New Online Tool for Stage 2 DBP Compliance
(NEW YORK, NY – June 6, 2013) – In collaboration with the Water Research Foundation, Hazen and Sawyer developed a definitive, understandable, and results-oriented guidance manual and associated web tool to help small and medium-sized utilities cost-effectively comply with the new Stage 2 D/DBPR.
Since their discovery in the 1970s, disinfection byproducts have been a major concern for regulators, drinking water utilities, and the public due to their carcinogenicity and other potential health effects.
Several iterations of disinfection byproduct (DBP) regulations have been implemented over the past three decades. The latest regulation, the Stage 2 Disinfectant / Disinfection Byproduct Rule (D/DBPR), maintains existing maximum contaminant levels (MCLs) of 80 ?g/L for total THMs and 60 ?g/L for the sum of five HAAs from the Stage 1 D/DBPR, but focuses on a locational running annual average (LRAA) instead of a system-wide annual average, resulting in effectively stricter limits for many utilities of all sizes.
While most large systems are generally well prepared for Stage 2 D/DBPR compliance, many small and medium systems have yet to fully address the various changes in treatment and management practices that may be necessary to meet the new requirements. There are numerous reports and extensive guidance manuals related to dealing with the Stage 2 D/DBPR, but these individual documents do not focus on the needs of small- and medium-sized systems.
The resources developed as part of this project will provide direction for complying with the Stage 2 D/DBPR by offering simple step-by-step approaches that enable utilities to:
- Evaluate their potential compliance status relative to specific compliance goals.
- Assess more than 20 potential DBP reduction strategies.
- Compare DBP reduction strategies by using system-specific information to estimate the DBP reduction percentage from each strategy as well as the associated cost of implementation.
Some utilities may prefer the traditional manual/worksheet approach while others may prefer the online tool that streamlines data entry, calculations, and compilation of results. Both user-friendly tools can help utilities work through the decision-making process and provide them with specific options based on their system characteristics.
The online tool also provides outputs from calculation results and generates associated plots and charts that can help with visualizing data trends. System-specific data entered by the user – along with questionnaire answers – populate an interactive table of DBP reduction alternatives and their expected result (shown above). The user can click on alternatives or combinations of alternatives in order to tally percent DBP reductions and costs for the selected options. This allows the user to easily compare the possible reduction in DBPs and costs of a variety of different possible combinations of compliance alternatives.
The online tool can be found here. Additionally, Erik Rosenfeldt and Bill Becker of Hazen and Sawyer will hold a discussion session and tool demonstration at WaterRF’s ACE Booth (#3046) on Wednesday, June 12 from 11 am–12 noon.
Since our founding in 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution. Our range of services encompasses the planning, design, and construction management of water and wastewater-related projects – from clean water treatment, storage, and distribution to wastewater and stormwater collection, treatment, and reuse.