Company lists · Data refreshed September 2026

Top 25 Ecological consulting firms based in Denver, United States

Name: Ecological consulting firms based in Denver, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 44 companies tracked

RevenueBase identified 44 ecological consulting firms headquartered in Denver, United States as of September 2026 and tracks 1,635 professional contacts across them, including 839 with verified work emails. Houston is the largest hub.

This list covers ecological consulting firms headquartered in Denver, United States, matched on what each company actually does as described in its own words. Ranked by team size, largest first. Every row shows the company's own description, its RevenueBase Smart Search rating, and when it was last checked. Data refreshed September 14, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase Smart Search, the natural-language company search RevenueBase customers use to build their own targeted lists and unlock verified emails and direct dials at the companies on them. How these lists are built and judged.

How to read this list HQ checked on every row RevenueBase Smart Search rating on every row Refreshed Sep 14, 2026 86% judged on-target in blind review

44Companies

1,635Contacts tracked

839Verified emails

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The 25 largest ecological consulting firms based in Denver, United States

Ranked by team size

Top 25 of 44 ecological consulting firms based in Denver, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to ecological consulting firms: strong evidence (its own description names it), partial (names part of it), indirect (matched on the rest of its profile rather than the description shown). Click a contact count to view that company's people.
#	Company	RevenueBase Smart Search	Headquarters	Employees	Contacts
1	Knight Piesold	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1,001-5,000	1,231 contacts →
	Partial evidence “Knight Piésold is an employee-owned, global consulting firm providing specialist services to the mining, power, water resources, and infrastructure industries.” Source: RevenueBase Database · checked Sep 14, 2026
2	Group14 Engineering, PBC	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	11-50	75 contacts →
	Partial evidence “Group14 Engineering is a Denver-based consulting firm committed to inspiring better buildings where people thrive.” Source: RevenueBase Database · checked Sep 14, 2026
3	Spheros Environmental	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	201-500	48 contacts →
	Indirect evidence “Environmental insight for complex real-world decisions Spheros Environmental helps clients make clear, defensible decisions in complex environments.” Source: RevenueBase Database · checked Sep 14, 2026
4	Ayuda Companies	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	51-200	45 contacts →
	Indirect evidence “Established in 2002, Ayuda has successfully performed $300M+ in government and commercial contracts.” Source: RevenueBase Database · checked Sep 14, 2026
5	Quandary Consultants	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	51-200	40 contacts →
	Partial evidence “Quandary Consultants, LLC (QC) is an environmental and regulatory consulting company.” Source: RevenueBase Database · checked Sep 14, 2026
6	EFCG	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	11-50	28 contacts →
	Partial evidence “Founded in 1990, the Environmental Financial Consulting Group (EFCG) is a global specialized M&A advisor and management consultant to Architecture, Engineering, and Consulting…” Source: RevenueBase Database · checked Sep 14, 2026
7	Lithos Paleontology And Cultural Resource Consultants	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	51-200	22 contacts →
	Indirect evidence “Lithos stands as a premier consultancy specializing in comprehensive paleontological and archaeological resource management.” Source: RevenueBase Database · checked Sep 14, 2026
8	Quest Environmental	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	11-50	15 contacts →
	Indirect evidence “At QUEST Environmental, we're dedicated to ensuring you live and work in the safest, healthiest environments possible.” Source: RevenueBase Database · checked Sep 14, 2026
9	Solum Consulting Group	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	15 contacts →
	Indirect evidence “The environment and sustainability are key considerations across the mining, energy and resources sectors.” Source: RevenueBase Database · checked Sep 14, 2026
10	Stream Landscape Architecture Planning	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Partial evidence “Stream Landscape Architecture and Planning is a professional landscape architecture design consulting firm located in Denver, Colorado.” Source: RevenueBase Database · checked Sep 14, 2026
11	Environmental Technical Solutions, LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	9 contacts →
	Indirect evidence “ETS provides a dynamic team of experts needed to support a wide range of environmental services.” Source: RevenueBase Database · checked Sep 14, 2026
12	Soli Technical, LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	7 contacts →
	Indirect evidence “Soli brings decades of environmental and engineering experience to solve your problems in a cost effective, practical, and timely manner.” Source: RevenueBase Database · checked Sep 14, 2026
13	Fielding Hill, LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	7 contacts →
	Indirect evidence “Navigating Energy Regulations with Expertise - At Fielding Hill, we specialize in guiding energy sector clients through the complexities of regulatory, environmental, and…” Source: RevenueBase Database · checked Sep 14, 2026
14	Devoe Law, LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence “For over 20 years, DeVoe law has focused on regulatory and environmental compliance and litigation, natural resources law, water rights, land use and real estate law, and…” Source: RevenueBase Database · checked Sep 14, 2026
15	Slosky & Company	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
16	Bristlecone Ecology	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
17	Sustainability Core Advisors, INC	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “Sustainability Core Advisors is a consulting firm focused primarily on mid-market companies, with an emphasis on helping them achieve the “Triple Bottom Line:” social…” Source: RevenueBase Database · checked Sep 14, 2026
18	Swift Operating Partners LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence “SWIFT Operating Partners is proud to offer an extensive range of environmental services.” Source: RevenueBase Database · checked Sep 14, 2026
19	Kavi Consulting Services	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Indirect evidence “Creating true and equitable sustainability for organizations, the people they care for, and the planet by building fully integrated ESG programs.” Source: RevenueBase Database · checked Sep 14, 2026
20	Jodi Stemler Consulting	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “Jodi Stemler Consulting focuses on the nexus between policy and communications for the natural resource conservation community and outdoor industry.” Source: RevenueBase Database · checked Sep 14, 2026
21	Terranext LLC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	51-200	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
22	Acclivity Associates	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	11-50	1 contacts →
	Partial evidence “Acclivity Associates is a planning and management consulting firm committed to creating safe, sustainable, and resilient communities.” Source: RevenueBase Database · checked Sep 14, 2026
23	AIR Basics, INC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
24	Andale Energy Consulting	Partial evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Partial evidence “Andale Energy Consulting brings decades of land, regulatory, and stakeholder engagement expertise to the planning, permitting, and execution phases of your project.” Source: RevenueBase Database · checked Sep 14, 2026
25	Megannum, INC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026

