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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Central Texas Water Supply Corporation

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

 

150

Samples

0

Samples exceeding legal limit (MCL)

121

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014177.9 ppb128ND - 630.0 ppb
2015138.5 ppb2413ND - 470.0 ppb
2016465.4 ppb3633ND - 850.0 ppb
2017209.2 ppb2114ND - 560.0 ppb
2018305.7 ppb2423ND - 521.0 ppb
2019333.5 ppb3332ND - 743.0 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
2014-02-0614-0212-15210.0 ppb
2014-02-0614-0212-14230.0 ppb
2014-02-0614-0212-13190.0 ppb
2014-06-0514-0610-9240.0 ppb
2014-06-0514-0610-8130.0 ppb
2014-06-0514-0610-7270.0 ppb
2014-08-19Q1437584002ND
2014-08-19Q1437584001630.0 ppb
2014-09-09Q1442364001ND
2014-09-09Q1442364002ND
2014-10-02Q1450179005235.0 ppb
2014-10-02Q1450179006ND
2015-03-1115-0316-4470.0 ppb
2015-03-1115-0316-6ND
2015-03-1115-0316-5ND
2015-05-28Q1519444003295.0 ppb
2015-05-28Q1519444002165.0 ppb
2015-05-28Q1519444001315.0 ppb
2015-06-04Q1520047006365.0 ppb
2015-06-04Q1520047007365.0 ppb
2015-06-04Q1520047005380.0 ppb
2015-07-06Q1525153005ND
2015-07-06Q1525153006ND
2015-07-06Q1525153004110.0 ppb
2015-08-05Q1530388006ND
2015-08-05Q153038800535.0 ppb
2015-08-05Q1530388007ND
2015-09-02Q1533632003ND
2015-09-02Q1533632001ND
2015-09-02Q1533632002ND
2015-10-07Q153915200325.0 ppb
2015-10-07Q1539152001ND
2015-10-07Q1539152002ND
2015-11-03Q1542815001350.0 ppb
2015-11-03Q1542815003210.0 ppb
2015-11-03Q1542815002240.0 ppb
2016-03-08Q1609485003340.0 ppb
2016-03-08Q1609485001365.0 ppb
2016-03-08Q1609485002220.0 ppb
2016-04-05Q1613169002615.0 ppb
2016-04-05Q1613169003590.0 ppb
2016-04-05Q1613169001790.0 ppb
2016-05-04Q1617348003ND
2016-05-04Q1617348002ND
2016-05-04Q1617348001ND
2016-06-29Q1626153002245.0 ppb
2016-06-29Q1626153001305.0 ppb
2016-06-29Q1626153003185.0 ppb
2016-07-08Q1627527003650.0 ppb
2016-07-08Q1627527002755.0 ppb
2016-07-08Q1627527001665.0 ppb
2016-07-14Q1628593002680.0 ppb
2016-07-14Q1628593003690.0 ppb
2016-07-14Q1628593001850.0 ppb
2016-08-17Q1633849004580.0 ppb
2016-08-17Q1633849003585.0 ppb
2016-08-17Q1633849002640.0 ppb
2016-08-24Q1634314003445.0 ppb
2016-08-24Q1634314002435.0 ppb
2016-08-24Q1634314001625.0 ppb
2016-09-14Q1637446003500.0 ppb
2016-09-14Q1637446002475.0 ppb
2016-09-14Q1637446001580.0 ppb
2016-09-21Q1638891003570.0 ppb
2016-09-21Q1638891002450.0 ppb
2016-09-21Q1638891001665.0 ppb
2016-10-06Q1642290003460.0 ppb
2016-10-06Q1642290002455.0 ppb
2016-10-06Q1642290001530.0 ppb
2016-11-30Q1651885003175.0 ppb
2016-11-30Q1651885002320.0 ppb
2016-11-30Q1651885001320.0 ppb
2017-02-07Q1704918002ND
2017-02-07Q1704918003560.0 ppb
2017-02-07Q1704918001470.0 ppb
2017-03-20Q1711687002ND
2017-03-20Q1711687001ND
2017-03-20Q1711687003ND
2017-04-17Q1715417001ND
2017-04-17Q1715417002ND
2017-04-17Q1715417003ND
2017-06-28Q1726664001408.0 ppb
2017-06-28Q1726664002424.0 ppb
2017-06-28Q1726664003390.0 ppb
2017-07-11Q172791002220.0 ppb
2017-07-11Q172791001496.0 ppb
2017-07-11Q172791003258.0 ppb
2017-08-02Q1731908006104.0 ppb
2017-08-02Q1731908005238.0 ppb
2017-08-02Q1731908007114.0 ppb
2017-09-06Q1741074003242.0 ppb
2017-09-06Q17410074002256.0 ppb
2017-09-06Q1741074001214.0 ppb
2018-05-09Q1818637003154.0 ppb
2018-05-09Q1818637002190.0 ppb
2018-05-09Q1818637001289.0 ppb
2018-06-06Q1822367001521.0 ppb
2018-06-06Q1822367002491.0 ppb
2018-06-06Q1822367003500.0 ppb
2018-07-05Q1826441004186.0 ppb
2018-07-05Q1826441001264.0 ppb
2018-07-05Q1826441003232.0 ppb
2018-08-06Q1830904006371.0 ppb
2018-08-06Q1830904007ND
2018-08-06Q1830904005341.0 ppb
2018-09-06Q1835467005238.0 ppb
2018-09-06Q1835467006147.0 ppb
2018-09-06Q183546700762.0 ppb
2018-10-02Q1839000007210.0 ppb
2018-10-02Q1839000005336.0 ppb
2018-10-02Q1839000006175.0 ppb
2018-11-07Q1844441007404.0 ppb
2018-11-07Q1844441006459.0 ppb
2018-11-07Q1844441005492.0 ppb
2018-12-12Q1850982003360.0 ppb
2018-12-12Q1850982002427.0 ppb
2018-12-12Q1850982001487.0 ppb
2019-01-10Q1901223003604.0 ppb
2019-01-10Q1901223002581.0 ppb
2019-01-10Q1901223001641.0 ppb
2019-02-19Q1907179003451.0 ppb
2019-02-19Q1907179001533.0 ppb
2019-02-19Q1907179002513.0 ppb
2019-03-05Q1909126005743.0 ppb
2019-03-05Q1909126006648.0 ppb
2019-03-05Q1909126007519.0 ppb
2019-04-11Q1914636001521.0 ppb
2019-04-11Q1914636002459.0 ppb
2019-04-11Q1914636003467.0 ppb
2019-04-21Q1915895003411.0 ppb
2019-04-21Q1915895002440.0 ppb
2019-04-21Q1915895001ND
2019-05-16Q1925900001309.0 ppb
2019-05-16Q1925900003303.0 ppb
2019-05-16Q1925900002295.0 ppb
2019-06-1019-0613-17235.0 ppb
2019-06-1019-0613-16329.0 ppb
2019-06-1019-0613-18199.0 ppb
2019-07-0919-0712-23118.0 ppb
2019-07-0919-0712-2262.0 ppb
2019-07-0919-0712-2169.0 ppb
2019-08-0619-0809-57192.0 ppb
2019-08-0619-0809-59126.0 ppb
2019-08-0619-0809-58126.0 ppb
2019-09-0519-0909-867.0 ppb
2019-09-0519-0909-794.0 ppb
2019-09-0519-0909-6125.0 ppb
2019-10-0119-1004-10287.0 ppb
2019-10-0119-1004-11275.0 ppb
2019-10-0119-1004-12262.0 ppb