Hazen and Sawyer is a leading environmental engineering and water management consulting firm established in 1951 that specializes in planning, designing, and overseeing construction of water, wastewater, and stormwater infrastructure systems. The company serves public and private clients globally, providing technical solutions for water quality, water supply, and environmental protection challenges. As an employee-owned firm with over 2,300 employees across 80+ offices, Hazen and Sawyer has built a reputation for delivering sustainable, client-focused environmental infrastructure solutions backed by extensive applied research capabilities.

Products & services

Hazen-Adams CyanoTOX Tool A digital twin model for simulating cyanotoxin removal in drinking water treatment plants to evaluate treatment scenarios and optimize plant performance.
Reservoir Risk Management and Design Engineering design and management services for reservoirs to optimize water storage, control seepage, and maintain structural integrity.
TDS and nbDON Management at Water Resource Reclamation Facilities Consulting and engineering strategies to control total dissolved solids (TDS) and non-biodegradable dissolved organic nitrogen (nbDON) in wastewater treatment and reuse systems.
Stormwater and Sewer System Flood Modeling and Visualization Development of dynamic 2D models and interactive visualization tools to predict and communicate flood inundation from extreme storm events in urban sewer and stormwater systems.
Ballasted Settling Process Optimization Process optimization service using bentonite addition to improve settling capacity in wastewater treatment clarifiers during wet weather flows.
Direct Potable Reuse (DPR) Blending Consulting Engineering and operational consulting to address water quality and system stability challenges when blending direct potable reuse water into existing drinking water systems.

Leadership

Alfred Sawyer Founder
Richard Hazen Founder
David Jao Chief Technology Officer, Business and Technology Planning, and Blending IT…
William Crayon Chief Financial Officer

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