RevenueBase Smart Search

RevenueBase Smart Search assesses information from a company’s LinkedIn profile, information supplied directly by the company, its website, and other publicly available sources. It uses that information to rate how closely the company relates to this list’s category: ecological consulting firms. Every row carries its rating and the description the rating was read from, so each one can be checked rather than taken on trust.

Strong evidence: The company's own public description of its business names ecological consulting firms.
Partial evidence: Its own public description names part of ecological consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name ecological consulting firms. The match rests on the rest of the company's public profile rather than the one sentence quoted here, so this is the rating to check first.

RevenueBase Smart Search is how these lists are built: RevenueBase's data engine and AI assemble the companies that match a category defined in a user's own words, so a list can be about what companies actually do rather than about whichever industry code they were filed under.

Showing 25 of 44 ecological consulting firms based in Denver, United States

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Ecological consulting firms based in Denver, United States at a glance

As of Sep 14, 2026

51.3%Verified-email coverage

37.2Average contacts per company

1-10Median size (employees)

202.3%Largest-city concentration · Houston

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Denver, so it is reported there. Company counts and contact totals on this page are exact for Denver, over 44 companies.

How this list was built

Company categories are rarely black and white. RevenueBase reads each company's own description of its business to decide whether it belongs among ecological consulting firms, so some rows will be adjacent to the category rather than pure plays. The description and RevenueBase Smart Search rating on every row are there so you can check each match yourself.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase Smart Search, the natural-language company search available to every RevenueBase user.
What qualifies: Companies headquartered in Denver, United States whose own description of what they do matches “ecological consulting firms”. Matching reads each company's description, not its industry code or its name.
RevenueBase Smart Search: RevenueBase Smart Search is how this list is assembled and how each row is rated. RevenueBase's data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to a category defined in a user's own words. Each row is rated strong evidence (its own description names ecological consulting firms), partial evidence (it names part of the category) or indirect evidence (the description shown names none of it and the match rests on the rest of the company's profile). The description supporting each rating is quoted on the row.
What we exclude: Companies whose own description does not clearly place them among ecological consulting firms, and records with no verified work email. Companies headquartered outside Denver are excluded even when they keep an office there.
Match quality: In blind human judging of this matching method, 86% of matched companies were on target. Expect roughly 1 in 7 rows to be adjacent to the category rather than a pure play. Every row shows the company's own description and its RevenueBase Smart Search rating so you can judge each match yourself. Read the full methodology: how the lists are built, how the judging worked, and what the figure means.
Ranking: Team size, largest first: companies are ordered by the number of professionals RevenueBase tracks at each one. Employee ranges shown are reported bands, for context.
Verification: Every listed company carries at least one verified work email, 839 across the full list. Contacts re-verify on a rolling cadence, and each contact's own verification date is shown inside RevenueBase.
Refresh: This page's figures were pulled from the company graph on September 14, 2026. Lists refresh periodically as the graph is re-checked.
Corrections: Wrong category, wrong headquarters, or a company that has closed? Use “Report an issue” on any row. Reports go to the RevenueBase Data Team and feed back into the company graph.

Ecological consulting firms by metro in the United States

Frequently asked

What is RevenueBase Smart Search?

RevenueBase Smart Search is how RevenueBase decides which companies belong on this list and how strongly each one fits. Its data engine and AI assess a company's LinkedIn profile, information supplied directly by the company, its website and other publicly available information, then relate it to the category the list is about. Each row is rated strong evidence when the company's own description names ecological consulting firms, partial evidence when it names part of the category, and indirect evidence when the description shown names none of it and the match rests on the rest of the company's profile.

How many ecological consulting firms are there based in Denver, United States?

RevenueBase identified 44 ecological consulting firms headquartered in Denver, United States as of September 2026, matched on each company's own description of what it does rather than its industry code.

What is the largest company on this list?

Knight Piesold, headquartered in Denver, tops this list with the largest team on record.

Which city has the most ecological consulting firms?

Houston leads with 89 headquartered companies, followed by New York (70) and Seattle (65).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work the top results, verified emails and direct dials included. Upgrading unlocks all 839 verified decision-maker contacts tracked across these 44 companies.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 14, 2026.

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About this data

RevenueBase is a B2B data infrastructure company. Its company graph covers 60 million companies and 398.9 million professional contacts, with emails verified on a rolling cadence rather than scraped once and left to decay. These company lists are generated directly from that graph with RevenueBase Smart Search, the same natural-language company search every RevenueBase user has: describe a market in plain words, get the companies that match, and add verified emails and direct dials for the people at them. It is the same data that powers RevenueBase's B2B data products, and a free account includes 500 credits to start. How these lists are built and judged.