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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Hope Water Light Comm.

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

 

72

Samples

0

Samples exceeding legal limit (MCL)

33

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014138.9 ppb127ND - 306.0 ppb
201544.8 ppb122ND - 274.0 ppb
2016200.8 ppb127ND - 625.0 ppb
201788.8 ppb125ND - 340.0 ppb
2018155.3 ppb128ND - 508.0 ppb
2019109.0 ppb125ND - 508.0 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
2014-03-11140720046198.0 ppb
2014-03-11140720047306.0 ppb
2014-03-11140720048203.0 ppb
2014-06-03141560010252.0 ppb
2014-06-03141560009ND
2014-06-03141560011275.0 ppb
2014-09-02142470009ND
2014-09-02142470012ND
2014-09-02142470010285.0 ppb
2014-12-03Y143380011148.0 ppb
2014-12-03Y143380013ND
2014-12-03Y143380010ND
2015-03-02Y150650001ND
2015-03-02Y150650003ND
2015-03-02Y150650002ND
2015-06-01Y151550009ND
2015-06-01Y151550007ND
2015-06-01Y151550008274.0 ppb
2015-09-01Y152460003ND
2015-09-01Y152460002ND
2015-09-01Y152460001ND
2015-12-02Y153370031264.0 ppb
2015-12-02Y153370030ND
2015-12-02Y153370032ND
2016-03-02Y160640003ND
2016-03-02Y160640004414.0 ppb
2016-03-02Y160640005ND
2016-06-08Y161610003526.0 ppb
2016-06-08Y161610002202.0 ppb
2016-06-08Y161610014294.0 ppb
2016-09-07Y162520004ND
2016-09-07Y162520005ND
2016-09-07Y162520017ND
2016-12-06Y163420041625.0 ppb
2016-12-06Y163420042159.0 ppb
2016-12-06Y163420043190.0 ppb
2017-03-07Y170680001ND
2017-03-07Y170680006ND
2017-03-07Y170680002340.0 ppb
2017-06-06Y171590142194.0 ppb
2017-06-06Y17159012847.9 ppb
2017-06-06Y171590127ND
2017-09-05Y172500012ND
2017-09-05Y172500013ND
2017-09-05Y172500014291.0 ppb
2017-12-05Y173410011ND
2017-12-05Y173410012ND
2017-12-05Y173410016193.0 ppb
2018-03-06Y180670020ND
2018-03-06Y18067002878.7 ppb
2018-03-06Y18067002180.6 ppb
2018-06-06Y181570007508.0 ppb
2018-06-06Y18157000687.5 ppb
2018-06-06Y181570008305.0 ppb
2018-09-04Y182500018ND
2018-09-04Y182500020506.0 ppb
2018-09-04Y182500019131.0 ppb
2018-12-04Y183400038167.0 ppb
2018-12-04Y183400037ND
2018-12-04Y183400042ND
2019-03-05Y190660031123.0 ppb
2019-03-05Y190660027257.0 ppb
2019-03-05Y190660026ND
2019-06-04Y191570029340.0 ppb
2019-06-04Y191570030ND
2019-06-04Y191570031ND
2019-09-03Y192490018ND
2019-09-03Y192490017ND
2019-09-03Y192490019508.0 ppb
2019-12-03Y19339003980.1 ppb
2019-12-03Y193390037ND
2019-12-03Y193390038ND