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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

East Rio Hondo WSC

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

 

234

Samples

1

Samples exceeding legal limit (MCL)

217

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014608.9 ppb3633ND - 1,040.0 ppb
2015520.7 ppb4237ND - 880.0 ppb
2016560.3 ppb3636170.0 ppb - 930.0 ppb
2017441.7 ppb3630ND - 850.0 ppb
2018547.5 ppb4847ND - 990.0 ppb
2019519.7 ppb363640.0 ppb - 800.0 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
2014-01-21ERHWSC-510-01-03487.0 ppb
2014-01-21ERHWSC-510-01-01692.0 ppb
2014-01-21ERHWSC-510-01-02665.0 ppb
2014-02-05ERHWSC-510-IC-01818.0 ppb
2014-02-05ERHWSC-510-IC-01187.0 ppb
2014-02-05ERHWSC-510-IC-01795.0 ppb
2014-03-11239816620.0 ppb
2014-03-11239817700.0 ppb
2014-03-11239815740.0 ppb
2014-04-10240988670.0 ppb
2014-04-10240990580.0 ppb
2014-04-10240989670.0 ppb
2014-05-081303485449.0 ppb
2014-05-081303486201.0 ppb
2014-05-081303487ND
2014-06-12243381310.0 ppb
2014-06-12243382290.0 ppb
2014-06-12243383310.0 ppb
2014-07-10244272ND
2014-07-1024427086.0 ppb
2014-07-10244271ND
2014-08-07245170880.0 ppb
2014-08-07245171870.0 ppb
2014-08-07245172810.0 ppb
2014-09-11371595830.0 ppb
2014-09-113715931,040.0 ppb
2014-09-11371594930.0 ppb
2014-10-09374247810.0 ppb
2014-10-09374248720.0 ppb
2014-10-09374249680.0 ppb
2014-11-20378630990.0 ppb
2014-11-20378632740.0 ppb
2014-11-20378631790.0 ppb
2014-12-24381980910.0 ppb
2014-12-24381982810.0 ppb
2014-12-24381981840.0 ppb
2015-01-22384530700.0 ppb
2015-01-22384528850.0 ppb
2015-01-22384529730.0 ppb
2015-02-12386671700.0 ppb
2015-02-12386670710.0 ppb
2015-02-12386669780.0 ppb
2015-03-12389237740.0 ppb
2015-03-12389239560.0 ppb
2015-03-12389238550.0 ppb
2015-04-17392750610.0 ppb
2015-04-17392748580.0 ppb
2015-04-17392749660.0 ppb
2015-05-22394171710.0 ppb
2015-05-22396172680.0 ppb
2015-05-22396173520.0 ppb
2015-06-04397589480.0 ppb
2015-06-04397590320.0 ppb
2015-06-04397588560.0 ppb
2015-07-09401170850.0 ppb
2015-07-09401171880.0 ppb
2015-07-09401169710.0 ppb
2015-08-07404001760.0 ppb
2015-08-07404000760.0 ppb
2015-08-07404002590.0 ppb
2015-09-11407642540.0 ppb
2015-09-11407643600.0 ppb
2015-09-11407644470.0 ppb
2015-10-06409927ND
2015-10-06409928510.0 ppb
2015-10-06409926ND
2015-10-16411383ND
2015-10-16411381ND
2015-10-16411382ND
2015-11-18414615260.0 ppb
2015-11-18414614460.0 ppb
2015-11-18414616190.0 ppb
2015-11-25415605200.0 ppb
2015-11-25415603570.0 ppb
2015-11-25415604450.0 ppb
2015-12-10417290310.0 ppb
2015-12-10417289460.0 ppb
2015-12-10417288860.0 ppb
2016-01-15420633860.0 ppb
2016-01-15420634530.0 ppb
2016-01-15420635450.0 ppb
2016-02-05422727760.0 ppb
2016-02-05422728760.0 ppb
2016-02-05422729650.0 ppb
2016-03-18427027930.0 ppb
2016-03-18427028600.0 ppb
2016-03-18427029830.0 ppb
2016-04-14429994580.0 ppb
2016-04-14429993770.0 ppb
2016-04-14429995620.0 ppb
2016-05-13432917750.0 ppb
2016-05-13432918600.0 ppb
2016-05-13432919480.0 ppb
2016-06-10435806200.0 ppb
2016-06-10435805590.0 ppb
2016-06-10435807390.0 ppb
2016-07-22440183420.0 ppb
2016-07-22440182490.0 ppb
2016-07-22440181570.0 ppb
2016-08-19443175340.0 ppb
2016-08-19443174570.0 ppb
2016-08-19443173570.0 ppb
2016-09-16446232400.0 ppb
2016-09-16446233340.0 ppb
2016-09-16446234170.0 ppb
