Vetted & Verified · Updated August 2026
Best Septic Companies in Flagstaff, AZ
As of August 2026, we found seven septic contractors holding an active Arizona Registrar of Contractors CR-41 ("Septic Tanks and Systems") license with a Flagstaff or Parks, Coconino County mailing address — verified directly against the ROC's own public Contractor Search, not self-reported. This list is unranked and not sponsored; see the disclosure below.
Disclosure: Flagstaff Septic Pros is an independent referral service. We do not receive payment from any company listed here for inclusion or placement, and this list is not an endorsement of quality or workmanship — it's a license-verification list. If you request a quote through this site, we may match you with one of these companies or another licensed provider in our network, and we may be compensated by whichever provider you hire if you choose to use our matching service. Always verify a company's current license status yourself before hiring.
How This List Was Built
We ran a direct search of the Arizona Registrar of Contractors' public Contractor Search tool, filtered to the CR-41 "Septic Tanks and Systems" classification and a Flagstaff or Parks (Coconino County) mailing address, and confirmed each result shows an Active license status as of August 2026. We did not use directory listings, star ratings, or review counts to build or order this list — none of that data is verifiable, and Flagstaff Septic Pros never fabricates ratings or review counts (that's a hard rule for this site, not a courtesy). The order below is alphabetical-adjacent to how we found them, not a ranking.
An important note on what this list leaves out: septic pumping is licensed by a completely different Arizona agency — ADEQ's septage hauler program — not the ROC. A real, legitimately licensed pumping-only company will never appear in an ROC search, under any name variant, because pumping-only operators aren't required to hold a CR-41 license at all. That's genuinely useful to know when you're vetting a company: if a pumping-only business doesn't show up in an ROC search, that's normal, not a red flag — ask them directly for their ADEQ hauler permit number instead.
For more on what each license actually covers, and what a project on your specific lot is likely to cost either way, see our installation hub and full cost guide.
The List (Unranked)
AZ Alternative Septic Solutions
CR-41, ROC 331579
The market's most established engineered/alternative-system specialist by domain age and content depth — a genuinely strong pick if your lot needs an engineered system.
Covenant Group Contracting
CR-41, ROC 231550
Flagstaff-mailing-address, CR-41-licensed general septic contractor.
Crazy Russian Construction Co
CR-41, ROC 200988
Sole-proprietor CR-41 license (Sergei Kolenechenko), Flagstaff-based.
Flash Excavating
CR-41, ROC 228761
CR-41-licensed excavation and septic contractor, Flagstaff.
Grand Canyon Excavation
CR-41, ROC 334261
CR-41-licensed excavation and septic contractor, Flagstaff.
928 Construction
CR-41, ROC 361941
CR-41-licensed general contractor offering septic system work, Flagstaff.
Northern Arizona Septic Specialists
CR-41 + R-2 Excavating, ROC 351907 / 334586 (Larsen Contracting LLC, DBA)
Headquartered in Parks — inside the septic-served service area itself, not commuting in from Flagstaff proper. Worth asking about specifically if you're in Parks or Baderville.
License numbers shown above are as confirmed via ROC Contractor Search in August 2026 — licenses can lapse or be renewed; verify current status yourself before hiring at azroc.my.site.com.
Frequently Asked Questions
Is this list ranked or sponsored?
No — this list is unranked and presented in no particular order. None of these companies paid for placement, and none is a client of Flagstaff Septic Pros; they're listed because each holds a verified Arizona ROC CR-41 license with a Flagstaff or Parks mailing address as of August 2026.
Why don't I see any pumping-only companies on this list?
This list focuses on ROC CR-41-licensed installation and repair contractors, which we can verify directly against the state's public Contractor Search. Pumping-only businesses are licensed under a separate ADEQ septage hauler program instead of the ROC, so they genuinely won't show up in an ROC contractor search — that's normal, not a red flag. If you need pumping-only service, ask the company directly for their current ADEQ septage hauler permit number and confirm it against ADEQ's licensed-hauler roster before hiring.
How do I verify a septic company's license myself?
For installation or repair, search the company name directly at azroc.my.site.com (the Arizona Registrar of Contractors' Contractor Search) and confirm an active CR-41 license. For pumping-only companies, ask them directly for their ADEQ septage hauler permit number, since ADEQ doesn't offer as convenient a public search tool as the ROC does.
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