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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

North Texas Municipal Water District Tawakoni 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

 

210

Samples

0

Samples exceeding legal limit (MCL)

35

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201414.7 ppb303ND - 165.0 ppb
2015ND360ND
20162.78 ppb362ND - 80.0 ppb
20173.06 ppb362ND - 90.0 ppb
2018114.0 ppb3617ND - 429.0 ppb
2019105.4 ppb3616ND - 447.0 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
2014-03-19Q1408864001ND
2014-03-19Q1408864002ND
2014-03-19Q1408864003ND
2014-04-16Q1412126001ND
2014-04-16Q1412126002ND
2014-04-16Q1412126003ND
2014-05-13Q1415775001ND
2014-05-13Q1415775002ND
2014-05-13Q1415755003ND
2014-06-10Q1420357001ND
2014-06-10Q1420357002ND
2014-06-10Q1420357003ND
2014-07-21Q1429947002ND
2014-07-21Q1429947001ND
2014-07-21Q1429947003ND
2014-08-12Q1435620002165.0 ppb
2014-08-12Q1435620001155.0 ppb
2014-08-12Q1435620003120.0 ppb
2014-09-08Q1442863003ND
2014-09-08Q1442863001ND
2014-09-08Q1442863002ND
2014-10-13Q1452362003ND
2014-10-13Q1452362001ND
2014-10-13Q1452362002ND
2014-11-10Q1455572001ND
2014-11-10Q1455572002ND
2014-11-10Q1455572003ND
2014-12-08Q1459247001ND
2014-12-08Q1459247002ND
2014-12-08Q1459247003ND
2015-01-12Q1500581002ND
2015-01-12Q1500581003ND
2015-01-12Q1500581001ND
2015-02-09Q1505288003ND
2015-02-09Q1505288001ND
2015-02-09Q1505288002ND
2015-03-09Q1509340002ND
2015-03-09Q1509340003ND
2015-03-09Q1509340001ND
2015-04-13Q1513894002ND
2015-04-13Q1513894001ND
2015-04-13Q1513894003ND
2015-05-11Q1517373001ND
2015-05-11Q1517373002ND
2015-05-11Q1517373003ND
2015-06-08Q1521156002ND
2015-06-08Q1521156001ND
2015-06-08Q1521156003ND
2015-07-13Q1527028002ND
2015-07-13Q1527028001ND
2015-07-13Q1527028003ND
2015-08-10Q1531727001ND
2015-08-10Q1531727002ND
2015-08-10Q1531727003ND
2015-09-07Q1534668001ND
2015-09-07Q1534668002ND
2015-09-07Q1534668003ND
2015-10-12Q1540183001ND
2015-10-12Q1540183002ND
2015-10-12Q1540183003ND
2015-11-09Q1544328002ND
2015-11-09Q1544328001ND
2015-11-09Q1544328003ND
2015-12-14Q1549990001ND
2015-12-14Q1549990002ND
2015-12-14Q1549990003ND
2016-01-11Q1601053001ND
2016-01-11Q1601053002ND
2016-01-11Q1601053003ND
2016-02-08Q1605697001ND
2016-02-08Q1605697002ND
2016-02-08Q1605697003ND
2016-03-07Q1609817001ND
2016-03-07Q1609817002ND
2016-03-07Q1609817003ND
2016-04-11Q1614505001ND
2016-04-11Q1614505002ND
2016-04-11Q1614505003ND
2016-05-09Q1618494001ND
2016-05-09Q1618494002ND
2016-05-09Q1618494003ND
2016-06-13Q1624161002ND
2016-06-13Q1624161001ND
2016-06-13Q1624161003ND
2016-07-11Q1628307003ND
2016-07-11Q1628307002ND
2016-07-11Q1628307001ND
2016-08-08Q1633184001ND
2016-08-08Q1633184002ND
2016-08-08Q1633184003ND
2016-09-12Q163742500320.0 ppb
2016-09-12Q1637425002ND
2016-09-12Q163742500180.0 ppb
2016-10-10Q1643455001ND
2016-10-10Q1643455002ND
2016-10-10Q1643455003ND
2016-11-14Q1649798001ND
2016-11-14Q1649798002ND
