Hazen and Sawyer

What Hazen and Sawyer does

Hazen and Sawyer is a privately held environmental engineering consultancy founded in 1951, headquartered in New York City, with regional offices across the United States including Raleigh, Boston, Boise, Wilmington, and a Pacific Northwest presence. The firm specializes in drinking water treatment, wastewater treatment, water reuse, and water resources engineering, serving primarily municipal water utilities and government agencies (LACSD, NYC DEP, Fairfax County, Loudoun Water, City of Edmonds) and secondarily industrial clients. Engagements span planning, process design, construction administration, and regulatory compliance, with deep expertise in biological nutrient removal, biosolids management, and emerging contaminant treatment (PFAS, HAA).

The firm's technical portfolio combines traditional engineering consulting with proprietary treatment technologies and digital tools. Core offerings include the AquaNereda® aerobic granular sludge system (partnered with Aqua-Aerobic Systems), N-PRIME nutrient removal (with Current Innovation NFP and University of Minnesota), HPOLE nitrogen removal for water reuse, CFD modeling for clarifier optimization, and emerging gasification/pyrolysis and supercritical water oxidation for biosolids (partnered with Ecoremedy). Digital assets include the OASIS Water Resources System Modeling platform and a Remote Sensing-Water Quality Decision Support System, both leveraging NASA Earth observation data. Recent additions include the January 2026 acquisition of Water Quality Treatment Solutions (WQTS) and partnerships with NASA WWAO and multiple universities.

Hazen and Sawyer operates a professional services revenue model, generating fees from project-based engineering consulting engagements with quote-based, scope-tied pricing. The firm is privately held as a professional corporation (DPC), employs between 1,001 and 5,000 people, and pursues sales through direct client engagement supported by thought leadership content (Horizons publication), conference participation (WEFTEC, WateReuse, Texas Water, CWEA), and long-term institutional relationships rather than digital channels or intermediaries.

Name

Hazen and Sawyer

Legal name

Hazen and Sawyer, DPC

Website

https://hazenandsawyer.com

Company type

Private

Founded year

1951

Operating status

Operating

Headcount range

1,001–5,000 employees

Short description

Hazen and Sawyer is a privately held environmental engineering consultancy founded in 1951, providing drinking water, wastewater, reuse, and water resources engineering services to municipal utilities and government agencies across the United States.

Ownership category

akta.pro rank

Product category

Environmental Engineering Services

NAICS

Environmental Consulting Services (541620), Environmental Consulting Services (54162), Remediation Services (562910)

SIC

Services-Commercial Physical & Biological Research (8731), Services-Testing Laboratories (8734), Water Supply (4941)

akta.pro primary industry

Water, Wastewater & Stormwater Compliance (BPAHAJAJ)

akta.pro secondary industries

Water & Wastewater Compliance (NPDES/Stormwater, Pretreatment, Drinking Water/SDWA) (EUAHABAB), Groundwater Extraction, Treatment & Discharge (Pump-and-Treat, reinjection) (BPALAKAF), PFAS & Emerging Contaminants Treatment Services (IMAIAGAJ)

Keywords

• Water engineering consulting
• Wastewater treatment design
• Drinking water treatment
• Environmental engineering services
• Water resources planning

Headquarters

HQ city

New York

HQ country

United States

HQ region

North America

Offices6 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

Personnel, Operations, Technology or R&D, Marketing or Sales, Infrastructure

Revenue model

1. Engineering Consulting Services: Professional consulting fees generated from water and wastewater engineering design projects, master planning, process optimization, and environmental consulting engagements with municipal and industrial clients.

Go-to-market motion1 record

Distribution channels1 record

Marketing channels6 records

Core offering

Hazen and Sawyer is an environmental engineering consulting firm that plans, designs, and supports construction of drinking water, wastewater, water reuse, and water resources infrastructure for municipal, regional, and industrial clients. The firm delivers specialized services including treatment process design, hydraulic and water quality modeling, biosolids and residuals management, and asset management for water and wastewater utilities. Its offering combines traditional civil and environmental engineering with proprietary modeling tools (e.g., OASIS, CFD) and advanced treatment technologies (e.g., AquaNereda, MBR, SCWO).

Product overview

Hazen and Sawyer is an environmental engineering firm specializing in water, wastewater, reuse, and water resources solutions. The company provides a comprehensive portfolio of engineering services, proprietary methodologies, and specialized technologies rather than a unified software product. Key offerings include: (1) treatment technologies such as AquaNereda® for aerobic granular sludge, membrane bioreactor systems, supercritical water oxidation, and gasification/pyrolysis for biosolids; (2) proprietary software platforms including OASIS for water resources modeling and a Remote Sensing-Water Quality Decision Support System; (3) specialized methodologies like LEAF (Leverage Existing Assets First) for facility optimization, HPOLE for nutrient removal, and CFD modeling for clarifier analysis; and (4) digital solutions including DataTech services and real-time monitoring dashboards. The company partners with technology providers like Aqua-Aerobic Systems, Inc. and Ecoremedy to deploy these solutions across water and wastewater facilities.

