Chlorite

Canton Water Department (MWRA)

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

254

Samples

Samples exceeding legal limit (MCL)

112

Samples exceeding
health guidelines

Testing results - average by year

Year	Average result	Samples taken	Detections	Range of results
2014	N/A	0	0	N/A
2015	209.2 ppb	62	50	ND - 450.0 ppb
2016	279.1 ppb	60	46	ND - 540.0 ppb
2017	113.2 ppb	72	38	ND - 590.0 ppb
2018	72.0 ppb	60	10	ND - 770.0 ppb
2019	N/A	0	0	N/A

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
2015-01-14	350.0 ppb
2015-01-14	350.0 ppb
2015-01-14	190.0 ppb
2015-01-14	190.0 ppb
2015-01-14	410.0 ppb
2015-01-14	410.0 ppb
2015-02-25	190.0 ppb
2015-02-25	190.0 ppb
2015-04-10	450.0 ppb
2015-04-10	450.0 ppb
2015-04-10	260.0 ppb
2015-04-10	260.0 ppb
2015-04-10	440.0 ppb
2015-04-10	440.0 ppb
2015-05-21	220.0 ppb
2015-05-21	220.0 ppb
2015-05-21	130.0 ppb
2015-05-21	130.0 ppb
2015-05-21	370.0 ppb
2015-05-21	370.0 ppb
2015-06-11	340.0 ppb
2015-06-11	340.0 ppb
2015-06-11	ND
2015-06-11	ND
2015-06-11	420.0 ppb
2015-06-11	420.0 ppb
2015-07-21	200.0 ppb
2015-07-21	200.0 ppb
2015-07-21	ND
2015-07-21	ND
2015-07-21	260.0 ppb
2015-07-21	260.0 ppb
2015-08-18	260.0 ppb
2015-08-18	260.0 ppb
2015-08-18	ND
2015-08-18	ND
2015-08-18	240.0 ppb
2015-08-18	240.0 ppb
2015-09-24	180.0 ppb
2015-09-24	180.0 ppb
2015-09-24	ND
2015-09-24	ND
2015-09-24	280.0 ppb
2015-09-24	280.0 ppb
2015-10-22	ND
2015-10-22	ND
2015-10-22	ND
2015-10-22	ND
2015-10-22	15.0 ppb
2015-10-22	15.0 ppb
2015-11-24	270.0 ppb
2015-11-24	270.0 ppb
2015-11-24	230.0 ppb
2015-11-24	230.0 ppb
2015-11-24	260.0 ppb
2015-11-24	260.0 ppb
2015-12-09	150.0 ppb
2015-12-09	150.0 ppb
2015-12-09	81.0 ppb
2015-12-09	81.0 ppb
2015-12-09	290.0 ppb
2015-12-09	290.0 ppb
2016-01-19	320.0 ppb
2016-01-19	320.0 ppb
2016-01-19	110.0 ppb
2016-01-19	110.0 ppb
2016-01-19	340.0 ppb
2016-01-19	340.0 ppb
2016-02-25	430.0 ppb
2016-02-25	430.0 ppb
2016-02-25	220.0 ppb
2016-02-25	220.0 ppb
2016-02-25	540.0 ppb
2016-02-25	540.0 ppb
2016-03-24	410.0 ppb
2016-03-24	410.0 ppb
2016-03-24	230.0 ppb
2016-03-24	230.0 ppb
2016-03-24	480.0 ppb
2016-03-24	480.0 ppb
2016-05-11	510.0 ppb
2016-05-11	510.0 ppb
2016-05-11	280.0 ppb
2016-05-11	280.0 ppb
2016-05-11	440.0 ppb
2016-05-11	440.0 ppb
2016-06-29	460.0 ppb
2016-06-29	460.0 ppb
2016-06-29	34.0 ppb
2016-06-29	34.0 ppb
2016-06-29	230.0 ppb
2016-06-29	230.0 ppb
2016-07-13	340.0 ppb
2016-07-13	340.0 ppb
2016-07-13	ND
2016-07-13	ND
2016-07-13	ND
2016-07-13	ND
2016-08-25	ND
2016-08-25	ND
2016-08-25	ND
2016-08-25	ND
