Company lists · Data refreshed September 2026

Top 25 Environmental consulting for hydro projects based in Houston, United States

Name: Environmental consulting for hydro projects based in Houston, United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 61 companies tracked

RevenueBase identified 61 environmental consulting for hydro projects headquartered in Houston, United States as of September 2026 and tracks 1,302 professional contacts across them, including 467 with verified work emails. Houston is the largest hub.

This list covers environmental consulting for hydro projects headquartered in Houston, 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 19, 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 19, 2026 86% judged on-target in blind review

61Companies

1,302Contacts tracked

467Verified emails

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The 25 largest environmental consulting for hydro projects based in Houston, United States

Ranked by team size

Top 25 of 61 environmental consulting for hydro projects based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to environmental consulting for hydro projects: 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	GSI Environmental INC	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	259 contacts →
	Strong evidence “GSI Environmental, Inc.(GSI), is an environmental engineering and science consulting firm committed to measuring, analyzing, and solving complex environmental problems around the…” Source: RevenueBase Database · checked Sep 19, 2026
2	Edge Engineering And Science, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	116 contacts →
	Indirect evidence “Edge Engineering & Science, LLC (EDGE) is a privately owned professional services firm headquartered in Houston, Texas.” Source: RevenueBase Database · checked Sep 19, 2026
3	Perennial Environmental Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	102 contacts →
	Partial evidence “Perennial Environmental Services, LLC, has been providing technical environmental solutions and management with fresh perspectives and unparalleled efficiency since 2003.” Source: RevenueBase Database · checked Sep 19, 2026
4	Civitas Engineering Group, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	65 contacts →
	Indirect evidence “Civitas Engineering Group Inc.” Source: RevenueBase Database · checked Sep 19, 2026
5	Aarc Environmental	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	63 contacts →
	Partial evidence “As a leader in the environmental compliance services industry, AARC does more than just meeting the needs of clients today.” Source: RevenueBase Database · checked Sep 19, 2026
6	Sage ATC Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	201-500	63 contacts →
	Strong evidence “Sage ATC Environmental Consulting is now Atlas.” Source: RevenueBase Database · checked Sep 19, 2026
7	Spirit Environmental Montrose Environmental Group	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	54 contacts →
	Indirect evidence “In July of 2024, Spirit was acquired by Onterris.” Source: RevenueBase Database · checked Sep 19, 2026
8	Phase Engineering, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	34 contacts →
	Strong evidence “Phase Engineering, LLC, was founded in 1993 and is a leading engineering and environmental consulting firm, serving clients nationwide to deliver trusted environmental solutions.” Source: RevenueBase Database · checked Sep 19, 2026
9	Hollaway Environmental Communications Services, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	33 contacts →
	Partial evidence “Hollaway Environmental + Communication Services, an SBE/DBE/WBE/HUB firm, bridges two worlds that are uniquely connected: Environmental Services and Communications Services.” Source: RevenueBase Database · checked Sep 19, 2026
10	Ch-Iv International	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	32 contacts →
	Partial evidence “As an extension of the Owner's team, we support Project Development and Asset Life Extensions through decades of experience and deep industry expertise.” Source: RevenueBase Database · checked Sep 19, 2026
11	UES Professional Solutions 64, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	31 contacts →
	Strong evidence “Environmental Consulting and Engineering InControl Technologies was established in 1997 to provide high-end quality environmental consulting services to owners of commercial and…” Source: RevenueBase Database · checked Sep 19, 2026
12	TGE Resources, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	21 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
13	SIA Solutions, LLC	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	19 contacts →
	Strong evidence “SIA Solutions LLC (SIA) has merged with Salas O'Brien and continues to focus on program and project-specific engineering and technical solutions in Environmental Consulting…” Source: RevenueBase Database · checked Sep 19, 2026
14	Environmental Operational Solutions Eosolutions	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	19 contacts →
	Indirect evidence “At EOSolutions, we know you want your operations to stay in compliance.” Source: RevenueBase Database · checked Sep 19, 2026
15	ERC Environmental & Construction Services	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	18 contacts →
	Strong evidence “ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: RevenueBase Database · checked Sep 19, 2026
16	Jones Engineering Solutions	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	14 contacts →
	Partial evidence “Jones Engineering Solutions is a full service consulting civil engineering firm.” Source: RevenueBase Database · checked Sep 19, 2026
17	SKA Consulting, L.P	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	13 contacts →
	Strong evidence “SKA Consulting is a professional environmental engineering and consulting firm providing timely, innovative solutions to today’s environmental challenges.” Source: RevenueBase Database · checked Sep 19, 2026
18	Bocci Engineering	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	13 contacts →
	Partial evidence “Bocci is an energy and environmental engineering consultancy based in Houston, Texas providing high quality, innovative and cost-effective solutions that significantly reduce or…” Source: RevenueBase Database · checked Sep 19, 2026
19	Krest Engineers, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	9 contacts →
	Partial evidence “Krest Engineers, LLC, a multi-discipline engineering consulting firm established in 2023, is dedicated to serving both public and private sector clients in Texas through offering…” Source: RevenueBase Database · checked Sep 19, 2026
20	WGA Consulting Engineers	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	51-200	8 contacts →
	Partial evidence “WGA is a Texas-based professional consulting firm that specializes in civil engineering, land development, municipal engineering and construction phase services.” Source: RevenueBase Database · checked Sep 19, 2026
21	Cypress Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	8 contacts →
	Strong evidence “Cypress Environmental Consulting LLC (CEC) provides a broad range of environmental services including planning, site assessment, and permitting with a focus on regulatory…” Source: RevenueBase Database · checked Sep 19, 2026
22	Corrigan Consulting INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	7 contacts →
	Indirect evidence “Since 1986, CCI has been providing specialized services in hazardous waste compliance, permitting, site investigations, and closures; underground storage tank removals and…” Source: RevenueBase Database · checked Sep 19, 2026
23	Disorbo Consulting, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	5 contacts →
	Partial evidence “DiSorbo Consulting is now a part of Trinity Consultants.” Source: RevenueBase Database · checked Sep 19, 2026
24	Trilogy Engineering Services	Indirect evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	1-10	5 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 19, 2026
25	Reces Environmental Consulting	Strong evidence	Houston, TX, United StatesHQ checked Sep 19, 2026	11-50	4 contacts →
	Strong evidence “RECES, LLC is an environmental consulting firm specializing in air, water, and wastewater permitting and regulatory compliance for clients throughout the United States.” Source: RevenueBase Database · checked Sep 19, 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 for hydro projects. 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 for hydro projects.
Partial evidence: Its own public description names part of environmental consulting for hydro projects, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name environmental consulting for hydro projects. 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 61 environmental consulting for hydro projects based in Houston, United States

