Abstract
In the early 1980's, New Jersey‐American Water Company experienced coliform bacteria in its water distribution network in Monmouth County. The company was doing everything by the book and was considered a well‐run water system, yet it had coliforms at points in its distribution as high as 600/100 mL. There appeared to be no external cause for this regrowth. An intensive research program discovered that the organisms were thriving in biofilms attached to the inside of the pipes. This article discusses biofilms and regrowth, strategies for their prevention, complications in testing, disinfectant control of microbes, switching to chloramines, problems with chloraminated systems, corrosion control, whole‐system management, and how joining the Partnership for Safe Drinking Water can reduce the potential for distribution regrowth problems.
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