Company lists · Data refreshed September 2026

Top 25 Compliance carbon consultants based in the United States

RevenueBase identified 1,151 compliance carbon consultants headquartered in the United States as of September 2026 and tracks 17,225 professional contacts across them, including 8,245 with verified work emails. Houston is the largest hub.

This list covers compliance carbon consultants headquartered in the 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 19, 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 19, 2026 86% judged on-target in blind review
1,151Companies
17,225Contacts tracked
8,245Verified emails
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The 25 largest compliance carbon consultants based in the United States

Ranked by team size
Top 25 of 1,151 compliance carbon consultants based in the United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to compliance carbon consultants: 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.
#CompanyRevenueBase Smart SearchHeadquartersEmployeesContacts
1Indirect evidenceDecatur, AL, United StatesHQ checked Sep 19, 20261,001-5,000956 contacts →

Indirect evidence

“Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.”

Source: RevenueBase Database · checked Sep 19, 2026
2Partial evidenceOakland, CA, United StatesHQ checked Sep 19, 2026201-500772 contacts →

Partial evidence

“Our mission is simple - to combat climate change through market-based, cost-effective energy, carbon, and water management solutions that make big impacts.”

Source: RevenueBase Database · checked Sep 19, 2026
3Indirect evidenceSt Paul, MN, United StatesHQ checked Sep 19, 20261,001-5,000658 contacts →

Indirect evidence

“Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…”

Source: RevenueBase Database · checked Sep 19, 2026
4Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 19, 2026201-500529 contacts →

Indirect evidence

“Watershed is the enterprise sustainability platform.”

Source: RevenueBase Database · checked Sep 19, 2026
5Partial evidenceArlington, VA, United StatesHQ checked Sep 19, 2026201-500474 contacts →

Partial evidence

“At Enhesa we empower the world’s largest businesses to achieve compliance, manage risk, and drive sustainability with clear, actionable insights.”

Source: RevenueBase Database · checked Sep 19, 2026
6Indirect evidenceWall Township, NJ, United StatesHQ checked Sep 19, 2026201-500447 contacts →

Indirect evidence

“We are Groundwater & Environmental Services, Inc, better known as GES.”

Source: RevenueBase Database · checked Sep 19, 2026
7Indirect evidenceIslandia, NY, United StatesHQ checked Sep 19, 2026201-500433 contacts →

Indirect evidence

“Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.”

Source: RevenueBase Database · checked Sep 19, 2026
8Indirect evidenceIrvine, CA, United StatesHQ checked Sep 19, 2026201-500383 contacts →

Indirect evidence

“We are Trio – built from Edison Energy, Alfa Energy, and Altenex Energy.”

Source: RevenueBase Database · checked Sep 19, 2026
9Indirect evidenceLong Beach, CA, United StatesHQ checked Sep 19, 2026201-500375 contacts →

Indirect evidence

“P2S has brought forward-thinking, sustainable engineering solutions to California, the Pacific Northwest, and beyond, for over 30 years.”

Source: RevenueBase Database · checked Sep 19, 2026
10Indirect evidencePark Ridge, NJ, United StatesHQ checked Sep 19, 2026201-500336 contacts →

Indirect evidence

“National Utility Service, Inc.”

Source: RevenueBase Database · checked Sep 19, 2026
11Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 19, 2026201-500324 contacts →

Indirect evidence

“3Degrees is a leading global climate solutions provider, pioneer of environmental markets, and Certified B Corporation.”

Source: RevenueBase Database · checked Sep 19, 2026
12Indirect evidencePortland, OR, United StatesHQ checked Sep 19, 2026201-500288 contacts →

Indirect evidence

“At Cascade Energy, we believe in better.”

Source: RevenueBase Database · checked Sep 19, 2026
13Indirect evidenceLancaster, NY, United StatesHQ checked Sep 19, 20265,001-10,000278 contacts →

Indirect evidence

“E&E is now WSP USA.”

Source: RevenueBase Database · checked Sep 19, 2026
14Indirect evidenceClovis, CA, United StatesHQ checked Sep 19, 2026n/a233 contacts →

Indirect evidence

“Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.”

