RSI

What RSI does

RSI (RSI EnTech, LLC) is a national group of environmental and nuclear services companies headquartered in Oak Ridge, Tennessee, that provides remediation, decontamination and decommissioning (D&D), radiological services, waste management, regulatory compliance, and project delivery to federal agencies and select commercial clients. The company was founded in 1996 as a Woman-Owned Small Business to support the Department of Energy cleanup mission at the former K-25 site and has grown to 501–1,000 employees operating across Tennessee, California, New Mexico, New York, Ohio, Georgia, Kentucky, and Arizona. Since 2016 RSI has been part of ASRC Industrial (AIS), itself wholly owned by Arctic Slope Regional Corporation, which gives RSI companies Small Disadvantaged Business status and 8(a) program advantages in federal contracting. The company has expanded through acquisitions, most recently adding Sigma Science, Inc. in July 2025 to enter the nuclear safety and security services market, and operates through wholly-owned subsidiaries including RSI Services, LLC, RSI EnTech, LLC, and RSI Nuclear, LLC.

The company's underlying technology stack is built around specialized radiological, environmental, and engineering capabilities rather than a software platform. Core technical assets include portable HPGe spectroscopy for in-situ analysis, SAPHIRE and RESRAD probabilistic risk analysis tools, remote-controlled and robotic demolition solutions, non-destructive assay instrumentation, and certified DOT/NRC/IATA shipping systems for radioactive and hazardous materials. Service lines span Asset Management, Environmental, Operations and Maintenance, Project Delivery, Radiological, Regulatory, Renewable Energy (repurposing brownfield sites for photovoltaic solar), and Waste Management. RSI also supports unexploded ordnance removal and complex regulatory workstreams under CERCLA, RCRA, and NEPA. Safety performance is a stated selling point, with 2024 metrics of 0.43 TRIR, 0.00 DART, and 0.56 EMR.

RSI generates revenue through project-based professional services contracts with federal agencies — primarily the Department of Energy, the Department of Defense, the U.S. Navy, the U.S. Army Corps of Engineers, the Air Force Civil Engineer Center, and the Tennessee Valley Authority — using IDIQ vehicles, task orders, and competitive bids. A smaller commercial stream serves nuclear power plants, laboratories, and industrial facilities. Pricing is custom and quote-driven; contract cadences are multi-year. The company markets through its corporate website, LinkedIn, federal contracting platforms, and direct enterprise field sales, and is recognized as a 2025 Best Place to Work in Tennessee. An ongoing federal criminal investigation into a former Envirachem employee's alleged mishandling of radiological materials at the Hunters Point Naval Shipyard is an active risk factor tied to the 2023 Envirachem acquisition.

Name

RSI

Legal name

RSI EnTech, LLC

Website

https://rsienv.com

Company type

Private

Founded year

1996

Operating status

Operating

Headcount range

501–1,000 employees

Short description

RSI (RSI EnTech, LLC) is a national environmental and nuclear services group providing remediation, decontamination and decommissioning, radiological, waste management, and project delivery services to U.S. federal agencies and commercial clients, operating as the environmental services line of ASRC Industrial.

Ownership category

akta.pro rank

Product category

Environmental Remediation Services

SIC

Services-Engineering, Accounting, Research, Management (8700)

akta.pro primary industry

Radiation Protection & Health Physics Services (ALARA programs, shielding design, RSO services) (EUAKAIAJ)

Keywords

• Environmental remediation services
• Nuclear services
• Waste management solutions
• Decontamination decommissioning services
• Radiological services

Headquarters

HQ city

Oak Ridge

HQ country

United States

HQ region

North America

Offices3 records

Markets served

GTM type

B2B

Offering type

Services

Cost components

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

Revenue model

1. Government Contracting - Federal Projects: RSI generates revenue primarily through project-based contracts with federal agencies including the Department of Energy, Department of Defense, and U.S. Navy. Projects range from environmental cleanup to nuclear services to construction management.
2. Private Industry Services: Services provided to commercial clients including nuclear power plants, laboratories, and industrial facilities for environmental, radiological, and waste management services.

Pricing tiers

Go-to-market motion1 record

Distribution channels3 records

Marketing channels4 records

Core offering

RSI is a group of environmental companies providing full-service environmental, nuclear, and project delivery services to federal agencies and private industry. The company delivers environmental remediation, radiological services, decontamination and decommissioning, waste management, regulatory compliance, and construction/project management across nine distinct service lines, supporting clients at all phases of cleanup from strategy to stewardship.

Product overview

RSI (RSI EnTech, LLC) is a group of environmental companies representing the AIS Environmental and Nuclear business line, providing environmental, nuclear, construction management, project delivery, and specialty professional services. The company operates as a portfolio of distinct service lines including Asset Management, Decontamination/Demolition, Environmental, Operations and Maintenance, Project Delivery, Radiological, Regulatory, Renewable Energy, and Waste Management services. RSI serves clients at all phases of cleanup from strategy to stewardship, with recent expansion through the acquisition of Sigma Science, Inc. (July 2025), which added nuclear safety, security, and operations capabilities. The company is an Alaska Native Corporation-owned Small Disadvantaged Business with 8(a) advantages, serving federal agencies and private industry nationwide.

