The Power of Information

National Drinking Water Database

Bromate in Massachusetts

Bromate is a carcinogenic disinfection byproduct of ozonation formed when source waters contain high levels of natural bromide; it can also form following water treatment with chlorine dioxide or hypochlorite. [read more]

The Most Polluted Communities in Massachusetts

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

Ranked by highest average Bromate level

RankSystem Population Served Positive test results of total reported tests Average Level
1Concord Water Dept
Concord, MA
16,0005 of 52.62 ppb
(2.2 to 3.4 ppb)
2Hamilton Water Dept
Hamilton, MA
8,1941 of 31.83 ppb
(0 to 5.5 ppb)
3Attleboro Water Dept
Attleboro, MA
40,0001 of 131.51 ppb
(0 to 19.6 ppb)
4Cambridge Water Department
Cambridge, MA
101,35520 of 611.27 ppb
(0 to 5.8 ppb)
5North Brookfield Water Department
North Brookfield, MA
4,5091 of 120.57 ppb
(0 to 6.8 ppb)
6Billerica Water Dept
Billerica, MA
38,9811 of 330.45 ppb
(0 to 15 ppb)
7Westford Water Department
15,8531 of 120.28 ppb
(0 to 3.3 ppb)
8Gardner Water Department
Gardner, MA
20,7703 of 470.16 ppb
(0 to 4.15 ppb)

Health Based Limits for Bromate

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.0 ppb
One in one million (10-6) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 1,000,000. Source: U.S. Environmental Protection Agency.0.05 ppb
One in ten thousand (10-4) Cancer RiskThe concentration of a chemical in drinking water corresponding to an excess estimated lifetime cancer risk of 1 in 10,000. Source: U.S. Environmental Protection Agency.5 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.10 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.140 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.200 ppb

Violation Summary for Bromate 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