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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

City of Graham

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

 

193

Samples

0

Samples exceeding legal limit (MCL)

45

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014271.2 ppb3127ND - 620.0 ppb
20151.94 ppb362ND - 50.0 ppb
201663.1 ppb3615ND - 580.0 ppb
201723.0 ppb3619ND - 120.0 ppb
201828.3 ppb3615ND - 440.0 ppb
2019ND180ND

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
2014-01-22238143480.0 ppb
2014-01-22238141620.0 ppb
2014-01-22238142480.0 ppb
2014-02-13238817390.0 ppb
2014-02-13238818360.0 ppb
2014-03-24240257440.0 ppb
2014-03-24240259420.0 ppb
2014-03-24240258400.0 ppb
2014-04-21241221290.0 ppb
2014-04-21241222310.0 ppb
2014-04-21241220440.0 ppb
2014-05-22242506180.0 ppb
2014-05-22242504430.0 ppb
2014-05-22242505290.0 ppb
2014-06-17243399160.0 ppb
2014-06-17243400150.0 ppb
2014-06-17243398310.0 ppb
2014-07-14244267270.0 ppb
2014-07-14244268120.0 ppb
2014-07-14244269140.0 ppb
2014-08-1824541848.0 ppb
2014-08-18245417ND
2014-10-16247548ND
2014-10-16247549ND
2014-10-16247547ND
2014-11-20248692310.0 ppb
2014-11-20248693150.0 ppb
2014-11-20248694120.0 ppb
2014-12-03249004470.0 ppb
2014-12-03249006400.0 ppb
2014-12-03249005230.0 ppb
2015-01-14250157ND
2015-01-14250156ND
2015-01-14250158ND
2015-02-11251817ND
2015-02-11251415ND
2015-02-11251818ND
2015-03-1125229450.0 ppb
2015-03-11252296ND
2015-03-11252295ND
2015-04-20253696ND
2015-04-20253695ND
2015-04-20253697ND
2015-05-06254288ND
2015-05-06254287ND
2015-05-06254286ND
2015-06-03255198ND
2015-06-03255197ND
2015-06-03255196ND
2015-07-07256356ND
2015-07-07256355ND
2015-07-07256354ND
2015-08-05257304ND
2015-08-05257305ND
2015-08-05257303ND
2015-09-02258275ND
2015-09-02258273ND
2015-09-0225827420.0 ppb
2015-10-05259279ND
2015-10-05259278ND
2015-10-05259280ND
2015-11-19260994ND
2015-11-19260996ND
2015-11-19260995ND
2015-12-02261391ND
2015-12-02261393ND
2015-12-02261392ND
2016-01-06262329ND
2016-01-06262331ND
2016-01-06262330ND
2016-02-03263241ND
2016-02-03263240ND
2016-02-03263239ND
2016-03-03264150580.0 ppb
2016-03-03264151410.0 ppb
2016-03-03264152360.0 ppb
2016-04-06265231ND
2016-04-06265228ND
2016-04-06265230ND
2016-05-09266300ND
2016-05-09266301ND
2016-05-09266302ND
2016-06-01267056ND
2016-06-01267058ND
2016-06-01267057ND
2016-07-0626822820.0 ppb
2016-07-06268229ND
2016-07-0626823020.0 ppb
2016-08-01269111110.0 ppb
2016-08-01269112110.0 ppb
2016-08-01269110170.0 ppb
2016-09-06270209ND
2016-09-06270208ND
2016-09-0627020780.0 ppb
2016-10-2627211060.0 ppb
2016-10-26272108100.0 ppb
2016-10-2627210930.0 ppb
2016-11-0327232680.0 ppb
2016-11-03272328ND
2016-11-0327232730.0 ppb
2016-12-07273512ND
2016-12-07273510110.0 ppb
2016-12-07273511ND
2017-01-0427426590.0 ppb
2017-01-0427426640.0 ppb
2017-01-04274267ND
2017-02-07275389ND
2017-02-07275388ND
2017-02-07275387120.0 ppb
2017-03-02276274ND
2017-03-02276273ND
2017-03-02276275ND
2017-04-05277285ND
2017-04-05277386ND
2017-04-0527728440.0 ppb
2017-05-0327824820.0 ppb
2017-05-03278249ND
2017-05-03278250ND
2017-06-0727965930.0 ppb
2017-06-0727965750.0 ppb
2017-06-07279658ND
2017-07-05280668ND
2017-07-0528066620.0 ppb
2017-07-05280667ND
2017-08-02281650ND
2017-08-02281652ND
2017-08-0228165150.0 ppb
2017-09-0628282030.0 ppb
2017-09-0628281950.0 ppb
2017-09-0628282130.0 ppb
2017-10-05283696ND
2017-10-05283697ND
2017-10-0528369822.0 ppb
2017-11-0128441171.0 ppb
2017-11-0128441325.0 ppb
2017-11-0128441243.0 ppb
2017-12-0628536723.0 ppb
2017-12-0628536643.0 ppb
2017-12-0628536830.0 ppb
2018-01-03286022ND
2018-01-0328602333.0 ppb
2018-01-0328602424.0 ppb
2018-02-07286894ND
2018-02-07286893ND
2018-02-07286895ND
2018-03-07287711ND
2018-03-07287710ND
2018-03-0728770963.0 ppb
2018-04-04288517ND
2018-04-04288516ND
2018-04-04288515ND
2018-05-02180503-09-02ND
2018-05-02180503.09-03ND
2018-05-02180503.09-01ND
2018-06-0629022425.0 ppb
2018-06-0629022241.0 ppb
2018-06-06290223ND
2018-07-0929121850.0 ppb
2018-07-0929122050.0 ppb
2018-07-0929121925.0 ppb
2018-08-01291889440.0 ppb
2018-08-0129189122.0 ppb
2018-08-01291890ND
2018-09-0529295387.0 ppb
2018-09-05292954ND
2018-09-0529295522.0 ppb
2018-10-09294074ND
2018-10-09294075ND
2018-10-09294073ND
2018-11-07294936ND
2018-11-07294935ND
2018-11-0729493457.0 ppb
2018-12-20296301ND
2018-12-2029630054.0 ppb
2018-12-2029630227.0 ppb
2019-01-02296459ND
2019-01-02296460ND
2019-01-02296461ND
2019-02-20298006ND
2019-02-20298007ND
2019-02-20298005ND
2019-03-06298367ND
2019-03-06298368ND
2019-03-06298366ND
2019-04-03190404.04-03ND
2019-04-03190404.04-02ND
2019-04-03190404.04-01ND
2019-05-15190516.09-01ND
2019-05-15190516.09-03ND
2019-05-15190516.09-02ND
2019-06-19190620.02-02ND
2019-06-19190620.02-03ND
2019-06-19190620.02-01ND