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EWG's Tap Water Database — 2019 UPDATE

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Chlorite

Status: National drinking water standard exists

 

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.

2015-2017:

FOUND
FOUND ABOVE HEALTH GUIDELINES

27

states detected

1,199

utilities detected

26 million

people served

26

states over health guideline

1,183

utilities over health guideline

22 million

people served over health guideline

Health concerns for chlorite

Change to blood cells

Change to the thyroid

Hormone disruption

Harm to reproduction and child development

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

States reporting chlorite in drinking water

UTILITIES REPORTING ABOVE HEALTH GUIDELINES UTILITIES WITH CONTAMINATION
State UtilitiesPeople Served UtilitiesPeople Served
Texas3626,191,4663978,594,197
Arizona92,227,856102,294,856
California61,644,29981,822,215
Alabama901,667,680781,538,890
North Carolina45659,873471,482,604
Arkansas921,466,814811,428,215
Oklahoma1131,102,3341211,286,883
Kentucky281,128,603411,183,263
Georgia221,027,041241,172,777
Pennsylvania201,160,755181,160,460
Colorado651,045,087581,106,568
Kansas66597,69475623,672
Virginia10420,05214603,567
Massachusetts12352,89716498,472
Illinois104381,17085360,038
Iowa33202,80022195,633
Missouri48148,90039144,291
Ohio10101,44610122,696
Connecticut9123,0658121,765
West Virginia1187,4641087,168
Rhode Island13,178570,231
New York1745,6811970,212
Washington00366,094
Maine131,440131,440
Nebraska628,537628,537
Minnesota120,400120,400
New Mexico28,13728,137
MORE
LESS

Filtering technologies that reduce chlorite

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Activated Carbon

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Reverse Osmosis

Utilities with the highest amounts of chlorite, 2015-2017

ALL UTILITIES
LARGE UTILITIES
UtilityLocationTestsAverage levelPeople served
WatsonWatson, IL36 of 36803.1 ppb729
Clay CityClay City, IL36 of 36803.1 ppb1,114
West SalemWest Salem, IL36 of 36803.1 ppb1,027
OwanecoOwaneco, IL36 of 36803.1 ppb245
E J Water Corp*Dieterich, IL36 of 36803.1 ppb12,896
EdgewoodEdgewood, IL36 of 36803.1 ppb550
LouisvilleLouisville, IL36 of 36803.1 ppb1,100
Saint MarieSte Marie, IL36 of 36803.1 ppb300
Curry Water AuthorityJasper, AL24 of 24799.0 ppb17,160
Boldo Water and Fire Prot. AuthorityJasper, AL24 of 24799.0 ppb4,521
Cordova Water Works and Gas Board*Cordova, AL24 of 24799.0 ppb4,158
Jasper Water Works and Sewer Board*Jasper, AL24 of 24799.0 ppb29,700
Oakman Water WorksOakman, AL24 of 24799.0 ppb3,414
Parrish Water Works BoardParrish, AL24 of 24799.0 ppb5,859
Sumiton Water Works BoardSumiton, AL24 of 24799.0 ppb6,159
Dora UtilitiesDora, AL24 of 24799.0 ppb4,305
Townley Water AuthorityTownley, AL24 of 24799.0 ppb2,511
Providence Water AuthorityOakman, AL24 of 24799.0 ppb1,362
Clarinda Water Plant*Clarinda, IA108 of 108773.9 ppb4,822
Southwest Reg Water District (clarinda)*Clarinda, IA108 of 108773.9 ppb2,569
Public Wholesale Water Supply District 19*Columbus, KS68 of 68769.5 ppb5,569
Cherokee County Rural Water District 7Pittsburg, KS68 of 68769.5 ppb158
City of PortlandPortland, TX103 of 103759.8 ppb20,000
City of Aransas PassAransas Pass, TX103 of 103759.8 ppb8,329
Seaboard Water Supply CorporationOdem, TX103 of 103759.8 ppb285
City of Ingleside On The BayIngleside, TX103 of 103759.8 ppb642
City of TaftTaft, TX103 of 103759.8 ppb4,560
City of Rockport*Rockport, TX103 of 103759.8 ppb26,450
City of InglesideIngleside, TX103 of 103759.8 ppb9,800
San Patricio Municipal Water District*Ingleside, TX103 of 103759.8 ppb225
City of OdemOdem, TX103 of 103759.8 ppb2,500
Rincon Water Supply CorporationTaft, TX103 of 103759.8 ppb4,236
City of GregoryGregory, TX103 of 103759.8 ppb1,976
GorevilleGoreville, IL36 of 36739.2 ppb938
Lake of Egypt PWD*Marion, IL36 of 36739.2 ppb10,560
Creal SpringsCreal Springs, IL36 of 36739.2 ppb858
Maryville*Maryville, MO108 of 108725.5 ppb11,972
Governmental Utility Service Corporation*Bessemer, AL21 of 21717.5 ppb32
Bessemer Water Service*Bessemer, AL21 of 21717.5 ppb81,759
Pottawatomie County Development AuthorityShawnee, OK37 of 39712.8 ppb1,200
Shawnee Municipal Authority*Shawnee, OK37 of 39712.8 ppb29,990
Meeker Public Works AuthorityMeeker, OK37 of 39712.8 ppb1,044
Vienna Correctional CenterVienna, IL36 of 36712.2 ppb3,462
Belle Vernon Borough Municipal AuthorityBelle Vernon, PA966 of 973711.2 ppb6,000
Fordyce, Village ofFordyce, NE24 of 24705.5 ppb135
St. Helena, Village ofSt Helena, NE24 of 24705.5 ppb96
Cedar-Knox Rural Water Project*Harrington, NE24 of 24705.5 ppb2,494
Crofton, City ofCrofton, NE24 of 24705.5 ppb754
Obert, Village ofObert, NE24 of 24705.5 ppb58
Shelby County Water System*Columbiana, AL4 of 4701.0 ppb34,647

