Company lists · Data refreshed September 2026

Top 25 Environmental impact mitigation companies based in the United States

Name: Environmental impact mitigation companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 747 companies tracked

RevenueBase identified 747 environmental impact mitigation companies headquartered in the United States as of September 2026 and tracks 18,557 professional contacts across them, including 10,499 with verified work emails. Houston is the largest hub.

This list covers environmental impact mitigation companies 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

747Companies

18,557Contacts tracked

10,499Verified emails

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The 25 largest environmental impact mitigation companies based in the United States

Ranked by team size

Top 25 of 747 environmental impact mitigation companies 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 environmental impact mitigation companies: 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	Swca Environmental Consultants	Partial evidence	Phoenix, AZ, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,629 contacts →
	Partial evidence “Founded on a commitment to sound science and creative solutions, SWCA is a leader in environmental and management consulting services.” Source: RevenueBase Database · checked Sep 19, 2026
2	Montrose Environmental Group	Partial evidence	Little Rock, AR, United StatesHQ checked Sep 19, 2026	1,001-5,000	1,529 contacts →
	Partial evidence “Onterris (formerly Montrose Environmental Group) was one of the first to see environmental responsibility as not just an imperative but as a strategic asset.” Source: RevenueBase Database · checked Sep 19, 2026
3	Parametrix	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	501-1,000	880 contacts →
	Indirect evidence “At Parametrix, we help our clients imagine what's possible.” Source: RevenueBase Database · checked Sep 19, 2026
4	Environmental Science Associates	Partial evidence	San Francisco, CA, United StatesHQ checked Sep 19, 2026	501-1,000	732 contacts →
	Partial evidence “ESA is a 100% employee-owned environmental consulting firm.” Source: RevenueBase Database · checked Sep 19, 2026
5	Resource Environmental Solutions LLC	Partial evidence	Bellaire, TX, United StatesHQ checked Sep 19, 2026	501-1,000	677 contacts →
	Partial evidence “As the nation’s largest nature-based solutions company, RES (Resource Environmental Solutions) is restoring a resilient earth for a modern world, project by project.” Source: RevenueBase Database · checked Sep 19, 2026
6	EBI Consulting	Indirect evidence	Burlington, MA, United StatesHQ checked Sep 19, 2026	501-1,000	535 contacts →
	Indirect evidence “For 35 years we have been helping investors, lenders, owners, developers, contractors, and property managers reduce risk and optimize their built facilities, infrastructure and…” Source: RevenueBase Database · checked Sep 19, 2026
7	Rincon Consultants	Partial evidence	Ventura, CA, United StatesHQ checked Sep 19, 2026	501-1,000	479 contacts →
	Partial evidence “Rincon Consultants is a multi-disciplinary environmental sciences, planning, and engineering consulting firm that provides quality professional services to government and industry.” Source: RevenueBase Database · checked Sep 19, 2026
8	Groundwater & Environmental Services, INC	Partial evidence	Wall Township, NJ, United StatesHQ checked Sep 19, 2026	201-500	447 contacts →
	Partial evidence “We are Groundwater & Environmental Services, Inc, better known as GES.” Source: RevenueBase Database · checked Sep 19, 2026
9	AEI Consultants	Partial evidence	Walnut Creek, CA, United StatesHQ checked Sep 19, 2026	201-500	433 contacts →
	Partial evidence “AEI Consultants provides building, environmental, land and sustainability assessment and consulting services throughout North America.” Source: RevenueBase Database · checked Sep 19, 2026
10	Hydrogeologic, INC	Indirect evidence	Reston, VA, United StatesHQ checked Sep 19, 2026	501-1,000	430 contacts →
	Indirect evidence “HydroGeoLogic, Inc.(HGL) is an employee-owned company with over 36 years of experience developing innovative, effective, and sustainable engineering and remediation solutions to…” Source: RevenueBase Database · checked Sep 19, 2026
11	Environmental Consulting & Technology, Inc. ECT	Partial evidence	Gainesville, FL, United StatesHQ checked Sep 19, 2026	201-500	305 contacts →
	Partial evidence “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Source: RevenueBase Database · checked Sep 19, 2026
12	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	259 contacts →
	Partial evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 19, 2026
13	ARQ	Strong evidence	Greenwood Village, CO, United StatesHQ checked Sep 19, 2026	201-500	234 contacts →
