Indicator Profile of Disinfection By Products in Community Drinking Water Systems
Why Is This Important?Disinfection by products (DBPs) are formed when disinfectants (such as chlorine chemicals) used during water treatment to destroy harmful bacteria and viruses, react with natural organic matter in water. Trihalomethanes (THMs) and haloacetic acids (HAAs) are produced in the largest amounts. The level of DBPs formed after disinfection depends on the source water, type of treatment, and amount of disinfectant used.
Health risks from exposure to low levels of DBPs are not well understood. Some studies suggest that DBP exposure may increase the risk of bladder and colorectal cancers and reproductive and developmental health effects.
Drinking Water Disinfection By-Products, Number of Community Water Systems with MCL Violations, 1999-2007
Data NotesNew or more stringent MCLS for DBPs were phased in between 2003 and 2005. The MCL for total trihalomethanes was lowered from 100 micrograms per liter to 80 micrograms per liter, and a new MCL for haloacetic acids was established at 60 micrograms per liter. Data are presented for community water systems that reported test results for the specified time interval. There are over 600 community water systems in New Jersey.
Data SourcesNew Jersey Department of Environmental Protection, Bureau of Safe Drinking Water;
Other Graphical Views
DefinitionThe distribution of disinfection by products (total trihalomethane and haloacetic acid) in drinking water by community water system, population served, and year
How We Calculated the Rates
Page Content Updated On 02/04/13, Published on 02/04/13