Top 8 Sewage Cleanup & Biohazard Companies in Montana (2026)

Published: June 10, 20262026538 words2 min read

Key Takeaways

8 sewage & biohazard firms in Montana qualified for this ranking based on verified data from public sources (BBB, Google, IICRC, EPA, Yelp, Angi, HomeAdvisor).
The top firm in this ranking is Buffalo Restoration, Inc., with a MetaScore of 86/100.
Every firm here carries at least one publicly verifiable signal — no firm appears in this article without a cited source.
This list is filtered to firms that explicitly offer sewage & biohazard services. Multi-discipline firms appearing here have that service confirmed on their website or in their public certifications.
Methodology is published in full at restorationindex.com/methodology. Firms can request a correction at restorationindex.com/contact.

Sources cited in this article: Better Business Bureau, Institute of Inspection, Cleaning and Restoration Certification, U.S. Environmental Protection Agency, Google, Yelp, Angi, HomeAdvisor, and Restoration Index.

Based on aggregated public-source data from BBB Business Profiles, Google Business Profile reviews, IICRC certified member directory, EPA Lead-Safe registry, Yelp, Angi Super Service Award lists, and HomeAdvisor recognition, here are the top-ranked sewage & biohazard firms in Montana. Each firm receives a 0-100 Restoration Index MetaScore weighted across 9 sources.

Top 8 Sewage Cleanup & Biohazard Companies in Montana — Ranked by Multi-Source MetaScore

Buffalo Restoration, Inc. (Bozeman, MT) — MetaScore 86/100. BBB A+ accredited. founded 1991. Read the full review.
Five Valleys Restoration & Cleaning LLC (Missoula, MT) — MetaScore 84/100. BBB A+ accredited. Read the full review.
SERVPRO of Helena & Great Falls (Great Falls, MT) — MetaScore 82/100. 4.9-star Google rating across 242 reviews. BBB A+ accredited. Read the full review.
Newman Restoration & Cleaning LLC (Billings, MT) — MetaScore 81/100. 4.9-star Google rating across 206 reviews. BBB A+ accredited. IICRC certified. founded 2016. Read the full review.
ServiceMaster of Billings (Billings, MT) — MetaScore 76/100. 4.6-star Google rating across 72 reviews. BBB A+ accredited. IICRC certified. founded 1981. Read the full review.
Big Sky Cleaning & Restoration (Great Falls, MT) — MetaScore 72/100. BBB A+ accredited. IICRC certified. founded 2015. Read the full review.
SERVPRO of Billings (Billings, MT) — MetaScore 66/100. 5.0-star Google rating across 119 reviews. BBB NR. IICRC certified. founded 2012. Read the full review.
406 Disaster Response (Billings, MT) — MetaScore 63/100. 5.0-star Google rating across 31 reviews. BBB NR. IICRC certified. founded 2018. Read the full review.

Top sewage & biohazard firms in Billings

Newman Restoration & Cleaning LLC leads Billings with a MetaScore of 81/100 and 206 Google reviews. Other top-ranked firms in Billings include ServiceMaster of Billings (MetaScore 76/100), SERVPRO of Billings (MetaScore 66/100), and 406 Disaster Response (MetaScore 63/100).

Top sewage & biohazard firms in Great Falls

SERVPRO of Helena & Great Falls leads Great Falls with a MetaScore of 82/100 and 242 Google reviews. Other top-ranked firms in Great Falls include Big Sky Cleaning & Restoration (MetaScore 72/100).

Frequently Asked Questions

How is the Restoration Index MetaScore calculated?

The MetaScore is a weighted average of nine normalized component scores: Google Business Profile reviews (25%), BBB rating + complaint history (20%), IICRC certification (12%), EPA Lead-Safe registry (8%), years in business (10%), Yelp reviews (10%), Angi Super Service Award (5%), HomeAdvisor Top Rated (5%), and regional industry awards (5%). Firms with sparse data have weights redistributed proportionally across the sources we did find. Full methodology at restorationindex.com/methodology.

Who is the top-ranked sewage cleanup & biohazard company in Montana?

As of June 2026, Buffalo Restoration, Inc. ranks #1 in Montana for sewage cleanup & biohazard with a MetaScore of 86/100. The full ranking and per-firm breakdowns appear below.

How often is this list updated?

Firm-level data (reviews, BBB ratings, certifications) is refreshed every 30 to 90 days depending on the source. Awards and recognition fields refresh annually. The "Last refreshed" date below the article header reflects the most recent data refresh for this article.

Can firms pay to be included or ranked higher?

No. Restoration Index does not accept paid placement. The MetaScore is calculated identically for every firm in the index, whether or not they have any commercial relationship with Pleiades Consultancy (the publisher of this site). The methodology is published in full so firms can audit how the calculation works.

What if a firm I trust is missing from this list?

Coverage is rolling out city by city. If a firm meets our inclusion criteria (operating in the named region, offering sewage cleanup & biohazard services, with at least one verifiable public signal), they will appear in future refreshes. Firms can also reach out via restorationindex.com/contact to request inclusion.

Sources & Further Reading

Every claim in this article is backed by at least one of the following third-party sources. Linked out to the publisher so you can audit the original.