Company lists · Data refreshed September 2026

Top 25 Power plant environmental compliance consultants based in the United States

Name: Power plant environmental compliance consultants based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 987 companies tracked

RevenueBase identified 987 company matches for power plant environmental compliance consultants associated with the United States as of September 2026 and tracks 17,297 professional contacts across them, including 8,699 with verified work emails. Houston is the largest hub.

This list covers company matches for power plant environmental compliance consultants associated with the United States, found by RevenueBase SmartSearch using the meaning of business descriptions in its company graph at Exact. Ranked by professionals tracked, largest first. Rows show recorded descriptions where available, Exact search membership and the snapshot date. Data refreshed September 20, 2026.

Published by RevenueBase, a B2B data infrastructure company. This list was built with RevenueBase SmartSearch, 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 SmartSearch · Exact Recorded Sep 20, 2026 How this list was built

987Companies

17,297Contacts tracked

8,699Verified emails

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The 25 largest power plant environmental compliance consultants based in the United States

Ranked by team size

Top 25 of 987 company matches for power plant environmental compliance consultants based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 20, 2026. The RevenueBase SmartSearch column shows Exact match membership in this saved search. Click a contact count to view that company's people. Totals use company locations recorded by RevenueBase; the displayed preview is a smaller selection.
#	Company	RevenueBase SmartSearch	Headquarters	Employees	Contacts
1	Barr Engineering CO	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 20, 2026	1,001-5,000	1,088 contacts →
	Exact match “Barr provides engineering and environmental consulting services to clients across the Midwest, throughout the Americas, and around the world.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
2	Alliance Technical Group	Exact match	Decatur, AL, United StatesHQ recorded Sep 20, 2026	1,001-5,000	956 contacts →
	Exact match “Alliance is a new kind of environmental services company-powered by innovation, focused on service, and committed to client success.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
3	Antea Group USA	Exact match	St. Paul, MN, United StatesHQ recorded Sep 20, 2026	1,001-5,000	658 contacts →
	Exact match “Antea Group is an international engineering and environmental consulting firm specializing in full-service solutions in the fields of environment, health and safety, and…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
4	Groundwater & Environmental Services, INC	Exact match	Wall Township, NJ, United StatesHQ recorded Sep 20, 2026	201-500	447 contacts →
	Exact match “We are Groundwater & Environmental Services, Inc, better known as GES.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
5	ROUX	Exact match	Islandia, NY, United StatesHQ recorded Sep 20, 2026	201-500	433 contacts →
	Exact match “Founded 40 years ago, Roux is recognized for being a highly effective, client-focused environmental consulting and management firm.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
6	Environmental Consulting & Technology, Inc. ECT	Exact match	Gainesville, FL, United StatesHQ recorded Sep 20, 2026	201-500	305 contacts →
	Exact match “Environmental Consulting & Technology, Inc.(ECT) is a multi-disciplinary environmental and sustainability consulting firm delivering strategy, permitting, design, and management…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
7	Picarro	Exact match	Santa Clara, CA, United StatesHQ recorded Sep 20, 2026	201-500	297 contacts →
	Exact match “Reducing emissions, detecting leaks, mitigating risk, optimizing operations, ensuring compliance and advancing research are some of the challenges facing our clients.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
8	Cascade Energy	Exact match	Portland, OR, United StatesHQ recorded Sep 20, 2026	201-500	288 contacts →
	Exact match “At Cascade Energy, we believe in better.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
9	Merjent	Exact match	Minneapolis, MN, United StatesHQ recorded Sep 20, 2026	201-500	264 contacts →
	Exact match “Merjent is an environmental, restoration, and engineering consulting firm with a long history serving the energy industry.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
10	Metiri Group	Exact match	Clovis, CA, United StatesHQ recorded Sep 20, 2026	n/a	233 contacts →
	Exact match “Appl Inc is an environmental services company based out of 908 N Temperance Ave, Clovis, CA, United States.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
11	Kleinschmidt Associates	Exact match	Pittsfield, ME, United StatesHQ recorded Sep 20, 2026	201-500	218 contacts →
	Exact match “At Kleinschmidt, we work primarily with energy companies and government agencies in North America to protect and enhance the environment without compromising performance.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
12	PEG	Exact match	Fairfax, VA, United StatesHQ recorded Sep 20, 2026	201-500	214 contacts →
	Exact match “PEG presents a comprehensive capacity for the evaluation and understanding of a broad base of energy and environmental sustainability related programs, policies and initiatives.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
13	Charah Solutions, INC	Exact match	Louisville, KY, United StatesHQ recorded Sep 20, 2026	501-1,000	211 contacts →
	Exact match “Based in Louisville, KY, Charah Solutions is a leading provider of mission-critical environmental services and byproduct sales to the power generation industry.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
14	Nuverra Environmental Solutions	Exact match	Scottsdale, AZ, United StatesHQ recorded Sep 20, 2026	501-1,000	201 contacts →
	Exact match “Nuverra Environmental Solutions is a company dedicated to the protection, enhancement and advancement of environmental solutions.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
15	Ecorp Consulting, INC	Exact match	Rocklin, CA, United StatesHQ recorded Sep 20, 2026	51-200	166 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
16	Cleanair Engineering	Exact match	Palatine, IL, United StatesHQ recorded Sep 20, 2026	51-200	152 contacts →
	Exact match “Since its founding in 1972, CleanAir has an established reputation for excellence on projects of all sizes, ranging from boiler, APC equipment and cooling tower efficiency testing…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
17	Mostardi Platt	Exact match	Elmhurst, IL, United StatesHQ recorded Sep 20, 2026	51-200	140 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
18	Ensolum, LLC	Exact match	Dallas, TX, United StatesHQ recorded Sep 20, 2026	51-200	136 contacts →
	Exact match “OUR MISSION is to combine sustainable environmental solutions with forward-thinking, cost-effective, innovative, and value-added technologies that balance our clients’ economic…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
19	Edge Engineering And Science, LLC	Exact match	Houston, TX, United StatesHQ recorded Sep 20, 2026	51-200	116 contacts →
	Exact match “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
20	Cascadia Consulting Group	Exact match	Seattle, WA, United StatesHQ recorded Sep 20, 2026	51-200	110 contacts →
	Exact match “Cascadia Consulting Group is a majority women-owned consulting firm specializing in environmental and sustainability solutions.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
21	Techlaw	Exact match	Chantilly, VA, United StatesHQ recorded Sep 20, 2026	201-500	104 contacts →
	Exact match “Established in 1983, TechLaw provides environmental and management consulting services to the public sector nationwide.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
22	Hart & Hickman, PC	Exact match	Charlotte, NC, United StatesHQ recorded Sep 20, 2026	51-200	103 contacts →
	Exact match “Hart & Hickman PC provides environmental consulting services to commercial, industrial, and governmental clients throughout the Southeast US.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
23	CK Associates Environmental Consultants	Exact match	Baton Rouge, LA, United StatesHQ recorded Sep 20, 2026	51-200	101 contacts →
	Exact match “CK Associates is an environmental consulting firm that is fully owned by its employees.” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
24	Chambers Group, INC	Exact match	Costa Mesa, CA, United StatesHQ recorded Sep 20, 2026	51-200	98 contacts →
	Exact match “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…” Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase
25	A-Tech Consulting, INC	Exact match	Orange, CA, United StatesHQ recorded Sep 20, 2026	51-200	97 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 20, 2026 · View company records in RevenueBase

