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EWG's Tap Water Database — 2021 UPDATE

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Chlorite

Skagit County Public Utility District 1 Judy Reservoir

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

 

224

Samples

0

Samples exceeding legal limit (MCL)

116

Samples exceeding
health guidelines

Testing results - average by year

 
YearAverage resultSamples takenDetectionsRange of results
2014481.4 ppb5050280.0 ppb - 700.0 ppb
20150.425 ppb36360.257 ppb - 0.571 ppb
20160.409 ppb3634ND - 0.710 ppb
20170.662 ppb36360.458 ppb - 0.923 ppb
2018566.3 ppb3636375.0 ppb - 775.0 ppb
2019463.5 ppb3030346.0 ppb - 647.0 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
2014-01-0833472480.0 ppb
2014-01-0833471470.0 ppb
2014-01-0833473540.0 ppb
2014-03-0535222500.0 ppb
2014-03-0535223480.0 ppb
2014-03-0535224520.0 ppb
2014-04-0236242570.0 ppb
2014-04-0236243580.0 ppb
2014-04-0236244450.0 ppb
2014-05-0737539460.0 ppb
2014-05-0737537450.0 ppb
2014-05-0737538430.0 ppb
2014-06-0438482440.0 ppb
2014-06-0438483400.0 ppb
2014-06-0438481400.0 ppb
2014-07-0239469460.0 ppb
2014-07-0239470460.0 ppb
2014-07-0239468430.0 ppb
2014-08-0640713350.0 ppb
2014-08-0640711700.0 ppb
2014-08-0640712600.0 ppb
2014-09-0341920420.0 ppb
2014-09-0341921520.0 ppb
2014-09-0341922500.0 ppb
2014-09-1742804540.0 ppb
2014-09-1842805630.0 ppb
2014-09-1942806610.0 ppb
2014-09-2042807540.0 ppb
2014-09-2142808520.0 ppb
2014-09-2242809540.0 ppb
2014-09-2342810510.0 ppb
2014-09-2442811530.0 ppb
2014-10-0243299460.0 ppb
2014-10-0343300430.0 ppb
2014-10-0443301500.0 ppb
2014-10-0543302500.0 ppb
2014-10-0643303470.0 ppb
2014-10-0743304490.0 ppb
2014-10-0843305510.0 ppb
2014-10-0943587520.0 ppb
2014-10-1043588520.0 ppb
2014-10-1143589440.0 ppb
2014-10-1243590440.0 ppb
2014-10-1343591500.0 ppb
2014-11-0544591280.0 ppb
2014-11-0544589410.0 ppb
2014-11-0544590450.0 ppb
2014-12-0345655360.0 ppb
2014-12-0345657380.0 ppb
2014-12-0345656380.0 ppb
2015-01-07468250.510 ppb
2015-01-07468240.430 ppb
2015-01-07468260.340 ppb
2015-02-03048270.571 ppb
2015-02-03048260.459 ppb
2015-02-03048250.491 ppb
2015-03-03088760.493 ppb
2015-03-03088750.535 ppb
2015-03-03088740.456 ppb
2015-04-08147430.518 ppb
2015-04-08147410.468 ppb
2015-04-08147420.447 ppb
2015-05-05195870.515 ppb
2015-05-05195860.478 ppb
2015-05-05195850.491 ppb
2015-06-04253620.486 ppb
2015-06-04253610.406 ppb
2015-06-04253630.426 ppb
2015-07-01297940.478 ppb
2015-07-01297930.452 ppb
2015-07-01297920.469 ppb
2015-08-05358320.381 ppb
2015-08-05358330.296 ppb
2015-08-05358340.325 ppb
2015-09-01410510.426 ppb
2015-09-01410500.309 ppb
2015-09-01410490.362 ppb
2015-10-01472530.342 ppb
2015-10-01472540.257 ppb
2015-10-01472550.324 ppb
2015-11-04531330.439 ppb
2015-11-04531340.303 ppb
2015-11-04531350.431 ppb
