Tetra Tech and its subsidiaries work together to meet our clients' needs worldwide. We have the local presence and global resources to support the full project life cycle. Most of our subsidiaries do business as Tetra Tech. Certain organizations that have joined Tetra Tech recently or that offer services under a separate name are listed below.

American Environmental Group, Ltd., A Tetra Tech Company

American Environmental Group (AEG) provides specialty environmental, construction, and maintenance services to solid and hazardous waste, environmental, utility, mining, and other industrial clients. AEG is based in Richfield, Ohio. +1 (330) 659-5930.

Ardaman & Associates, Inc.

Ardaman provides specialty geotechnical and environmental engineering services, including subsurface investigation, geotechnical and foundation engineering, laboratory testing, construction materials testing and inspection, water resources, pre-acquisition site assessments, contamination remediation, phosphogypsum disposal, and earthen dams and facilities engineering. Its headquarters is in Orlando, Florida. +1 (407) 855-3860.

Coffey, A Tetra Tech Company

Coffey provides multidisciplinary consulting and engineering expertise across all phases of the project life cycle for transport and property infrastructure, oil and gas, and mining projects. Coffey’s integrated offering includes geotechnical, environmental, testing, and project management services. Coffey’s international development experience includes agriculture and economic growth; democracy, governance, and rule of law; land tenure and property rights; and security and stabilization; and monitoring and evaluation in more than 80 countries. Coffey is headquartered in Sydney, Australia. +61 2 9406 1000.

Cornerstone Environmental Group, LLC, A Tetra Tech Company

Cornerstone Environmental Group is an engineering consulting and field service firm that provides services to the solid waste industry and other commercial, industrial, and organics management clients throughout North America. They provide the highest quality environmental, solid waste engineering, field service, construction management, and professional services for the full project life cycle. The firm is headquartered in Middletown, New York. +1 (877) 633-5520.

Cosentini Associates, Inc., A Tetra Tech Company

Cosentini is a building systems consulting engineering firm. Cosentini offers integrated services including mechanical/HVAC, electrical, and plumbing (MEP); fire protection, engineering, and code consulting; mission-critical design; information technologies (comprising telecommunications, audiovisual, and security design); lighting design; sustainable design and LEED facilitation; commissioning; and disaster recovery services. Cosentini supports large-scale mixed-use developments, government buildings, command and control facilities, mission-critical facilities, academic institutions, healthcare, and research and development facilities. Cosentini is headquartered in New York, New York. +1 (212) 615-3600.

INDUS, A Tetra Tech Company

INDUS provides information technology solutions focused on data analytics, geospatial analysis, secure infrastructure, and software applications management for U.S. federal government customers. INDUS is based in Vienna, Virginia. +1 (703) 506-6700.

MSI, A Tetra Tech Company

MSI provides international development services focused on program design, implementation, and monitoring and evaluation. MSI experience spans agriculture and economic growth; environment and natural resources; democracy, governance, and rule of law; and security and stabilization projects across Africa, Asia, Europe and Eurasia, Latin America and the Caribbean, the Middle East, and North America. MSI’s clients include national and local governments, large bilateral and multilateral donors, foundations, and universities. Its headquarters is in Arlington, Virginia. +1 (703) 979-7100.

Parkland Pipeline, A Tetra Tech Company

Parkland serves the oil and gas industry in Western Canada. The company specializes in the technical support, engineering support, and construction of pipelines and oilfield facilities. Parkland is based in Olds, Alberta. +1 (403) 507-2774.

PRO-telligent, A Tetra Tech Company

PRO-telligent is a multidisciplinary strategic consulting company providing mission-focused services and solutions to U.S. federal government and international customers. PRO-telligent provides services in policy development, operations, civil security, training, and information technology and information assurance across the United States and internationally, including austere and hostile environments. Its core capabilities include international development and security, peacekeeping capacity building and training, governance and rule of law, justice sector reform, global health operations, and program management. Its headquarters is in Arlington, Virginia. +1 (703) 414-5520.

Tetra Tech ES, Inc.

Tetra Tech ES, Inc. (ENE) is a leading provider of management consulting services in energy, water, and environment for public and private sector clients. Established more than 30 years ago, ENE consists of four units: international development, emerging markets, public-private partnerships (PPPs), and evaluation and market research. ENE’s international development and emerging markets units focus on energy (specifically electricity); utility performance improvement; and energy planning, policy, and regulation. ENE is also a shareholder in Hagler Bailly Pakistan, based in Islamabad, Pakistan. Hagler Bailly Pakistan provides management, economic, regulatory, and technical counseling especially tuned to developing country needs.

Tetra Tech Rooney

For more than 34 years, Tetra Tech Rooney has provided planning, engineering, and construction management services for crude oil and natural gas production, midstream and mainline pipeline and facilities, and transmission projects. Tetra Tech also offers specialized services for refined products pipelines, terminals, and natural gas storage, as well as expertise in helping clients commercially validate their projects. Its headquarters is located in Denver, Colorado. +1 (303) 792-5911.

Western Utility Contractors, Inc.

Western Utility provides installation of fiber optic, telecom, gas/liquids pipeline, and underground water utility construction. Western Utility offers general contractors, local governments, and public utility and energy providers full service, end-to-end installation and repair services. Each of the company’s divisions offers 24/7 emergency response teams that serve many municipalities, public utility companies, and some of the top U.S. providers of telecom and data services. Its headquarters is located in University Park, Illinois. +1 (708) 235-1408.