Company lists · Data refreshed November 2026

Top 25 Hydrogeological survey services based in the United States

Name: Hydrogeological survey services based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Nov 6, 2026 489 companies tracked

RevenueBase identified 489 company matches for hydrogeological survey services associated with the United States as of November 2026 and tracks 6,880 professional contacts across them, including 2,652 with verified work emails. Houston is the largest hub.

This list covers company matches for hydrogeological survey services associated with the 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 November 6, 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 Nov 6, 2026 How this list was built

489Companies

6,880Contacts tracked

2,652Verified emails

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The 25 largest hydrogeological survey services based in the United States

Ranked by team size

Top 25 of 489 company matches for hydrogeological survey services based in the United States, ordered by professional contacts tracked in RevenueBase, largest first. Recorded Nov 6, 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	Intera Incorporated	Exact match	Austin, FL, United StatesHQ recorded Nov 6, 2026	201-500	286 contacts →
	Exact match “Established in 1974, INTERA is a geosciences and engineering consulting firm focused on providing water resources and supply, environmental, mining, radioactive waste isolation…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
2	EKI Environment & Water, INC	Exact match	Corte Madera, CA, United StatesHQ recorded Nov 6, 2026	51-200	187 contacts →
	Exact match “EKI Environment & Water, Inc.(EKI) is an employee-owned company that has provided comprehensive water resources and engineering services to public and private sector clients for…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
3	Kumar And Associates, INC	Exact match	Denver, CO, United StatesHQ recorded Nov 6, 2026	51-200	153 contacts →
	Exact match “Kumar & Associates provides geotechnical engineering, engineering geology, environmental sciences, construction observation and materials testing services for projects in the…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
4	Geo-Logic Associates, INC	Exact match	Ontario, CA, United StatesHQ recorded Nov 6, 2026	201-500	148 contacts →
	Exact match “Geo-Logic Associates, Inc.(GLA) is an employee-owned, multidisciplinary consulting firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
5	Converse Consultants	Exact match	Monrovia, CA, United StatesHQ recorded Nov 6, 2026	51-200	139 contacts →
	Exact match “Converse was established in 1946 by Professor Frederick J.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
6	Montgomery & Associates	Exact match	Tucson, CA, United StatesHQ recorded Nov 6, 2026	51-200	133 contacts →
	Exact match “M&A is a water resource consulting firm that partners with clients to address their evolving water resource challenges.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
7	Hydro Resources Holdings, INC	Exact match	Sugar Land, TX, United StatesHQ recorded Nov 6, 2026	201-500	94 contacts →
	Exact match “Hydro Resources specializes in providing the complete solution in the development and maintenance of your groundwater project.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
8	Daniel B. Stephens & Associates, INC	Exact match	Albuquerque, TX, United StatesHQ recorded Nov 6, 2026	51-200	88 contacts →
	Exact match “Daniel B.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
9	West Consultants, INC	Exact match	San Diego, AZ, United StatesHQ recorded Nov 6, 2026	51-200	86 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
10	Larry Walker Associates	Exact match	Davis, CA, United StatesHQ recorded Nov 6, 2026	51-200	81 contacts →
	Exact match “Larry Walker Associates (LWA) is a privately owned firm headquartered in Davis, California, with offices in Berkeley, Yreka, Santa Monica, Ventura, San Diego, and Seattle, WA.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
11	A. G. Wassenaar, INC	Exact match	Englewood, CO, United StatesHQ recorded Nov 6, 2026	51-200	77 contacts →
	Exact match “Founded in 1972, AGW is a multi-disciplined consulting engineering firm specializing in the geosciences and environmental services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
12	Princeton Hydro	Exact match	Trenton, NJ, United StatesHQ recorded Nov 6, 2026	51-200	73 contacts →
	Exact match “Experience, Expertise and Excellence in Water Resources, Ecology, and Geotechnical Engineering.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
13	Collier Consulting & Collier Geophysics	Exact match	Stephenville, MA, United StatesHQ recorded Nov 6, 2026	51-200	73 contacts →
	Exact match “Geoscience • Engineering • Geophysics Collier Consulting, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
14	GSI Water Solutions, INC	Exact match	Portland, OR, United StatesHQ recorded Nov 6, 2026	51-200	70 contacts →
	Exact match “GSI Water Solutions, Inc, is a specialized groundwater, environmental, and water resources consulting firm.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
15	Salem Engineering Group, INC	Exact match	Fresno, CO, United StatesHQ recorded Nov 6, 2026	51-200	65 contacts →
	Exact match “SALEM Engineering Group, Inc, is a multi-disciplined national engineering and environmental consulting firm offering services in the following disciplines: • Geotechnical…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
16	LRE Water A Spheros Environmental Company	Exact match	Denver, CO, United StatesHQ recorded Nov 6, 2026	51-200	64 contacts →
	Exact match “LRE Water is now Spheros Environmental.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
17	Weisinger Incorporated	Exact match	Willis, TX, United StatesHQ recorded Nov 6, 2026	201-500	64 contacts →
	Exact match “Authentic relationships are standard practice at Weisinger Incorporated.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
18	Mcphail Associates, LLC	Exact match	Burlington, MA, United StatesHQ recorded Nov 6, 2026	51-200	63 contacts →
	Exact match “Since 1976 McPhail Associates has been providing geotechnical engineering services to architects, owners, contractors, institutions, and developers.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
19	Blaine Tech Services	Exact match	San Jose, WA, United StatesHQ recorded Nov 6, 2026	51-200	62 contacts →
	Exact match “Blaine Tech Services performs environmental sampling and related field services.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
20	Call & Nicholas	Exact match	Tucson, AZ, United StatesHQ recorded Nov 6, 2026	51-200	60 contacts →
	Exact match “CALL & NICHOLAS (CNI) is an international mining consulting firm that specializes in geological engineering, geotechnical engineering, and hydrogeology.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
21	Gomez And Sullivan Engineers, D.P.C	Exact match	Utica, NY, United StatesHQ recorded Nov 6, 2026	11-50	58 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
22	Moody And Associates, INC	Exact match	Washington, PA, United StatesHQ recorded Nov 6, 2026	51-200	57 contacts →
	Exact match Recorded description not available. Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
23	Associated Earth Sciences, Inc. Aesi	Exact match	Kirkland, WA, United StatesHQ recorded Nov 6, 2026	51-200	51 contacts →
	Exact match “In the early 1980s, geologist Louis Lepp had a vision to start a local geologic/geotechnical engineering consulting company by combining and coordinating several of the…” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
24	Peerless Midwest, INC	Exact match	Mishawaka, MI, United StatesHQ recorded Nov 6, 2026	51-200	48 contacts →
	Exact match “Since 1973, Peerless-Midwest, Inc.” Recorded in the RevenueBase company graph · Nov 6, 2026 · View company records in RevenueBase
25	Earth Solutions Nw, LLC	Exact match	Redmond, WA, United StatesHQ recorded Nov 6, 2026	51-200	46 contacts →
	Exact match “At Earth Solutions NW, we lead geotechnical engineering initiatives on commercial and residential projects with hard-earned expertise and an unwavering commitment to client…” Recorded in the RevenueBase company graph · Nov 6, 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 “hydrogeological survey services”. 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 25 of 489 hydrogeological survey services based in the United States

