Company lists · Data refreshed September 2026

Top 25 Carbon accounting firms based in the United States

Name: Carbon accounting firms based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 717 companies tracked

RevenueBase identified 717 carbon accounting firms headquartered in the United States as of September 2026 and tracks 6,852 professional contacts across them, including 2,994 with verified work emails. New York is the largest hub.

This list covers carbon accounting firms 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 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

717Companies

6,852Contacts tracked

2,994Verified emails

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The 25 largest carbon accounting firms based in the United States

Ranked by team size

Top 25 of 717 carbon accounting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to carbon accounting 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	Watershed	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 14, 2026	201-500	529 contacts →
	Indirect evidence “Watershed is the enterprise sustainability platform.” Source: RevenueBase Database · checked Sep 14, 2026
2	NUS Consulting Group	Indirect evidence	Park Ridge, NJ, United StatesHQ checked Sep 14, 2026	201-500	336 contacts →
	Indirect evidence “National Utility Service, Inc.” Source: RevenueBase Database · checked Sep 14, 2026
3	Cascade Energy	Indirect evidence	Portland, OR, United StatesHQ checked Sep 14, 2026	201-500	288 contacts →
	Indirect evidence “At Cascade Energy, we believe in better.” Source: RevenueBase Database · checked Sep 14, 2026
4	Carbon Direct	Partial evidence	New York, United StatesHQ checked Sep 14, 2026	51-200	172 contacts →
	Partial evidence “Carbon Direct is a trusted energy and climate solutions company that combines world-class scientific expertise, technical rigor, and market insights to help clients achieve their…” Source: RevenueBase Database · checked Sep 14, 2026
5	Keramida INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	152 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 14, 2026
6	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	Indirect evidence	The Colony, TX, United StatesHQ checked Sep 14, 2026	51-200	147 contacts →
	Indirect evidence “Quest Resource Management Group, a subsidiary of Quest Resource Holding Corporation (Nasdaq: QRHC), is a full-service environmental consulting and management company headquartered…” Source: RevenueBase Database · checked Sep 14, 2026
7	STOK	Indirect evidence	San Francisco, CA, United StatesHQ checked Sep 14, 2026	51-200	141 contacts →
	Indirect evidence “Stok leads organizations to decarbonize now.” Source: RevenueBase Database · checked Sep 14, 2026
8	RE Tech Advisors	Indirect evidence	Mclean, VA, United StatesHQ checked Sep 14, 2026	51-200	124 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 14, 2026
9	Cascadia Consulting Group	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 14, 2026	51-200	110 contacts →
	Indirect evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 14, 2026
10	Ecoengineers	Indirect evidence	Des Moines, IA, United StatesHQ checked Sep 14, 2026	51-200	109 contacts →
	Indirect evidence “EcoEngineers, an LRQA company, is a consulting, auditing, and advisory firm with an exclusive focus on the energy transition and decarbonization.” Source: RevenueBase Database · checked Sep 14, 2026
11	AKT Peerless	Indirect evidence	Saginaw, MI, United StatesHQ checked Sep 14, 2026	51-200	96 contacts →
	Indirect evidence “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Source: RevenueBase Database · checked Sep 14, 2026
12	Climeco	Indirect evidence	Houston, TX, United StatesHQ checked Sep 14, 2026	51-200	96 contacts →
	Indirect evidence “ClimeCo is an award-winning leader in decarbonization, empowering global organizations with customized sustainability pathways.” Source: RevenueBase Database · checked Sep 14, 2026
13	Verdani Partners	Indirect evidence	Carlsbad, CA, United StatesHQ checked Sep 14, 2026	51-200	89 contacts →
	Indirect evidence “Verdani Partners is a full service sustainability consulting firm specialized in corporate sustainability, LEED certification and greening and retrofitting existing buildings.” Source: RevenueBase Database · checked Sep 14, 2026
14	Group14 Engineering, PBC	Indirect evidence	Denver, CO, United StatesHQ checked Sep 14, 2026	11-50	75 contacts →
	Indirect evidence “Group14 Engineering is a Denver-based consulting firm committed to inspiring better buildings where people thrive.” Source: RevenueBase Database · checked Sep 14, 2026
15	Baumann Consulting	Partial evidence	Washington, DC, United StatesHQ checked Sep 14, 2026	51-200	63 contacts →
	Partial evidence “Baumann Consulting is driven to deliver solutions for a carbon-neutral real estate industry.” Source: RevenueBase Database · checked Sep 14, 2026