2015-12-02577600.414 ppb
2015-12-02577500.374 ppb
2015-12-02577450.402 ppb
2016-01-060.422 ppb
2016-01-060.398 ppb
2016-01-060.389 ppb
2016-02-040.407 ppb
2016-02-040.377 ppb
2016-02-040.395 ppb
2016-03-020.448 ppb
2016-03-020.380 ppb
2016-03-020.451 ppb
2016-04-060.509 ppb
2016-04-060.503 ppb
2016-04-060.417 ppb
2016-05-040.507 ppb
2016-05-040.460 ppb
2016-05-040.483 ppb
2016-06-01ND
2016-06-010.286 ppb
2016-06-01ND
2016-07-060.275 ppb
2016-07-060.204 ppb
2016-07-060.301 ppb
2016-08-030.537 ppb
2016-08-030.346 ppb
2016-08-030.464 ppb
2016-09-070.491 ppb
2016-09-070.369 ppb
2016-09-070.437 ppb
2016-10-050.363 ppb
2016-10-050.395 ppb
2016-10-110.548 ppb
2016-11-070.397 ppb
2016-11-070.442 ppb
2016-11-070.449 ppb
2016-12-080.483 ppb
2016-12-090.710 ppb
2016-12-090.674 ppb
2017-01-100.608 ppb
2017-01-100.715 ppb
2017-01-100.761 ppb
2017-02-010.620 ppb
2017-02-010.586 ppb
2017-02-010.615 ppb
2017-03-010.535 ppb
2017-03-010.511 ppb
2017-03-010.555 ppb
2017-04-060.607 ppb
2017-04-060.458 ppb
2017-04-060.614 ppb
2017-05-040.669 ppb
2017-05-040.668 ppb
2017-05-040.510 ppb
2017-06-070.789 ppb
2017-06-070.719 ppb
2017-06-070.763 ppb
2017-07-050.704 ppb
2017-07-050.737 ppb
2017-07-050.591 ppb
2017-08-020.648 ppb
2017-08-020.810 ppb
2017-08-020.767 ppb
2017-09-060.923 ppb
2017-09-060.709 ppb
2017-09-060.816 ppb
2017-10-040.797 ppb
2017-10-040.810 ppb
2017-10-040.706 ppb
2017-11-010.663 ppb
2017-11-010.632 ppb
2017-11-010.610 ppb
2017-12-060.524 ppb
2017-12-060.557 ppb
2017-12-060.542 ppb
2018-01-18580.0 ppb
2018-01-18391.0 ppb
2018-01-18561.0 ppb
2018-02-15562.0 ppb
2018-02-15444.0 ppb
2018-02-15591.0 ppb
2018-03-07580.0 ppb
2018-03-07506.0 ppb
2018-03-07663.0 ppb
2018-04-04588.0 ppb
2018-04-04424.0 ppb
2018-04-04617.0 ppb
2018-05-02611.0 ppb
2018-05-02534.0 ppb
2018-05-02705.0 ppb
2018-06-06686.0 ppb
2018-06-06643.0 ppb
2018-06-06671.0 ppb
2018-07-05615.0 ppb
2018-07-05612.0 ppb
2018-07-05691.0 ppb
2018-08-01648.0 ppb
2018-08-01630.0 ppb
2018-08-01775.0 ppb
2018-09-05571.0 ppb
2018-09-05613.0 ppb
2018-09-05672.0 ppb
2018-10-03448.0 ppb
2018-10-03554.0 ppb
2018-10-03532.0 ppb
2018-11-07513.0 ppb
2018-11-07404.0 ppb
2018-11-07524.0 ppb
2018-12-05406.0 ppb
2018-12-05375.0 ppb
2018-12-05448.0 ppb
2019-01-09417.0 ppb
2019-01-09412.0 ppb
2019-01-09486.0 ppb
2019-03-06446.0 ppb
2019-03-06494.0 ppb
2019-03-06465.0 ppb
2019-04-03417.0 ppb
2019-04-03448.0 ppb
2019-04-03441.0 ppb
2019-05-08485.0 ppb
2019-05-08538.0 ppb
2019-05-08444.0 ppb
2019-07-03459.0 ppb
2019-07-03577.0 ppb
2019-07-03492.0 ppb
2019-08-07440.0 ppb
2019-08-07552.0 ppb
2019-08-07430.0 ppb
2019-09-05423.0 ppb
2019-09-05348.0 ppb
2019-09-06346.0 ppb
2019-10-10379.0 ppb
2019-10-11352.0 ppb
2019-10-11458.0 ppb
2019-11-06487.0 ppb
2019-11-06535.0 ppb
2019-11-06409.0 ppb
2019-12-11592.0 ppb
2019-12-11647.0 ppb
2019-12-11485.0 ppb