	Strong evidence “Arq is a diversified, environmental technology company with products that enable a cleaner and safer planet while actively reducing our environmental impact.” Source: RevenueBase Database · checked Sep 19, 2026
14	Kleinschmidt Associates	Partial evidence	Pittsfield, ME, United StatesHQ checked Sep 19, 2026	201-500	218 contacts →
	Partial 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
15	Anew Climate	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	200 contacts →
	Indirect evidence “Anew Climate is a global leader of diverse climate solutions, bringing innovative products and services to the public and private sectors to help reduce or offset their carbon…” Source: RevenueBase Database · checked Sep 19, 2026
16	Normandeau Associates, INC	Indirect evidence	Bedford, NH, United StatesHQ checked Sep 19, 2026	201-500	189 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
17	VMC Group	Partial evidence	Bloomingdale, NJ, United StatesHQ checked Sep 19, 2026	51-200	187 contacts →
	Partial evidence “We design & build solutions that allow customers to better manage the negative environmental effects of air, noise, seismic, vibration, & shock.” Source: RevenueBase Database · checked Sep 19, 2026
18	Wra, INC	Strong evidence	San Rafael, CA, United StatesHQ checked Sep 19, 2026	51-200	183 contacts →
	Strong evidence “WRA is an environmental consultancy that’s making a net positive impact.” Source: RevenueBase Database · checked Sep 19, 2026
19	Terraphase Engineering INC	Partial evidence	Oakland, CA, United StatesHQ checked Sep 19, 2026	201-500	166 contacts →
	Partial evidence “Terraphase offers cost-effective solutions to complex environmental and engineering challenges.” Source: RevenueBase Database · checked Sep 19, 2026
20	Ecorp Consulting, INC	Indirect evidence	Rocklin, CA, United StatesHQ checked Sep 19, 2026	51-200	166 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
21	Keramida INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 19, 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 19, 2026
22	Quest Resource Management Group, A Qrhc Company Nasdaq Qrhc	Partial evidence	The Colony, TX, United StatesHQ checked Sep 19, 2026	51-200	147 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 19, 2026
23	Ensolum, LLC	Partial evidence	Dallas, TX, United StatesHQ checked Sep 19, 2026	51-200	136 contacts →
	Partial 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
24	PPM Consultants, INC	Partial evidence	Birmingham Office, AL, United StatesHQ checked Sep 19, 2026	51-200	118 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 19, 2026
25	Cascadia Consulting Group	Partial evidence	Seattle, WA, United StatesHQ checked Sep 19, 2026	51-200	110 contacts →
	Partial evidence “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Source: RevenueBase Database · checked Sep 19, 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 impact mitigation companies. 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 impact mitigation companies.
Partial evidence: Its own public description names part of environmental impact mitigation companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental impact mitigation companies. 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 747 environmental impact mitigation companies based in the United States

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Environmental impact mitigation companies based in the United States at a glance

As of Sep 19, 2026

56.6%Verified-email coverage

24.8Average contacts per company

1-10Median size (employees)

2.4%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

403

11-50

241

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 747 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 environmental impact mitigation companies, 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 impact mitigation companies”. 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 impact mitigation companies), 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 impact mitigation companies, 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, 10,499 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 environmental impact mitigation companies, 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 impact mitigation companies are there based in the United States?

RevenueBase identified 747 environmental impact mitigation companies 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?

Swca Environmental Consultants, headquartered in Phoenix, tops this list with the largest team on record.

Which city has the most environmental impact mitigation companies?

Houston leads with 18 headquartered companies, followed by New York (15) and Austin (10).

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 10,499 verified decision-maker contacts tracked across these 747 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.