Company lists · Data refreshed September 2026

Top 22 Environmental liability law firms based in Philadelphia, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 28, 2026 31 companies tracked

RevenueBase identified 31 company matches for environmental liability law firms associated with Philadelphia, United States as of September 2026 and tracks 4,181 professional contacts across them, including 1,872 with verified work emails. Across the United States, New York is the largest hub for this category (84 companies); Philadelphia has 31.

This list covers company matches for environmental liability law firms associated with Philadelphia, 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 28, 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 28, 2026 How this list was built

31Companies

4,181Contacts tracked

1,872Verified emails

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The 22 largest environmental liability law firms based in Philadelphia, United States

Ranked by team size

Top 22 of 31 company matches for environmental liability law firms based in Philadelphia, United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Sep 28, 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	Ballard Spahr LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,682 contacts →
	Exact match “Ballard Spahr LLP, an Am Law 100 law firm with more than 750 lawyers in 19 U.S.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
2	Marshall Dennehey	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	1,001-5,000	1,147 contacts →
	Exact match “Welcome to our company page!” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
3	Post & Schell, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	201-500	336 contacts →
	Exact match “For over 50 years, Post & Schell’s attorneys have combined the operational knowledge and insight into the industries they represent with creative legal solutions – and helped…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
4	Margolis Edelstein	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	201-500	277 contacts →
	Exact match “Margolis Edelstein was founded in Philadelphia over 65 years ago.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
5	Rawle & Henderson LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	51-200	204 contacts →
	Exact match “Rawle & Henderson, LLP, is a Mid-Atlantic regional law firm whose attorneys engage in civil trial litigation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
6	Berger Montague	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	51-200	162 contacts →
	Exact match “Berger Montague is one of the nation’s preeminent law firms focusing on complex civil litigation, class actions, and mass torts.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
7	Goldberg, Miller & Rubin	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	51-200	90 contacts →
	Exact match “Goldberg, Miller & Rubin has built a solid foundation in civil litigation with several hundred defense verdicts and hundreds more defense arbitration awards.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
8	Locks LAW Firm	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	61 contacts →
	Exact match “The Locks Law Firm is a premier plaintiff's trial firm, litigating cases in Pennsylvania, New Jersey, New York, and the rest of the nation.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
9	Wilbraham, Lawler & Buba	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	51-200	50 contacts →
	Exact match “The attorneys at Wilbraham, Lawler & Buba, P.C.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
10	The Rothenberg LAW Firm LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	51-200	40 contacts →
	Exact match “The Rothenberg Law Firm LLP, founded by Allen L.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
11	Langsam Stevens Silver & Hollaender LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	21 contacts →
	Exact match “Langsam Stevens Silver & Hollaender LLP is a boutique law firm that has developed a client-driven and cost-effective philosophy to provide exceptional advice and legal counsel…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
12	Kelley Jasons Mcgowan Spinelli Hanna & Reber LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	51-200	18 contacts →
	Exact match “Kelley Jasons is a committed team of experienced lawyers, with more than twenty-five years of experience defending clients in courtrooms around the country.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
13	Salmon, Ricchezza, Singer And Turchi LLP	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	18 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
14	Repsg, INC	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	13 contacts →
	Exact match “REPSG is a full-service environmental consulting and contracting firm dedicated to understanding each customer’s endpoint, plotting the best route forward, and achieving that goal.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
15	Freiwald Law, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	13 contacts →
	Exact match “Look out, Goliath!” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
16	LAW Offices Of Thomas J. Wagner, LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	10 contacts →
	Exact match “The Law Offices of Thomas J.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
17	Steve Harvey LAW LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	1-10	9 contacts →
	Exact match “Steve Harvey Law LLC, based in Philadelphia, Pennsylvania, is a team of lawyers that advises and represents clients in litigation and at trial.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
18	Deasey, Mahoney & Valentini, LTD	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	5 contacts →
	Exact match “Defense litigation law firm for automotive liability, construction defects, construction site injury, governmental liability, premises liability, products liability.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
19	Bazelon Less & Feldman, P.C	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	3 contacts →
	Exact match “Founded in 1983, Bazelon Less & Feldman was born of a belief that most commercial litigation matters could best be handled by a small group of highly talented and experienced…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
20	Black & Gerngross, PC	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	11-50	3 contacts →
	Exact match “BLACK & GERNGROSS, PC is a company based out of 1617 JOHN F.” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
21	Rohn Kurland, PC	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	1-10	2 contacts →
	Exact match “Rohn Kurland's mission is to apply the best proactive measures to prevent legal problems in large public and private institutions, mitigate risk and defend against government…” Recorded in the RevenueBase company graph · Sep 28, 2026 · View company records in RevenueBase
22	Mt. Airy Environmental Services, LLC	Exact match	Philadelphia, PA, United StatesHQ recorded Sep 28, 2026	1-10	1 contacts →
	Exact match “Mt.” Recorded in the RevenueBase company graph · Sep 28, 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 liability law 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 22 of 31 environmental liability law firms based in Philadelphia, United States

See the full list, filter by size, metro and specialty, and access 1,872 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Environmental liability law firms based in Philadelphia, United States at a glance

As of Sep 28, 2026

44.8%Verified-email coverage

134.9Average contacts per company

11-50Median size (employees)

Sep 28, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Philadelphia, so it is reported there. Company counts and contact totals on this page are exact for Philadelphia, over 31 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 Philadelphia, United States whose business descriptions match “environmental liability law 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 1,872 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 28, 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 liability law 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 liability law firms”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many environmental liability law firms are there based in Philadelphia, United States?

RevenueBase identified 31 company matches for environmental liability law firms associated with Philadelphia, 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?

Ballard Spahr LLP 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 liability law firms?

New York leads the United States with 84 company records, followed by Houston (77) and Washington (65). Philadelphia has 31.

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 1,872 professional contacts with verified work emails tracked across these 31 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 28, 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.