Company lists · Data refreshed September 2026

Top 25 Groundwater protection services based in the United States

Name: Groundwater protection services 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 214 companies tracked

RevenueBase identified 214 groundwater protection services headquartered in the United States as of September 2026 and tracks 2,173 professional contacts across them, including 1,099 with verified work emails. Houston is the largest hub.

This list covers groundwater protection services 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

214Companies

2,173Contacts tracked

1,099Verified emails

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The 25 largest groundwater protection services based in the United States

Ranked by team size

Top 25 of 214 groundwater protection services 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 protection services: 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	Ensolum, LLC	Indirect evidence	Dallas, TX, United StatesHQ checked Sep 20, 2026	51-200	136 contacts →
	Indirect evidence “OUR MISSION is to combine sustainable environmental solutions with forward-thinking, cost-effective, innovative, and value-added technologies that balance our clients’ economic…” Source: RevenueBase Database · checked Sep 20, 2026
2	Ensero Solutions	Indirect evidence	Fort Collins, CO, United StatesHQ checked Sep 20, 2026	51-200	129 contacts →
	Indirect 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
3	EEC Environmental	Indirect evidence	Orange, CA, United StatesHQ checked Sep 20, 2026	11-50	96 contacts →
	Indirect 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
4	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
5	Hydrocorp	Partial evidence	Troy, MI, United StatesHQ checked Sep 20, 2026	51-200	87 contacts →
	Partial evidence “For more than four decades, HydroCorp has been dedicated to protecting piping infrastructure, ensuring safe drinking water, and supporting regulatory compliance across industries.” Source: RevenueBase Database · checked Sep 20, 2026
6	Zone 7 Water Agency	Partial evidence	Livermore, United StatesHQ checked Sep 20, 2026	51-200	85 contacts →
	Partial evidence “We provide excellent water and flood protection services to enhance the quality of life, economic vitality and environmental health of the communities we serve.” Source: RevenueBase Database · checked Sep 20, 2026
7	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
8	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
9	Weisinger Incorporated	Indirect evidence	Willis, TX, United StatesHQ checked Sep 20, 2026	201-500	56 contacts →
	Indirect evidence “Authentic relationships are standard practice at Weisinger Incorporated.” Source: RevenueBase Database · checked Sep 20, 2026
10	Water Replenishment District	Strong evidence	Lakewood, CA, United StatesHQ checked Sep 20, 2026	11-50	51 contacts →
	Strong evidence “The Water Replenishment District of Southern California (WRD) is the largest groundwater agency in the State of California, managing and protecting local groundwater resources for…” Source: RevenueBase Database · checked Sep 20, 2026
11	S.S. Papadopulos & Associates, INC	Indirect evidence	Rockville, MD, United StatesHQ checked Sep 20, 2026	51-200	45 contacts →
	Indirect evidence “S.S.” Source: RevenueBase Database · checked Sep 20, 2026
12	National Ground Water Association	Partial evidence	Westerville, OH, United StatesHQ checked Sep 20, 2026	11-50	43 contacts →
	Partial evidence “The National Ground Water Association is the hallmark organization for anyone affiliated with the groundwater industry.” Source: RevenueBase Database · checked Sep 20, 2026
13	Clear Creek Associates	Partial evidence	Scottsdale, AZ, United StatesHQ checked Sep 20, 2026	11-50	42 contacts →
	Partial evidence “Clear Creek Associates, a hydrogeological consulting company, was started in September to provide a very high level of expertise in groundwater science.” Source: RevenueBase Database · checked Sep 20, 2026
14	EWMA	Indirect evidence	Parsippany, NJ, United StatesHQ checked Sep 20, 2026	51-200	39 contacts →
	Indirect evidence “EWMA is a 100% employee-owned Environmental Consulting & Remediation firm, servicing the private and public sectors in the Northeastern United States since 1987.” Source: RevenueBase Database · checked Sep 20, 2026
15	Hargis Associates, INC	Indirect evidence	San Diego, CA, United StatesHQ checked Sep 20, 2026	11-50	37 contacts →
	Indirect evidence “Hargis + Associates, Inc.(H+A) is an employee-owned, environmental consulting and engineering firm founded in 1979 with a commitment to providing high-quality, cost-effective…” Source: RevenueBase Database · checked Sep 20, 2026
16	Leaaf Environmental, LLC	Indirect evidence	Gretna, LA, United StatesHQ checked Sep 20, 2026	11-50	30 contacts →
	Indirect evidence “Leaaf Environmental, LLC (Leaaf) is a growing small business with over a decade of experience providing environmental services to both the public and private sectors in Louisiana…” Source: RevenueBase Database · checked Sep 20, 2026
