Which regulation addresses backwash water recycling in filtration plants?

• A. Interim Enhanced Surface Water Treatment Rule
• B. Surface Water Treatment Rule
• C. Filter Backwash Recycle Rule
• D. Total Coliform Rule

Answer: (C)

Backwash water recycling in filtration plants is regulated by the Filter Backwash Rule. This regulation specifically addresses how backwash water generated during filter cleaning can be recycled or disposed of, setting safeguards to prevent contaminants from re-entering the finished water. It recognizes that backwash can contain solids and microbes, so it outlines when recycling is allowed and what treatment or disinfection steps must accompany it, along with any required monitoring. In contrast, the Interim Enhanced Surface Water Treatment Rule and the Surface Water Treatment Rule focus on removing pathogens from source water through treatment, not on how backwash water is handled. The Total Coliform Rule deals with monitoring bacteria in the distribution system and does not cover backwash recycling practices.