Company lists · Data refreshed September 2026

Top 25 Groundwater consulting companies based in the United States

Name: Groundwater consulting companies based in the United States
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 1,041 companies tracked

RevenueBase identified 1,041 groundwater consulting companies headquartered in the United States as of September 2026 and tracks 32,687 professional contacts across them, including 13,598 with verified work emails. Houston is the largest hub.

This list covers groundwater consulting companies headquartered in the 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 20, 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 20, 2026 86% judged on-target in blind review

1,041Companies

32,687Contacts tracked

13,598Verified emails

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The 25 largest groundwater consulting companies based in the United States

Ranked by team size

Top 25 of 1,041 groundwater consulting companies based in the United States, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to groundwater consulting companies: 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	Tetra Tech	Indirect evidence	Pasadena, CA, United StatesHQ checked Sep 20, 2026	10001+	12,999 contacts →
	Indirect evidence “Tetra Tech is the leader in water, environment and sustainable infrastructure, providing high-end technical and engineering services for projects worldwide.” Source: RevenueBase Database · checked Sep 20, 2026
2	Brown And Caldwell	Indirect evidence	Walnut Creek, CA, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,473 contacts →
	Indirect evidence “Headquartered in Walnut Creek, Calif, Brown and Caldwell is an employee-owned firm with 2,100+ professionals serving clients locally and globally from 52 locations.” Source: RevenueBase Database · checked Sep 20, 2026
3	Hazen And Sawyer	Indirect evidence	New York, NY, United StatesHQ checked Sep 20, 2026	1,001-5,000	2,100 contacts →
	Indirect evidence “As Hazen marks 75 years, we celebrate a legacy of absolute commitment to our clients while delivering the best technical work available anywhere.” Source: RevenueBase Database · checked Sep 20, 2026
4	Trihydro Corporation	Partial evidence	Laramie, WY, United StatesHQ checked Sep 20, 2026	501-1,000	577 contacts →
	Partial evidence “Headquartered in Laramie, Wyoming, Trihydro provides environmental consulting, engineering and surveying, air quality and process management, information technology, and water and…” Source: RevenueBase Database · checked Sep 20, 2026
5	Anchor QEA	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	501-1,000	479 contacts →
	Partial evidence “Headquartered in Seattle, Washington, Anchor QEA is a nationally recognized environmental science and engineering consulting firm specializing in aquatic, shoreline, and water…” Source: RevenueBase Database · checked Sep 20, 2026
6	CME Associates	Indirect evidence	Parlin, NJ, United StatesHQ checked Sep 20, 2026	201-500	336 contacts →
	Indirect evidence “CME Associates, with eight (8) office locations throughout New Jersey, provides a complete range of Environmental, Geotechnical, Engineering, Surveying and Planning services.” Source: RevenueBase Database · checked Sep 20, 2026
7	Froehling & Robertson, INC	Indirect evidence	Richmond, VA, United StatesHQ checked Sep 20, 2026	201-500	312 contacts →
	Indirect evidence “Established in 1881, Froehling & Robertson, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
8	West Yost	Partial evidence	Davis, CA, United StatesHQ checked Sep 20, 2026	201-500	279 contacts →
	Partial evidence “West Yost is a water-focused consulting engineering firm ranked by Fortune Magazine as one of the “Best Small and Medium Workplaces in Consulting and Professional Services” 2023 -…” Source: RevenueBase Database · checked Sep 20, 2026
9	Intera Incorporated	Partial evidence	Austin, TX, United StatesHQ checked Sep 20, 2026	201-500	259 contacts →
	Partial evidence “Established in 1974, INTERA is a geosciences and engineering consulting firm focused on providing water resources and supply, environmental, mining, radioactive waste isolation…” Source: RevenueBase Database · checked Sep 20, 2026
10	Mersino Water Solutions	Indirect evidence	Auburn Hills, MI, United StatesHQ checked Sep 20, 2026	501-1,000	248 contacts →
	Indirect evidence “For 36 years, Mersino has been trusted with the most complex water management challenges in the country.” Source: RevenueBase Database · checked Sep 20, 2026
11	Cascade Environmental, LLC	Indirect evidence	Bothell, WA, United StatesHQ checked Sep 20, 2026	1,001-5,000	248 contacts →
	Indirect evidence “CASCADE is the leading provider of environmental and geotechnical drilling, site investigation and environmental remediation.” Source: RevenueBase Database · checked Sep 20, 2026
12	Patriot Engineering And Environmental, INC	Indirect evidence	Indianapolis, IN, United StatesHQ checked Sep 20, 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 20, 2026
13	Herrera Environmental Consultants	Partial evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	176 contacts →
	Partial evidence “Herrera Environmental Consultants is a leading engineering and scientific consulting firm focused on restoration, water, and sustainable development.” Source: RevenueBase Database · checked Sep 20, 2026
14	Aqualis	Indirect evidence	Morrisville, NC, United StatesHQ checked Sep 20, 2026	501-1,000	136 contacts →
	Indirect evidence “AQUALIS is the national leader in water management, compliance and engineering, helping businesses meet complex water regulations while protecting long-term infrastructure.” Source: RevenueBase Database · checked Sep 20, 2026
15	Converse Consultants	Indirect evidence	Monrovia, CA, United StatesHQ checked Sep 20, 2026	51-200	132 contacts →
