Top Interior water and sewer line and related structures construction contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $752.0M in net prime contract dollars under NAICS 237110, up 68.0% from $447.6M in the preceding 12 months. 129 prime contractors received positive obligations, and 7 of them accounted for 80% of that spend.
Prime contracts funded by the Department of the Interior. Latest 12 months: Oct 6, 2025 to Oct 5, 2026. Source: USAspending.gov.
Obligations by fiscal year
Net prime contract obligations by federal fiscal year (October to September).
Top Interior contractors for NAICS 237110
Ranked by positive obligations in the latest 12 months. Share is of all positive obligations in this market.
| # | Contractor | Latest 12 mo | Prior 12 mo | Share | Rank change |
|---|---|---|---|---|---|
| 1 | Record Steel and Construction, Inc. | $129.8M | $45.5M | 17.0% | ▲ 2 |
| 2 | Ames Federal Contracting Group LLC | $129.5M | $0 | 16.9% | New |
| 3 | G.S.E. Construction Company, Inc. | $109.5M | $0 | 14.3% | New |
| 4 | Flatland Energy Services LLC | $75.5M | $0 | 9.9% | New |
| 5 | Carstensen Contracting Inc | $72.9M | $0 | 9.5% | New |
| 6 | Perini Management Services, Inc. | $70.5M | $41.9M | 9.2% | ▼ 2 |
| 7 | Pate Construction Co., Inc. | $37.0M | $3.8M | 4.8% | ▲ 8 |
| 8 | Bairco Construction Inc | $19.2M | $34K | 2.5% | ▲ 88 |
| 9 | cbse2 JV | $18.0M | $0 | 2.4% | New |
| 10 | Stronghold Engineering Inc | $11.2M | $5.9M | 1.5% | ▲ 1 |
| 11 | Orcom, a Division of Ortega Companies, Inc | $10.4M | $666K | 1.4% | ▲ 18 |
| 12 | Sealaska Constructors LLC | $9.8M | $0 | 1.3% | New |
| 13 | Guardian Construction, Inc. | $9.8M | $38K | 1.3% | ▲ 79 |
| 14 | Mckenzie Construction & Site Development LLC | $8.8M | $3.4M | 1.1% | ▲ 3 |
| 15 | Jacobs Project Management Co. | $8.5M | $132.6M | 1.1% | ▼ 14 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Ames Federal Contracting Group LLC$0 → $129.5M (+$129.5M) · now #2
- G.S.E. Construction Company, Inc.$0 → $109.5M (+$109.5M) · now #3
- Record Steel and Construction, Inc.$45.5M → $129.8M (+$84.3M) · now #1
Largest declines
- Jacobs Project Management Co.$132.6M → $8.5M (−$124.1M) · now #15
- CDM Constructors Inc$88.3M → $6.5M (−$81.8M) · now #17
- R.C.S. Construction, Inc.$26.6M → $502K (−$26.1M) · now #27
New to this market
59 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Ames Federal Contracting Group LLC | Nov 10, 2025 | $129.5M |
| G.S.E. Construction Company, Inc. | May 28, 2026 | $109.5M |
| Flatland Energy Services LLC | Jun 9, 2026 | $75.5M |
| Carstensen Contracting Inc | Sep 4, 2026 | $72.9M |
| cbse2 JV | Sep 3, 2026 | $18.0M |
| Sealaska Constructors LLC | Aug 21, 2026 | $9.8M |
| Tehama Technical Services, LLC | May 27, 2026 | $6.6M |
| JR Merit, Inc. | Sep 22, 2026 | $4.1M |
Where the money comes from
Funding sub-agencies within the Department of the Interior, latest 12 months. The funding organization can differ from the office that runs the requirement.
