The Department of the Interior buys differently than most people expect. It manages roughly one-fifth of U.S. land, runs the National Park Service, the Bureau of Land Management, the U.S. Geological Survey, the Bureau of Reclamation, the Bureau of Indian Affairs, and the Fish and Wildlife Service. That spread means Interior buys construction, environmental remediation, IT, scientific equipment, facilities maintenance, wildland fire support, and professional services from thousands of vendors a year.
For a small or diverse business, the headline number is the one that matters: in FY2023, Interior awarded 60% of its eligible prime contract dollars to small businesses. That is well above the government-wide statutory goal of 23%. Interior is not a hard agency to break into if you set up correctly and target the right buying offices.
Here is the actual path.
Step 1: Register in SAM.gov (and get the IDs that gate everything)Every federal vendor starts in the System for Award Management at SAM.gov. Registration is free. Anyone charging you for it is reselling something you can do yourself.
Before you can register, you need a Unique Entity ID (UEI), which SAM.gov issues during the process. You will also pick your NAICS codes (the industry codes that determine which set-asides you qualify for) and confirm your business size against the SBA size standard for each code. Interior contracting officers filter SAM.gov by NAICS and socioeconomic status, so the codes you choose decide which searches you show up in.
If you hold a federal certification, claim it in your SAM profile so it surfaces to buyers. The ones that move the most weight at Interior are 8(a) (socially and economically disadvantaged), HUBZone (historically underutilized business zones), WOSB/EDWOSB (women-owned and economically disadvantaged women-owned), and SDVOSB (service-disabled veteran-owned). If you are still deciding which certifications you qualify for, our certification guides break each program down by eligibility and processing time.
Step 2: Understand the OSDBU and what it does for youInterior's Office of Small and Disadvantaged Business Utilization (OSDBU) advises the Secretary on small-business matters and works with the bureaus to push contracting dollars toward small firms. Its stated mission covers Indian economic enterprises, small disadvantaged businesses, women-owned firms, veteran and service-disabled veteran-owned firms, HUBZone firms, and the AbilityOne program.
The OSDBU is not a contracting office and will not award you work directly. Treat it as your map and your advocate. It runs outreach, explains how the bureaus buy, and points you to the contracting offices that match your capabilities. You can reach the office through its page at doi.gov/pmb/osdbu, and its general inbox is doi_osdbu@ios.doi.gov. Use it early, before you are chasing a specific solicitation, so you understand which bureau spends on your NAICS codes.
Step 3: Use the set-asides Interior actually relies onFederal small-business contracting runs on set-asides: solicitations reserved for a specific category of firm. Interior uses the full standard toolkit.
The core federal set-asides
- 8(a) sole-source and competitive awards for SBA-certified disadvantaged firms.
- HUBZone set-asides and the 10% price evaluation preference in full-and-open competitions.
- WOSB and EDWOSB set-asides in NAICS codes where women-owned firms are underrepresented.
- SDVOSB set-asides for service-disabled veteran-owned firms.
A contracting officer decides whether to set a requirement aside before it ever posts. That is why your SAM profile and certifications matter: they put you in the pool the CO is looking at when making that call.
The Interior-specific path: Buy Indian Act
This is what separates Interior from every other civilian agency. Through the Buy Indian Act, the Bureau of Indian Affairs and the Indian Health Service can set aside procurements for Indian-owned and controlled businesses (Indian Economic Enterprises, or IEEs). The rule supplements the FAR and Interior's own acquisition regulation, the DIAR. If your firm qualifies as an IEE, this is often the least crowded competitive lane in federal contracting. Subcontracting is permitted, but the rule generally requires that at least 50% of the subcontracted work go to other IEEs.
There is also the government-wide Indian Incentive Program under FAR Subpart 26.1, implementing 25 U.S.C. 1544. When a contract authorizes it, a prime contractor can receive an incentive payment equal to 5% of the amount paid to a subcontractor that is an Indian organization or Indian-owned economic enterprise. That gives primes a real reason to bring qualifying firms onto their teams.
Step 4: Find the opportunities before they are awardedTwo places matter.
SAM.gov is the official posting site for federal contract opportunities. Set up saved searches by NAICS code and agency so Interior solicitations land in your inbox the day they post. Reacting to a solicitation cold, with no prior relationship, is the hardest way to win.
Interior's acquisition forecast is the higher-value source. The OSDBU publishes a procurement forecast at doi.gov/pmb/osdbu/forecast listing anticipated contracts above the simplified acquisition threshold, flagged by which small-business categories may be able to perform them as prime or subcontractor. The forecast shows requirements months before they hit SAM.gov, which is exactly when you want to be calling the buying office. If you want to see how Interior's spending compares to other agencies and where the dollars concentrate, our federal spending database tracks award patterns across diverse business categories.
Step 5: Decide between prime and subcontractYou do not have to win a prime contract to start earning revenue from Interior.
As a subcontractor, target the large primes already holding Interior construction, environmental, and IT vehicles. Federal contracts above $750,000 (or $1.5M for construction) carry subcontracting plans with small-business goals the prime has to meet. That obligation is your opening. For IEEs, the Indian Incentive Program adds a direct financial reason for a prime to bring you on.
As a prime, start with smaller requirements under the simplified acquisition threshold where a single contracting officer can move quickly, then build past performance toward larger awards. Past performance is the currency. One clean Interior subcontract makes your next prime bid far more credible.
Before you bid: get your readiness honestMost small firms lose Interior opportunities not on price but on preparation: an incomplete SAM profile, the wrong NAICS codes, or a missing certification that would have qualified them for a set-aside. Before you chase a solicitation, it is worth checking where you actually stand.
Our government readiness tool walks you through the registration, certification, and capability gaps that decide federal bids, and tells you which set-aside lanes you currently qualify for. Run it once, fix what it flags, then go work the Interior forecast. That order wins more contracts than the reverse.
