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National Drinking Water Database


Chlorite in Massachusetts


Chlorite is a disinfection byproduct resulting from water treatment with chlorine dioxide, or from the use of chlorine dioxide as a bleaching agent for cellulose, paper pulp, flour and oils. [read more]

The Most Polluted Communities in Massachusetts

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

Ranked by highest average Chlorite level

RankSystem Population Served Positive test results of total reported tests Average Level
(Range)
1Ipswich Dpu Water Dept
Ipswich, MA
16,34858 of 58444.29 ppb
(10 to 1110 ppb)
2Lowell Water Department
Lowell, MA
135,00025 of 25315.73 ppb
(28.67 to 710 ppb)
3Scituate Water Division
Scituate, MA
27,20022 of 22243.18 ppb
(143.67 to 376 ppb)
4Cherry Valley & Rochdale Water District
Leicester, MA
4,50049 of 54109.62 ppb
(0 to 533.33 ppb)
5Lynn Water & Sewer Comm
Lynn, MA
89,05054 of 5475.42 ppb
(30 to 173.33 ppb)
6Tewksbury Water Dept
Tewksbury, MA
29,77036 of 5452.83 ppb
(0 to 290 ppb)
7Methuen Water Dept
Methuen, MA
43,78939 of 5331.23 ppb
(0 to 370.67 ppb)
8Lawrence Water Works
Lawrence, MA
72,0434 of 89.23 ppb
(0 to 32.33 ppb)
9Westford Water Department
MA
15,8531 of 140.12 ppb
(0 to 1.67 ppb)

Health Based Limits for Chlorite

StandardDescriptionLevel
Maximum Contaminant Limit Goal (MCLG)A non-enforceable health goal that is set at a level at which no known or anticipated adverse effect on the health of persons occurs and which allows an adequate margin of safety. Source: U.S. Environmental Protection Agency.800 ppb
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
Maximum Contaminant Limit (MCL)The enforceable standard which defines the highest level of a contaminant that is allowed in drinking water. MCLs are set as close to health-based limits (Maximum Contaminant Level Goals, or MCLGs) as feasible using the best available analytical and treatment technologies and taking cost into consideration. Source: U.S. Environmental Protection Agency.1000 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 Chlorite in Massachusetts

Data from the U.S. Environmental Protection Agency includes the following violations of federal standards in Massachusetts since 2004

Violation TypeNumber of Violations
Monitoring and Reporting Disinfection Byproduct Rule1
Over maximum contaminant level, Average1