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Chlorite, but it likely has the contaminant in its water supply.

UtilityLocationTestsAverage levelPeople served
E J Water Corp*Dieterich, IL36 of 36803.1 ppb12,896
Curry Water AuthorityJasper, AL24 of 24799.0 ppb17,160
Jasper Water Works and Sewer Board*Jasper, AL24 of 24799.0 ppb29,700
City of Rockport*Rockport, TX103 of 103759.8 ppb26,450
City of PortlandPortland, TX103 of 103759.8 ppb20,000
Lake of Egypt PWD*Marion, IL36 of 36739.2 ppb10,560
Maryville*Maryville, MO108 of 108725.5 ppb11,972
Bessemer Water Service*Bessemer, AL21 of 21717.5 ppb81,759
Shawnee Municipal Authority*Shawnee, OK37 of 39712.8 ppb29,990
Shelby County Water System*Columbiana, AL4 of 4701.0 ppb34,647
Smiths Water and Sewer AuthoritySmiths Station, AL33 of 33685.0 ppb27,780
City of Mineral Wells*Mineral Wells, TX108 of 108679.4 ppb14,826
Alexander City Water Department*Alex City, AL21 of 21676.2 ppb27,000
City of Port ArthurPort Arthur, TX108 of 108670.6 ppb54,548
Hamilton Water Works and Sewer Board*Hamilton, AL18 of 18650.6 ppb10,500
Laguna Madre Water DistrictPort Isabel, TX107 of 108643.3 ppb19,317
Haleyville Water Works and Sewer Board*Haleyville, AL18 of 18634.2 ppb23,808
Searcy Waterworks*Searcy, AR36 of 36610.0 ppb23,768
City of Cullman Water Works*Cullman, AL18 of 18609.3 ppb31,080
Ravenna City PWSRavenna, OH108 of 108609.2 ppb14,000
Muscle Shoals Utility Board*Muscle Shoals, AL18 of 18604.3 ppb18,303
Public Wholesale WSD 5*Iola, KS108 of 108586.7 ppb12,192
Warrior River Water AuthorityMccalla, AL18 of 18576.9 ppb35,724
Claremore*Claremore, OK27 of 32576.7 ppb15,873
Murphysboro*Murphysboro, IL36 of 36566.7 ppb11,915
City of Corpus Christi*Corpus Christi, TX54 of 54540.8 ppb325,733
City of RaymondvilleRaymondville, TX108 of 108531.9 ppb11,288
Montgomery Water Works*Montgomery, AL9 of 9529.2 ppb240,840
City of Denison*Denison, TX102 of 108526.6 ppb22,682
Marshall County Water CorpMadill, OK82 of 90522.2 ppb14,717
Albion Village*Waterport, NY40 of 40517.9 ppb17,206
Mountain Home Waterworks*Mountain Home, AR36 of 36517.1 ppb15,877
City of Midlothian*Midlothian, TX217 of 217508.9 ppb16,728
East Rio Hondo WSC*Rio Hondo, TX103 of 114508.2 ppb21,726
City of Weatherford*Weatherford, TX108 of 108507.2 ppb26,428
Brunswick Regional Water and Sewer H2goLeland, NC111 of 111501.5 ppb20,663
Brunswick County Water System*Leland, NC111 of 111501.5 ppb77,891
Town of Oak IslandOak Island, NC111 of 111501.5 ppb20,523
Kansas City Board of Public Utilities*Kansas City, KS108 of 108496.1 ppb149,636
Windham Water WorksMansfield Center, CT36 of 36495.3 ppb21,214
Monroe*Monroe, GA48 of 48493.8 ppb21,739
East Larimer County WD*Fort Collins, CO12 of 12490.8 ppb19,472
North Marshall Utilities*Grant, AL18 of 18489.9 ppb12,369
Pueblo West MDPueblo West, CO36 of 36470.0 ppb30,000
McAllen Public UtilityMcallen, TX217 of 218468.3 ppb168,909
City of MissionMission, TX216 of 216467.0 ppb77,058
Consolidated Mutual Maple Grove*Lakewood, CO39 of 39464.6 ppb30,855
Zapata County Waterworks SWTP*Zapata, TX109 of 109462.6 ppb11,625
City of Snyder*Snyder, TX105 of 108461.2 ppb10,783
City of EdinburgEdinburg, TX213 of 218459.6 ppb77,100

* This water utility supplies finished drinking water to at least one other water utility. The purchasing utility is not required to test for or report Chlorite, but it likely has the contaminant in its water supply.