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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Crwa Lake Dunlap Water Treatment Plant

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

 

214

Samples

0

Samples exceeding legal limit (MCL)

107

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014408.3 ppb3430ND - 810.0 ppb
2015350.3 ppb3627ND - 730.0 ppb
2016237.8 ppb3620ND - 710.0 ppb
2017307.9 ppb3630ND - 580.0 ppb
201856.7 ppb364ND - 867.0 ppb
20192.31 ppb362ND - 54.0 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
2014-01-14237696370.0 ppb
2014-01-14237694440.0 ppb
2014-01-14237693530.0 ppb
2014-01-14237695410.0 ppb
2014-02-18238867400.0 ppb
2014-02-18238868290.0 ppb
2014-02-18238866370.0 ppb
2014-02-18238865490.0 ppb
2014-03-17239877560.0 ppb
2014-03-17239879ND
2014-03-17239880400.0 ppb
2014-03-17239878490.0 ppb
2014-04-09240738400.0 ppb
2014-04-09240739390.0 ppb
2014-04-09240737450.0 ppb
2014-04-09240736530.0 ppb
2014-05-141303500299.0 ppb
2014-05-141303499ND
2014-05-141303498420.0 ppb
2014-05-141303497554.0 ppb
2014-06-02242679310.0 ppb
2014-06-02242678ND
2014-06-02242676470.0 ppb
2014-06-02242677340.0 ppb
2014-07-08243967510.0 ppb
2014-07-08243969ND
2014-07-08243970270.0 ppb
2014-07-08243968390.0 ppb
2014-11-10248129780.0 ppb
2014-11-10248130490.0 ppb
2014-11-10248131400.0 ppb
2014-12-09249157810.0 ppb
2014-12-09249158720.0 ppb
2014-12-09249159600.0 ppb
2015-01-19250206450.0 ppb
2015-01-19250207410.0 ppb
2015-01-19250208340.0 ppb
2015-02-09251239390.0 ppb
2015-02-09251237520.0 ppb
2015-02-09251238430.0 ppb
2015-03-11252292470.0 ppb
2015-03-11252291530.0 ppb
2015-03-11252293390.0 ppb
2015-04-06253045390.0 ppb
2015-04-06253044480.0 ppb
2015-04-06253046410.0 ppb
2015-05-20254696370.0 ppb
2015-05-20254694550.0 ppb
2015-05-20254695330.0 ppb
2015-06-05255313730.0 ppb
2015-06-05255314580.0 ppb
2015-06-08255315450.0 ppb
2015-07-13256530540.0 ppb
2015-07-13256528620.0 ppb
2015-07-13256529530.0 ppb
2015-08-11257526440.0 ppb
2015-08-11257527420.0 ppb
2015-08-11257525530.0 ppb
2015-09-09258451400.0 ppb
2015-09-09258450500.0 ppb
2015-09-09258452410.0 ppb
2015-10-14259620ND
2015-10-14259621ND
2015-10-14259622ND
2015-11-10260524ND
2015-11-10260525ND
2015-11-10260523ND
2015-12-09261581ND
2015-12-09261580ND
2015-12-09261579ND
2016-01-12262469ND
2016-01-12262470ND
2016-01-12262471ND
2016-02-09263354ND
2016-02-09263355ND
2016-02-09263356ND
2016-03-07264182ND
2016-03-07264183ND
2016-03-07264184ND
2016-04-04265003ND
2016-04-04265002ND
2016-04-042650004ND
2016-05-0926625520.0 ppb
2016-05-09266256ND
2016-05-09266257ND
2016-06-14267496ND
2016-06-1426749520.0 ppb
2016-06-14267497ND
2016-07-18268640490.0 ppb
2016-07-18268639660.0 ppb
2016-07-18268641480.0 ppb
2016-08-02269087650.0 ppb
2016-08-02269088500.0 ppb
2016-08-02269089480.0 ppb
