Company lists · Data refreshed September 2026

Top 25 Environmental accounting firms based in the United States

Name: Environmental 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 2, 2026 312 companies tracked

RevenueBase identified 312 environmental accounting firms headquartered in the United States as of September 2026 and tracks 3,677 professional contacts across them, including 1,548 with verified work emails and 1,610 with mobile numbers. Houston is the largest hub.

This list covers environmental 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 2, 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 RevenueBase Smart Search rating on every row Refreshed Sep 2, 2026 86% judged on-target in blind review

312Companies

3,677Contacts tracked

1,548Verified emails

1,610Mobile numbers

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The 25 largest environmental accounting firms based in the United States

Ranked by team size

Top 25 of 312 environmental accounting firms based in the United States, ranked by team size, largest first. Data refreshed Sep 2, 2026. RevenueBase Smart Search rates how each company's information relates to environmental 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	APPL	Partial evidence	Clovis, CA, United States	n/a	232 contacts →
	Partial evidence “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Source: RevenueBase Database · checked Sep 2, 2026
2	Keramida INC	Indirect evidence	Chicago, IL, United States	51-200	150 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 2, 2026
3	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	Partial evidence	The Colony, TX, United States	51-200	149 contacts →
	Partial 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 2, 2026
4	Mostardi Platt	Partial evidence	Mendota Heights, MN, United States	51-200	137 contacts →
	Partial 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 2, 2026
5	PPM Consultants, INC	Partial evidence	Monroe, LA, United States	51-200	120 contacts →
	Partial evidence “PPM Consultants is an environmental and engineering consulting firm providing services to industrial, commercial, and governmental clients.” Source: RevenueBase Database · checked Sep 2, 2026
6	Cascadia Consulting Group	Partial evidence	Oakland, CA, United States	51-200	108 contacts →
	Partial evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 2, 2026
7	Techlaw	Partial evidence	Chantilly, VA, United States	201-500	106 contacts →
	Partial evidence “Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Source: RevenueBase Database · checked Sep 2, 2026
8	Hart & Hickman, PC	Partial evidence	Raleigh, NC, United States	51-200	101 contacts →
	Partial evidence “Hart & Hickman PC provides environmental consulting services to commercial, industrial, and governmental clients throughout the Southeast US.” Source: RevenueBase Database · checked Sep 2, 2026
9	Chambers Group, INC	Partial evidence	Costa Mesa, CA, United States	51-200	98 contacts →
	Partial evidence “Public agencies and businesses have been relying on Chambers Group to keep them in compliance with applicable federal, state, and/or local environmental laws, regulations, and…” Source: RevenueBase Database · checked Sep 2, 2026
10	A-Tech Consulting, INC	Indirect evidence	Orange, CA, United States	51-200	96 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 2, 2026
11	AKT Peerless	Partial evidence	Cheshire, CT, United States	51-200	95 contacts →
	Partial evidence “We are environmental consultants and redevelopment experts who are proud to help build sustainable communities.” Source: RevenueBase Database · checked Sep 2, 2026
12	Aarc Environmental	Partial evidence	Atlanta Atlanta, GA, United States	51-200	63 contacts →
	Partial evidence “As a leader in the environmental compliance services industry, AARC does more than just meeting the needs of clients today.” Source: RevenueBase Database · checked Sep 2, 2026
13	LEW Environmental	Partial evidence	New York, NY, United States	51-200	60 contacts →
	Partial evidence “THE ENVIRONMENTAL COMPANY LEW Environmental Services is proud to be part of the Mainline Environmental family of companies, alongside our sister organizations HSE Consulting and…” Source: RevenueBase Database · checked Sep 2, 2026
14	3r Sustainability	Indirect evidence	Pittsburgh, PA, United States	11-50	55 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 2, 2026
15	Spheros Environmental	Partial evidence	Lakewood, CO, United States	201-500	48 contacts →
	Partial evidence “Environmental insight for complex real-world decisions Spheros Environmental helps clients make clear, defensible decisions in complex environments.” Source: RevenueBase Database · checked Sep 2, 2026
16	Aeterra, LLC	Partial evidence	Boston, MA, United States	11-50	43 contacts →
	Partial 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 2, 2026
17	Sustainable Solutions Corporation	Partial evidence	Royersford, PA, United States	11-50	43 contacts →
	Partial evidence “Sustainable Solutions Corporation (SSC) helps organizations reduce costs, improve competitive advantage, and minimize environmental impact through end-to-end corporate…” Source: RevenueBase Database · checked Sep 2, 2026
18	Techlaw Consultants, INC	Indirect evidence	Chantilly, VA, United States	201-500	42 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 2, 2026
19	Sesco Group	Partial evidence	Indianapolis, IN, United States	11-50	40 contacts →
	Partial evidence “Founded in 1996 as an Environmental Investigation and Remediation company, SESCO Group (SESCO) has established a reputation for excellence in providing environmental consulting…” Source: RevenueBase Database · checked Sep 2, 2026
20	Peak Environmental, A Nova Group, GBC Company	Partial evidence	St Louis Park, MN, United States	11-50	38 contacts →
	Partial evidence “Peak Environmental, A Nova Group, GBC Company (Peak) is a full-service, forward-thinking environmental consulting firm serving clients from the petroleum, industrial, financial…” Source: RevenueBase Database · checked Sep 2, 2026
21	Soundearth Strategies, INC	Partial evidence	Tacoma, WA, United States	11-50	33 contacts →
	Partial evidence “SoundEarth is a 100% employee-owned environmental consulting firm with more than 40 dedicated and talented professionals working together to improve the environment in which we…” Source: RevenueBase Database · checked Sep 2, 2026
22	Governance & Accountability Institute, INC	Indirect evidence	New York, NY, United States	11-50	32 contacts →
	Indirect evidence “Governance & Accountability Institute is organized as the “Sustainability Headquarters™” for clients in the corporate community and in the investment and financial services sector.” Source: RevenueBase Database · checked Sep 2, 2026
23	Enviroforensics	Partial evidence	Indianapolis, IN, United States	51-200	30 contacts →
	Partial evidence “We’re a national full-service environmental consulting firm solving complex environmental issues.” Source: RevenueBase Database · checked Sep 2, 2026
24	VMX International	Partial evidence	Detroit, MI, United States	51-200	30 contacts →
	Partial evidence “VMX International is a women minority owned environmental consulting firm.” Source: RevenueBase Database · checked Sep 2, 2026
25	Davenport Engineering, INC	Indirect evidence	Torrance, CA, United States	11-50	29 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 2, 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: environmental 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 environmental accounting firms.
Partial evidence: Its own public description names part of environmental accounting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental 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 312 environmental accounting firms based in the United States

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Environmental accounting firms based in the United States at a glance

As of Sep 2, 2026

42.1%Verified-email coverage

43.8%Mobile-number coverage

11.8Average contacts per company

1-10Median size (employees)

3.8%Largest-city concentration · Houston

Sep 2, 2026Page data refreshed

Companies by employee count

1-10

182

11-50

103

51-200

201-500

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 environmental 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 “environmental 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 environmental 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 environmental 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, 1,548 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 2, 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 environmental 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 environmental accounting firms are there based in the United States?

RevenueBase identified 312 environmental 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?

APPL, headquartered in Clovis, tops this list with the largest team on record.

Which city has the most environmental accounting firms?

Houston leads with 12 headquartered companies, followed by Austin (6) and San Francisco (6).

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 1,548 verified decision-maker contacts tracked across these 312 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 2, 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.