Company lists · Data refreshed September 2026

Top 25 Groundwater treatment companies based in Germany

Name: Groundwater treatment companies based in Germany
Creator: RevenueBase
License: https://creativecommons.org/licenses/by/4.0/

Compiled by the RevenueBase Data Team Data refreshed Sep 20, 2026 69 companies tracked

RevenueBase identified 69 groundwater treatment companies headquartered in Germany as of September 2026 and tracks 463 professional contacts across them, including 192 with verified work emails. Berlin is the largest hub.

This list covers groundwater treatment companies headquartered in Germany, 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

69Companies

463Contacts tracked

192Verified emails

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The 25 largest groundwater treatment companies based in Germany

Ranked by team size

Top 25 of 69 groundwater treatment companies based in Germany, ranked by team size, largest first. Data refreshed Sep 20, 2026. RevenueBase Smart Search rates how each company's information relates to groundwater treatment 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	Hölscher	Indirect evidence	Haren, GermanyHQ checked Sep 20, 2026	501-1,000	88 contacts →
	Indirect evidence “Water has been our passion for more than 60 years.” Source: RevenueBase Database · checked Sep 20, 2026
2	Koop Bronbemaling B.V. Koop Wasserbau Gmbh	Indirect evidence	Gildehaus, GermanyHQ checked Sep 20, 2026	51-200	87 contacts →
	Indirect evidence “Wij zorgen voor droge voeten!” Source: RevenueBase Database · checked Sep 20, 2026
3	Cornelsen Group	Indirect evidence	Essen, GermanyHQ checked Sep 20, 2026	51-200	35 contacts →
	Indirect evidence “Headquartered in Essen (Germany), with a branch in Nailsea (United Kingdom), Stockholm (Sweden) and Boston,(US) Cornelsen Group has been at the forefront of innovative remediation…” Source: RevenueBase Database · checked Sep 20, 2026
4	Almawatech	Indirect evidence	Babenhausen, GermanyHQ checked Sep 20, 2026	51-200	20 contacts →
	Indirect evidence “ALMAWATECH – Anlagenbau & Prozesslösungen für industrielle Wassertechnik Die ALMAWATECH GmbH ist ein familiengeführtes Unternehmen mit langer Tradition in der industriellen…” Source: RevenueBase Database · checked Sep 20, 2026
5	Xylem Water Solutions Herford Gmbh	Indirect evidence	Herford, GermanyHQ checked Sep 20, 2026	11-50	19 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
6	Schaub Umwelttechnik Gmbh	Indirect evidence	Augsburg, GermanyHQ checked Sep 20, 2026	11-50	15 contacts →
	Indirect evidence “Wir sind Spezialisten für Kalk- und Pulveraktivkohle-Anlagen Kalk und Pulveraktivkohle werden eingesetzt, um Wasser aufzubereiten und Abgase zu reinigen.” Source: RevenueBase Database · checked Sep 20, 2026
7	IEG Technologie Gmbh	Partial evidence	Mühlhausen, GermanyHQ checked Sep 20, 2026	11-50	11 contacts →
	Partial evidence “IEG specializes in in-situ soil and groundwater remediation and is a leading supplier of equipment and processes for hydraulic, microbiological and chemical remediation.” Source: RevenueBase Database · checked Sep 20, 2026
8	Bremer PRO Aqua Wasser- UND Abwassertechnik Gmbh	Indirect evidence	Bremen, GermanyHQ checked Sep 20, 2026	11-50	8 contacts →
	Indirect evidence “Die Bremer pro aqua Wasser- und Abwasser GmbH arbeitet mit einem seit Jahren eingespielten Team aus hochqualifizierten und erfahrenen Ingenieuren, Technikern und Monteuren.” Source: RevenueBase Database · checked Sep 20, 2026
9	Leyco Wassertechnik Gmbh	Partial evidence	Föritztal, GermanyHQ checked Sep 20, 2026	11-50	8 contacts →
	Partial evidence “The service portfolio ranges from the design, construction and maintenance of complete water treatment plants for industry and commerce to the sale of individual components of…” Source: RevenueBase Database · checked Sep 20, 2026
10	Aqua Plus Wasser- UND Recyclingsysteme Gmbh	Indirect evidence	Böbingen An Der Rems, GermanyHQ checked Sep 20, 2026	11-50	7 contacts →
	Indirect evidence “Die aqua plus Wasser- und Recyclingsysteme GmbH mit Sitz in Böbingen an der Rems (Deutschland) ist ein dynamisches, innovatives Unternehmen im Bereich industriellen Wasser- und…” Source: RevenueBase Database · checked Sep 20, 2026
11	Reconsite Gmbh	Indirect evidence	Fellbach, GermanyHQ checked Sep 20, 2026	11-50	7 contacts →
	Indirect evidence “reconsite GmbH is an environmental services company based out of Auberlenstraße 13, Fellbach, Baden-Wuerttemberg, Germany.” Source: RevenueBase Database · checked Sep 20, 2026
12	Prantner Gmbh Verfahrenstechnik	Indirect evidence	Reutlingen, GermanyHQ checked Sep 20, 2026	11-50	6 contacts →
	Indirect evidence “Since 1982, we have been developing and building processes and systems to reduce the burden on the environment.” Source: RevenueBase Database · checked Sep 20, 2026
13	Waves Wassertechnik Vertrieb Service Gmbh	Indirect evidence	Ebensfeld, GermanyHQ checked Sep 20, 2026	1-10	6 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
14	UTP Umwelttechnik Pöhnl Gmbh	Partial evidence	Seybothenreuth, GermanyHQ checked Sep 20, 2026	11-50	6 contacts →
	Partial evidence “utp umwelttechnik specializes in developing and implementing innovative water and wastewater treatment systems for municipal and industrial applications.” Source: RevenueBase Database · checked Sep 20, 2026
