Since 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution.
Upgrades to the 60-mgd Neuse River Wastewater Treatment Plant included facilities for total nitrogen removal and UV disinfection - and a 20% reduction in energy costs.
As part of the Bogotá River Environmental Restoration Project, we’re upgrading the Salitre Wastewater Treatment Plant to secondary treatment while doubling its capacity.
Upgrades to the Arlington East WRF are operating even better than expected, and were completed four months ahead of schedule and $10 million under budget.
Upon completion, the 2,020-mgd Catskill Delaware Ultraviolet Disinfection Facility will be the largest drinking water UV installation in the world.
The first of its kind, our study comprehensively examined the potential benefits and drawbacks of natural gas development in the Catskill/Delaware watershed.
The T.P. Smith Water Reclamation Facility meets a total nitrogen limit of 3 mg/L thanks to Biowin and CFD modeling, and accommodates overhead flight paths thanks to 3D CAD.
Best Management Practices replace expensive storm sewers in the Staten Island Bluebelt, saving NYC millions and creating beautiful natural wildlife habitats.
Facing a steep increase in energy prices, Johannesburg Water is upgrading to high-performance digestion facilities, cutting costs as much as 55%.
Innovative optimization of disinfection at the Conner Creek CSO Control Facility reduced expected construction costs by more than $330 million.
The LEED certified Bradley Avenue Water Treatment Plant was delivering water 21 months from project start.
Flexible facility design - accommodating a variety of supplemental carbon sources - can greatly reduce operating costs, mitigating market volatility and safety concerns.
Our Enhanced Nutrient Removal upgrade and expansion of the 75-mgd Henrico Water Reclamation Facility includes flexibility to meet lower limits as regulations evolve.
Our innovative roller compacted concrete design for the Buckhorn Dam has proved more economical and effective for stream diversion purposes than customary design.
Our design for the 30-mgd Nansemond Wastewater Treatment Plant tripled capacity and added an advanced 5-stage BNR treatment process.
Upgrades to the 86-mgd E.M. Johnson Water Treatment Plant include UV disinfection and accommodate further expansion to ion exchange or granulated activated carbon adsorption.
The Paerdegat Basin CSO facilities will serve a tributary population of 500,000 and will receive CSO from a drainage area of approximately 6,000 acres.
Hazen and Sawyer is developing the treatment process, and is involved in developing the regulatory standards, for 21 mgd of recharge to Florida's Biscayne Aquifer.
The San Cristobal (Dominican Republic) Water Treatment Plant was online 24 months from project start.
Our work for the 15-mgd Moores Creek WWTP included upgraded treatment facilities for enhanced nutrient removal and the beneficial utilization of digester gas.
We’re working to identify the ideal treatment technologies and location for a new wastewater treatment plant in Dakar, Senegal.
Process optimization at the North Regional Wastewater Treatment Plant will help Broward County (FL) reduce nutrient mass loadings to the ocean.
UCONN's award-winning wastewater reuse program both will ease demands on precious potable water supplies and reduce wastewater discharge to local waterbodies.
Improvements to Mill Pond include constructed wetlands and other features that provide natural drainage while promoting terrestrial and aquatic life.
We served as the lead firm for this USAID-funded project, providing final design to restructure nearly half of Amman’s water distribution system and construction management of these projects.
Rehabilitation of the Gilboa Dam, constructed in the 1920s, will improve NYC's water supply reliability.
Hydraulic models predict pressures, identify bottlenecks, and demonstrate the effectiveness of proposed solutions - minimizing the cost of improvements.
We see “sustainability” as the confluence of technical performance and the best possible of social, environmental, and economic outcomes.
From LEED and LID to reuse and waste-to-energy programs, we have sustainable solutions to optimize your project's footprint.
We are always looking for bright, passionate people who want a rewarding career managing the planet’s most precious resource.
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