2016-10-14449148510.0 ppb
2016-10-14449149350.0 ppb
2016-10-14449150280.0 ppb
2016-11-18452637460.0 ppb
2016-11-18452636660.0 ppb
2016-11-18452638650.0 ppb
2016-12-22455818640.0 ppb
2016-12-22455817790.0 ppb
2016-12-22455819610.0 ppb
2017-01-12457728780.0 ppb
2017-01-12457729580.0 ppb
2017-01-12457730660.0 ppb
2017-02-09460561740.0 ppb
2017-02-09460562460.0 ppb
2017-02-09460563730.0 ppb
2017-03-16464347320.0 ppb
2017-03-16464346730.0 ppb
2017-03-16464348500.0 ppb
2017-04-20467970520.0 ppb
2017-04-20467969850.0 ppb
2017-04-20467971650.0 ppb
2017-05-11470290670.0 ppb
2017-05-11470288700.0 ppb
2017-05-11470289460.0 ppb
2017-06-22474926550.0 ppb
2017-06-22474924670.0 ppb
2017-06-22474925380.0 ppb
2017-07-21478217260.0 ppb
2017-07-21478216560.0 ppb
2017-07-21478218530.0 ppb
2017-08-24482585530.0 ppb
2017-08-24482586110.0 ppb
2017-08-2448258740.0 ppb
2017-09-21486076230.0 ppb
2017-09-21486077590.0 ppb
2017-09-21486075250.0 ppb
2017-10-19489430ND
2017-10-19489429ND
2017-10-19489428ND
2017-11-16492565ND
2017-11-16492566ND
2017-11-16492567ND
2017-12-14495513850.0 ppb
2017-12-14495512220.0 ppb
2017-12-14495514780.0 ppb
2018-01-11498293510.0 ppb
2018-01-11498295790.0 ppb
2018-01-11498294440.0 ppb
2018-01-11498300770.0 ppb
2018-01-11498299480.0 ppb
2018-01-11498298820.0 ppb
2018-02-08501239240.0 ppb
2018-02-08501240640.0 ppb
2018-02-08501238800.0 ppb
2018-02-15501993760.0 ppb
2018-02-15501991640.0 ppb
2018-02-15501992170.0 ppb
2018-03-15505238260.0 ppb
2018-03-15505237750.0 ppb
2018-03-15505233260.0 ppb
2018-03-15505234740.0 ppb
2018-03-15505232720.0 ppb
2018-03-15505239760.0 ppb
2018-04-12508211450.0 ppb
2018-04-12508212270.0 ppb
2018-04-12508210450.0 ppb
2018-05-03510487510.0 ppb
2018-05-03510486610.0 ppb
2018-05-03510485770.0 ppb
2018-06-21515993310.0 ppb
2018-06-21515992160.0 ppb
2018-06-21515986640.0 ppb
2018-06-21515987830.0 ppb
2018-06-21515991900.0 ppb
2018-06-21515988540.0 ppb
2018-07-12518400590.0 ppb
2018-07-12518401600.0 ppb
2018-07-12518399760.0 ppb
2018-08-09521501ND
2018-08-0952150060.0 ppb
2018-08-0952149960.0 ppb
2018-09-13525335610.0 ppb
2018-09-13525336380.0 ppb
2018-09-13525337240.0 ppb
2018-10-25530454520.0 ppb
2018-10-25530455600.0 ppb
2018-10-25530453730.0 ppb
2018-11-08532107990.0 ppb
2018-11-08532108890.0 ppb
2018-11-08532109540.0 ppb
2018-12-06535912650.0 ppb
2018-12-06535913570.0 ppb
2018-12-06535914500.0 ppb
2019-01-10539179430.0 ppb
2019-01-10539177640.0 ppb
2019-01-10539178550.0 ppb
2019-02-07542307780.0 ppb
2019-02-07542306630.0 ppb
2019-02-07542305670.0 ppb
2019-03-14547438100.0 ppb
2019-03-14547439360.0 ppb
2019-03-1454743790.0 ppb
2019-04-18550596310.0 ppb
2019-04-18550594500.0 ppb
2019-04-18550595380.0 ppb
2019-05-09552966750.0 ppb
2019-05-09552967520.0 ppb
2019-05-09552968460.0 ppb
2019-06-06556176610.0 ppb
2019-06-06556177620.0 ppb
2019-06-06556178660.0 ppb
2019-07-11560515580.0 ppb
2019-07-11560514650.0 ppb
2019-07-11560516340.0 ppb
2019-08-15564783620.0 ppb
2019-08-15564782590.0 ppb
2019-08-15564781710.0 ppb
2019-09-05567251470.0 ppb
2019-09-05567250570.0 ppb
2019-09-05567252560.0 ppb
2019-10-1057191840.0 ppb
2019-10-10571916490.0 ppb
2019-10-10571917270.0 ppb
2019-11-14576071650.0 ppb
2019-11-14576070640.0 ppb
2019-11-14576069800.0 ppb
2019-12-12579460540.0 ppb
2019-12-12579459560.0 ppb
2019-12-12579461570.0 ppb