The upcoming Stage 2 Disinfectants and Disinfection Byproducts Rule (DBPR) will
require Community Water Systems (CWSs) to conduct an Initial Distribution System
Evaluation (IDSE). The IDSE is intended to select new compliance monitoring sites
within the water distribution system that more accurately reflect sites representing high
TTHM and HAA5 levels than those sites currently used for compliance. They will be
based either on system specific monitoring or other system specific data that provides
equivalent or better information on site selection. Systems will recommend new or
revised monitoring sites to their State/Primacy Agency based on their IDSE study.
As utilities prepare for the Stage 2 DBPR, all options for conducting the IDSE should
be considered. Utilities may conduct a Standard Monitoring Program as outlined in the
IDSE guidance. This process involves sampling at several new distribution system
monitoring locations in addition to current compliance monitoring locations every two
months over the course of one year. In lieu of conducting a Standard Monitoring
Program to identify distribution system locations with high DBP levels, the Rule also
allows for System Specific Studies. In these studies, systems may perform an IDSE
study based on other system specific monitoring or system specific data that will provide
comparable or superior selection of new monitoring sites that target high DBP levels.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 89 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 1 |
