Southall Environmental Associates Inc.

Southall Environmental Associates Inc., based in Aptos, California, delivers marine science and environmental consulting services to federal agencies, primarily the Department of the Navy and the Department of the Interior, as a prime recipient on federal research grants and purchase orders (74% of recent awards) and as a subcontractor on environmental engineering and marine mammal research projects.

The company is structured as a for-profit corporate entity with no SBA set-aside designations. Its capability portfolio centers on marine mammal behavioral and physiological response research, acoustic impact assessment, and environmental engineering support. Representative work includes a $170,658 Naval Facilities Engineering Command purchase order (April 2026) for Level Propagation Modeling Alignment Working Group participation at Naval Construction Battalion Center Port Hueneme, concluding December 2027; a $9,000 Bureau of Ocean Energy Management purchase order (May 2022) for sponsorship contribution to the Estuarine Soundscape Monitoring and Mapping (ESOMM) initiative; and Office of Naval Research project grants for "Process Based Data Fusion for Marine Mammal Science" (awarded August 2024, completing December 2026) and "Focused Next Steps for Behavioral and Physiological Response Studies with Social Delphinids off Southern California" (awarded June 2023, completed April 2025).

Customer concentration is dominated by Navy programs. The top five customer agencies account for 93% of awards, with the Office of Naval Research leading at 11 awards, followed by general Department of the Navy (5 awards), the Bureau of Ocean Energy Management (4 awards, $1 million combined potential value), Naval Education and Training Command (3 awards, $140 thousand combined potential value), and United States Fleet Forces Command Atlantic (2 awards). The vendor sits on Indefinite Delivery Contract N6247020D0016 with two task orders, the identified parent vehicle in the source data. The combined potential value across all 27 awards (prime and sub) is $1.3 million, though obligated dollars total $9 million across the portfolio, reflecting completion of prior-year work. Two awards (combined potential value $171 thousand) reach ultimate completion inside the next twenty-four months.

Southall operates as a subcontractor on marine mammal tagging, field coordination, and data analysis work under Monterey Bay Aquarium Research Institute on four federal research sub-grants (January 2025 through May 2026) and under Duke University on a single sub-grant (July 2023). The company also delivers marine mammal environmental support and engineering services as a named subcontractor to HDR Environmental, Operations And Construction, Inc. on Atlantic Behavioral Response Study contracts (January 2025 and March 2025). Service Contract Inventory data shows minimal SCI-reportable activity, reflecting the vendor's grant-recipient and small-contract posture; FY2024 SCI records indicate 0.5 FTEs in subcontractor capacity. The vendor's work taxonomy clusters around other scientific and technical consulting services (5 awards), research and development in the physical and life sciences (2 awards), and specialized environmental assessment and natural resources R&D, signaling a narrow, science-driven capability set focused on marine mammal and acoustic ecology rather than broad environmental consulting.

SEA, Inc. conducts biological research and consulting services related to measuring and estimating the impacts of noise and other human activities on marine life.