Confluence Engineering Group, LLC

Confluence addresses corrosion and metals release across a wide range of projects, from prevention and mitigation of discolored water events to process selection for optimal corrosion control under the US EPA Lead and Copper Rule. Desktop modeling and field protocols are developed to evaluate risks associated with new water-supply introduction, supply blending, changes in treatment practices, and shifts in secondary disinfectant residuals. Microbial, chemical, and physical factors are considered when diagnosing water quality issues and selecting corrosion control parameters.

Confluence develops and implements engineered main cleaning programs for drinking water distribution systems. Work combines desktop modeling, field protocols, pilot studies, bench-scale studies, and monitoring plan implementation, addressing sediment accumulation, legacy pipe deposits, supply integration, and distribution system water quality control. Programs are delivered alongside utility operations crews, with field training support included.

Confluence conducts bench-scale and pilot-scale filtration and treatment studies to support process evaluation and selection for drinking water systems. Studies encompass water quality data analysis, applied research, and field investigations, providing utilities with research-backed guidance for treatment improvement and optimization.

Confluence staff author and contribute to industry guidance documents and peer-reviewed research for the drinking water sector. Published work covers corrosion control, distribution system best practices, water quality asset management, and Legionella risk management, supporting regulatory development and utility practice across North America.

Confluence works with building owners on water quality management for building plumbing systems, with a focus on identifying and controlling Legionella and other waterborne risks. Services span risk assessment, water management plan development, and implementation support. Alex Mofidi leads the practice and has contributed to the development of current industry guidance on Legionella management best practices.

• Legionella Risk Management

  Legionella risk assessments and water management plan development for building plumbing systems, designed in accordance with current regulatory requirements and industry best practices for controlling Legionella growth and transmission.

Confluence provides PFAS monitoring and assessment services to drinking water utilities, covering monitoring program design, water sampling, data interpretation, and evaluation of regulatory compliance options. Chris McMeen, who brings 30 years of leadership in water utility management across private and public organizations, leads the program.