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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Greenwood

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

 

178

Samples

4

Samples exceeding legal limit (MCL)

70

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014159.6 ppb4027ND - 1,520.0 ppb
2015234.6 ppb3628ND - 1,650.0 ppb
2016136.4 ppb3632ND - 935.0 ppb
201747.3 ppb3626ND - 257.0 ppb
201865.3 ppb1813ND - 225.0 ppb
201937.9 ppb127ND - 124.0 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
2014-02-111404400191,520.0 ppb
2014-02-1114044001824.6 ppb
2014-02-11140440020168.0 ppb
2014-02-27140590013ND
2014-02-27140590012162.0 ppb
2014-02-27140590011ND
2014-03-06140660018332.0 ppb
2014-03-06140660017ND
2014-03-06140660019ND
2014-04-01140920007ND
2014-04-01140920008653.0 ppb
2014-04-0114092000920.1 ppb
2014-05-0614128002640.4 ppb
2014-05-0614128002436.5 ppb
2014-05-061412800251,300.0 ppb
2014-05-2214143001634.8 ppb
2014-05-22141430017278.0 ppb
2014-05-2214143001838.5 ppb
2014-06-04141560021395.0 ppb
2014-06-04141560015353.0 ppb
2014-06-0414156001428.5 ppb
2014-06-0414156001623.4 ppb
2014-07-0214184001522.2 ppb
2014-07-0214184001440.7 ppb
2014-07-0214184001337.7 ppb
2014-08-0414219001033.3 ppb
2014-08-04142190011ND
2014-08-04142190009ND
2014-09-02142470022ND
2014-09-02142470024ND
2014-09-0214247002331.6 ppb
2014-10-08Y142820034ND
2014-10-08Y142820036ND
2014-10-08Y14282003541.6 ppb
2014-11-03Y143100033ND
2014-11-03Y143100032645.0 ppb
2014-11-03Y143100031ND
2014-12-02Y14338004027.3 ppb
2014-12-02Y14338004169.4 ppb
2014-12-02Y14338004227.9 ppb
2015-01-06Y15008002935.0 ppb
2015-01-06Y150080030537.0 ppb
2015-01-06Y15008003163.6 ppb
2015-02-03Y15036003260.2 ppb
2015-02-03Y150360034ND
2015-02-03Y150360033408.0 ppb
2015-03-03Y15063000235.8 ppb
2015-03-03Y15063000433.8 ppb
2015-03-03Y150630003514.0 ppb
2015-04-07Y15099003432.0 ppb
2015-04-07Y15099003358.0 ppb
2015-04-07Y15099003231.9 ppb
2015-05-05Y151270004ND
2015-05-05Y151270002ND
2015-05-05Y151270003640.0 ppb
2015-06-02Y151550024ND
2015-06-02Y151550026ND
2015-06-02Y15155002584.3 ppb
2015-07-08Y151910004ND
2015-07-08Y151910006ND
2015-07-08Y151910005ND
2015-08-05Y152180052589.0 ppb
2015-08-05Y152180050104.0 ppb
2015-08-05Y1521800511,650.0 ppb
2015-09-02Y15246001055.1 ppb
2015-09-02Y152460011723.0 ppb
2015-09-02Y152460012101.0 ppb
2015-10-06Y15282003558.0 ppb
2015-10-06Y15282003352.5 ppb
2015-10-06Y1528200341,010.0 ppb
2015-11-04Y15310001570.5 ppb
2015-11-04Y15310001355.5 ppb
2015-11-04Y153100014936.0 ppb
2015-12-02Y15337003938.7 ppb
2015-12-02Y153370037415.0 ppb
2015-12-02Y15337003654.1 ppb
2016-01-05Y16008006325.5 ppb
2016-01-05Y160080064551.0 ppb
2016-01-05Y16008006522.0 ppb
2016-02-01Y16035000962.0 ppb
