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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

City of Sweetwater

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

 

201

Samples

0

Samples exceeding legal limit (MCL)

67

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
201422.9 ppb2710ND - 114.0 ppb
201522.6 ppb308ND - 124.0 ppb
201692.8 ppb3623ND - 281.0 ppb
201735.9 ppb3613ND - 204.0 ppb
201836.4 ppb3615ND - 170.0 ppb
201941.9 ppb3616ND - 265.0 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
2014-01-15127085341.7 ppb
2014-01-151270854ND
2014-01-15127085559.8 ppb
2014-02-191279447ND
2014-02-191279448ND
2014-02-191279449ND
2014-03-181286109ND
2014-03-181286110ND
2014-03-181286111ND
2014-04-231295786ND
2014-04-231295785ND
2014-04-23129578755.1 ppb
2014-05-2113037839.20 ppb
2014-05-211303781ND
2014-05-211303782ND
2014-06-111309097104.0 ppb
2014-06-111309096114.0 ppb
2014-06-111309094ND
2014-07-231320336ND
2014-07-23132033537.4 ppb
2014-07-23132033447.5 ppb
2014-08-20132828274.7 ppb
2014-08-20132828173.9 ppb
2014-08-201328280ND
2014-12-161358169ND
2014-12-161358168ND
2014-12-161358167ND
2015-01-131364366ND
2015-01-131364365ND
2015-01-131364364ND
2015-03-101377973ND
2015-03-101377972ND
2015-03-101377971ND
2015-04-141386992ND
2015-04-141386993ND
2015-04-141386994ND
2015-06-171403974ND
2015-06-171403976ND
2015-06-171403975ND
2015-07-291414467ND
2015-07-291414465ND
2015-07-291414466ND
2015-08-191420688ND
2015-08-19142069066.0 ppb
2015-08-19142068984.0 ppb
2015-09-16142835735.6 ppb
2015-09-161428356ND
2015-09-16142835536.2 ppb
2015-10-141435530ND
2015-10-141435531105.0 ppb
2015-10-141435532106.0 ppb
2015-11-191445686122.0 ppb
2015-11-191445685124.0 ppb
2015-11-191445684ND
2015-12-161452831ND
2015-12-161452830ND
2015-12-161452829ND
2016-01-26146215897.7 ppb
2016-01-261462159107.0 ppb
2016-01-261462157ND
2016-02-181468713168.0 ppb
2016-02-181468712139.0 ppb
2016-02-181468711ND
2016-03-091473558ND
2016-03-091473554ND
2016-03-091473559215.0 ppb
2016-04-131482444206.0 ppb
2016-04-131482443ND
2016-04-131482445258.0 ppb
2016-05-25149432010.3 ppb
2016-05-251494318281.0 ppb
2016-05-251494319265.0 ppb
2016-06-221501781144.0 ppb
2016-06-221501782143.0 ppb
2016-06-221501780ND
2016-07-211509569ND
2016-07-21150956820.1 ppb
2016-07-211509567ND
2016-08-171517049ND
2016-08-17151704868.1 ppb
2016-08-17151704776.2 ppb
2016-09-221527593ND
2016-09-22152759491.8 ppb
2016-09-22152759573.1 ppb
2016-10-251535487ND
2016-10-251535488138.0 ppb
2016-10-251535489ND
2016-11-181542819279.0 ppb
2016-11-181542818280.0 ppb
2016-11-181542817ND
2016-12-211550580153.0 ppb
2016-12-211550581108.0 ppb
2016-12-21155057920.7 ppb
2017-01-201557621ND
2017-01-201557620ND
2017-01-20155761946.4 ppb
2017-02-211566392ND
2017-02-211566391ND
2017-02-211566393ND
2017-03-021573902ND
2017-03-221573901ND
2017-03-221573900ND
2017-04-211582768ND
2017-04-211582767ND
2017-04-211582766ND
2017-05-231590798ND
2017-05-231590799ND
2017-05-231590800ND
2017-06-231599067ND
2017-06-231599068104.0 ppb
2017-06-23159906968.4 ppb
2017-07-181606125ND
2017-07-181606114ND
2017-07-181606126ND
2017-08-25161637425.7 ppb
2017-08-251616373ND
2017-08-25161637557.4 ppb
2017-09-221624689ND
2017-09-22162469068.5 ppb
2017-09-22162468817.7 ppb
2017-10-251633590133.0 ppb
2017-10-251633589173.0 ppb
2017-10-251633588ND
2017-11-171640131131.0 ppb
2017-11-171640130ND
2017-11-171640132102.0 ppb
2017-12-081645112ND
2017-12-081645113162.0 ppb
2017-12-081645114204.0 ppb
2018-01-261657214ND
2018-01-26165721691.6 ppb
2018-01-26165721575.7 ppb
2018-02-221663910ND
2018-02-221663909ND
2018-02-221663911ND
2018-03-021666156122.0 ppb
2018-03-02166615537.5 ppb
2018-03-021666157170.0 ppb
2018-04-061675459ND
2018-04-061675158ND
2018-04-061675457ND
2018-05-181686587ND
2018-05-181686586ND
2018-05-181686588ND
2018-06-251696084ND
2018-06-251696085ND
2018-06-251696083ND
2018-07-101699991ND
2018-07-10169999340.8 ppb
2018-07-10169999229.5 ppb
2018-08-141710056146.0 ppb
2018-08-141710057104.0 ppb
2018-08-141710055ND
2018-09-191719690ND
2018-09-191719692ND
2018-09-191719691ND
2018-10-091725710ND
2018-10-09172571390.4 ppb
2018-10-09172571266.8 ppb
2018-11-06173342464.0 ppb
2018-11-061733426ND
2018-11-06173342575.6 ppb
2018-12-11174296475.8 ppb
2018-12-111742965ND
2018-12-111742963121.0 ppb
2019-01-081749412ND
2019-01-08174941040.6 ppb
2019-01-08174941152.9 ppb
2019-02-121759190ND
2019-02-121759188ND
2019-02-12175919113.5 ppb
2019-03-121766937121.0 ppb
2019-03-12176693492.0 ppb
2019-03-121766938ND
2019-04-09177434160.7 ppb
2019-04-091774342ND
2019-04-09177434084.8 ppb
2019-05-211785904123.0 ppb
2019-05-211785905ND
2019-05-211785903109.0 ppb
2019-06-111791901ND
2019-06-111791900ND
2019-06-111791899ND
2019-07-091800008ND
2019-07-09180000770.8 ppb
2019-07-09180000676.4 ppb
2019-08-131810340ND
2019-08-131810341ND
2019-08-131810342ND
2019-09-101819229ND
2019-09-101819228ND
2019-09-101819227ND
2019-10-08182842065.0 ppb
2019-10-081828419ND
2019-10-08182842123.0 ppb
2019-11-131838487ND
2019-11-131838486ND
2019-11-131838484ND
2019-12-101846642247.0 ppb
2019-12-10184664163.6 ppb
2019-12-101846640265.0 ppb