What Montgomery & Associates does

Montgomery & Associates (legal entity: Errol L. Montgomery & Associates, Inc.) is a private hydrogeology and water resource consulting firm founded in 1984 and headquartered in Tucson, Arizona. The firm provides professional services across seven practice areas: Water Supply & Recharge, Mining Hydrogeology, Water Resource Planning, Environmental Hydrogeology, Groundwater Modeling, Surface Water, and Data Management Services. Its proprietary M&A Data Management System (DMS) is a customizable web-based platform with GIS mapping, document libraries, data export, and integrations with Esri Collector and Survey123 for field data collection and telemetry. Specialized offerings include 3D geological modeling using Leapfrog software, groundwater flow and transport modeling with GoldSim, CFC-based aquifer characterization, and lithium brine resource and reserve estimation under NI 43-101 and JORC reporting standards.

M&A generates revenue through project-based consulting engagements billed on scope, complexity, and duration, with multi-year contracts disclosed in pricing models. Its go-to-market is enterprise field sales: direct engagement with clients through industry conferences, professional development workshops, technical publications (Hydro Notes), and association involvement. The firm serves mining, municipal water, agricultural, industrial, tribal, and legal-sector clients across the U.S. Southwest, California, and South America (Chile, Argentina, Bolivia, Brazil, Colombia, Mexico), with named enterprise customers including SQM, POSCO, Lithium Chile, Wealth Minerals, Blackrock Silver, Central Arizona Project, Antelope Valley-East Kern Water Agency, Tulare Irrigation District, and Soquel Creek Water District. Notable credentials include Qualified Person certifications under NI 43-101 and Competent Person under JORC, the 2024 Herman Bouwer Award (Mark Cross), and responsibility for approximately 58% of total USF water storage in Arizona.

The firm operates from six offices (Tucson, Sacramento, San Luis Obispo, Oakland, Santiago, Salta) and acquired HydroMetrics WRI in 2018 to strengthen California groundwater sustainability agency (SGMA) capabilities. With 101-250 employees, M&A combines deep human expertise in hydrogeology with proprietary data tooling and incremental AI/ML adoption for optimizing water sustainability project outcomes.

Name

Montgomery & Associates

Legal name

Errol L. Montgomery & Associates, Inc.

Website

https://elmontgomery.com

Company type

Private

Founded year

1984

Operating status

Operating

Headcount range

101–250 employees

Short description

Montgomery & Associates is a private hydrogeology and water resource consulting firm, founded in 1984 and headquartered in Tucson, Arizona, serving mining, municipal, agricultural, industrial, tribal, and legal clients across the U.S. and South America through project-based consulting and a proprietary data management system.

Ownership category

akta.pro rank

Product category

Hydrogeology and Water Resource Consulting Services

NAICS

Other Scientific and Technical Consulting Services (54169), Environmental Consulting Services (54162), Support Activities for Mining (213)

SIC

Services-Management Consulting Services (8742), Services-Commercial Physical & Biological Research (8731)

akta.pro primary industry

Water, Wastewater & Hydraulics Engineering Consulting (BPAHAIAD)

akta.pro secondary industries

Water, Wastewater & Stormwater Compliance (BPAHAJAJ), Mine Hydrogeology & Pit Dewatering (Seepage, Water Balance) (EUAHAFAI), Mine Dewatering & Water Management Services (Pumping, Treatment, Tailings Water Return) (IMAKAKAI)

Keywords

• Hydrogeology consulting
• Groundwater modeling services
• Managed aquifer recharge
• Mining hydrogeology services
• Water resource management

Headquarters

HQ city

Tucson

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, Others

Revenue model

1. Professional Consulting Services: Montgomery & Associates generates revenue through providing professional hydrogeology and water resource consulting services to mining, municipal, agricultural, industrial, tribal, and other clients. Services are billed on a project basis based on scope, complexity, and expertise required.

Pricing tiers

Go-to-market motion1 record

Distribution channels1 record

Marketing channels5 records

Core offering

Montgomery & Associates is a professional hydrogeology and water resource consulting firm delivering services for mining, municipal, agricultural, industrial, tribal, and government clients. Core offerings include groundwater flow and transport modeling, managed aquifer recharge planning and permitting, mining hydrogeology, water resource planning, environmental hydrogeology, surface water studies, and a proprietary Data Management System for groundwater sustainability monitoring and reporting.

Product overview

Montgomery & Associates is a hydrogeology and water resource consulting firm providing professional services since 1984 for mining, municipal, agricultural, industrial, tribal, and other clients. The company's portfolio centers on its core Data Management System (DMS) platform, which powers groundwater sustainability through web-based data management, monitoring, and reporting capabilities. Supporting services include Water Supply & Recharge, Mining Hydrogeology, Water Resource Planning, Environmental Hydrogeology, Groundwater Modeling, Surface Water, and Data Management Services. The Managed Aquifer Recharge (MAR) practice represents a key strategic service for aquifer replenishment. Specialized offerings include 3D modeling services using Leapfrog software and Lithium Brine Resource Evaluation with NI 43-101 and JORC-compliant technical reporting capabilities.

