Water and Wastewater Treatment

Water and Wastewater Treatment

Water/Wastewater Treatment and Reuse

Freese and Nichols helps communities plan, design and deliver water purification, wastewater treatment, resource recovery and reuse solutions that protect public health, strengthen infrastructure resiliency and support long-term growth. We serve municipal, state and federal clients across the United States, providing planning, design, and construction phase services, program management, process troubleshooting, and startup and commissioning support for advanced treatment facilities.

Our treatment experience spans projects that collectively provide billions of gallons per day in capacity for our clients. From early planning studies through plant design and implementation, our teams bring practical innovation, regulatory understanding and operator-focused solutions to complex water and wastewater challenges. Our approach emphasizes making the most of existing treatment assets by optimizing performance, uprating infrastructure, extending service life, and planning timely, right-sized expansions that maximize ratepayer value and improve resilience.

Treatment has been central to Freese and Nichols since 1894, and it was one of the original services offered by our founders Major John Hawley, Simon Freese and Marvin Nichols. Today, our nationally recognized specialists continue that legacy with a commitment to technical excellence, quality and outstanding client service.

Explore our water and wastewater treatment services below.

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Specific Services

Water Purification (Water Treatment)

Facility optimization, uprating, condition/capacity evaluations
Hydraulic improvements and modeling
Bench and pilot scale studies
Indirect/direct potable reuse for water supply augmentation
Brackish groundwater and seawater desalination
Conventional and advanced groundwater & surface water treatment
Low-pressure and high-pressure membrane filtration and optimization
Chlorine, chloramine, ozone and UV disinfection

Advanced oxidation
Chemical and energy optimization
Disinfection byproduct control
Distribution system water quality
Lead and copper rule compliance
Enhanced coagulation and sedimentation
Chemical feed and scrubbers
Softening, lime addition and recarbonation
Taste and odor control
Water supply and source water protection
PFAS treatment and micropollutants

Resource Recovery (Wastewater Treatment)

Facility planning, condition/capacity assessments and process modeling
Water reclamation and reuse
Conventional activated sludge and high rate activated sludge systems
Process intensification technologies (e.g. IFAS, MBR, granular activated sludge)
Biological and chemical phosphorus removal
Total nitrogen removal
Aeration and blower optimization
Headworks, coarse and fine screening, and grit removal
Wastewater pumping systems
Primary clarification and high-rate primary treatment
Secondary clarification

Cloth media and conventional filtration

Chlorine, UV and hypochlorite disinfection
Anaerobic treatment and digestion
Aerobic digestion
Biosolids master planning, regulations and residuals management
Biosolids dewatering and drying
Class A biosolids treatment
Energy conservation and recovery
Industrial pretreatment and technically based local limits
Wet weather flow management, storage and treatment
Plant upratings and expansions
PFAS treatment and emerging contaminants

Project Gallery

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Catawba River Water Pollution Control Facility

City of Morganton, North Carolina

Etowah River Water Treatment Plant Evaluation and Plate Settler Design

Cherokee County Water and Sewerage Authority, Georgia

Southwest Water Reclamation Facility Influent Pump Station and Headworks Odor Control

City of St. Petersburg, Florida

Village Creek Water Reclamation Facility Biosolids Management and Beneficial Reuse

City of Fort Worth, Texas

Expansion of the Auger Water Treatment Plant to 12 MG

Expansion of the Auger Water Treatment Plant to 24 MG

City of Midlothian, Texas

Indirect Potable Reuse

City of Cleburne, Texas

Phase I PFAS Treatment Pilot Study

Columbus Water Works, Georgia

Holly Water Treatment Plant Expansion

City of Fort Worth, Texas

Ray Roberts Water Treatment Plant Re-Rate and Performance Improvements

City of Denton, Texas

Lick Creek Wastewater Treatment Plant Capacity Expansion

City of College Station, Texas

Wastewater Treatment Plant Expansion

City of Cleburne, Texas

Central Wastewater Treatment Plant Expansion

City of Pflugerville, Texas

Allison Wastewater Treatment Plant Nitrification Study

Allison WWTP IFAS Process Intensification

City of Corpus Christi, Texas

Village Greek Water Reclamation Facility Thickening Study & Modifications

Village Creek Water Reclamation Facility Thickening Study and Modifications

City of Fort Worth, Texas

Phase 1C Water Treatment Plant Expansion and Zebra Mussel Control

Brushy Creek Regional Utility Authority, Texas

Wylie Water Treatment Plant Power System Improvements

Wylie Water Treatment Plant Risk-Based Renewal CIP

North Texas Municipal Water District

Water/Wastewater Treatment and Reuse