2016-11-14Q1649798003ND
2016-12-12Q1654333001ND
2016-12-12Q1654333002ND
2016-12-12Q1654333003ND
2017-01-16Q1702199001ND
2017-01-16Q1702199002ND
2017-01-16Q1702199003ND
2017-02-13Q1706408003ND
2017-02-13Q1706408002ND
2017-02-13Q1706408001ND
2017-03-13Q1710670003ND
2017-03-13Q1710670002ND
2017-03-13Q1710670001ND
2017-04-10Q1714819002ND
2017-04-10Q1714819003ND
2017-04-10Q1714819001ND
2017-05-08Q1719135002ND
2017-05-08Q1719135001ND
2017-05-08Q1719135003ND
2017-06-12Q1724602001ND
2017-06-12Q1724602002ND
2017-06-12Q1724602003ND
2017-07-10Q1728255003ND
2017-07-10Q1728255002ND
2017-07-10Q1728255001ND
2017-08-07Q1733616002ND
2017-08-07Q1733616003ND
2017-08-07Q1733616001ND
2017-09-11Q1743086001ND
2017-09-11Q1743086002ND
2017-09-11Q1743086003ND
2017-10-09Q1751609003ND
2017-10-09Q1751609002ND
2017-10-09Q1751609001ND
2017-11-13Q1758519001ND
2017-11-13Q1758519003ND
2017-11-13Q1758519002ND
2017-12-11Q176541200220.0 ppb
2017-12-11Q176541200190.0 ppb
2017-12-11Q1765412003ND
2018-01-08Q1800926003210.0 ppb
2018-01-08Q1800926002336.0 ppb
2018-01-08Q1800926001386.0 ppb
2018-02-12Q1806108001250.0 ppb
2018-02-12Q1806108002258.0 ppb
2018-02-12Q1806108003186.0 ppb
2018-03-12Q1810336003ND
2018-03-12Q1810336002ND
2018-03-12Q1810336001ND
2018-04-09Q1814678001ND
2018-04-09Q1814678002ND
2018-04-09Q1814678003ND
2018-05-14Q1819892003ND
2018-05-14Q1819892002ND
2018-05-14Q1819892001ND
2018-06-11Q1823471001ND
2018-06-11Q1823471003ND
2018-06-11Q1823471002ND
2018-07-09Q1827121001137.0 ppb
2018-07-09Q182712100288.8 ppb
2018-07-09Q1827121003ND
2018-08-22Q1833839003ND
2018-08-22Q1833839002ND
2018-08-22Q1833839001ND
2018-09-10Q1836020001ND
2018-09-10Q1836020002ND
2018-09-10Q1836020003ND
2018-10-08Q1840199002125.0 ppb
2018-10-08Q184019900398.8 ppb
2018-10-08Q184019900175.6 ppb
2018-11-12Q1845545001429.0 ppb
2018-11-12Q1845545002385.0 ppb
2018-11-12Q1845545003372.0 ppb
2018-12-10Q1850977001185.0 ppb
2018-12-10Q1850977002257.0 ppb
2018-12-10Q1850977003326.0 ppb
2019-01-07Q1900898003315.0 ppb
2019-01-07Q1900898001340.0 ppb
2019-01-07Q1900898002344.0 ppb
2019-02-11Q1906452003269.0 ppb
2019-02-11Q1906452002317.0 ppb
2019-02-11Q1906452001305.0 ppb
2019-03-11Q1910425002411.0 ppb
2019-03-11Q191042500345.0 ppb
2019-03-11Q1910425001447.0 ppb
2019-04-15Q1915317003216.0 ppb
2019-04-15Q1915317001ND
2019-04-15Q1915317002ND
2019-05-13Q192510500127.4 ppb
2019-05-13Q1925105002ND
2019-05-13Q192510500348.4 ppb
2019-06-10Q1934346001ND
2019-06-10Q1934346002ND
2019-06-10Q1934346003ND
2019-07-15Q1945434002ND
2019-07-15Q1945434001ND
2019-07-15Q1945434003ND
2019-08-12Q1954640003ND
2019-08-12Q1954640002ND
2019-08-12Q1954640001ND
2019-09-09Q1963705002ND
2019-09-09Q1963705001ND
2019-09-09Q1963705003167.0 ppb
2019-10-07Q1970805002ND
2019-10-07Q1970805003ND
2019-10-07Q1970805001ND
2019-11-11Q1976395003156.0 ppb
2019-11-11Q1976395001174.0 ppb
2019-11-11Q1976395002211.0 ppb
2019-12-091950089-02ND
2019-12-091950089-04ND
2019-12-091950089-03ND