Alberta's Largest Environmental Consulting Firms (2026, by the Numbers)

By Phaseview | Published August 6, 2026

If you are hiring an environmental consultant in Alberta, or sizing up the competition, the first question is usually the simplest: who are the biggest firms, and who is actually growing? It is a surprisingly hard question to answer from the outside. Company websites all claim momentum, and there is no public league table of environmental consultants in the province.

There is, however, a public paper trail. Almost every environmental report filed with the Alberta Energy Regulator carries the name of the firm that produced it. Count those filings, firm by firm and year by year, and a real ranking falls out - who is busiest, who is climbing, and, just as importantly, who only looks like they are climbing because of a rename or an acquisition.

We built the Consultant Deep Dives page to make that trail searchable. Here is what it currently shows for Alberta, and how to read it without being fooled.

The largest environmental consulting firms in Alberta

Ranked by environmental reports filed with the AER in 2025, these are the busiest firms in the province. Share is that firm's slice of all environmental reports filed in Alberta that year.

Two things stand out. First, the field is not dominated by the household-name global consultancies. WSP, the one true multinational in the top ten, sits eighth; the top of the board belongs to Alberta-focused specialists like TerraLogix, Ram River, and GCL that have quietly built large reclamation and closure books. Second, no single firm owns the market: even the largest holds well under a tenth of it. This is a fragmented, competitive field, which is exactly why a defensible ranking is useful.

One caveat before you read too much into the order: a report is a report in this count, whether it is a two-page reclamation certificate or a 200-page Phase II assessment. This measures filing activity, not revenue, headcount, or the complexity of the work. Read it as "who is busiest, on the most sites", not "who is best".

Find the right firm for your site

The list above is the whole province. What most people actually want is narrower: who has a real track record for my kind of work, near my site. That is a different ranking - by local experience, not raw volume - and you can run it right here:

The fastest-growing firms, and what real growth looks like

Size is a snapshot. Growth is the trajectory, and it is where the interesting stories are - if you read it carefully.

Genuine, earned growth has a recognizable shape: more work, on more sites, year after year, off a base that keeps getting larger. It is a curve, not a cliff.

• SWAT Consulting is the cleanest example on the board. It has climbed for six straight years, from roughly 50 reports in 2020 to over 850 in 2025, growing into the top ten under its own steam. Adding half again to your volume when you are already one of the busiest firms in the province is far harder than a small-base leap.
• 360 Engineering & Environmental is the standout for growth at scale: already the second-largest filer, and still expanding off an enormous base after years of steady increases. Most firms plateau at that size.
• Arletta Environmental Consulting climbed from the mid-20s in 2020 to roughly 250 reports in 2025, a real multi-year expansion.
• West Earth Sciences is the youngest of the group, going from its first handful of reports in 2022 to well over 100 by 2025 - fast, but a smooth ramp with no sudden spike.

These are the firms whose momentum looks like it is genuinely theirs, earned across seasons rather than acquired overnight.

When a "top mover" is really a rebrand or an acquisition

Here is the trap that catches every naive leaderboard, and the reason we do not just publish a ranked list of biggest percentage gainers.

When a firm is renamed, merged, or acquired, its filed work re-attributes to the new name. Overnight, a name that barely existed can appear to file hundreds of reports, and a raw growth percentage will crown it the fastest-growing firm in Alberta. It is not. It is the same work under a new banner.

The filing pattern gives it away: a flat line for years, then a single vertical step.

• Ambipar Response Canada filed a literal handful of reports a year through 2023, then jumped to over 900 by 2025 as the Brazilian emergency-response multinational rolled up Canadian operations under its name. That is a corporate event, not organic Alberta growth - which is exactly why it lands fifth on the size table despite barely existing here two years ago.
• Montrose Environmental Solutions Canada shows the same signature more gradually: about a dozen reports in 2022, then roughly 180 in 2024 and over 700 in 2025 as an acquirer's book of work consolidated under one name.
• Evotek Consulting hovered in the 40s for years, then jumped to roughly 260 in a single year.
• Terra-Sano illustrates the pure rename: one Terra-Sano entity's filings wind down over the same years a successor entity's climb begins - two halves of a single firm.

None of this is a knock on those firms; acquisitions and renames are normal. The point is that they are not the same thing as winning more work, and a ranking that cannot tell the difference is worse than no ranking at all. Our consultant lineage view is where this gets resolved over time: as we link predecessor and successor firms, an acquired book of work shows up as continuity, not as an overnight breakout. Until then, a single-year explosion off a near-zero base should read as "look closer", not "champion".

Why report counts aren't the whole story

Two more honest caveats, because they change what the numbers mean.

Report types are not interchangeable. A firm that lands a large reclamation-certificate program posts big volume growth without necessarily taking on more complex assessment work. So a raw ranking blends a reclamation specialist and a contamination-assessment shop as if they were competing for the same job. They usually are not. The deep-dive page lets you filter by classification and re-rank on Phase II work alone, or reclamation alone - so if you care about who leads in complex site assessment specifically, you can ask that exact question rather than reading a blended total.

Recent years are still settling. Reports keep arriving and getting attributed for months after their effective date, so the most recent year or two is a lower bound that drifts upward. Treat the counts here as a mid-2026 snapshot, not a final tally - which is another reason we lean on multi-year shape rather than any single headline number.

See the full picture

Every figure here comes straight off the Consultant Deep Dives page, and it recomputes as the data lands. Pick a window, set a classification, and watch the rankings re-sort. Search any firm by name for its full profile - year-by-year history included - so you can judge for yourself whether a growth number is a steady climb or a single-year jump.

And if you want the other side of the table, we ran the same honest-metric approach on operators: which Alberta operators are actually closing out their wells, and which are falling behind.

All figures derived from environmental reports filed with the Alberta Energy Regulator, with year-by-year history from 2018; counts are a mid-2026 snapshot and recent years are still settling as reports are attributed. Report counts measure filing activity, not revenue, headcount, or work quality, and single-year jumps off a near-zero base typically reflect renames or acquisitions rather than organic growth.