Princeton Hydro, LLC

Inspired by Nature. Engineered with Science.

Website

About the firm

Founded in 1998, Princeton Hydro provides environmental and water resources engineering services, specializing in nature-based solutions for watershed management and ecological restoration. With offices across multiple states, the practice has led more than 10,000 water resource projects for over 2,000 clients, including municipalities, NGOs, and government agencies. It integrates ecological and engineering consulting services, natural resource management, geosciences, landscape architecture, and regulatory compliance from concept through construction.

Established
1998
Team
Midsize
Firm type
Environmental Engineering · Water / Wastewater Engineering · Landscape Architecture · Geotechnical Engineering

Credentials

Certified Ecological Restoration Practitioner (CERP) · Certified Floodplain Manager (CFM) · GIS Professional (GISP) · Professional Wetland Scientist (PWS) · Certified Lake Manager (CLM) · Certified Professional in Erosion and Sediment Control (CPESC) · Registered Landscape Architect (RLA) · Professional Landscape Architect (PLA) · Professional Engineer (PE)

People

Geoffrey M. GollPE, President and Founding Principal

Mark GallagherVice President and Founding Principal

Megan Hunter RufChief Operating Officer

Samara McAuliffeChief People Officer

Fred S. LubnowPhD, Senior Technical Director, Ecological Services

Christiana L. PollackCERP, CFM, GISP, Director of Restoration and Resilience

Michael C. RehmanCERP, PWS, Director of Regulatory Compliance and Wildlife Surveys

Christopher L. MikolajczykCLM, Senior Manager, Aquatics

Capabilities

Water Resources Engineering

Service website

Conducts hydrologic and hydraulic analysis, flood modeling, dam inspection and removal, and stormwater management design to protect and restore watershed systems.

  • Stormwater Management and Green Infrastructure Design

    Designs eco-friendly systems to handle stormwater runoff and filter pollutants.

  • Flood Modeling and Floodplain Analysis

    Utilizes advanced modeling tools to evaluate flood risk and inform resilient design.

  • Dam Inspection, Design, and Removal

    Evaluates dam safety and manages complete decommissioning and removal projects.

  • Culvert Restoration and Aquatic Organism Passage

    Restores stream connectivity and facilitates aquatic organism passage under roadways.

Wetland and Stream Restoration

Service website

Delivers science-based designs and construction oversight for ecological systems, stabilizing banks and creating self-sustaining aquatic habitats.

  • Wetland Delineation, Creation, and Restoration

    Identifies wetland boundaries and designs custom ecosystems to revive ecological function.

  • Stream Bank Stabilization and Erosion Control

    Employs bioengineering methods to prevent erosion and stabilize riparian corridors.

  • Riparian Buffer Restoration

    Re-establishes native vegetation zones to filter runoff and enhance riverine habitats.

  • Living Shoreline Design

    Creates natural, resilient coastal and lakeside protections using native plants and organic materials.

Nature-Based Design and Resiliency

Service website

Develops adaptive strategies and designs to reduce flood risk, improve community resilience, and restore native habitats.

  • Climate Change Vulnerability Assessments

    Evaluates potential environmental risks to infrastructure and ecosystems under shifting climate patterns.

  • Nature-Based Resiliency Planning

    Integrates ecological principles into municipal and regional master plans.

  • Native Meadow and Habitat Restoration

    Establishes native wildflower and grass communities to boost biodiversity and soil health.

Green Infrastructure and Stormwater Management

Service website

Designs and plans green stormwater systems to improve water quality and satisfy municipal compliance requirements.

  • Green Stormwater Infrastructure Design

    Develops bioswales, rain gardens, and bioretention systems to manage urban runoff.

  • Stormwater Nutrient Reduction

    Implements targeted solutions to capture and filter out pollutants and excess nutrients.

  • Harmful Algal Bloom Assessment and Management

    Diagnoses the drivers of hazardous blooms and deploys preventative treatments.

Pond and Lake Management

Service website

Assesses aquatic ecosystems and implements targeted monitoring and restoration plans to protect freshwater resources.

  • Lake and Pond Water Quality Monitoring

    Performs regular chemical and biological testing to track ecological health.

  • Aquatic Invasive Species Management

    Controls non-native weeds and pests to maintain balanced aquatic biodiversity.

  • Lake Restoration and Nutrient Reduction

    Mitigates eutrophication and improves clarity through watershed-scale management.

Natural Resources and Landscape Architecture

Service website

Performs biological surveys and designs aesthetic, functional landscapes utilizing native plantings.

  • Ecological Field Surveys and Inventories

    Documents existing flora, fauna, and environmental constraints on site.

  • Threatened and Endangered Species Surveys

    Conducts targeted searches for protected species to support project permitting.

  • Native Plant Landscape Architecture

    Develops planting schemes that minimize runoff, attract pollinators, and blend with natural surroundings.

Regulatory Compliance

Service website

Navigates complex environmental permitting requirements at local, state, and federal levels to ensure project alignment.

  • Wetland and Stream Permitting

    Secures necessary environmental approvals from state agencies and federal entities.

  • Environmental Risk Analysis

    Evaluates potential project impacts and guides developers through mitigation processes.

  • MS4 Stormwater Compliance Support

    Assists municipal clients in meeting state-mandated stormwater discharge regulations.

Geosciences and Soils Lab

Service website

Conducts geotechnical investigations and laboratory soil testing to support engineering designs and environmental projects.

  • Geotechnical Investigation and Soil Analysis

    Analyzes physical properties of soils to determine structural load capacity and stability.

  • Soils Laboratory Testing

    Performs specialized testing of soil matrices to verify composition and permeability.

Industries

Government · Environmental & Remediation · Federal · Education · Residential · Land Development · Parks & Open Space · Water Resources · Stormwater & Flood Control

Projects

Lion's Pride Park Restoration

Pennsylvania · Parks & Open Space · 2025

Project details

An ecological restoration and park revitalization project that won the 2025 Governor's Award for Environmental Excellence.

Musconetcong Island Park

Bethlehem Township, NJ · Parks & Open Space · 2024 · Client: Musconetcong Watershed Association

Project details

Transformation of an abandoned concrete block laboratory into an accessible riparian park for fishing, wading, paddling, and hiking.

Paulina Lake Dam Removal

Water Resources · 2026

Project details

A dam removal and restoration project documented as a before-and-after study on the blog.