Differentiator

Problem solved

Functional benefit

Products and services

• Water Supply & Recharge Services Professional consulting services for water supply development and recharge investigations, including site characterization, feasibility assessments, and permitting for recharge facilities, for municipal, agricultural, and industrial clients.
• Mining Hydrogeology Services Hydrogeological services for mining clients including characterization of fractured bedrock and basin-fill aquifer systems, support for mining EIS and permitting studies, and feasibility investigations in the United States and South America.
• Water Resource Planning Services Comprehensive water resource planning services including developing water supply inventories, valuing and ranking water assets, and preparing water acquisition strategies and plans for agencies and large water users.
• Environmental Hydrogeology Services Environmental consulting services including environmental baseline studies, environmental due diligence, and environmental impact assessments for industrial, mining, and government clients.
• Groundwater Modeling Services Numerical and analytical groundwater flow and transport modeling services using tools such as GoldSim software to simulate effects of mine dewatering, managed aquifer recharge and recovery, and long-term pumping scenarios.
• Surface Water Services Services related to surface water management including surface water monitoring, stream and riparian area studies, and analysis of groundwater-surface water interactions.
• M&A Data Management System (DMS) A customizable web-based data management platform that stores and manages groundwater monitoring data, facilitates GSP reporting to California DWR, and includes web maps, document libraries, and data export tools, with integration to Esri Collector and Survey123 for field data collection and to telemetry data sources.
• Managed Aquifer Recharge (MAR) Services Managed Aquifer Recharge is a strategic service for replenishing aquifers and managing water supplies, integrating imported sources such as Colorado River water and treated effluent into water resource portfolios, with documented involvement in 6 of 7 CAP Underground Storage Facility recharge projects in Arizona.
• Lithium Brine Resource Evaluation Specialized services for lithium brine resource and reserve estimation, including hydrogeological modeling, resource quantification, and NI 43-101 and JORC-compliant technical reporting for South American salar projects.
• 3D Modeling Services Specialized 3D modeling services using Leapfrog software to develop volumetric geologic and geochemical interpolation models for conceptual hydrogeologic representations supporting mining and recharge projects.
• Data Management Services Database development, geospatial analysis, and online mapping application development services, including integration with field data collection tools and telemetry data, supporting groundwater monitoring and reporting.

Quantifiable outcome

• More than 5 million acre-feet of water stored at recharge projects in Arizona (more than half of total USF storage)
• +2 more outcomes

Named customers17 records

Segments6 records

Ideal customer profiles3 records

Technology focussed No

API detail

Has API

No

API docs

API detail

Core technology

AI maturity

App detail

Integration2 records

AI capability2 records

Feature6 records

Partnerships

One partnership is on record.

• Engineering Design Firms (General)coreImplementation/ SI/ Consulting PartnerMontgomery & Associates collaborates with engineering design firms for MAR and recharge projects. Specifically, in 2019 collaborated with an engineering design firm to design a regional groundwater bank at scale. These partnerships allow M&A to provide comprehensive hydrogeological services combined with engineering design capabilities for large-scale projects.

Scale indicators6 records

Recent moves7 records

Expansion highlights5 records

Direct peers

• Haley & Aldrich: U.S. environmental and geotechnical consultancy with strong hydrogeology, groundwater modeling, and water supply practices serving industrial, municipal, and mining clients — closely aligned with M&A's service mix and customer profile.
• Brown and Caldwell: Water and environmental engineering consultancy with strong municipal water and groundwater sustainability practices that competes with M&A on SGMA, water supply, and recharge work in California and the Southwest.
• Geosyntec Consultants: Specialty environmental and water resources engineering firm with strong credentials in groundwater modeling, remediation, and water supply — a comparable mid-to-large specialty competitor with academic depth similar to M&A's.
• Daniel B. Stephens & Associates: Specialty water resources and hydrogeology firm focused on the western U.S., with similar service lines to M&A in groundwater modeling, recharge, and mining support — a direct niche competitor especially in the Southwest.
• SLR Consulting: Global environmental and advisory firm with a sizable water resources and mining practice that competes with M&A for hydrogeology, groundwater modeling, and ESG-related water work across the Americas and internationally.
• Golder Associates (now part of WSP): Historically a leading global hydrogeology and mining services consultancy with deep overlap in mine dewatering, resource estimation, and water resource management; now operating within WSP but still the closest functional competitor to M&A on mining hydrogeology and lithium brine work.

Broad incumbents

• Tetra Tech: Large global engineering and consulting firm with leading water resources and mining practices; competes with M&A as a prime on larger integrated water and mining projects but is not a specialized hydrogeology boutique.
• Stantec: Major North American engineering and environmental firm with a sizable water practice covering municipal supply, groundwater, and mining support — overlapping with M&A on broader water resource planning mandates.
• Arcadis: Global design and consultancy with major water and environmental practices (including the legacy Golder/Callaghan mining heritage); competes with M&A on multi-disciplinary water and mining engagements at the upper end of project scale.
• ERM (Environmental Resources Management): Global sustainability and environmental consulting firm with a mining and water practice that increasingly overlaps with M&A's hydrogeology and resource estimation services, particularly for large mining and lithium clients.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat5 records

Key risks6 records

Key highlights7 records

Customer concentration

• Xx.com/elmontgomeryh2o

Revenue estimate

Valuation estimate

Number of profiles

Profiles8 records

Subsidiaries1 record

Funding overview

Funding rounds

Investors

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 Montgomery & Associates