DJ&A, P.C.

DJ&A, P.C. specializes in comprehensive engineering and design services for federal infrastructure projects, with deep expertise in architectural and engineering (A/E) design, wastewater system rehabilitation, water distribution upgrades, and road construction post-design support. The firm delivers full lifecycle services including schematic design, design development, construction documentation, condition assessments, and scoping studies—particularly for mission-critical facilities in national parks, wildlife refuges, and transportation corridors. Their technical proficiency spans civil, structural, and environmental engineering disciplines, with a demonstrated focus on restoring aging infrastructure in sensitive ecological and remote locations across the western United States. The contractor maintains a strong, long-standing relationship with the Department of the Interior, where they routinely support National Park Service and U.S. Fish and Wildlife Service projects involving water system rehabilitation, pump station upgrades, and wastewater capacity expansion. They also deliver engineering services to the Department of Agriculture and Department of Transportation, primarily for rural infrastructure improvements and road construction support. Their work consistently involves compliance with federal environmental standards and coordination with resource management agencies to ensure minimal ecological impact. Their primary industry focus is engineering services (NAICS 541330), complemented by specialized capabilities in surveying and mapping (541370) and environmental consulting (541620). This positions them as a niche provider for federal land management agencies requiring integrated technical solutions for infrastructure in protected and geographically challenging areas. They are not certified under any government small business or socioeconomic programs. Based in Missoula, Montana, DJ&A, P.C. operates as a small professional corporation with a regional footprint centered on federal land and transportation assets in the Mountain West. Their operational model emphasizes on-site assessments, adaptive design solutions, and close collaboration with federal resource managers to meet complex regulatory and logistical demands.