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Environmental consulting for hydro projects based in Houston, United States at a glance

As of Sep 19, 2026

35.9%Verified-email coverage

21.3Average contacts per company

11-50Median size (employees)

100.0%Largest-city concentration · Houston

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Email recency for this list is measured across the whole United States list rather than for Houston, so it is reported there. Company counts and contact totals on this page are exact for Houston, over 61 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 for hydro projects, 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 Houston, United States whose own description of what they do matches “environmental consulting for hydro projects”. 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 for hydro projects), 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 for hydro projects, and records with no verified work email. Companies headquartered outside Houston 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, 467 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 19, 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 for hydro projects by metro in the United States

Environmental consulting for hydro projects in Houston61
Environmental consulting for hydro projects in Denver30
Environmental consulting for hydro projects in Seattle30
Environmental consulting for hydro projects in Austin26

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 for hydro projects, 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 for hydro projects are there based in Houston, United States?

RevenueBase identified 61 environmental consulting for hydro projects headquartered in Houston, 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?

GSI Environmental INC, headquartered in Houston, tops this list with the largest team on record.

Which city has the most environmental consulting for hydro projects?

Houston leads with 61 headquartered companies, followed by Denver (30) and Seattle (30).

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 467 verified decision-maker contacts tracked across these 61 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 19, 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.