2016-02-01Y160350010585.0 ppb
2016-02-01Y160350011110.0 ppb
2016-03-01Y16063000266.2 ppb
2016-03-01Y160630003108.0 ppb
2016-03-01Y16063000488.7 ppb
2016-04-05Y16098002520.2 ppb
2016-04-05Y16098002657.4 ppb
2016-04-05Y160980027ND
2016-05-02Y161260002ND
2016-05-02Y16126000333.1 ppb
2016-05-02Y161260004ND
2016-06-06Y16161000521.2 ppb
2016-06-06Y16161000630.6 ppb
2016-06-06Y161610007110.0 ppb
2016-07-06Y16189002053.3 ppb
2016-07-06Y16189002130.1 ppb
2016-07-06Y16189002252.3 ppb
2016-08-01Y16221003231.2 ppb
2016-08-01Y162210033396.0 ppb
2016-08-01Y16221003427.1 ppb
2016-09-06Y16252001044.6 ppb
2016-09-06Y162520011420.0 ppb
2016-09-06Y16252001263.2 ppb
2016-10-04Y162800014ND
2016-10-04Y162800015935.0 ppb
2016-10-04Y16280001623.0 ppb
2016-11-01Y16309002692.2 ppb
2016-11-01Y163090027487.0 ppb
2016-11-01Y16309002897.7 ppb
2016-12-06Y16342002749.0 ppb
2016-12-06Y163420028196.0 ppb
2016-12-06Y16342002923.0 ppb
2017-01-04Y17005004241.6 ppb
2017-01-04Y17005004340.0 ppb
2017-01-04Y17005004435.3 ppb
2017-02-01Y17034001834.7 ppb
2017-02-01Y17034001921.6 ppb
2017-02-01Y17034002026.6 ppb
2017-03-08Y170670007ND
2017-03-08Y17067000849.0 ppb
2017-03-08Y170670009ND
2017-04-04Y170960037ND
2017-04-04Y170960038135.0 ppb
2017-04-04Y170960039ND
2017-05-01Y171240029ND
2017-05-01Y17124003037.8 ppb
2017-05-01Y171240031ND
2017-06-05Y171590133ND
2017-06-05Y17159013449.8 ppb
2017-06-05Y171590135ND
2017-07-03Y17187007527.0 ppb
2017-07-03Y171870076142.0 ppb
2017-07-03Y17187007728.7 ppb
2017-08-02Y17215005223.7 ppb
2017-08-02Y17215005382.3 ppb
2017-08-02Y17215005422.9 ppb
2017-09-05Y17250003021.3 ppb
2017-09-05Y172500031114.0 ppb
2017-09-05Y17250003222.9 ppb
2017-10-03Y17278001942.1 ppb
2017-10-03Y17278001730.6 ppb
2017-10-03Y172780018222.0 ppb
2017-11-07Y173130023ND
2017-11-07Y173130024138.0 ppb
2017-11-07Y173130025ND
2017-12-04Y17341000228.0 ppb
2017-12-04Y173410003257.0 ppb
2017-12-04Y17341000427.8 ppb
2018-01-02Y180040032ND
2018-01-02Y180040031225.0 ppb
2018-01-02Y180040030ND
2018-02-05Y180400019153.0 ppb
2018-02-05Y18040001738.8 ppb
2018-02-05Y18040001844.8 ppb
2018-03-05Y18067003170.3 ppb
2018-03-05Y180670032ND
2018-03-05Y18067003038.5 ppb
2018-04-02Y180950027ND
2018-04-02Y180950024ND
2018-04-02Y18095002649.9 ppb
2018-07-03Y181860057158.0 ppb
2018-07-03Y18186005622.7 ppb
2018-07-03Y18186005827.5 ppb
2018-10-02Y182780014106.0 ppb
2018-10-02Y182780013156.0 ppb
2018-10-02Y18278001284.3 ppb
2019-01-08Y190100034121.0 ppb
2019-01-08Y19010003552.8 ppb
2019-01-08Y19010003333.5 ppb
2019-04-04Y19095001172.6 ppb
2019-04-04Y19095001227.7 ppb
2019-04-04Y19095001022.7 ppb
2019-07-08Y191920053ND
2019-07-08Y191920052ND
2019-07-08Y191920054ND
2019-10-02Y192770015ND
2019-10-02Y192770016124.0 ppb
2019-10-02Y192770017ND