Differentiator

Problem solved

Functional benefit

Products and services

• Asset Management
• Decontamination, Decommissioning, and Demolition Ensures safe disposition of excess and abandoned facilities at active and remote sites. Incorporates specialized equipment and techniques to remove hazardous and radiological substances, decontaminate and demolish structures, and properly dispose of waste materials.
• Environmental Full range of environmental services from early planning to reuse and stewardship. Employs innovative techniques to clean up and return sites to safe and usable states, including air/water quality, remedial investigations, radiological characterization, soil and groundwater remediation, and emergency response.
• Operations and Maintenance Optimizes performance and longevity of environmental systems, infrastructure, and facilities through routine inspections, preventive maintenance, and efficient repairs to minimize downtime and maximize efficiency.
• Project Delivery End-to-end project/program management services from initial assessment and risk analysis to budgeting, scheduling, and stakeholder communication for environmental and construction projects.
• Radiological Specialty expertise in radiological services including characterization, monitoring, materials management, and radiation protection program (RPP) implementation and management at federal cleanup, commercial, nuclear power plant, and laboratory sites.
• Regulatory Comprehensive environmental regulatory strategies and documentation to support complex cleanup projects. Subject matter experts collaborate with owners, regulators, communities, and stakeholders aligning objectives with compliance.
• Renewable Energy Helps clients transition to a cleaner future by repurposing restricted-use brownfield sites for photovoltaic solar power facilities and providing technical assistance in renewable energy policy and project planning.
• Waste Management Tailored solutions for proper handling, transportation, and disposal of radioactive, hazardous, and non-hazardous waste. Services include waste characterization, profiling, manifesting, labeling, packaging, transportation, and certified DOT/NRC and IATA shipping.
• Sigma Science, Inc. Nuclear Services Nuclear safety, security, and operations support services for federal and commercial clients. Provided professional services for nuclear energy, security, and infrastructure modernization programs nationwide, supporting the Department of Energy and the National Nuclear Security Administration.

Quantifiable outcome

• Total Recordable Incident Rate of 0.43 in 2024, significantly below industry average
• +2 more outcomes

Named customers7 records

Segments3 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

Three partnerships are on record, tiered core and minor.

• Sigma Science, Inc.coreStrategic or Co-development Partner · 1 July 2025RSI acquired Sigma Science, Inc., a specialized nuclear services firm based in Albuquerque, New Mexico. Sigma has provided nuclear safety, security, and operations support to federal and commercial clients for nearly 30 years. The acquisition complements RSI's service offerings and expands their capabilities for nuclear energy, security, and infrastructure modernization programs nationwide.
• EnvirachemminorStrategic or Co-development Partner · 1 January 2023RSI EnTech acquired Envirachem in 2023. A former employee of Envirachem is suspected of bringing radiological materials into the Hunters Point Naval Shipyard between 2019 and 2022.
• Arctic Slope Regional Corporation (ASRC)coreStrategic or Co-development Partner · 1 January 2016RSI joined the Arctic Slope Regional Corporation family of companies through acquisition by ASRC Industrial (AIS) in 2016. ASRC is an Alaska Native corporation representing more than 14,000 Iñupiat. This ownership provides RSI with Small Disadvantaged Business status and 8(a) program advantages, enabling the company to support federal diversity contracting goals.

Scale indicators4 records

Recent moves7 records

Expansion highlights5 records

Broad incumbents

• AECOM: AECOM operates a large federal environmental services practice covering remediation, nuclear, and federal infrastructure. Overlaps with RSI on DOE/DOD environmental cleanup but at much broader and larger scale.
• Tetra Tech: Tetra Tech provides consulting and engineering services in water, environment, and sustainable infrastructure for federal and commercial clients. Overlaps with RSI's environmental remediation and federal contracting practice.
• Fluor Corporation: Fluor has a substantial federal services business with nuclear and environmental remediation capabilities serving DOE and DOD. Comparable in nuclear and federal contracting focus but at much larger scale.
• Veolia North America: Veolia operates hazardous waste treatment, environmental remediation, and nuclear services businesses in North America. Comparable in environmental and waste management services but with broader geographic and commercial reach.
• Jacobs Solutions: Jacobs is a major federal environmental and nuclear services contractor, with deep ties to DOE, DOD, and NRC work. RSI competes with Jacobs on federal cleanup and nuclear services bids but at far smaller scale.

Direct peers

• EnergySolutions: EnergySolutions provides nuclear decommissioning, waste management, and environmental services to federal and commercial clients (acquired by BWXT). Directly comparable to RSI across DOE/Navy D&D, radioactive waste handling, and operational scale.
• Perma-Fix Environmental Services: Perma-Fix provides nuclear, federal, and waste management services including radioactive waste processing and environmental remediation. Closely comparable in services mix (radioactive/hazardous waste, federal government), size range, and D&D focus.
• Parsons Corporation: Parsons delivers federal environmental remediation, radiological services, and critical infrastructure to DOE, DOD, and other agencies. Comparable customer base, project delivery model, and federal contracting motion.
• NV5 Global: NV5 provides environmental, geospatial, and infrastructure consulting to federal and commercial clients. Overlapping in environmental remediation and engineering services targeting similar federal customers.
• Clean Harbors: Clean Harbors is a major environmental and industrial services provider offering hazardous waste management, remediation, and decommissioning. Comparable in waste management and environmental cleanup services at larger scale.

Market position

Strengths5 records

Weaknesses5 records

Competitive moat4 records

Key risks5 records

Key highlights7 records

Customer concentration

• LinkedInlinkedin.com/company/rsi-entech-llc
• Facebookfacebook.com/RSIEnTech

Revenue estimate

Valuation estimate

Number of profiles

Profiles10 records

Subsidiaries5 records

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 RSI