2016-08-25	40.0 ppb
2016-08-25	40.0 ppb
2016-10-31	ND
2016-10-31	ND
2016-10-31	ND
2016-10-31	ND
2016-10-31	ND
2016-10-31	ND
2016-11-28	500.0 ppb
2016-11-28	500.0 ppb
2016-11-28	500.0 ppb
2016-11-28	500.0 ppb
2016-11-28	500.0 ppb
2016-11-28	500.0 ppb
2016-12-28	500.0 ppb
2016-12-28	500.0 ppb
2016-12-28	470.0 ppb
2016-12-28	470.0 ppb
2016-12-28	490.0 ppb
2016-12-28	490.0 ppb
2017-01-10	580.0 ppb
2017-01-10	580.0 ppb
2017-01-10	590.0 ppb
2017-01-10	590.0 ppb
2017-01-10	580.0 ppb
2017-01-10	580.0 ppb
2017-02-27	580.0 ppb
2017-02-27	580.0 ppb
2017-02-27	ND
2017-02-27	ND
2017-02-27	590.0 ppb
2017-02-27	590.0 ppb
2017-03-23	ND
2017-03-23	ND
2017-03-23	ND
2017-03-23	ND
2017-03-23	ND
2017-03-23	ND
2017-04-18	ND
2017-04-18	ND
2017-04-18	ND
2017-04-18	ND
2017-04-18	140.0 ppb
2017-04-18	140.0 ppb
2017-05-30	ND
2017-05-30	ND
2017-05-30	ND
2017-05-30	ND
2017-05-30	ND
2017-05-30	ND
2017-06-20	13.0 ppb
2017-06-20	13.0 ppb
2017-06-20	13.0 ppb
2017-06-20	13.0 ppb
2017-06-20	20.0 ppb
2017-06-20	20.0 ppb
2017-07-11	28.0 ppb
2017-07-11	28.0 ppb
2017-07-11	29.0 ppb
2017-07-11	29.0 ppb
2017-07-11	26.0 ppb
2017-07-11	26.0 ppb
2017-08-03	16.0 ppb
2017-08-03	16.0 ppb
2017-08-03	16.0 ppb
2017-08-03	16.0 ppb
2017-08-03	15.0 ppb
2017-08-03	15.0 ppb
2017-09-12	ND
2017-09-12	ND
2017-09-12	ND
2017-09-12	ND
2017-09-12	ND
2017-09-12	ND
2017-10-16	ND
2017-10-16	ND
2017-10-16	ND
2017-10-16	ND
2017-10-16	27.0 ppb
2017-10-16	27.0 ppb
2017-11-14	470.0 ppb
2017-11-14	470.0 ppb
2017-11-14	11.0 ppb
2017-11-14	11.0 ppb
2017-11-14	330.0 ppb
2017-11-14	330.0 ppb
2017-12-20	ND
2017-12-20	ND
2017-12-20	ND
2017-12-20	ND
2017-12-20	ND
2017-12-20	ND
2018-01-03	ND
2018-01-03	ND
2018-01-03	ND
2018-01-03	ND
2018-01-03	ND
2018-01-03	ND
2018-02-07	ND
2018-02-07	ND
2018-02-07	ND
2018-02-07	ND
2018-02-07	ND
2018-02-07	ND
2018-03-09	ND
2018-03-09	ND
2018-03-09	ND
2018-03-09	ND
2018-03-09	ND
2018-03-09	ND
2018-04-05	ND
2018-04-05	ND
2018-04-05	ND
2018-04-05	ND
2018-04-05	ND
2018-04-05	ND
2018-05-03	ND
2018-05-03	ND
2018-05-03	ND
2018-05-03	ND
2018-05-03	ND
2018-05-03	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-06-04	ND
2018-07-09	ND
2018-07-09	ND
2018-07-09	18.0 ppb
2018-07-09	18.0 ppb
2018-07-09	620.0 ppb
2018-07-09	620.0 ppb
2018-08-06	770.0 ppb
2018-08-06	770.0 ppb
2018-08-06	11.0 ppb
2018-08-06	11.0 ppb
2018-08-06	740.0 ppb
2018-08-06	740.0 ppb
2018-09-07	ND
2018-09-07	ND
2018-09-07	ND
2018-09-07	ND
2018-09-07	ND
2018-09-07	ND
2018-10-04	ND
2018-10-04	ND
2018-10-04	ND
2018-10-04	ND
2018-10-04	ND
2018-10-04	ND