GSI Environmental Inc.

GSI Environmental Inc., a Houston-based for-profit environmental engineering and consulting firm, serves as a prime contractor (81% of recent awards) and subcontractor on Department of Defense and civilian federal environmental remediation and technology demonstration contracts, competing exclusively under full-and-open (non-set-aside) procurement across research and development and remediation services. The company specializes in per- and polyfluoroalkyl substances (PFAS) remediation, innovative treatment technologies, groundwater contamination assessment, and environmental restoration through programs including the Environmental Security Technology Certification Program (ESTCP) and Strategic Environmental Research and Development Program (SERDP).

GSI Environmental's customer base concentrates heavily on the Department of Defense. The top five customer organizations account for 81% of recent prime awards by count and 97% by combined potential value. The Department of the Army Corps of Engineers National Capitol Region Humphreys Engineer Center Support Activity dominates the footprint with 52 prime awards valued at $36.6 million, anchored by ESTCP and SERDP solicitations. The Department of the Navy Naval Facilities Engineering Command places 26 prime awards valued at $9 million. The Department of the Air Force Materiel Command Installation and Mission Support Center Civil Engineer Center awards 8 prime contracts valued at $6.2 million. A notable outlier in the potential-value ranking is GSA Federal Acquisition Service, which carries a single award of $15 million — likely a multi-year or blanket vehicle — that props its dollar share despite minimal award count.

Recent ESTCP and SERDP prime work exemplifies GSI Environmental's capability portfolio. A $2.05 million cost-plus-fixed-fee definitive contract from Humphreys Engineer Center Support Activity (August 2025) funds demonstration of a Darcy convection-based geothermal heat exchange system for high-efficiency building heating and cooling under ESTCP Project EW25-8539. A $1.568 million ESTCP project (July 2024) addresses thermal steam plasma treatment of volatile PFAS emissions from thermal destructive technologies. A $1.115 million ESTCP effort (April 2025) demonstrates thermal steam plasma treatment of aqueous film-forming foam concentrate to destroy fluorinated surfactants. A $1.422 million contract (August 2023) assesses PFAS mass discharge from vadose, saturated, and matrix diffusion zones to improve conceptual models and Department of Defense remedial investigation and feasibility studies. An Air Force Research Laboratory SBIR Phase 1 award ($139,972, March 2026) funds SAGE, a system for AI-guided environmental review. A $1 million Navy Pacific Fleet Forces contract (March 2026) covers frameworks assessing extreme weather event impacts at environmental restoration sites. Beyond ESTCP and SERDP, a $664,260 Naval Facilities Engineering Command contract (July 2025) addresses Conservation of Natural Resources at Montrose, Colorado.

Activity trajectory shows modest growth and volatility: 15 awards in 2022, declining to 5 in 2023, rebounding to 15 in 2024, then 13 in 2025, with 7 awards through August 2026. Seventeen prime awards carrying $15.9 million in combined potential value reach ultimate completion inside the next twenty-four months, exposing the company to significant recompete activity within its core ESTCP and SERDP portfolio. The combined obligated dollars across all awards ($71 million) exceed combined potential value ($70.1 million), indicating near-full funding draw across the portfolio.

GSI Environmental's subcontractor footprint spans multiple primes. Recent sub work includes remediation services and environmental consulting for AECOM Technical Services on Red Hill Bulk Fuel Storage Facility work at Joint Base Pearl Harbor-Hickam (awards through June 2026), vapor intrusion consulting under Research Triangle Institute primes (June 2025), remediation services on Geosyntec Jacobs A Joint Venture environmental science and engineering contracts (awards through June 2025), and technical support to Clarkson University on an ESTCP project for ex situ treatment of PFAS-impacted soils and sediments (August 2024). A June 2026 sub award references environmental consulting at Red Hill under a NAVFAC Pacific contract. The company also subcontracts to Ch2M Hill for Indian Head site remediation monitoring and to Brown University on an SERDP project using colloidal gas aphrons to remove microplastics and PFAS.

GSI Environmental received one federal grant award: an $180,843 Project Grant from the National Institute of Environmental Health Sciences under the Superfund Hazardous Substances Basic Research and Education program (CFDA 93.143, August 2026) to develop and validate colloidal gas aphrons technology for comprehensive PFAS removal from contaminated water, with performance in Houston through July 2027.

NAICS concentration sits within research and development (42 awards under 541715, 32 awards under related R&D codes) and engineering services (17 awards under 541330). PSC concentration aligns, with 24 awards under R&D Environmental Protection (Basic Research) and 14 awards under General Science and Technology R&D (Basic Research). No parent vehicles (GWACs, agency-wide IDIQs, GSA Schedules) anchor the prime footprint; instead, GSI Environmental competes directly against solicitations issued by Humphreys Engineer Center Support Activity (ESTCP, SERDP BPAs) and Naval Facilities Engineering Command BAAs. Subcontractor work routes through five named Naval Facilities Engineering Command indefinite delivery contracts (N3943022D2400, N6274223D1802, N6274217D1800, N6247021D0007) with 2 to 4 task orders each, and a GSA Multiple Award Schedule with 4 task orders, indicating partnership depth within larger environmental remediation programs.

GSI Environmental Inc. (GSI) is an environmental engineering consulting firm with over 32 years of experience specializing in environmental strategic planning; data management and analysis; and software development and numerical groundwater modeling for water agencies, districts, industry (oil and gas, chemical, manufacturing), government agencies, research and development organizations, utilities, trade organizations, and law firms. From our offices in Texas and California, our more than 90 employees have worked worldwide, providing innovative solutions to soil, groundwater and surface water management and contamination problems and associated regulatory issues. We emphasize careful data collection and analysis and technical ingenuity in all our work to provide solutions that are both efficient and effective.