16	Greenplaces	Indirect evidence	Raleigh, NC, United StatesHQ checked Sep 14, 2026	51-200	62 contacts →
	Indirect evidence “Greenplaces helps businesses turn risk into a competitive advantage.” Source: RevenueBase Database · checked Sep 14, 2026
17	Brightworks Sustainability	Indirect evidence	Portland, OR, United StatesHQ checked Sep 14, 2026	51-200	61 contacts →
	Indirect evidence “Recognized for advanced subject matter expertise, wide-ranging technical resources, creative problem-solving, and excellence in professional practice, Brightworks Sustainability…” Source: RevenueBase Database · checked Sep 14, 2026
18	Greengen	Indirect evidence	Bethesda, MD, United StatesHQ checked Sep 14, 2026	11-50	60 contacts →
	Indirect evidence “GreenGen is a global leader in energy and sustainability solutions, empowering organizations to Operate in the Green®.” Source: RevenueBase Database · checked Sep 14, 2026
19	Carbonbetter	Indirect evidence	Austin, TX, United StatesHQ checked Sep 14, 2026	11-50	58 contacts →
	Indirect evidence “We believe that what’s good for our planet is good for business.” Source: RevenueBase Database · checked Sep 14, 2026
20	Partner Energy	Indirect evidence	Los Angeles, CA, United StatesHQ checked Sep 14, 2026	51-200	57 contacts →
	Indirect evidence “Partner Energy, Inc.” Source: RevenueBase Database · checked Sep 14, 2026
21	3r Sustainability	Indirect evidence	Pittsburgh, PA, United StatesHQ checked Sep 14, 2026	11-50	56 contacts →
	Indirect evidence “3R Sustainability is a women-owned business providing consulting services rooted in science, supported by data, and driven by innovation, education, and continual improvement…” Source: RevenueBase Database · checked Sep 14, 2026
22	Sustainable Investment Group SIG	Indirect evidence	Atlanta, GA, United StatesHQ checked Sep 14, 2026	11-50	52 contacts →
	Indirect evidence “Sustainable Investment Group, LLC (SIG) is a full-service sustainable building consulting firm that provides environmentally focused solutions to design, construction, and real…” Source: RevenueBase Database · checked Sep 14, 2026
23	Altura	Partial evidence	Newport Beach, CA, United StatesHQ checked Sep 14, 2026	51-200	47 contacts →
	Partial evidence “Altura is a new breed of engineering consulting firm, delivering everything it takes to guide owners to realizing climate and carbon goals by improving energy, environmental, and…” Source: RevenueBase Database · checked Sep 14, 2026
24	Growlity, INC	Indirect evidence	New York, NY, United StatesHQ checked Sep 14, 2026	11-50	47 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
25	Aeterra, LLC	Indirect evidence	Chicago, IL, United StatesHQ checked Sep 14, 2026	11-50	43 contacts →
	Indirect evidence “Aeterra is a full-service environmental and sustainability consulting firm that provides operating businesses and their owners with meaningful, practical, business-focused advice.” 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: carbon accounting 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 carbon accounting firms.
Partial evidence: Its own public description names part of carbon accounting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name carbon accounting 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 717 carbon accounting firms based in the United States

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Carbon accounting firms based in the United States at a glance

As of Sep 14, 2026

43.7%Verified-email coverage

9.6Average contacts per company

1-10Median size (employees)

6.6%Largest-city concentration · New York

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

525

11-50

149

51-200

201-500

501-1,000

1,001-5,000

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 717 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 carbon accounting 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 the United States whose own description of what they do matches “carbon accounting 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 carbon accounting 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 carbon accounting firms, 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, 2,994 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.

Carbon accounting firms by metro

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 carbon accounting 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 carbon accounting firms are there based in the United States?

RevenueBase identified 717 carbon accounting firms 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?

Watershed, headquartered in San Francisco, tops this list with the largest team on record.

Which city has the most carbon accounting firms?

New York leads with 47 headquartered companies, followed by Chicago (25) and Houston (24).

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 2,994 verified decision-maker contacts tracked across these 717 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.