Differentiator

Problem solved

Functional benefit

Products and services

• Drinking Water Treatment Engineering Planning, process design, and construction-phase engineering services for drinking water treatment plants and source water infrastructure, delivered for municipal and industrial clients.
• Wastewater Treatment Engineering Planning, process design, and construction-phase engineering services for municipal and industrial wastewater treatment facilities, including advanced treatment processes.
• Water Reuse Engineering Consulting and engineering services for water reuse and reclamation projects, including reuse permitting support, treatment process design, and integration with existing water and wastewater infrastructure.
• Water Resources Planning and Modeling Water resources system planning and modeling using OASIS and CFD tools, including supply/demand studies, integrated water resources planning, and hydraulic and water quality analysis.
• Stormwater Management Engineering Planning and design services for municipal stormwater management, including green infrastructure, flood mitigation, and stormwater quality programs.
• Biosolids and Residuals Management Engineering services for biosolids treatment, residuals handling, and resource recovery, including gasification, pyrolysis, and supercritical water oxidation process integration.
• Asset Management for Water and Wastewater Utilities Asset management consulting for water and wastewater utilities, including condition assessment, risk-based prioritization, and capital improvement planning.
• Construction Management Services

Named customers6 records

Segments2 records

Ideal customer profiles2 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Feature4 records

Partnerships

Eight partnerships are on record, tiered core and minor.

• Aqua-Aerobic Systems, Inc.coreTechnology or IntegrationPartnership for AquaNereda technology deployment - an advanced biological nutrient removal system for wastewater treatment applications. The collaboration enables Hazen to offer cutting-edge treatment technology solutions to municipal clients.
• EcoremedycoreStrategic or Co-development PartnerStrategic research partnership focused on gasification and pyrolysis technologies for biosolids management and energy recovery. Joint development of innovative solutions for sustainable waste-to-energy applications.
• Current Innovation NFPcoreStrategic or Co-development PartnerPartnership with Current Innovation NFP and University of Minnesota for the N-PRIME technology - an advanced biological nutrient removal process for wastewater treatment.
• University of MinnesotacoreStrategic or Co-development PartnerAcademic research partnership for N-PRIME technology development - an advanced biological nutrient removal process for wastewater treatment, in collaboration with Current Innovation NFP.
• Water Research FoundationminorStrategic or Co-development PartnerResearch collaboration and funding partner supporting development of innovative water treatment technologies and research initiatives. Hazen contributes expertise and receives access to cutting-edge research findings.
• Manhattan CollegeminorOthersAcademic research partnership for collaborative research and development in water and environmental engineering.
• University at BuffalominorOthersAcademic research partnership for collaborative research and development in water and environmental engineering.
• Mostardi PlattminorOthersEnvironmental testing and air sampling services provider supporting compliance monitoring and environmental assessment projects.

Scale indicators1 record

Recent moves6 records

Expansion highlights6 records

Direct peers

• Brown and Caldwell: Closest comparable: a privately held US engineering firm of similar scale focused exclusively on water, wastewater, and environmental services for municipal and industrial clients. Competes head-to-head with Hazen on most major municipal accounts.
• Carollo Engineers: Large privately held US engineering firm entirely focused on water and wastewater planning, design, and construction management. Directly competes on municipal water utility engagements and biological treatment work.
• Black & Veatch: Employee-owned global engineering, procurement, and construction firm with a large water practice serving municipal and industrial clients. Overlaps with Hazen on treatment plant design, nutrient removal, and biosolids.
• CDM Smith: Large privately held engineering and construction firm with a substantial water and environment practice serving utilities and government. Comparable in scale and service mix on municipal water work.
• Stantec: Publicly traded global engineering firm with a significant Water practice serving municipal and industrial clients across North America. Competes on wastewater treatment, reuse, and water resources.
• HDR: Employee-owned global engineering firm with a dedicated Water practice serving municipal utilities on treatment, conveyance, and program management. Comparable on many of Hazen's municipal pursuits.
• Woodard & Curran: Private employee-owned engineering and operations firm focused on water, environmental, and infrastructure work for municipalities and industry. Highly comparable niche and client base, though smaller in scale.

Broad incumbents

• AECOM: Publicly traded global infrastructure consulting firm with a large Water and Environment practice. Overlaps with Hazen on municipal water but operates at much broader portfolio scale.
• Tetra Tech: Publicly traded consulting and engineering firm with deep water, environment, and sustainable infrastructure practices. Competes with Hazen on water resources and treatment but covers a much broader portfolio.
• Arcadis: Global design and consultancy with a major Water and Resilience practice built around acquisitions like Greeley and Hansen and IBI. Overlaps with Hazen on municipal water engineering at broader scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• YouTubeyoutube.com/@hazenandsawyer
• LinkedInlinkedin.com/company/hazen-and-sawyer

Revenue estimate

Valuation estimate

Number of profiles

Profiles6 records

Subsidiaries1 record

Funding overview

Funding rounds1 record

Investors1 record

Funding detail is available on the Subscription and Enterprise plan.Contact sales →

M&A

Investments

M&A and investment is available on the Subscription and Enterprise plan.Contact sales →

Frequently asked questions about Hazen and Sawyer