	Indirect evidence “Converse was established in 1946 by Professor Frederick J.” Source: RevenueBase Database · checked Sep 20, 2026
16	Ensero Solutions	Partial evidence	Fort Collins, CO, United StatesHQ checked Sep 20, 2026	51-200	129 contacts →
	Partial evidence “Ensero Solutions is an environmental consulting and remediation business with specific expertise in environmental assessments and permitting solutions, mine water management…” Source: RevenueBase Database · checked Sep 20, 2026
17	CMS Environmental Solutions	Indirect evidence	Greenwood Village, CO, United StatesHQ checked Sep 20, 2026	51-200	126 contacts →
	Indirect evidence “CMS Environmental Solutions is a stormwater compliance consultant providing NOI permitting, development, dewatering planning, site inspections, and custom stormwater management…” Source: RevenueBase Database · checked Sep 20, 2026
18	Montgomery & Associates	Partial evidence	Tucson, AZ, United StatesHQ checked Sep 20, 2026	51-200	126 contacts →
	Partial evidence “M&A is a water resource consulting firm that partners with clients to address their evolving water resource challenges.” Source: RevenueBase Database · checked Sep 20, 2026
19	G2 Consulting Group, LLC	Partial evidence	Troy, MI, United StatesHQ checked Sep 20, 2026	51-200	117 contacts →
	Partial evidence “G2 Consulting Group, LLC is a consulting engineering firm providing geotechnical, geoenvironmental, and construction engineering services.” Source: RevenueBase Database · checked Sep 20, 2026
20	Geotechnology, LLC	Indirect evidence	Saint Louis, MO, United StatesHQ checked Sep 20, 2026	201-500	117 contacts →
	Indirect evidence “Geotechnology, LLC provides geotechnical engineering, environmental sciences, geophysics, construction materials testing, non-destructive testing, water resource management and…” Source: RevenueBase Database · checked Sep 20, 2026
21	Skelly And Loy, Inc., A Terracon Company	Indirect evidence	Harrisburg, PA, United StatesHQ checked Sep 20, 2026	51-200	108 contacts →
	Indirect evidence “Established in 1969, Skelly and Loy is a privately owned, mid-sized corporation with 6 Mid-Atlantic offices.” Source: RevenueBase Database · checked Sep 20, 2026
22	Geo-Logic Associates, INC	Partial evidence	Ontario, CA, United StatesHQ checked Sep 20, 2026	201-500	106 contacts →
	Partial evidence “Geo-Logic Associates, Inc.(GLA) is an employee-owned, multidisciplinary consulting firm.” Source: RevenueBase Database · checked Sep 20, 2026
23	Ground Water Treatment & Technology, LLC	Indirect evidence	Wharton, NJ, United StatesHQ checked Sep 20, 2026	51-200	106 contacts →
	Indirect evidence “GWTT is one of the only U.S.” Source: RevenueBase Database · checked Sep 20, 2026
24	Blade Energy Partners	Partial evidence	Frisco, TX, United StatesHQ checked Sep 20, 2026	51-200	103 contacts →
	Partial evidence “Founded in Blade Energy Partners is an independent consulting company known for overcoming the challenges of complex multidisciplinary projects in the oil, gas, and geothermal…” Source: RevenueBase Database · checked Sep 20, 2026
25	EEC Environmental	Partial evidence	Orange, CA, United StatesHQ checked Sep 20, 2026	11-50	96 contacts →
	Partial evidence “EEC Environmental is a national environmental consulting firm that specializes in water, wastewater, stormwater, regulatory compliance, safety, and assessment and remediation of…” Source: RevenueBase Database · checked Sep 20, 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: groundwater consulting companies. 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 groundwater consulting companies.
Partial evidence: Its own public description names part of groundwater consulting companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name groundwater consulting companies. 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 1,041 groundwater consulting companies based in the United States

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Groundwater consulting companies based in the United States at a glance

As of Sep 20, 2026

41.6%Verified-email coverage

31.4Average contacts per company

1-10Median size (employees)

2.7%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

578

11-50

344

51-200

201-500

501-1,000

1,001-5,000

5,001-10,000

10001+

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 1,041 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 groundwater consulting companies, 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 the United States whose own description of what they do matches “groundwater consulting companies”. 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 groundwater consulting companies), 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 groundwater consulting companies, and records with no verified work email. Companies headquartered outside United States 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, 13,598 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 20, 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.

Groundwater consulting companies by metro

Groundwater consulting companies in Houston28

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 groundwater consulting companies, 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 groundwater consulting companies are there based in the United States?

RevenueBase identified 1,041 groundwater consulting companies headquartered in the 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?

Tetra Tech, headquartered in Pasadena, tops this list with the largest team on record.

Which city has the most groundwater consulting companies?

Houston leads with 28 headquartered companies, followed by Denver (19) and Portland (12).

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 13,598 verified decision-maker contacts tracked across these 1,041 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 20, 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.