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Water Environment Solutions

Since 1951, Hazen and Sawyer has focused on two things: providing safe drinking water and controlling water pollution.
Upgrading Treatment, Lowering Costs

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.

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Revitalizing Water Environments

As part of the Bogotá River Environmental Restoration Project, we’re upgrading the Salitre Wastewater Treatment Plant to secondary treatment while doubling its capacity.

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Award-winning BNR Upgrades

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.

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Designing at the Largest Scales

Upon completion, the 2,020-mgd Catskill Delaware Ultraviolet Disinfection Facility will be the largest drinking water UV installation in the world.

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The Threat from Hydrofracking

The first of its kind, our study comprehensively examined the potential benefits and drawbacks of natural gas development in the Catskill/Delaware watershed.

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BIM and Process Modeling a WWTP

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.

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Making an Asset of Stormwater

Best Management Practices replace expensive storm sewers in the Staten Island Bluebelt, saving NYC millions and creating beautiful natural wildlife habitats.

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Harvesting Biogas for Electricity

Facing a steep increase in energy prices, Johannesburg Water is upgrading to high-performance digestion facilities, cutting costs as much as 55%.

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Building a Better Mousetrap

Innovative optimization of disinfection at the Conner Creek CSO Control Facility reduced expected construction costs by more than $330 million.

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High-Efficiency Design/Build

The LEED certified Bradley Avenue Water Treatment Plant was delivering water 21 months from project start.

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Finding Flexibility in Carbon Supplementation

Flexible facility design - accommodating a variety of supplemental carbon sources - can greatly reduce operating costs, mitigating market volatility and safety concerns.

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Forward-Looking Regulatory Compliance

Our Enhanced Nutrient Removal upgrade and expansion of the 75-mgd Henrico Water Reclamation Facility includes flexibility to meet lower limits as regulations evolve.

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Reliable Supply Management

Our innovative roller compacted concrete design for the Buckhorn Dam has proved more economical and effective for stream diversion purposes than customary design.

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Strategic Upgrade and Expansion

Our design for the 30-mgd Nansemond Wastewater Treatment Plant tripled capacity and added an advanced 5-stage BNR treatment process.

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Designing for the Future

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.

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Preserving Water Quality in Wet Weather

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.

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Innovative Aquifer Recharge

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.

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Safe Water for Expanding Communities

The San Cristobal (Dominican Republic) Water Treatment Plant was online 24 months from project start.

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Capitalizing on Process By-Products

Our work for the 15-mgd Moores Creek WWTP included upgraded treatment facilities for enhanced nutrient removal and the beneficial utilization of digester gas.

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Upgrading Infrastructure, Protecting Health

We’re working to identify the ideal treatment technologies and location for a new wastewater treatment plant in Dakar, Senegal.

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More Efficient Nutrient Removal

Process optimization at the North Regional Wastewater Treatment Plant will help Broward County (FL) reduce nutrient mass loadings to the ocean.

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Addressing the Water/Energy Nexus

UCONN's award-winning wastewater reuse program both will ease demands on precious potable water supplies and reduce wastewater discharge to local waterbodies.

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Sustainable Stormwater Management

Improvements to Mill Pond include constructed wetlands and other features that provide natural drainage while promoting terrestrial and aquatic life.

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Reducing Water Losses

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.

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Preserving Vital Infrastructure

Rehabilitation of the Gilboa Dam, constructed in the 1920s, will improve NYC's water supply reliability.

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Cost-Effective Infrastructure Upgrades

Hydraulic models predict pressures, identify bottlenecks, and demonstrate the effectiveness of proposed solutions - minimizing the cost of improvements.

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