What are the monitoring requirements for DBPs?
All community water systems that disinfect their water (i.e., all surface water and some groundwater systems) are required to monitor for DBPs in the distribution system. Monitoring requirements and the number of samples a system collects varies based on source water type, chlorine treatment type, the number of treatment plants, historical DBP levels, and the size of the population served. Typically, systems with a single treatment plant monitor quarterly at four locations in the distribution system and report the results of samples, quarterly averages, and an annual running average.