2016-09-07270199450.0 ppb
2016-09-07270198540.0 ppb
2016-09-07270200440.0 ppb
2016-10-03271155410.0 ppb
2016-10-03271153710.0 ppb
2016-10-03281154430.0 ppb
2016-11-08272372490.0 ppb
2016-11-08272373350.0 ppb
2016-11-08272374340.0 ppb
2016-12-06273350480.0 ppb
2016-12-06273353330.0 ppb
2016-12-06273351290.0 ppb
2017-01-09274361360.0 ppb
2017-01-09274360390.0 ppb
2017-01-09274359540.0 ppb
2017-02-08275400580.0 ppb
2017-02-08275401540.0 ppb
2017-02-08275398570.0 ppb
2017-03-14276508380.0 ppb
2017-03-14276505550.0 ppb
2017-03-14276506380.0 ppb
2017-04-04277166340.0 ppb
2017-04-04277167340.0 ppb
2017-04-04277165410.0 ppb
2017-05-08278348320.0 ppb
2017-05-08278347320.0 ppb
2017-05-08278346460.0 ppb
2017-06-13279833440.0 ppb
2017-06-13279835340.0 ppb
2017-06-13279834340.0 ppb
2017-07-11280741530.0 ppb
2017-07-11280743350.0 ppb
2017-07-11280742360.0 ppb
2017-08-08281788390.0 ppb
2017-08-08281789260.0 ppb
2017-08-08281790240.0 ppb
2017-09-12282871380.0 ppb
2017-09-12282872330.0 ppb
2017-09-12282870550.0 ppb
2017-10-1728398640.0 ppb
2017-10-17283984ND
2017-10-1728398533.0 ppb
2017-11-07284574ND
2017-11-07284575ND
2017-11-07284576ND
2017-12-11285440ND
2017-12-11285441ND
2017-12-1128544223.0 ppb
2018-01-09286132ND
2018-01-09286134ND
2018-01-09286133ND
2018-02-12286966ND
2018-02-12286967ND
2018-02-12286965ND
2018-03-06287601ND
2018-03-0628759970.0 ppb
2018-03-06287600ND
2018-04-09288563ND
2018-04-09288564ND
2018-04-09288562ND
2018-05-08289407ND
2018-05-08289406ND
2018-05-08289404ND
2018-06-05290088ND
2018-06-05290087ND
2018-06-05290089ND
2018-07-11291299ND
2018-07-11291300ND
2018-07-11291301ND
2018-08-07292068ND
2018-08-07292067ND
2018-08-07292066ND
2018-09-14293304ND
2018-09-14293305ND
2018-09-14293306ND
2018-10-01293752ND
2018-10-01293753ND
2018-10-01293751ND
2018-11-05294743867.0 ppb
2018-11-05294744610.0 ppb
2018-11-05294745493.0 ppb
2018-12-06295799ND
2018-12-06295801ND
2018-12-06295802ND
2019-01-04296537ND
2019-01-04296535ND
2019-01-0429653654.0 ppb
2019-02-11297576ND
2019-02-11297575ND
2019-02-11297574ND
2019-03-04298205ND
2019-03-04298206ND
2019-03-04298204ND
2019-04-01190401.09-05ND
2019-04-01190401.09-03ND
2019-04-01190401.09-04ND
2019-05-02190502.22-05ND
2019-05-02190502.22-03ND
2019-05-02190502.22-04ND
2019-06-03190603.11-04ND
2019-06-03190603.11-03ND
2019-06-03190603.11-05ND
2019-07-08190708.09-05ND
2019-07-08190708.09-04ND
2019-07-08190708.09-03ND
2019-08-08190808.06-05ND
2019-08-08190808.06-04ND
2019-08-08190808.06-03ND
2019-09-03190903.06-04ND
2019-09-03190903.06-03ND
2019-09-03190903.06-05ND
2019-10-02191002.15-04ND
2019-10-02191002.15-05ND
2019-10-02191002.15-03ND
2019-11-04191104.19-05ND
2019-11-04191104.19-03ND
2019-11-04191104.19-04ND
2019-12-02191202.12-04ND
2019-12-02191202.12-0329.0 ppb
2019-12-02191202.12-05ND