Source: RevenueBase Database · checked Sep 19, 2026
15Indirect evidencePittsfield, ME, United StatesHQ checked Sep 19, 2026201-500218 contacts →

Indirect evidence

“At Kleinschmidt, we work primarily with energy companies and government agencies in North America to protect and enhance the environment without compromising performance.”

Source: RevenueBase Database · checked Sep 19, 2026
16Indirect evidenceFairfax, VA, United StatesHQ checked Sep 19, 2026201-500214 contacts →

Indirect evidence

“PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.”

Source: RevenueBase Database · checked Sep 19, 2026
17Indirect evidenceRocklin, CA, United StatesHQ checked Sep 19, 202651-200166 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 19, 2026
18Indirect evidenceIndianapolis, IN, United StatesHQ checked Sep 19, 202651-200152 contacts →

Indirect evidence

“Founded in 1988, KERAMIDA is a multidisciplinary Sustainability, EHS & Engineering consulting firm grounded in evidence-based research and development.”

Source: RevenueBase Database · checked Sep 19, 2026
19Indirect evidenceSan Francisco, CA, United StatesHQ checked Sep 19, 202651-200141 contacts →

Indirect evidence

“Stok leads organizations to decarbonize now.”

Source: RevenueBase Database · checked Sep 19, 2026
20Indirect evidenceElmhurst, IL, United StatesHQ checked Sep 19, 202651-200140 contacts →

Indirect evidence

“Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…”

Source: RevenueBase Database · checked Sep 19, 2026
21Indirect evidenceDallas, TX, United StatesHQ checked Sep 19, 202651-200136 contacts →

Indirect evidence

“OUR MISSION is to combine sustainable environmental solutions with forward-thinking, cost-effective, innovative, and value-added technologies that balance our clients’ economic…”

Source: RevenueBase Database · checked Sep 19, 2026
22Indirect evidenceMonroe, OH, United StatesHQ checked Sep 19, 2026201-500134 contacts →

Indirect evidence

Source: RevenueBase Database · checked Sep 19, 2026
23Indirect evidenceNew York, NY, United StatesHQ checked Sep 19, 202611-50133 contacts →

Indirect evidence

“At OnePointFive we solve your sustainability focused business challenges by empowering your organization with expert-led solutions, embedded training, and cutting edge tools to…”

Source: RevenueBase Database · checked Sep 19, 2026
24Indirect evidenceMclean, VA, United StatesHQ checked Sep 19, 202651-200124 contacts →

Indirect evidence

“RE Tech Advisors, a Legence Company, offers an integrated suite of solutions designed to drive building performance, decrease costs, and overcome any project challenge.”

Source: RevenueBase Database · checked Sep 19, 2026
25Indirect evidenceSeattle, WA, United StatesHQ checked Sep 19, 202651-200110 contacts →

Indirect evidence

“Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.”

Source: RevenueBase Database · checked Sep 19, 2026

Showing 25 of 1,151 compliance carbon consultants based in the United States

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Compliance carbon consultants based in the United States at a glance

As of Sep 19, 2026
47.9%Verified-email coverage
15.0Average contacts per company
1-10Median size (employees)
4.0%Largest-city concentration · Houston
Sep 19, 2026Page data refreshed

Companies by employee count

1-10
766
11-50
286
51-200
70
201-500
22
501-1,000
2
1,001-5,000
4
5,001-10,000
1

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 1,151 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 compliance carbon consultants, 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 the United States whose own description of what they do matches “compliance carbon consultants”. 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 compliance carbon consultants), 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 compliance carbon consultants, and records with no verified work email. Companies headquartered outside United States 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, 8,245 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 19, 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.

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 compliance carbon consultants, 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 compliance carbon consultants are there based in the United States?

RevenueBase identified 1,151 compliance carbon consultants headquartered in the 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?

Alliance Technical Group, headquartered in Decatur, tops this list with the largest team on record.

Which city has the most compliance carbon consultants?

Houston leads with 46 headquartered companies, followed by New York (46) and Chicago (30).

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 8,245 verified decision-maker contacts tracked across these 1,151 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 19, 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.