1312080432323.0 ppb
2012-09-1020120913047288.0 ppb
2012-09-10201209130473110.0 ppb
2012-09-10201209130474140.0 ppb
2012-10-02201210030090260.0 ppb
2012-10-02201210030091400.0 ppb
2012-10-02201210030092350.0 ppb
2012-10-09201210030087190.0 ppb
2012-10-09201210030088220.0 ppb
2012-10-09201210030089190.0 ppb
2012-11-01201211050216A56.0 ppb
2012-11-01201211050217A43.0 ppb
2012-11-01201211050218ND
2012-12-04201212060267ND
2012-12-04201212060268ND
2012-12-04201212060269ND
2013-01-07201301100153230.0 ppb
2013-01-07201301100154240.0 ppb
2013-01-07201301100155220.0 ppb
2013-01-07201301100157280.0 ppb
2013-01-07201301100158370.0 ppb
2013-01-07201301100159530.0 ppb
2013-02-12201302060077180.0 ppb
2013-02-12201302060078200.0 ppb
2013-02-12201302060079240.0 ppb
2013-03-08201303050110180.0 ppb
2013-03-08201303050111180.0 ppb
2013-03-08201303050112160.0 ppb
2013-04-02201304080215240.0 ppb
2013-04-02201304080216280.0 ppb
2013-04-02201304080217260.0 ppb
2013-04-02201304080219290.0 ppb
2013-04-02201304080220260.0 ppb
2013-04-02201304080221260.0 ppb
2013-05-06201305100026230.0 ppb
2013-05-06201305100027240.0 ppb
2013-05-0620130510002849.0 ppb
2013-07-0213060599270.0 ppb
2013-07-0213060600450.0 ppb
2013-07-0213060601490.0 ppb
2013-07-0213060604440.0 ppb
2013-07-0213060605450.0 ppb
2013-07-021306060680.0 ppb
2013-10-0113090771ND
2013-10-0113090772260.0 ppb
2013-10-0113090773260.0 ppb
2013-10-0113090774300.0 ppb
2013-10-0113090775360.0 ppb
2013-10-0113090776340.0 ppb
2014-04-0114030675360.0 ppb
2014-04-0114030676320.0 ppb
2014-04-0114030677330.0 ppb
2014-07-0114060833270.0 ppb
2014-07-0114060834370.0 ppb
2014-07-0114060835220.0 ppb
2014-07-0114060836ND
2014-07-0114060837ND
2014-07-0114060838ND
2014-08-121408033247.6 ppb
2014-10-0714100236380.0 ppb
2014-10-0714100237400.0 ppb
2014-10-0714100238400.0 ppb
2014-10-0714100239120.0 ppb
2014-10-0714100240110.0 ppb
2014-10-0714100241140.0 ppb
2015-02-0315020024200.0 ppb
2015-02-0315020025210.0 ppb
2015-02-0315020026210.0 ppb
2015-02-031502002890.0 ppb
2015-02-0315020029590.0 ppb
2015-02-1215020027100.0 ppb
2015-10-0715100056246.0 ppb
2015-10-0715100057390.0 ppb
2015-10-0715100058305.0 ppb
2015-10-071510005983.0 ppb
2015-10-0715100060137.0 ppb
2015-10-0715100061123.0 ppb
2016-01-0616010070204.0 ppb
2016-01-0616010071244.0 ppb
2016-01-0616010072206.0 ppb
2016-01-061601007325.0 ppb
2016-01-061601007427.0 ppb
2016-01-0616010075213.0 ppb
2016-04-0516040015183.0 ppb
2016-04-0516040016205.0 ppb
2016-04-0516040017197.0 ppb
2016-04-0516040018289.0 ppb
2016-04-0516040019285.0 ppb
2016-04-0516040020434.0 ppb
2016-07-1416070468180.0 ppb
2016-07-1416070469307.0 ppb
2016-07-1416070470158.0 ppb
2016-07-141607047130.0 ppb
2016-07-1416070472105.0 ppb
2016-07-1416070473188.0 ppb
2016-10-0516100345288.0 ppb
2016-10-0516100346305.0 ppb
2016-10-0516100347316.0 ppb
2016-10-0516100348104.0 ppb
2016-10-0516100349398.0 ppb
2016-10-0516100350464.0 ppb
2017-01-0417010256217.0 ppb
2017-01-0417010257235.0 ppb
2017-01-0417010258181.0 ppb
2017-01-0417010259ND
2017-01-0417010260ND
2017-01-0417010261ND
2017-04-0617040272170.0 ppb
2017-04-0617040273217.0 ppb
2017-04-0617040274210.0 ppb
2017-04-0617040275439.0 ppb
2017-04-0617040276431.0 ppb
2017-04-0617040277453.0 ppb
2017-07-1217070298231.0 ppb
2017-07-1217070299351.0 ppb
2017-07-1217070300222.0 ppb
2017-07-1717070301298.0 ppb
2017-07-1717070302329.0 ppb
2017-07-1717070303329.0 ppb
2017-10-0417100297197.0 ppb
2017-10-0417100298280.0 ppb
2017-10-0417100299251.0 ppb
2017-10-0517100300251.0 ppb
2017-10-0517100301260.0 ppb
2017-10-0517100302200.0 ppb