RevenueBase SmartSearch

Describe a niche business in your own words. RevenueBase SmartSearch compares the meaning of your description with company business descriptions compiled in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit.

This list uses Exact for “power plant environmental compliance consultants”. Each Exact match badge shows membership in that saved search; it is not an individual similarity score or a service-quality rating. Recorded descriptions are shown where available.

Showing 25 of 987 power plant environmental compliance consultants based in the United States

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Power plant environmental compliance consultants based in the United States at a glance

As of Sep 20, 2026

50.3%Verified-email coverage

17.5Average contacts per company

1-10Median size (employees)

3.1%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

544

11-50

341

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 987 companies.

How this list was built

The recorded descriptions help you assess these company matches. Check a company’s website for its current services and locations.

Source: The RevenueBase company graph: 60 million companies and 398.9 million professional contacts resolved from primary sources, queried with RevenueBase SmartSearch, the natural-language company search available to every RevenueBase user.
What qualifies: Company records associated with the United States whose business descriptions match “power plant environmental compliance consultants” by meaning at the Exact setting. Descriptions are compiled in the RevenueBase company graph from public websites, profiles and company information where available; they are not guaranteed quotations from the company's website.
RevenueBase SmartSearch: Describe a niche company in your own words to find businesses by meaning. Exact, Similar, Related and Broad control the breadth of RevenueBase SmartSearch. This saved list uses Exact. Each row's Exact match badge shows inclusion in that search, not an individual score or a service-quality judgment.
Public preview: The public preview omits records without a verified work email. Where headquarters information is recorded, preview rows are also filtered to this page’s location. Dataset totals and geographic summaries describe the full matched records before these preview filters.
Match quality: RevenueBase's August 25, 2026 study assessed 4,198 description/company pairs across matching settings. The publisher reports 86% good or better at Exact. This evaluates the method across queries; it does not audit this individual list. Recorded company descriptions, where available, help you judge each match yourself. Read the full methodology: how the lists are built and what the study measures.
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 displayed company carries at least one verified work email. RevenueBase tracks 8,699 professional contacts with verified work emails across the full matched dataset. 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 20, 2026. Lists refresh periodically as the graph is re-checked.
Record context: Company records and descriptions can change. Check the company's website for its current services and locations.

Frequently asked

What is RevenueBase SmartSearch?

RevenueBase SmartSearch finds niche companies by the meaning of their business descriptions in the RevenueBase company graph. Exact, Similar, Related and Broad control how closely companies must fit your description. This list uses Exact for “power plant environmental compliance consultants”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many power plant environmental compliance consultants are there based in the United States?

RevenueBase identified 987 company matches for power plant environmental compliance consultants associated with the United States as of September 2026, using the meaning of business descriptions at Exact. This is the recorded matched set in the RevenueBase company graph.

What is the largest company on this list?

Barr Engineering CO tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most power plant environmental compliance consultants?

Houston leads with 31 company records, followed by Denver (16) and Chicago (14).

How do I get contact information for these companies?

A free RevenueBase account lets you run this exact search and work limited free results with 500 credits to start. Upgrading provides access to the 8,699 professional contacts with verified work emails tracked across these 987 companies; direct dials are available where recorded.

How current is this list?

The list refreshes periodically as the company graph is re-checked. This page's figures were pulled on September 20, 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 SmartSearch, 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.