Top Interior septic tank and related services contractors
In the 12 months ending Oct 5, 2026, the Department of the Interior obligated $8.6M in net prime contract dollars under NAICS 562991, up 3.5% from $8.3M in the preceding 12 months. 148 prime contractors received positive obligations, and 52 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 562991
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 | Mayes Septic & Port a Pots, LLC | $610K | $663K | 6.8% | ▲ 1 |
| 2 | TNT Waste Service LLC | $543K | $218K | 6.1% | ▲ 5 |
| 3 | Mariposa Portable Santitation LLC | $541K | $415K | 6.1% | — |
| 4 | Royal Flush Septic, LLC | $507K | $0 | 5.7% | New |
| 5 | Suntiff, LLC | $271K | $185K | 3.0% | ▲ 3 |
| 6 | Yorkshire Industries LLC | $269K | $0 | 3.0% | New |
| 7 | Provizion LLC | $222K | $104K | 2.5% | ▲ 11 |
| 8 | B & B Portables, LLC | $218K | $218K | 2.5% | ▼ 3 |
| 9 | Tatco RC JV, LLC | $205K | $0 | 2.3% | New |
| 10 | American Debris Box Service, Inc. | $196K | $129K | 2.2% | ▲ 3 |
| 11 | Pro Pumping LLC | $180K | $0 | 2.0% | New |
| 12 | A & G Pumping, Inc. | $176K | $56K | 2.0% | ▲ 26 |
| 13 | Affirm Fitness L.L.C. | $172K | $218K | 1.9% | ▼ 7 |
| 14 | BPM Services Inc | $169K | $156K | 1.9% | ▼ 4 |
| 15 | Brady Bradshaw LLC | $152K | $78K | 1.7% | ▲ 9 |
What changed in the last 12 months
Contractors with the largest change in reported obligations versus the preceding 12 months.
Largest gains
- Royal Flush Septic, LLC$0 → $507K (+$507K) · now #4
- TNT Waste Service LLC$218K → $543K (+$326K) · now #2
- Yorkshire Industries LLC$0 → $269K (+$269K) · now #6
Largest declines
- 310 Dust Control LLC$894K → $0 (−$894K) · no latest-period obligations
- Waste and Water Logistics, LLC$344K → $150K (−$194K) · now #16
- Coast Sanitary, Inc$173K → $0 (−$173K) · no latest-period obligations
New to this market
43 contractors received their first obligations in this market (since FY2022) during the latest 12 months. The largest:
| Contractor | First obligation | Latest 12 mo |
|---|---|---|
| Royal Flush Septic, LLC | Jun 24, 2026 | $507K |
| Yorkshire Industries LLC | Mar 19, 2026 | $269K |
| Tatco RC JV, LLC | Sep 23, 2026 | $205K |
| Talon Septic LLC | May 1, 2026 | $143K |
| Homeland Hub Consulting LLC | Sep 26, 2026 | $87K |
| Steves Septic Service, LLC | Dec 31, 2025 | $72K |
| A&G Septic and Grease LLC | May 11, 2026 | $62K |
| Merrifield Sales & Service, LLC | Jul 7, 2026 | $60K |
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 | $6.0M | $5.0M | Up $1.0M (20.3%) |
| Bureau of Land Management | $1.4M | $2.5M | Down $1.1M (44.9%) |
| Bureau of Reclamation | $646K | $483K | Up $163K (33.8%) |
| U.S. Fish and Wildlife Service | $289K | $197K | Up $91K (46.2%) |
| U.S. Geological Survey | $236K | $0 | New |
| Bureau of Indian Affairs and Bureau of Indian Education | $16K | $14K | Up $2K (17.8%) |
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 |
|---|---|---|---|
| 140P2125P0046 | Mayes Septic & Port a Pots, LLC CHOH ONPS FY25-30 TOILET PUMPING | $1.1M | Jul 23, 2027 |
Common questions
Who are the top Interior contractors for NAICS 562991?
In the latest 12 months, Mayes Septic & Port a Pots, LLC ($610K), TNT Waste Service LLC ($543K), Mariposa Portable Santitation LLC ($541K) received the most Interior obligations for septic tank and related services.
How concentrated is this market?
The eight largest primes held 35.6% of positive obligations, and Mayes Septic & Port a Pots, LLC alone held 6.8%. 43 contractors won their first obligations in this market during the latest 12 months.
Are any large Interior NAICS 562991 contracts ending soon?
1 of the largest awards in this market reach their current end date in the next 18 months. The first is 140P2125P0046 (Mayes Septic & Port a Pots, LLC, $1.1M obligated), ending Jul 23, 2027. An end date is a research lead, not a confirmed recompete: options and extensions often move it.
Related markets
NAICS 562991 across all agencies
DoD · NAICS 562991
$46.5MUSDA · NAICS 562991
$23.7MFigures 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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