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National Drinking Water Database


Chlorine dioxide in California


Chlorine dioxide is used as drinking water disinfection agent and as a bleaching agent for cellulose, paper pulp, flour and oils; in water, it rapidly decomposes into toxic disinfection byproducts chlorite and chlorate. [read more]

The Most Polluted Communities in California

5 water utilities reported detecting Chlorine dioxide in tap water since 2004, according to EWG's analysis of water quality data supplied by state water agencies

Ranked by highest average Chlorine dioxide level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Los Angeles Department of Water and Power
Los Angeles, CA
3,828,7003 of 31966.67 ppb
(1700 to 2400 ppb)
2City of Corona
Corona, CA
150,2532 of 21404 ppb
(1367 to 1441 ppb)
3City of Napa
Napa, CA
70,0004 of 789.29 ppb
(0 to 350 ppb)
4City of Daly City
Daly City, CA
92,3119 of 1457.14 ppb
(0 to 190 ppb)
5Carlsbad Mwd
Carlsbad, CA
53,550821 of 1,08146.98 ppb
(0 to 480 ppb)

Health Based Limits for Chlorine dioxide

StandardDescriptionLevel
Lifetime health-based limit, non-cancer riskConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for a lifetime of exposure. The Lifetime health-based limit (or Health Advisory, HA) is based on exposure for a a 70-kg adult consuming 2 liters of water per day. Source: U.S. Environmental Protection Agency.800 ppb
Children's health-based limit for 1-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic health effects for up to one day of exposure. The One-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.840 ppb
Children's health-based limit for 10-day exposureConcentration of a chemical in drinking water that is not expected to cause any adverse, noncarcinogenic effects for up to ten days of exposure. The Ten-Day health-based limit (or Health Advisory, HA) is typically set to protect a 10-kg child consuming 1 liter of water per day. Source: U.S. Environmental Protection Agency.840 ppb
Drinking Water Equivalent LevelA lifetime exposure concentration protective of adverse, noncarcinogenic health effects, that assumes all of the exposure to a contaminant is from drinking water. Source: U.S. Environmental Protection Agency.1000 ppb

Violation Summary for Chlorine dioxide in California

There are no violations reported for this contaminant in California