Company lists · Data refreshed September 2026

Top 25 Groundwater assessment companies based in the United States

Name: Groundwater assessment 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 575 companies tracked

RevenueBase identified 575 groundwater assessment companies headquartered in the United States as of September 2026 and tracks 7,370 professional contacts across them, including 3,340 with verified work emails. Houston is the largest hub.

This list covers groundwater assessment 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

575Companies

7,370Contacts tracked

3,340Verified emails

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The 25 largest groundwater assessment companies based in the United States

Ranked by team size

Top 25 of 575 groundwater assessment 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 assessment 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	Alpha Analytical	Indirect evidence	Westborough, MA, United StatesHQ checked Sep 20, 2026	501-1,000	254 contacts →
	Indirect evidence “Since 1987, Alpha Analytical, Inc.” Source: RevenueBase Database · checked Sep 20, 2026
2	Enviroscience, INC	Indirect evidence	Stow, OH, United StatesHQ checked Sep 20, 2026	51-200	176 contacts →
	Indirect evidence “EnviroScience is a team of over 150 expert biologists, commercial divers, environmental engineers, and environmental scientists that provides biomonitoring, environmental…” Source: RevenueBase Database · checked Sep 20, 2026
3	Herrera Environmental Consultants	Indirect evidence	Seattle, WA, United StatesHQ checked Sep 20, 2026	51-200	176 contacts →
	Indirect 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
4	In-Situ Environmental	Partial evidence	Fort Collins, CO, United StatesHQ checked Sep 20, 2026	201-500	170 contacts →
	Partial evidence “In-Situ simplifies water monitoring for surface water, coastal, groundwater, aquaculture, drinking water and wastewater applications with reliable, low-maintenance instrumentation…” Source: RevenueBase Database · checked Sep 20, 2026
5	EKI Environment & Water, INC	Indirect evidence	Daly City, CA, United StatesHQ checked Sep 20, 2026	51-200	167 contacts →
	Indirect evidence “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…” Source: RevenueBase Database · checked Sep 20, 2026
6	Advanced Environmental Laboratories, INC	Indirect evidence	Jacksonville, FL, United StatesHQ checked Sep 20, 2026	51-200	158 contacts →
	Indirect evidence “Advanced Environmental Laboratories, Inc.(AEL) is a NELAP/TNI and DOD certified, national full-service laboratory firm, headquartered in Jacksonville, Florida, with additional…” Source: RevenueBase Database · checked Sep 20, 2026
7	Mostardi Platt	Indirect evidence	Elmhurst, IL, United StatesHQ checked Sep 20, 2026	51-200	140 contacts →
	Indirect evidence “Since the passage of original environmental legislation nearly four decades ago, both private and public industry have turned to Mostardi Platt for guidance in complying with air…” Source: RevenueBase Database · checked Sep 20, 2026
8	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
9	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
10	Montgomery & Associates	Indirect evidence	Tucson, AZ, United StatesHQ checked Sep 20, 2026	51-200	126 contacts →
	Indirect 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
11	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
12	Broadbent & Associates, INC	Indirect evidence	Henderson, NV, United StatesHQ checked Sep 20, 2026	51-200	106 contacts →
	Indirect evidence “Broadbent & Associates, Inc.(Broadbent) is an established environmental, water resources, and civil engineering firm.” Source: RevenueBase Database · checked Sep 20, 2026
13	Geo-Logic Associates, INC	Indirect evidence	Ontario, CA, United StatesHQ checked Sep 20, 2026	201-500	106 contacts →
	Indirect evidence “Geo-Logic Associates, Inc.(GLA) is an employee-owned, multidisciplinary consulting firm.” Source: RevenueBase Database · checked Sep 20, 2026
14	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
15	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
16	LRE Water A Spheros Environmental Company	Indirect evidence	Denver, CO, United StatesHQ checked Sep 20, 2026	51-200	94 contacts →
	Indirect evidence “LRE Water is now Spheros Environmental.” Source: RevenueBase Database · checked Sep 20, 2026
17	Hydro Resources Holdings, INC	Partial evidence	Sugar Land, TX, United StatesHQ checked Sep 20, 2026	201-500	92 contacts →
	Partial evidence “Hydro Resources specializes in providing the complete solution in the development and maintenance of your groundwater project.” Source: RevenueBase Database · checked Sep 20, 2026
18	Daniel B. Stephens & Associates, INC	Indirect evidence	Albuquerque, NM, United StatesHQ checked Sep 20, 2026	51-200	92 contacts →
	Indirect evidence “Daniel B.” Source: RevenueBase Database · checked Sep 20, 2026
19	Larry Walker Associates	Indirect evidence	Davis, CA, United StatesHQ checked Sep 20, 2026	51-200	79 contacts →
	Indirect evidence “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.” Source: RevenueBase Database · checked Sep 20, 2026
20	A. G. Wassenaar, INC	Indirect evidence	Englewood, CO, United StatesHQ checked Sep 20, 2026	51-200	74 contacts →
	Indirect evidence “Founded in 1972, AGW is a multi-disciplined consulting engineering firm specializing in the geosciences and environmental services.” Source: RevenueBase Database · checked Sep 20, 2026
21	Princeton Hydro	Indirect evidence	Trenton, NJ, United StatesHQ checked Sep 20, 2026	51-200	71 contacts →
	Indirect evidence “Experience, Expertise and Excellence in Water Resources, Ecology, and Geotechnical Engineering.” Source: RevenueBase Database · checked Sep 20, 2026
22	Cgrs INC	Indirect evidence	Fort Collins, CO, United StatesHQ checked Sep 20, 2026	51-200	70 contacts →
	Indirect evidence “We deliver quality solutions with integrity and expertise, every time.” Source: RevenueBase Database · checked Sep 20, 2026
23	Teklab, INC	Indirect evidence	Collinsville, IL, United StatesHQ checked Sep 20, 2026	201-500	68 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
24	GSI Water Solutions, INC	Partial evidence	Portland, OR, United StatesHQ checked Sep 20, 2026	51-200	66 contacts →
	Partial evidence “GSI Water Solutions, Inc, is a specialized groundwater, environmental, and water resources consulting firm.” Source: RevenueBase Database · checked Sep 20, 2026
25	Stone Environmental	Indirect evidence	Montpelier, VT, United StatesHQ checked Sep 20, 2026	51-200	65 contacts →
	Indirect evidence “Stone Environmental is a 100% employee-owned environmental science and engineering firm based in Montpelier, Vermont.” 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 assessment 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 assessment companies.
Partial evidence: Its own public description names part of groundwater assessment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name groundwater assessment 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 575 groundwater assessment companies based in the United States

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Groundwater assessment companies based in the United States at a glance

As of Sep 20, 2026

45.3%Verified-email coverage

12.8Average contacts per company

11-50Median size (employees)

1.9%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

279

11-50

216

51-200

201-500

501-1,000

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 575 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 assessment 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 assessment 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 assessment 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 assessment 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, 3,340 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.

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 assessment 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 assessment companies are there based in the United States?

RevenueBase identified 575 groundwater assessment 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?

Alpha Analytical, headquartered in Westborough, tops this list with the largest team on record.

Which city has the most groundwater assessment companies?

Houston leads with 11 headquartered companies, followed by Seattle (7) and New York (6).

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 3,340 verified decision-maker contacts tracked across these 575 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.