15	Gross Wassertechnik Gmbh	Indirect evidence	Keltern, GermanyHQ checked Sep 20, 2026	11-50	5 contacts →
	Indirect evidence “Wir planen und bauen Anlagen für Wasseraufbereitung und Abwassertechnik in industriellen Anwendungen.” Source: RevenueBase Database · checked Sep 20, 2026
16	WTO Wassertechnik Ostbayern Gmbh	Indirect evidence	Regensburg, GermanyHQ checked Sep 20, 2026	11-50	5 contacts →
	Indirect evidence “Systemlösungen sowohl für Privathaushalte als auch für Gewerbe, Industrie und Kommunen garantieren mit unseren Wasseraufbereitungsanlagen beste Trinkwasserqualität.” Source: RevenueBase Database · checked Sep 20, 2026
17	Rebecca Filter Gmbh	Indirect evidence	Mannheim, GermanyHQ checked Sep 20, 2026	11-50	4 contacts →
	Indirect evidence “Eine klare Sache für Industrie, Gewerbe und Handel sowie für Bad, Küche, Schwimmbad und andere Bereiche im privaten Haushalt: Wasseraufbereitungssysteme plus kompetente Beratung…” Source: RevenueBase Database · checked Sep 20, 2026
18	Intrapore	Partial evidence	Essen, GermanyHQ checked Sep 20, 2026	11-50	4 contacts →
	Partial evidence “Intrapore GmbH is a provider of innovative methods for in situ groundwater and contaminated site remediation and the leading provider in particle-based in situ groundwater…” Source: RevenueBase Database · checked Sep 20, 2026
19	Steffen Hartmann Recyclingtechnologien Gmbh	Indirect evidence	Thale, GermanyHQ checked Sep 20, 2026	51-200	4 contacts →
	Indirect evidence “STEFFEN HARTMANN RECYCLINGTECHNOLOGIEN GMBH is a water technology company that provides cost-effective and environment-friendly solutions since 1992 based on different products…” Source: RevenueBase Database · checked Sep 20, 2026
20	DE VET Wasserbau Gmbh	Indirect evidence	Goch, GermanyHQ checked Sep 20, 2026	11-50	4 contacts →
	Indirect evidence “De Vet Wasserbau ist Experte für Brunnenbohrungen und den Bau von Grubenentwässerungen.” Source: RevenueBase Database · checked Sep 20, 2026
21	Z-Design Umwelttechnik Gmbh	Indirect evidence	Owingen, GermanyHQ checked Sep 20, 2026	1-10	3 contacts →
	Indirect evidence “Z-Design Dipl-Ing.” Source: RevenueBase Database · checked Sep 20, 2026
22	Walter Clausen Gmbh	Indirect evidence	Quickborn, GermanyHQ checked Sep 20, 2026	11-50	3 contacts →
	Indirect evidence “Walter Clausen GmbH is a dewatering company based out of Pascalstraße 15, Quickborn, Schleswig-Holstein, Germany.” Source: RevenueBase Database · checked Sep 20, 2026
23	AJF Group Engineering Gmbh	Partial evidence	Egg An Der Günz, GermanyHQ checked Sep 20, 2026	11-50	2 contacts →
	Partial evidence “Zementwasseraufbereitung; Restwasseraufbereitung; pH-Neutralisierung; Mikrofiltration; Cement-Water-Treatment; Water treatment plants; pH-neutralization; Microfiltration; Wir sind…” Source: RevenueBase Database · checked Sep 20, 2026
24	W & S Wassertechnik Gmbh	Indirect evidence	Berlin, GermanyHQ checked Sep 20, 2026	1-10	2 contacts →
	Indirect evidence Source: RevenueBase Database · checked Sep 20, 2026
25	Pfaff Wassertechnik Gmbh	Indirect evidence	Kassel, GermanyHQ checked Sep 20, 2026	11-50	2 contacts →
	Indirect evidence “Wasser verstehen – das ist unser Geschäft.” 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 treatment 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 treatment companies.
Partial evidence: Its own public description names part of groundwater treatment companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name groundwater treatment 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 69 groundwater treatment companies based in Germany

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Groundwater treatment companies based in Germany at a glance

As of Sep 20, 2026

41.5%Verified-email coverage

6.7Average contacts per company

11-50Median size (employees)

13.0%Largest-city concentration · Berlin

Sep 20, 2026Page data refreshed

Companies by employee count

1-10

11-50

51-200

201-500

501-1,000

Email recency for this list is measured worldwide rather than for Germany, so it is reported there. Company counts and contact totals on this page are exact for Germany, over 69 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 treatment 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 Germany whose own description of what they do matches “groundwater treatment 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 treatment 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 treatment companies, and records with no verified work email. Companies headquartered outside Germany 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, 192 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 treatment 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 treatment companies are there based in Germany?

RevenueBase identified 69 groundwater treatment companies headquartered in Germany 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?

Hölscher, headquartered in Haren, tops this list with the largest team on record.

Which city has the most groundwater treatment companies?

Berlin leads with 9 headquartered companies, followed by Essen (2) and Hamburg (2).

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 192 verified decision-maker contacts tracked across these 69 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.