Company lists · Data refreshed September 2026

Top 25 Environmental consulting firms based in Indianapolis, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 14, 2026 42 companies tracked

RevenueBase identified 42 environmental consulting firms headquartered in Indianapolis, United States as of September 2026 and tracks 2,223 professional contacts across them, including 760 with verified work emails. Houston is the largest hub.

This list covers environmental consulting firms headquartered in Indianapolis, 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 14, 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 14, 2026 86% judged on-target in blind review

42Companies

2,223Contacts tracked

760Verified emails

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The 25 largest environmental consulting firms based in Indianapolis, United States

Ranked by team size

Top 25 of 42 environmental consulting firms based in Indianapolis, United States, ranked by team size, largest first. Data refreshed Sep 14, 2026. RevenueBase Smart Search rates how each company's information relates to environmental consulting firms: 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	August Mack Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	210 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
2	Patriot Engineering And Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	183 contacts →
	Indirect evidence “Since its beginning in 1995, Patriot has built its reputation on serving the needs of the growing development and redevelopment community.” Source: RevenueBase Database · checked Sep 14, 2026
3	Keramida INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	152 contacts →
	Partial 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 14, 2026
4	Wessler Engineering	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	109 contacts →
	Partial evidence “Wessler Engineering is a civil and environmental engineering firm, specializing in wastewater, drinking water, and stormwater projects, providing services ranging from master…” Source: RevenueBase Database · checked Sep 14, 2026
5	United Consulting, Indianapolis, In	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	96 contacts →
	Partial evidence “United Consulting provides quality service their clients can depend on.” Source: RevenueBase Database · checked Sep 14, 2026
6	Applied Engineering Services	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	72 contacts →
	Partial evidence “Applied Engineering Services is an Indianapolis-based consulting engineering firm providing mechanical, electrical, and instrumentation engineering services.” Source: RevenueBase Database · checked Sep 14, 2026
7	R.E. Dimond And Associates	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	68 contacts →
	Indirect evidence “R.E.” Source: RevenueBase Database · checked Sep 14, 2026
8	Noble Consulting Services, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	51 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 14, 2026
9	Metric Environmental, LLC	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	47 contacts →
	Strong evidence “Metric Environmental, LLC is a DBE/MBE environmental consulting firm headquartered in Indianapolis, Indiana with additional offices in Gary, Indiana, Cincinnati, Ohio and…” Source: RevenueBase Database · checked Sep 14, 2026
10	Summit Environmental Services, LLC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	47 contacts →
	Partial evidence “Summit Environmental Services LLC, based out of Indianapolis, IN, is a nationwide environmental contracting and specialty civil construction services company.” Source: RevenueBase Database · checked Sep 14, 2026
11	Sesco Group	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	40 contacts →
	Strong evidence “Founded in 1996 as an Environmental Investigation and Remediation company, SESCO Group (SESCO) has established a reputation for excellence in providing environmental consulting…” Source: RevenueBase Database · checked Sep 14, 2026
12	Enviroforensics	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	30 contacts →
	Strong evidence “We’re a national full-service environmental consulting firm solving complex environmental issues.” Source: RevenueBase Database · checked Sep 14, 2026
13	Circle Design Group	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	25 contacts →
	Partial evidence “CIRCLE DESIGN GROUP is a successful MEP/civil consulting engineering firm serving our clients since 1982.” Source: RevenueBase Database · checked Sep 14, 2026
14	Astbury Water Technology, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	20 contacts →
	Indirect evidence “Astbury’s unique approach provides its clients with the highest level of expertise available as efficiently, economically, and reliably as possible.” Source: RevenueBase Database · checked Sep 14, 2026
15	Mundell & Associates, INC	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	19 contacts →
	Strong evidence “Founded in 1995, Mundell & Associates, Inc.(Mundell) is an earth and environmental services consulting company providing quantitative site characterization and remedial services…” Source: RevenueBase Database · checked Sep 14, 2026
16	IWM Consulting Group	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	18 contacts →
	Strong evidence “IWM Consulting is an environmental consulting firm aimed at helping our clients to maximize their assets and mitigate the risks associated with site utilization and environmental…” Source: RevenueBase Database · checked Sep 14, 2026
17	Cmid, INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	18 contacts →
	Partial evidence “Consulting Management Inspection Design, Inc.(CMID) is a minority owned full service architectural & engineering consulting firm.” Source: RevenueBase Database · checked Sep 14, 2026
18	Loftus Engineering, INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Partial evidence “Loftus Engineering is an Indianapolis-based WBE, full service mechanical and electrical consulting engineering firm, specializing in unique, complex and sustainable building…” Source: RevenueBase Database · checked Sep 14, 2026
19	Environmental Field Services, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	14 contacts →
	Indirect evidence “In 1994, our founders wanted to change the way field services for consultants and engineers was performed.” Source: RevenueBase Database · checked Sep 14, 2026
20	Star Environmental, INC	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	51-200	14 contacts →
	Partial evidence “Star provides compliant, efficient management and removal of our customer’s environmental liabilities supported by a $5M pollution liability insurance policy.” Source: RevenueBase Database · checked Sep 14, 2026
21	Workplace Safety & Health Co., INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	11 contacts →
	Indirect evidence “Workplace Safety & Health Co.” Source: RevenueBase Database · checked Sep 14, 2026
22	Landworx Engineering	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	1-10	9 contacts →
	Partial evidence “Consulting Civil Engineering company specializing in private and public redevelopment projects.” Source: RevenueBase Database · checked Sep 14, 2026
23	Alliance Environmental Group, INC	Strong evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	11-50	8 contacts →
	Strong evidence “Alliance Environmental Group, Inc.(Alliance) is a woman-owned environmental consulting company staffed with professionals utilizing a multi-disciplined approach in providing…” Source: RevenueBase Database · checked Sep 14, 2026
24	Amalgaway	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	1-10	2 contacts →
	Partial evidence “Amalgaway is your environmental solutions company.” Source: RevenueBase Database · checked Sep 14, 2026
25	Certified Consultants LTD	Partial evidence	Indianapolis, IN, United StatesHQ checked Sep 14, 2026	1-10	1 contacts →
	Partial evidence “Certified Consultants is an internationally focused horticultural sustainability and water management-consulting firm.” Source: RevenueBase Database · checked Sep 14, 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 consulting firms. 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 consulting firms.
Partial evidence: Its own public description names part of environmental consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental consulting firms. 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 42 environmental consulting firms based in Indianapolis, United States

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Environmental consulting firms based in Indianapolis, United States at a glance

As of Sep 14, 2026

34.2%Verified-email coverage

52.9Average contacts per company

11-50Median size (employees)

342.9%Largest-city concentration · Houston

Sep 14, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

1,001-5,000

Email recency for this list is measured across the whole United States list rather than for Indianapolis, so it is reported there. Company counts and contact totals on this page are exact for Indianapolis, over 42 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 consulting firms, 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 Indianapolis, United States whose own description of what they do matches “environmental consulting firms”. 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 consulting firms), 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 consulting firms, and records with no verified work email. Companies headquartered outside Indianapolis 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, 760 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 14, 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.

Environmental consulting firms by metro in the United States

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 consulting firms, 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 consulting firms are there based in Indianapolis, United States?

RevenueBase identified 42 environmental consulting firms headquartered in Indianapolis, 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?

August Mack Environmental, INC, headquartered in Indianapolis, tops this list with the largest team on record.

Which city has the most environmental consulting firms?

Houston leads with 144 headquartered companies, followed by New York (113) and Seattle (84).

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 760 verified decision-maker contacts tracked across these 42 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 14, 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.