Confluence is a world-class drinking water quality firm focused on providing clients exceptional water quality engineering, planning, and applied research services. Co-founded in 2008 by our President Melinda Friedman, P.E., and COO Michael Hallett, we offer unparalleled technical services for management, operations, and regulation of drinking water systems.  Located in Seattle, Washington, Confluence is a small and flexible woman-owned engineering firm positioned to efficiently and cost-effectively provide personalized, high-quality services around the world that are tailored specifically to our clients’ water quality needs.

We specialize in drinking water quality issues of all kinds, with the following specialty areas of coverage:

- Bench/Pilot treatment and distribution system testing,
- Corrosion control, especially for lead and copper compliance,
- Surface and groundwater treatment proces optimization and selection,
- All levels of distribution systems mains cleaning (flushing, swabbing),
- Risk minimization/mitigation for integration of new water sources,
- Building water quality risk management planning (minimization of Legionella, Pseudomonas, Lead, others),
- Risk and resiliency assessments,
- Distribution system iron and manganese management and risk mitigation,
- Improving customer drinking water aesthetics such as taste, odor, and color,
- Secondary disinfection optimization (chloramines, nitrification control, others).

Confluence Engineering Group LLC

Melinda Friedman

This department oversees project planning, execution, and successful delivery while ensuring alignment with organizational goals.

Confluence Engineering Group LLC

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