Seres Engineering & Services LLC

Seres Engineering & Services LLC, a minority-owned, SBA-certified 8(a) small disadvantaged business based in Charleston, South Carolina, delivers environmental remediation, hazardous waste management, and facilities maintenance services to federal defense and civilian agencies as a prime contractor (99% of awards) across a geographically dispersed portfolio that spans military installations, Army Corps of Engineers sites, and federal properties nationwide.

Seres operates as a limited liability company and is Asian-Pacific American owned. The company maintains eight named joint venture subsidiaries, all minority-owned and self-certified small disadvantaged businesses, including teaming arrangements with Ayuda, Arcadis, Relyant, and Hana — positioning the firm to pursue larger federal opportunities through structured partnerships while preserving its 8(a) posture. The vendor competes predominantly in full-and-open competition on delivery orders against existing indefinite delivery vehicles; however, Seres has secured multiple 8(a) Sole Source definitive contracts for specialized work, including a $4.5 million supplemental PFAS sampling effort (2022), a $3.53 million Phase I remedial investigation at Westover Air Reserve Base (2022), and an $8.5 million hazardous waste and hazardous material management contract at Fort Stewart (2023).

Seres' capability footprint centers on underground and aboveground storage tank inspections, vapor balance system testing, groundwater monitoring and remediation, PFAS investigation and remediation, environmental site assessments, hazardous waste characterization and management, and infrastructure testing and maintenance. Recent representative work includes a $4.8 million Fort Stewart wetland monitoring and mitigation delivery order (Army Corps of Engineers Savannah, 2023), a $2.28 million environmental and engineering support delivery order for Warner Robins Air Logistics Complex (2024), and a $1.44 million secondary containment and fuel polishing task order at Fort Liberty (Army Corps of Engineers Savannah, 2023). On facilities and construction services, Seres has executed projects such as a $495 thousand Seewee Shell Ring boardwalk design-build for the Forest Service (2021) and a $2.5 million planning analysis and public works support contract at Fort Benning (2021).

Customer concentration is extreme by potential value and reflects a small number of large indefinite delivery vehicles. The Department of the Army Corps of Engineers Baltimore District anchors 86% of combined potential value across all awards through a single $500 million Multiple Award Environmental Services (MAES) MATOC awarded August 2025 for hazardous, toxic, and radioactive waste remediation across the North Atlantic Division. The Army Corps of Engineers Savannah District ranks second with 74 awards valued at $64.3 million combined potential value, driven by task orders for environmental, facilities, and construction work at Fort Stewart, Fort Liberty, and related installations. The Air Force Materiel Command at Warner Robins Air Logistics Complex contributes 16 awards totaling $41.6 million. The Naval Facilities Engineering Command holds 77 awards ($21.1 million combined value) primarily for storage tank and infrastructure inspection services. By award count, these five customers account for 63% of all awards; by dollars, the Baltimore MATOC dominates, with 36 distinct federal customer agencies served across the portfolio.

Seres holds or sits on five named parent indefinite delivery vehicles across the prime footprint. The Naval Facilities Engineering Command issued a $4.5 million single-award 8(a) Sole Source IDV (July 2021–July 2026) for tank inspections and testing, which generated 48 task orders totaling $3.8 million combined potential value under contract N6945014D0009, 39 task orders under N6945019D0109 ($3.9 million), and 37 task orders under N6945021D0046 ($3.9 million). The Army Corps of Engineers Savannah District issued multiple-award task order contracts (W912HN20D1001 and W912HN16D0002) supporting environmental and facilities work, with 14 and 13 task orders respectively. The $500 million MAES MATOC awarded to Seres in August 2025 is the newest and largest indefinite delivery vehicle in the source data. Seres also held a $15 million Competitive 8(a) multiple-award IDIQ with the Forest Service Southern Region for South Carolina construction and facility maintenance (closed July 2025).

Activity has declined materially over the past five years — 27 awards in 2022, declining to 10 in 2024 and 10 in 2025, with only 1 award recorded in 2026 (as of March). This trajectory reflects the completion or wind-down of smaller task-order vehicles; however, the August 2025 award of the $500 million Baltimore MATOC represents a significant recompete win and forward vehicle. Within the next twenty-four months, 13 awards with combined potential value of $23.4 million reach ultimate completion, creating recompete exposure for those task orders and potential follow-on opportunities.

Service Contract Inventory data covering FY2022–FY2024 shows SCI-reportable invoiced revenue of $5.2 million across 12.3 FTEs: $3.5 million in FY2022 (7.5 FTEs), $1.7 million in FY2023 (4.8 FTEs), and $0 in FY2024 (0 FTEs recorded). This reflects only federal service contracts above the $150,000 reporting threshold and excludes goods, products, and non-federal work; SCI figures are a strict subset of the vendor's total federal revenue. On SCI-reportable prime contracts, government-paid hourly rates ranged from a 10th percentile of $98.96/hr to a 90th percentile of $4,879.91/hr, with a median rate of $254.71/hr. Seres performed 0% of its SCI-reported hours through subcontractors, indicating all work was self-performed. GSA Schedule labor rates span 15 categories from $44.13/hr (UXO Technician 1, high school education) through $190.42/hr (Program Manager, bachelor's degree, 15 years experience), with no security-cleared roles offered. This portfolio reflects a junior-to-mid-level technical and supervisory workforce positioned for environmental field and office-based assessment and remediation work.

Seres subcontracts to larger primes in a limited capacity. The source names two subcontract engagements: AECOM Technical Services for multiple-site CERCLA remediation phases at Fort George G. Meade, Maryland (2023) and for AFFF/PFAS remedial investigations at Army National Guard facilities (2022). This 99% prime / 1% sub split indicates Seres operates predominantly as a prime contractor and is not a feeder vendor to larger integrators in its core environmental remediation domain.

The source includes one federal grant: a $117,106 NASA Science grant (CFDA 43.001) under the Research Opportunities in Space and Earth Sciences (ROSES) program, awarded July 2025 with completion targeted for April 2027, to be performed in Cainhoy, South Carolina. This grant falls outside the vendor's typical environmental remediation and facilities maintenance footprint and may reflect a one-off research collaboration or an exploratory initiative rather than a recurring grant revenue stream.

Key Business Areas

Pollution Prevention, P2

Hazardous Waste Management/Disposal

Regulatory Compliance

Energy

Environmental Restoration

Military Munitions Response

Ergonomic

Corrosion Control Prevention

Environmental Engineering

Environmental Compliance

Construction