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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Harnett County Department of Public Utilities

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

 

68

Samples

0

Samples exceeding legal limit (MCL)

68

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014303.8 ppb88140.0 ppb - 440.0 ppb
2015325.1 ppb1212256.0 ppb - 460.0 ppb
2016241.7 ppb1212140.0 ppb - 350.0 ppb
2017263.3 ppb1212140.0 ppb - 380.0 ppb
2018262.5 ppb1212130.0 ppb - 430.0 ppb
2019325.8 ppb1212140.0 ppb - 500.0 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
2014-01-0937729_14-00973270.0 ppb
2014-01-0937729_14-00974180.0 ppb
2014-04-0237729_14-09590140.0 ppb
2014-04-0237729_14-09589420.0 ppb
2014-07-0837729_14-20449440.0 ppb
2014-07-0837729_14-20450410.0 ppb
2014-10-0823276-1270.0 ppb
2014-10-0823276-2300.0 ppb
2015-01-06288.0 ppb
2015-01-06256.0 ppb
2015-01-06257.0 ppb
2015-04-08270.0 ppb
2015-04-08350.0 ppb
2015-04-08460.0 ppb
2015-07-07440.0 ppb
2015-07-07290.0 ppb
2015-07-07290.0 ppb
2015-10-06290.0 ppb
2015-10-06270.0 ppb
2015-10-06440.0 ppb
2016-01-0537729_16-00723350.0 ppb
2016-01-0537729_16-00724260.0 ppb
2016-01-0537729_16-00725250.0 ppb
2016-04-0637729_16-11002270.0 ppb
2016-04-0637729_16-11001140.0 ppb
2016-04-0637729_16-11000210.0 ppb
2016-07-1337729_16-23379300.0 ppb
2016-07-1337729_16-23380260.0 ppb
2016-07-1337729_16-23381280.0 ppb
2016-10-0437729_16-35204230.0 ppb
2016-10-0437729_16-35203150.0 ppb
2016-10-0437729_16-35202200.0 ppb
2017-01-0437729_17-00751380.0 ppb
2017-01-0437729_17-00752340.0 ppb
2017-01-0437729_17-00749380.0 ppb
2017-04-0537729_17-12599320.0 ppb
2017-04-0537729_17-12598280.0 ppb
2017-04-0537729_17-12597330.0 ppb
2017-07-1237729_17-24530140.0 ppb
2017-07-1237729_17-24531170.0 ppb
2017-07-1237729_17-24529210.0 ppb
2017-10-0437729_17-37584300.0 ppb
2017-10-0437729_17-37585170.0 ppb
2017-10-0437729_17-37586140.0 ppb
2018-01-0337729_18-00587 130.0 ppb
2018-01-0337729_18-00586 170.0 ppb
2018-01-0337729_18-00585 200.0 ppb
2018-04-0337729_18-13438 300.0 ppb
2018-04-0337729_18-13437 130.0 ppb
2018-04-0337729_18-13436 180.0 ppb
2018-07-0237729_18-27429 260.0 ppb
2018-07-0237729_18-27430 250.0 ppb
2018-07-0237729_18-27431 320.0 ppb
2018-10-0437729_18-42507 410.0 ppb
2018-10-0437729_18-42508 430.0 ppb
2018-10-0437729_18-42509 370.0 ppb
2019-01-0237729_19-01769 340.0 ppb
2019-01-0237729_19-01770 210.0 ppb
2019-01-0237729_19-01771 310.0 ppb
2019-04-0337729_19-13992 260.0 ppb
2019-04-0337729_19-13993 200.0 ppb
2019-04-0337729_19-13994 140.0 ppb
2019-07-0237729_19-27964 460.0 ppb
2019-07-0237729_19-27965 490.0 ppb
2019-07-0237729_19-27963 500.0 ppb
2019-10-0237729_19-43055 280.0 ppb
2019-10-0237729_19-43054 280.0 ppb
2019-10-0237729_19-43053 440.0 ppb