S.s. Papadopulos & Associates, Inc.

S.s. Papadopulos & Associates, Inc., headquartered in Rockville, Maryland, is a for-profit environmental consulting firm that operates as a prime contractor (97% of recent awards) delivering groundwater evaluation, site characterization, groundwater modeling, geographic information systems analysis, and expert witness litigation support to federal environmental agencies. The firm competes on full-and-open federal contracts without SBA set-aside designations, anchored to the GSA Multiple Award Schedule and single-award blanket purchase agreements with EPA regions.

The vendor's customer concentration splits decisively across two rankings. By award count, the Department of Justice Civil Division leads with 20 awards ($3 million combined potential value), followed closely by EPA Region 5 with 19 awards ($25.4 million), and DOJ's Environment and Natural Resources Division with 14 awards ($2 million)—together representing 68% of recent awards. By dollar value, however, the portfolio is heavily skewed: the Department of Energy National Nuclear Security Administration anchors the top position with a single award carrying $91 million combined potential value (62% of the firm's total pipeline), followed by EPA Region 5 ($25.4 million), GSA Public Buildings Service Region 8 ($11 million), and GSA Federal Acquisition Service ($10 million). This concentration pattern reveals a vendor whose volume customer base (DOJ, EPA) sustains steady task-order flow but whose recompete risk sits concentrated in a single NNSA vehicle—the combined potential value of awards completing within the next twenty-four months stands at $11.3 million across 18 awards, representing 8% of total pipeline.

Papadopulos operates two principal parent vehicles. The GSA Multiple Award Schedule carries a $6 million ceiling, awarded December 2021 through December 2026, with 52 task orders generating $136.1 million in combined potential value—this is the primary delivery mechanism across EPA regions, the U.S. Geological Survey, the U.S. Department of Agriculture Forest Service, and DOJ. The firm also holds a $10 million Blanket Purchase Agreement with EPA Region 5, awarded September 2024 through September 2027, for groundwater evaluation and optimization support (GEOS4) serving Superfund remedial project managers. Representative work includes a $789,621 BPA call for ACME Solvent Reclaiming Superfund site support (EPA Region 5, August 2025), a $540,980 call order for Pristine Inc. Superfund site remediation (EPA Region 5, December 2025), and a $339,634 expert witness purchase order from DOJ's Environment and Natural Resources Division (February 2026). The vendor also delivered a $2.22 million expert witness services purchase order to DOJ's Civil Division (July 2022) and a $497,499 delivery order from the U.S. Geological Survey for MT3D-USGS groundwater modeling software modernization (September 2023).

Activity has remained relatively flat over the past five years, with four to nine awards annually and 2025 representing the highest recent count at nine awards. The category footprint is dominated by expert witness services (51 awards, All Other Legal Services NAICS) and environmental consulting work (42 awards, Environmental Consulting Services NAICS), reflecting the firm's dual positioning as both technical remediation support and federal litigation counsel on environmental matters. Award types are predominantly BPA calls, GSA Schedule delivery orders, and DOJ purchase orders, all priced on time-and-materials or firm-fixed-price bases without set-asides.

The vendor's service-contract footprint, as captured in the Service Contract Inventory for FY2022–FY2024, shows SCI-reportable invoicing of $9.9 million across 26 prime records with no subcontractor records reported. FY2023 represented the peak year at $4 million invoiced across 9.3 FTEs, declining to $3.6 million across 8.0 FTEs in FY2024. On federal services contracts captured in SCI, government-paid median rates ran around $191 per hour, with senior labor pricing through $287.66 per hour for Principal-level roles; the firm's GSA Schedule labor portfolio spans ten categories from Administrative Support ($85.50/hr, high school education) through Principal ($287.66/hr, master's degree and 20+ years experience), with no security-cleared roles offered. Across SCI-reportable prime contracts, subcontractors accounted for 15% of total hours on average, with 29 named subs engaged across the records—a pattern indicating the vendor builds most delivery teams internally while leveraging specialized subs for depth.

As a prime contractor, Papadopulos holds limited subcontract exposure. The source names two sub-awards: a groundwater operations task under the Hanford Central Plateau Cleanup Contract with Central Plateau Cleanup Company, LLC (January 2024), and a building-infrastructure modification sub under J.E. Dunn Construction Company (June 2022). This subcontract footprint is minimal—97% of the vendor's recent award base sits as prime work—and both subs appear to be one-off engagements rather than recurrent teaming partners.

The firm operates under a parent-entity structure with two named subsidiaries: S.s. Papadopulos & Associates, Inc. and SS Papadopulos & Associates Inc., both for-profit business entities. The source does not state differentiated capability or operational roles for these subsidiaries; they appear to be alternative registrations or legal entities under the same enterprise.