Sanitary Sewer

Sanitary Sewer

Walden provides a variety of services for the development and upgrade of wastewater systems including but not limited to design collection systems and pumping stations, treatment systems, water quality, water safety, wastewater permitting and many types of water-related compliance concerns every day.  Our experience and knowledge makes us the best-equipped team to tackle the most challenging water problems. We are staffed with highly experienced civil and environmental engineers, geologists, and scientists who have the knowledge and skill to help our clients move forward in a cost-effective manner. By hiring Walden, you can increase the confidence that your customers, clients, elected officials and other stakeholders will have in your wastewater operations.

Walden’s Sanitary Sewer Services are listed below:


  • Resource Recovery and Waste to Energy
  • Remaining Capacity Studies
  • Failed and Failing Septic System Abatement
  • Nonpoint Pollution Identification and Abatement
  • Grant Writing and Administration
  • Control System Evaluation and Design
  • Condition assessments/audit
  • SSES investigations
  • Inflow/infiltration analysis
  • SSO/CSO evaluation/elimination
  • Sewershed studies
  • Subsurface disposal systems
  • Subsurface utility engineering
  • Sludge treatment and disposal
  • Industrial pretreatment
  • Enhanced nutrient removal upgrades
  • Regulatory strategies and negotiations
  • NPDES permitting


Wastewater Treatment Plant Upgrade and Repair, Suffolk County, New York

Walden evaluated the condition of this tertiary wastewater treatment plant which discharged treated wastewater to groundwater and featured denitrification filters. Walden prepared a detailed report along with a prioritized list of upgrade/replacement recommendations. Read more

Wastewater Treatment Plant Design, Defense Facility

Walden’s Principal designed a tertiary domestic wastewater treatment facility designed to handle daily sanitary wastewater flow from 4,800 employees at this defense plant. Work involved design of pumping systems, aeration systems, chemical feed systems, emergency generator system and layout of office, electrical, and mechanical and laboratory rooms. Read more