Company lists · Data refreshed October 2026

Top 19 Environmental consulting firms based in St. Louis, United States

Name: Environmental consulting firms based in St. Louis, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Oct 1, 2026 29 companies tracked

RevenueBase identified 29 company matches for environmental consulting firms associated with St. Louis, United States as of October 2026 and tracks 1,502 professional contacts across them, including 459 with verified work emails. Across the United States, Houston is the largest hub for this category (145 companies); St. Louis has 29.

This list covers company matches for environmental consulting firms associated with St. Louis, 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 October 1, 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 Oct 1, 2026 How this list was built

29Companies

1,502Contacts tracked

459Verified emails

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The 19 largest environmental consulting firms based in St. Louis, United States

Ranked by team size

Top 19 of 29 company matches for environmental consulting firms based in St. Louis, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Oct 1, 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	Environmental Restoration LLC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	201-500	273 contacts →
	Exact match “Environmental Restoration LLC (ER) is 100% employee-owned and provides Environmental Site Remediation, Construction and Emergency Response services for hazardous waste materials…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
2	Trileaf Corporation	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	201-500	211 contacts →
	Exact match “Quality work and quick responses - Trileaf gives you both.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
3	Penta Engineering Corporation	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	51-200	118 contacts →
	Exact match “PENTA Engineering Corporation is an international, multidisciplinary firm providing comprehensive consulting and design/build solutions to the cement, lime, industrial minerals…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
4	Geotechnology, LLC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	201-500	117 contacts →
	Exact match “Geotechnology, LLC provides geotechnical engineering, environmental sciences, geophysics, construction materials testing, non-destructive testing, water resource management and…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
5	Sitex, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	51-200	54 contacts →
	Exact match “A full-service provider of industrial and environmental health & safety services SITEX saves lives.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
6	O6 Environmental Services	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	51-200	49 contacts →
	Exact match “O6 Environmental, LLC (O6 ENV) is Small Business Enterprise (SBE) under the North American Industry Classification System Code 562910 offering comprehensive hazardous waste…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
7	Professional Environmental Engineers, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	11-50	41 contacts →
	Exact match “PE is a full-service environmental consulting firm incorporated in 1997 and specializing in cost-effective environmental solutions for both government and commercial clientele.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
8	Spirtas Worldwide An EJ Spirtas Group, LLC Company	Exact match	St. Louis, United StatesHQ recorded Oct 1, 2026	11-50	35 contacts →
	Exact match “Headquartered in St Louis (Creve Coeur), Missouri, our company is a nationally recognized, innovative management consulting firm specializing in Construction, Demolition…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
9	Environmental Management Alternatives, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	11-50	15 contacts →
	Exact match “Environmental Management Alternatives LLC.(EMA) was incorporated in the state of Missouri in March 1997 and has over 20 years experience with: Industrial Chemicals, Waste…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
10	Rooftech Consulting, INC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	11-50	14 contacts →
	Exact match “RoofTech Consulting Inc.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
11	Wellington Environmental	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	51-200	11 contacts →
	Exact match “Wellington Environmental has been in business for over 30 years and serves the Midwestern United States, including all of Missouri and Illinois.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
12	Aton Environmental	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	6 contacts →
	Exact match “ATON provides integrated environmental, health and safety, and real estate transaction support services to commercial, industrial, and institutional customers throughout North…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
13	Enpaq, LLC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	6 contacts →
	Exact match “ENPAQ, LLC is a certified MBE/DBE firm that provides quality environmental services to the St.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
14	Blackrock Consulting LLC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	2 contacts →
	Exact match “Blackrock Consulting is a local, majority-woman owned business with expertise ranging from government relations and public policy to environmental sustainability and community…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
15	Alkemeyer & Associates, LLC	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	2 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
16	Riverfront Safety & Health	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	2 contacts →
	Exact match “RSH is a full service Environmental, Safety & Health consulting firm dedicated to ensuring that YOUR MISSION is OUR MISSION!” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
17	Heather Stork Compliance Services, LLC	Exact match	St. Louis, United StatesHQ recorded Oct 1, 2026	1-10	1 contacts →
	Exact match “Heather Stork Compliance Services, LLC (HSCS) is a certified women-owned, small business enterprise that provides environmental, health and safety (EHS) compliance and consulting…” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
18	Envirostaff	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	1 contacts →
	Exact match “EnviroStaff is a division of LGC that focuses on making placements in the environmental industry.” Recorded in the RevenueBase company graph · Oct 1, 2026 · View company records in RevenueBase
19	Menke Consulting	Exact match	St. Louis, MO, United StatesHQ recorded Oct 1, 2026	1-10	1 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Oct 1, 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 “environmental consulting firms”. 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 19 of 29 environmental consulting firms based in St. Louis, United States

See the full list, filter by size, metro and specialty, and access 459 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Environmental consulting firms based in St. Louis, United States at a glance

As of Oct 1, 2026

30.6%Verified-email coverage

51.8Average contacts per company

11-50Median size (employees)

Oct 1, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured across the whole United States list rather than for St. Louis, so it is reported there. Company counts and contact totals on this page are exact for St. Louis, over 29 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 St. Louis, United States whose business descriptions match “environmental consulting firms” 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 459 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 October 1, 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.

Environmental consulting firms by metro in the United States

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 “environmental consulting firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental consulting firms are there based in St. Louis, United States?

RevenueBase identified 29 company matches for environmental consulting firms associated with St. Louis, United States as of October 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?

Environmental Restoration LLC tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city in the United States has the most environmental consulting firms?

Houston leads the United States with 145 company records, followed by New York (124) and Seattle (84). St. Louis has 29.

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 459 professional contacts with verified work emails tracked across these 29 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 October 1, 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.