Company lists · Data refreshed September 2026

Top 25 Hydrogeological consulting firms based in Houston, United States

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

Compiled by the RevenueBase Data Team Data refreshed Sep 12, 2026 75 companies tracked

RevenueBase identified 75 hydrogeological consulting firms headquartered in Houston, United States as of September 2026 and tracks 1,160 professional contacts across them, including 355 with verified work emails and 506 with mobile numbers. Across the United States, Houston is the largest hub for this category.

This list covers hydrogeological consulting firms 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 12, 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 12, 2026 86% judged on-target in blind review

75Companies

1,160Contacts tracked

355Verified emails

506Mobile numbers

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The 25 largest hydrogeological consulting firms based in Houston, United States

Ranked by team size

Top 25 of 75 hydrogeological consulting firms based in Houston, United States, ranked by team size, largest first. Data refreshed Sep 12, 2026. RevenueBase Smart Search rates how each company's information relates to hydrogeological 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	GSI Environmental INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	201-500	259 contacts →
	Partial 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 12, 2026
2	Edge Engineering And Science, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 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 12, 2026
3	Civitas Engineering Group, INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	65 contacts →
	Indirect evidence “Civitas Engineering Group Inc.” Source: RevenueBase Database · checked Sep 12, 2026
4	Riner Engineering, Inc., A UES Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	47 contacts →
	Indirect evidence “Riner Engineering became part of the UES family of companies in June 2023, combining our local expertise with UES’s nationwide presence and resources.” Source: RevenueBase Database · checked Sep 12, 2026
5	Phase Engineering, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	34 contacts →
	Partial 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 12, 2026
6	Aurora Technical Services, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	31 contacts →
	Partial evidence “Aurora Technical Services, LLC is a Houston-based civil engineering consulting firm that provides engineering expertise focused on water and wastewater pipelines.” Source: RevenueBase Database · checked Sep 12, 2026
7	TEG	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	26 contacts →
	Indirect evidence “Professional Engineering support for geotechnical, construction, oil and gas, horizontal directional drillings, materials testing, and forensic studies for residential and…” Source: RevenueBase Database · checked Sep 12, 2026
8	The Murillo Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	26 contacts →
	Indirect evidence “Established in 1967, The Murillo Company (TMC) specializes in Geotechnical Engineering, Construction Materials Testing and Inspection, and a wide range of Environmental Services.” Source: RevenueBase Database · checked Sep 12, 2026
9	Geostock Sandia	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	25 contacts →
	Partial evidence “WE MAKE THE EARTH THE BEST PLACE FOR STORING ALL ENERGIES UNDERGROUND STORAGE AND SUBSURFACE INJECTION Geostock Sandia is an engineering & geological consulting firm specializing…” Source: RevenueBase Database · checked Sep 12, 2026
10	Geovision	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	24 contacts →
	Indirect evidence “When a well kicks off horizontally, our expertise runs deep.” Source: RevenueBase Database · checked Sep 12, 2026
11	W.D. VON Gonten Engineering LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	23 contacts →
	Indirect evidence “A premier Petroleum Engineering firm merging the Reservoir Engineering expertise of W.” Source: RevenueBase Database · checked Sep 12, 2026
12	Kenall	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	21 contacts →
	Indirect evidence “Kenall is a SB and W/M/DBE company committed to providing civil engineering, geotechnical engineering, transportation engineering, water resources planning, environmental…” Source: RevenueBase Database · checked Sep 12, 2026
13	SIA Solutions, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	19 contacts →
	Partial 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 12, 2026
14	ERC Environmental & Construction Services	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	18 contacts →
	Partial evidence “ERC is a Professional Services Firm in Environmental Consulting and Construction.” Source: RevenueBase Database · checked Sep 12, 2026
15	Bazan Consulting, INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	18 contacts →
	Partial evidence “Lucas W Bazan founded Bazan Consulting, Inc.(BCI) in April 2008.” Source: RevenueBase Database · checked Sep 12, 2026
16	HPO Global Resource Venture INC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	17 contacts →
	Partial evidence “HPO GLOBAL RESOURCES VENTURES (INC.)(HPO Global) is the consulting arm of a group of Companies established in 2001 by a group of professionals with over 250 cumulative years of…” Source: RevenueBase Database · checked Sep 12, 2026
17	GTS Geotech	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	51-200	17 contacts →
	Indirect evidence “Established since 1995, GTS Geotech (GTS) provides independent, cost effective, geotechnical support solutions to the international oil and gas industry.” Source: RevenueBase Database · checked Sep 12, 2026
18	Jones Engineering Solutions	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	14 contacts →
	Partial evidence “Jones Engineering Solutions is a full service consulting civil engineering firm.” Source: RevenueBase Database · checked Sep 12, 2026
19	Paradigm Consultants, Inc., A CMT Company	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	14 contacts →
	Indirect evidence “Paradigm Consultants, Inc.” Source: RevenueBase Database · checked Sep 12, 2026
20	Cascade Civil Services, LLC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	13 contacts →
	Indirect evidence “Cascade Civil Services (Cascade) is a full-service Houston-based civil engineering firm that specializes in providing drainage analysis and design services to our clients.” Source: RevenueBase Database · checked Sep 12, 2026
21	Pangea Geoscience	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	11-50	11 contacts →
	Indirect evidence “Pangea Geoscience LLC offers a dedicated team with collectively more than 80 years of experience in integration of geology and engineering.” Source: RevenueBase Database · checked Sep 12, 2026
22	Krest Engineers, LLC	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 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 12, 2026
23	Corrigan Consulting INC	Indirect evidence	Houston, TX, United StatesHQ checked Sep 12, 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 12, 2026
24	TGI Engineering & Consulting	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	7 contacts →
	Partial evidence “TGI Engineering & Consulting is a specialized consulting and engineering services firm that works with private and public sector customers to deliver cost-effective and…” Source: RevenueBase Database · checked Sep 12, 2026
25	Radius Energy Solutions	Partial evidence	Houston, TX, United StatesHQ checked Sep 12, 2026	1-10	5 contacts →
	Partial evidence “Full-service engineering, consulting, project management firm primarily focused on horizontal shale operations and development planning domestically and abroad.” Source: RevenueBase Database · checked Sep 12, 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: hydrogeological 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 hydrogeological consulting firms.
Partial evidence: Its own public description names part of hydrogeological consulting firms, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name hydrogeological 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 75 hydrogeological consulting firms based in Houston, United States

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Hydrogeological consulting firms based in Houston, United States at a glance

As of Sep 12, 2026

30.6%Verified-email coverage

43.6%Mobile-number coverage

15.5Average contacts per company

1-10Median size (employees)

Sep 12, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

Freshness & accuracy

How recently the business emails were verified and the company information checked

Email last verified

Median 14.0d

3050–30

4331–60

461–90

090–180

3180+

Company record updated

Median 54.0d

00–30

60331–60

41061–90

9790–180

50180+

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 hydrogeological 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 Houston, United States whose own description of what they do matches “hydrogeological 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 hydrogeological 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 hydrogeological consulting firms, 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, 355 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 12, 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.

Hydrogeological consulting firms by metro in the United States

Hydrogeological consulting firms in Denver28

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 hydrogeological 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 hydrogeological consulting firms are there based in Houston, United States?

RevenueBase identified 75 hydrogeological consulting firms 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 in the United States has the most hydrogeological consulting firms?

Houston leads the United States with 69 headquartered companies, followed by Denver (28) and Portland (25).

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 355 verified decision-maker contacts tracked across these 75 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 12, 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.