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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Parker WSD

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

 

138

Samples

0

Samples exceeding legal limit (MCL)

57

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2013N/A00N/A
2014N/A00N/A
2015ND60ND
20168.83 ppb306ND - 143.0 ppb
201759.8 ppb3013ND - 350.0 ppb
201885.3 ppb3624ND - 299.0 ppb
2019109.6 ppb3628ND - 342.0 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 Result
2015-08-19ND
2015-08-19ND
2015-08-19ND
2015-10-22ND
2015-10-22ND
2015-10-22ND
2016-04-28ND
2016-04-2871.0 ppb
2016-04-28ND
2016-05-1715.0 ppb
2016-05-17ND
2016-05-17ND
2016-05-27ND
2016-05-27ND
2016-05-2711.0 ppb
2016-06-24ND
2016-06-24ND
2016-06-24ND
2016-07-29ND
2016-07-29ND
2016-07-29ND
2016-08-22ND
2016-08-22143.0 ppb
2016-08-22ND
2016-09-06ND
2016-09-06ND
2016-09-06ND
2016-09-2913.0 ppb
2016-09-2912.0 ppb
2016-09-29ND
2016-10-17ND
2016-10-17ND
2016-10-17ND
2016-12-30ND
2016-12-30ND
2016-12-30ND
2017-03-2827.0 ppb
2017-03-28124.0 ppb
2017-03-28ND
2017-04-13ND
2017-04-13ND
2017-04-13ND
2017-05-19ND
2017-05-19ND
2017-05-19ND
2017-06-09ND
2017-06-09ND
2017-06-09ND
2017-07-1276.0 ppb
2017-07-12314.0 ppb
2017-07-12ND
2017-08-16ND
2017-08-16196.0 ppb
2017-08-16ND
2017-09-25ND
2017-09-2523.0 ppb
2017-09-25ND
2017-10-1058.0 ppb
2017-10-10350.0 ppb
2017-10-10ND
2017-11-0733.0 ppb
2017-11-07178.0 ppb
2017-11-07ND
2017-12-12190.0 ppb
2017-12-12201.0 ppb
2017-12-1224.0 ppb
2018-01-1167.0 ppb
2018-01-11289.0 ppb
2018-01-11ND
2018-02-2265.0 ppb
2018-02-22299.0 ppb
2018-02-22ND
2018-03-06134.0 ppb
2018-03-06204.0 ppb
2018-03-06ND
2018-04-16138.0 ppb
2018-04-16245.0 ppb
2018-04-16ND
2018-05-0478.0 ppb
2018-05-04135.0 ppb
2018-05-04ND
2018-06-13172.0 ppb
2018-06-13158.0 ppb
2018-06-13ND
2018-07-1774.0 ppb
2018-07-1796.0 ppb
2018-07-17ND
2018-08-16165.0 ppb
2018-08-16191.0 ppb
2018-08-16ND
2018-09-1229.0 ppb
2018-09-1273.0 ppb
2018-09-12ND
2018-10-04ND
2018-10-0435.0 ppb
2018-10-04ND
2018-11-27115.0 ppb
2018-11-27ND
2018-11-2730.0 ppb
2018-12-17178.0 ppb
2018-12-1777.0 ppb
2018-12-1723.0 ppb
2019-01-28135.0 ppb
2019-01-2858.0 ppb
2019-01-2839.0 ppb
2019-02-1231.0 ppb
2019-02-12ND
2019-02-12ND
2019-03-19156.0 ppb
2019-03-19176.0 ppb
2019-03-1977.0 ppb
2019-04-1684.0 ppb
2019-04-16ND
2019-04-16ND
2019-05-21251.0 ppb
2019-05-21ND
2019-05-21ND
2019-06-18103.0 ppb
2019-06-18101.0 ppb
2019-06-1862.0 ppb
2019-07-15186.0 ppb
2019-07-15205.0 ppb
2019-07-15104.0 ppb
2019-08-19291.0 ppb
2019-08-19342.0 ppb
2019-08-19214.0 ppb
2019-09-17163.0 ppb
2019-09-17294.0 ppb
2019-09-17138.0 ppb
2019-10-15137.0 ppb
2019-10-1584.0 ppb
2019-10-1591.0 ppb
2019-11-1870.0 ppb
2019-11-1874.0 ppb
2019-11-18228.0 ppb
2019-12-16ND
2019-12-16ND
2019-12-1653.0 ppb