| Funding sub-agency | Latest 12 mo | Prior 12 mo | Change |
|---|---|---|---|
| National Park Service | $406.1M | $150.2M | Up $255.9M (170.4%) |
| Bureau of Reclamation | $341.7M | $285.6M | Up $56.2M (19.7%) |
| U.S. Fish and Wildlife Service | $2.3M | $4.4M | Down $2.1M (47.4%) |
| Bureau of Land Management | $1.0M | $3.0M | Down $2.0M (65.5%) |
| Bureau of Indian Affairs and Bureau of Indian Education | $541K | $4.2M | Down $3.7M (87.1%) |
| U.S. Geological Survey | $324K | $121K | Up $202K (167.0%) |
Potential recompetes
Large awards in this market whose current period of performance ends in the next 18 months. Treat these as research leads: options, extensions, and follow-on vehicles often change the timing.
| Award | Incumbent | Obligated | Current end |
|---|---|---|---|
| 140P2024C0008 | Southern Contracting, LLC CATO 250011 REHABILITATE PARKWIDE UTILITIES | $21.8M | Jan 15, 2027 |
| 140R1020C0012 | Hartman-Walsh Painting Company JOHN W. KEYS III PUMP-GENERATING PLANT DISCHARGE TUBE COATING-LINING REHABILITATION | $34.6M | Feb 16, 2027 |
| INR17PC00023 | CDM Constructors Inc POJOAQUE BASIN REGIONAL WATER SYSTEM | $271.2M | Feb 28, 2027 |
| 140R4025C0002 | MGC Contractors Inc BGNDRF TREATMENT BUILDING EXPANSION DESIGN BUILD | $15.8M | Mar 21, 2027 |
| 140P2025C0007 | R.C.S. Construction, Inc. MORU 272051, REHABILITATE AND EXPAND WASTEWATER TREATMENT PLANT, MOUNT RUSHMORE NATIONAL MEMORIAL, KEYSTONE, SOUTH DAKOTA | $27.1M | Jun 5, 2027 |
| 140P2025C0058 | Perini Management Services, Inc. GLCA 318744 DESIGN BUILD - REPLACE CRITICAL WASTEWATER UTILITIES | $42.8M | Aug 30, 2027 |
| 140P2026C0013 | Bairco Construction Inc GLAC 318705 - PACKAGE #1 CONSTRUCTION SO | $18.6M | Aug 31, 2027 |
| 140P2026C0047 | cbse2 JV GRCA 318719 CONSTRUCT TEMP. WWTP AT NORT | $18.0M | Nov 19, 2027 |
| 140P2023C0001 | Stronghold Engineering Inc GRCA 190083 / 250176 - IMPROVE POTABLE WATER SUPPLY TO INNER-CANYON AND SOUTH RIM, TRANS-CANYON WATER DISTRIBUTION PIPELINE, GRAND CANYON NATIONAL PARK, AZ | $226.4M | Jan 8, 2028 |
| 140P2026C0016 | Record Steel and Construction, Inc. YELL 326133 REHABILITATE CANYON VILLAGE WASTEWATER TREATMENT SYSTEMS | $129.2M | Feb 14, 2028 |
Common questions
Who are the top Interior contractors for NAICS 237110?
In the latest 12 months, Record Steel and Construction, Inc. ($129.8M), Ames Federal Contracting Group LLC ($129.5M), G.S.E. Construction Company, Inc. ($109.5M) received the most Interior obligations for water and sewer line and related structures construction.
How concentrated is this market?
The eight largest primes held 84.2% of positive obligations, and Record Steel and Construction, Inc. alone held 17.0%. 59 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior NAICS 237110 contracts ending soon?
10 of the largest awards in this market reach their current end date in the next 18 months. The first is 140P2024C0008 (Southern Contracting, LLC, $21.8M obligated), ending Jan 15, 2027. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
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$6.6MFigures are net obligations on prime contracts (award types A–D) from USAspending.gov, grouped by funding agency and the NAICS code on each award. Net obligations include deobligations and corrections, so they can differ from positive-obligation totals. See methodology.
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