17	AST Environmental, INC	Partial evidence	Midway, KY, United StatesHQ checked Sep 20, 2026	11-50	27 contacts →
	Partial evidence “We help our clients affect expeditious, quantifiable change to contamination in groundwater and soil by deploying thoughtful and powerful solutions, restoring value to sites and…” Source: RevenueBase Database · checked Sep 20, 2026
18	Dragun Corporation	Partial evidence	Farmington Hills, MI, United StatesHQ checked Sep 20, 2026	11-50	23 contacts →
	Partial evidence “Dragun Corporation’s focus since our founding in 1988 has been solving complex soil and groundwater challenges.” Source: RevenueBase Database · checked Sep 20, 2026
19	Geoscience Support Services, INC	Partial evidence	San Dimas, CA, United StatesHQ checked Sep 20, 2026	11-50	23 contacts →
	Partial evidence “Geoscience Support Services (GEOSCIENCE) provides vital, specialized consulting to help clients overcome their most complex groundwater resource challenges.” Source: RevenueBase Database · checked Sep 20, 2026
20	Pela Geoenvironmental	Indirect evidence	Tuscaloosa, AL, United StatesHQ checked Sep 20, 2026	11-50	22 contacts →
	Indirect evidence “PELA GeoEnvironmental is an environmental consulting firm based in Tuscaloosa, Alabama, USA.” Source: RevenueBase Database · checked Sep 20, 2026
21	Environmental Risk Management Ermi	Indirect evidence	Fort Myers, FL, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “ERMI helps developers, realtors, property owners, and lenders comply with ever-changing environmental regulations-and avoid the multiple costs of failing to do so.” Source: RevenueBase Database · checked Sep 20, 2026
22	Core Environmental Services, INC	Indirect evidence	Allison Park, PA, United StatesHQ checked Sep 20, 2026	11-50	21 contacts →
	Indirect evidence “CORE Environmental Services, Inc.(CORE) is a professional environmental consulting firm specializing in:* Site Characterization and Site Remediation * Environmental Due Diligence…” Source: RevenueBase Database · checked Sep 20, 2026
23	Capital Well Clean Water Center	Indirect evidence	Dunbarton, NH, United StatesHQ checked Sep 20, 2026	11-50	17 contacts →
	Indirect evidence “Capital Well Clean Water Center, since 1986, has provided the highest quality water care services.” Source: RevenueBase Database · checked Sep 20, 2026
24	Asrus, LLC	Indirect evidence	Tampa, FL, United StatesHQ checked Sep 20, 2026	11-50	16 contacts →
	Indirect evidence “ASRus, LLC, was founded in 2006 to provide hydrogeological and reuse related professional services to municipal and industrial clients in Florida.” Source: RevenueBase Database · checked Sep 20, 2026
25	Todd Groundwater	Strong evidence	Alameda, CA, United StatesHQ checked Sep 20, 2026	11-50	15 contacts →
	Strong evidence “Todd Groundwater is a groundwater consulting firm specializes in the planning, development, management, and protection of groundwater and related surface water resources.” 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 protection services. 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 protection services.
Partial evidence: Its own public description names part of groundwater protection services, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name groundwater protection services. 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 214 groundwater protection services based in the United States

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Groundwater protection services based in the United States at a glance

As of Sep 20, 2026

50.6%Verified-email coverage

10.2Average contacts per company

1-10Median size (employees)

1.4%Largest-city concentration · Houston

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

116

11-50

51-200

201-500

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 214 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 protection services, 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 protection services”. 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 protection services), 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 protection services, 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, 1,099 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 protection services, 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 protection services are there based in the United States?

RevenueBase identified 214 groundwater protection services 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?

Ensolum, LLC, headquartered in Dallas, tops this list with the largest team on record.

Which city has the most groundwater protection services?

Houston leads with 3 headquartered companies, followed by Lakewood (3) and Princeton (3).

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 1,099 verified decision-maker contacts tracked across these 214 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.