Company lists · Data refreshed September 2026

Top 12 Environmental engineering firms based in Pittsburgh, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 16, 2026 26 companies tracked

RevenueBase identified 26 company matches for environmental engineering firms associated with Pittsburgh, United States as of September 2026 and tracks 4,981 professional contacts across them, including 3,272 with verified work emails. Across the United States, Houston is the largest hub for this category (138 companies); Pittsburgh has 26.

This list covers company matches for environmental engineering firms associated with Pittsburgh, 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 16, 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 16, 2026 How this list was built

26Companies

4,981Contacts tracked

3,272Verified emails

Explore this list → Free signup · no credit card · 500 free credits

The 12 largest environmental engineering firms based in Pittsburgh, United States

Ranked by team size

Top 12 of 26 company matches for environmental engineering firms based in Pittsburgh, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 16, 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	Michael Baker International	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	5,001-10,000	4,362 contacts →
	Exact match “Michael Baker International is a leading provider of engineering, consulting, and technology services spanning four Verticals: Infrastructure, Places and Facilities, Federal and…” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
2	Gateway Engineers	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	201-500	201 contacts →
	Exact match “Gateway Engineers is a full-service civil engineering firm headquartered in Pittsburgh, PA.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
3	Rizzo International	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	51-200	165 contacts →
	Exact match “RIZZO International, Inc.(RIZZO) is a global engineering and consulting firm headquartered in Pittsburgh, Pennsylvania US.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
4	A&a Consultants, INC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	11-50	39 contacts →
	Exact match “About A&A Consultants A&A provides comprehensive engineering services to private firms, governmental agencies and large corporations.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
5	KLH Engineers, INC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	51-200	37 contacts →
	Exact match “Since 1982, KLH Engineers, Inc.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
6	Sci-Tek Consultants, INC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	11-50	37 contacts →
	Exact match “COMPANY DESCRIPTION Sci-Tek Consultants, Inc.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
7	D'appolonia Engineering	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	11-50	32 contacts →
	Exact match “Founded in 1956, D'APPOLONIA has grown to be an industry leader in providing consulting engineering services.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
8	Cosmos Technologies, INC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	11-50	23 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
9	Collective Efforts, LLC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	11-50	15 contacts →
	Exact match “Collective Efforts, LLC is a women-owned, civil and environmental engineering consulting firm.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
10	Sheesley Associates	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	1-10	7 contacts →
	Exact match “Sheesley + Associates, a Certified WBE and a Registered PA DOT Business Partner, is a professional services firm specializing in engineering, environmental, and aviation.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
11	Iams Consulting LLC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	11-50	5 contacts →
	Exact match “Iams Consulting LLC provides high quality, innovative mechanical, electrical, plumbing and fire protection engineering services.” Recorded in the RevenueBase company graph · Sep 16, 2026 · View company records in RevenueBase
12	Garvin Boward Beitko Engineering, INC	Exact match	Pittsburgh, PA, United StatesHQ recorded Sep 16, 2026	1-10	1 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 16, 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 engineering 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 12 of 26 environmental engineering firms based in Pittsburgh, United States

See the full list, filter by size, metro and specialty, and access 3,272 tracked professional contacts with verified work emails. Direct dials are available where recorded.

Free signup · no credit card

View the full list →

Environmental engineering firms based in Pittsburgh, United States at a glance

As of Sep 16, 2026

65.7%Verified-email coverage

191.6Average contacts per company

11-50Median size (employees)

Sep 16, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

5,001-10,000

Email recency for this list is measured across the whole United States list rather than for Pittsburgh, so it is reported there. Company counts and contact totals on this page are exact for Pittsburgh, over 26 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 Pittsburgh, United States whose business descriptions match “environmental engineering 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 3,272 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 16, 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 engineering 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 engineering firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental engineering firms are there based in Pittsburgh, United States?

RevenueBase identified 26 company matches for environmental engineering firms associated with Pittsburgh, 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?

Michael Baker International 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 engineering firms?

Houston leads the United States with 138 company records, followed by New York (101) and Austin (73). Pittsburgh has 26.

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 3,272 professional contacts with verified work emails tracked across these 26 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 16, 2026.

Ready to reach these companies? Verified emails and direct dials for all 26 environmental engineering firms based in Pittsburgh, United States. Start with a free account, no credit card.

Download this list →

Related lists

Environmental engineering firms by geography

Browse the directory

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.