See the full list, filter by size, metro and specialty, and access 2,652 tracked professional contacts with verified work emails. Direct dials are available where recorded.

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Hydrogeological survey services based in the United States at a glance

As of Nov 6, 2026

38.5%Verified-email coverage

14.1Average contacts per company

1-10Median size (employees)

2.0%Largest-city concentration · Houston

Nov 6, 2026Page data refreshed

Companies by employee count

1-10

265

11-50

162

51-200

201-500

1,001-5,000

5,001-10,000

Email recency for this list is measured worldwide rather than for United States, so it is reported there. Company counts and contact totals on this page are exact for United States, over 489 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 the United States whose business descriptions match “hydrogeological survey services” 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 2,652 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 November 6, 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.

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 “hydrogeological survey services”; each Exact match badge shows search membership, not an individual similarity or quality score.

How many hydrogeological survey services are there based in the United States?

RevenueBase identified 489 company matches for hydrogeological survey services associated with the United States as of November 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?

Intera Incorporated tops the displayed preview by professional contacts tracked in RevenueBase. Recorded headquarters appear in the company rows.

Which city has the most hydrogeological survey services?

Houston leads with 10 company records, followed by Denver (9) and Austin (6).

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 2,652 professional contacts with verified work emails tracked across these 489 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 November 6, 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.