Company lists · Data refreshed September 2026

Top 25 Wastewater engineering companies based in Germany

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

Compiled by the RevenueBase Data Team Data refreshed Sep 19, 2026 537 companies tracked

RevenueBase identified 537 wastewater engineering companies headquartered in Germany as of September 2026 and tracks 5,173 professional contacts across them, including 1,868 with verified work emails. Berlin is the largest hub.

This list covers wastewater engineering 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 19, 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 19, 2026 86% judged on-target in blind review

537Companies

5,173Contacts tracked

1,868Verified emails

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The 25 largest wastewater engineering companies based in Germany

Ranked by team size

Top 25 of 537 wastewater engineering companies based in Germany, ranked by team size, largest first. Data refreshed Sep 19, 2026. RevenueBase Smart Search rates how each company's information relates to wastewater engineering 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	Kessel Drainage Technology	Partial evidence	Lenting, GermanyHQ checked Sep 19, 2026	501-1,000	243 contacts →
	Partial evidence “Draining water, treating wastewater and protecting against backwater: As drainage specialists, we protect people from the power of water and protect water from people.” Source: RevenueBase Database · checked Sep 19, 2026
2	WTE Wassertechnik Gmbh	Indirect evidence	E, GermanyHQ checked Sep 19, 2026	501-1,000	242 contacts →
	Indirect evidence “Optimierung.” Source: RevenueBase Database · checked Sep 19, 2026
3	Ludwig Pfeiffer Hoch- UND Tiefbau Gmbh & Co. KG	Indirect evidence	Leipzig, GermanyHQ checked Sep 19, 2026	501-1,000	200 contacts →
	Indirect evidence “Im Jahr 1991 mit dem Fokus auf Wasserversorgung und Abwasserbeseitigung gegründet, operiert unsere Unternehmensgruppe heute in Deutschland und Österreich.” Source: RevenueBase Database · checked Sep 19, 2026
4	Aqseptence Group	Indirect evidence	Aarbergen, GermanyHQ checked Sep 19, 2026	1,001-5,000	153 contacts →
	Indirect evidence “Water is becoming one of the defining challenges of our century.” Source: RevenueBase Database · checked Sep 19, 2026
5	Envirochemie Gmbh	Indirect evidence	Rossdorf, GermanyHQ checked Sep 19, 2026	1,001-5,000	146 contacts →
	Indirect evidence “EnviroChemie is a system provider for holistic industrial water management.” Source: RevenueBase Database · checked Sep 19, 2026
6	Stadtentwässerungsbetriebe Köln, AÖR	Indirect evidence	Köln, GermanyHQ checked Sep 19, 2026	501-1,000	140 contacts →
	Indirect evidence “Stadtentwässerungsbetriebe Köln, AöR is a government administration company based out of Ostmerheimer Str.” Source: RevenueBase Database · checked Sep 19, 2026
7	Passavant Energy & Environment	Indirect evidence	Frankfurt, GermanyHQ checked Sep 19, 2026	51-200	134 contacts →
	Indirect evidence “Passavant has always been a name synonymous with excellence of execution through innovation.” Source: RevenueBase Database · checked Sep 19, 2026
8	BWT Wassertechnik Gmbh	Indirect evidence	Schriesheim, GermanyHQ checked Sep 19, 2026	201-500	115 contacts →
	Indirect evidence “Wasser ist nicht nur eine kostbare Lebensressource, sondern auch eine der großen Herausforderungen dieses Jahrhunderts.” Source: RevenueBase Database · checked Sep 19, 2026
9	PWT Wasser- UND Abwassertechnik Gmbh	Indirect evidence	Zwingenberg, GermanyHQ checked Sep 19, 2026	51-200	113 contacts →
	Indirect evidence “We from PWT Wasser- und Abwassertechnik GmbH with headquarter in Zwingenberg Germany (Close to Frankfurt am Main, Mannheim and Darmstadt) are speacialized as turnkey supplier…” Source: RevenueBase Database · checked Sep 19, 2026
10	Hölscher	Indirect evidence	Haren, GermanyHQ checked Sep 19, 2026	501-1,000	88 contacts →
	Indirect evidence “Water has been our passion for more than 60 years.” Source: RevenueBase Database · checked Sep 19, 2026
11	RBS Wave Gmbh	Indirect evidence	Stuttgart, GermanyHQ checked Sep 19, 2026	51-200	88 contacts →
	Indirect evidence “Seit Jahrzehnten steht RBS wave für zuverlässiges und innovatives Know-how im Bereich Ingenieurdienstleistungen.” Source: RevenueBase Database · checked Sep 19, 2026
12	Dahlem Beratende Ingenieure Gmbh & Co. Wasserwirtschaft KG	Partial evidence	Essen, GermanyHQ checked Sep 19, 2026	51-200	81 contacts →
	Partial evidence “DAHLEM is an engineering company headquartered in Essen, Germany, with offices in Darmstadt, Würzburg, Berlin, Stuttgart, Montenegro and Albania.” Source: RevenueBase Database · checked Sep 19, 2026
13	Wehrle	Partial evidence	Emmendingen, GermanyHQ checked Sep 19, 2026	201-500	76 contacts →
	Partial evidence “Industry wastewater and Leachate treatment Equipment rental and operation Industrie Abwasser und Sickerwasser behandlung Mietanlage und Betrieb” Source: RevenueBase Database · checked Sep 19, 2026
14	HST Systemtechnik Gmbh & Co.Kg	Partial evidence	Meschede, GermanyHQ checked Sep 19, 2026	201-500	72 contacts →
	Partial evidence “HST Systemtechnik is a provider for products, systems and solutions for the water and wastewater market worldwide since 1985, with more than project references.” Source: RevenueBase Database · checked Sep 19, 2026
15	Jung Pumpen Gmbh	Partial evidence	Steinhagen, GermanyHQ checked Sep 19, 2026	201-500	64 contacts →
	Partial evidence “For more than 100 years JUNG PUMPEN has been a reliable partner for sewage and wastewater disposal.” Source: RevenueBase Database · checked Sep 19, 2026
16	Bauer Resources Gmbh	Indirect evidence	Schrobenhausen, GermanyHQ checked Sep 19, 2026	1,001-5,000	59 contacts →
	Indirect evidence “Die BAUER Resources GmbH ist der Geschäftsbereich für Umweltdienstleistungen der BAUER Gruppe mit Sitz in Schrobenhausen.” Source: RevenueBase Database · checked Sep 19, 2026
17	Zahnen Technik Gmbh	Indirect evidence	Arzfeld, GermanyHQ checked Sep 19, 2026	51-200	56 contacts →
	Indirect evidence “WEIL JEDER MENSCH DAS RECHT AUF SAUBERES WASSER HAT!” Source: RevenueBase Database · checked Sep 19, 2026
18	Steinzeug Keramo Group	Partial evidence	Frechen, GermanyHQ checked Sep 19, 2026	201-500	54 contacts →
	Partial evidence “Steinzeug Keramo, a company of the Wienerberger AG, is a solutions and system supplier for the water and wastewater industry.” Source: RevenueBase Database · checked Sep 19, 2026
19	GI Aqua Tech	Partial evidence	Groß-gerau, GermanyHQ checked Sep 19, 2026	51-200	49 contacts →
	Partial evidence “GI AQUA TECH provides innovative wastewater treatment solutions, committed to a sustainable future for people and planet.” Source: RevenueBase Database · checked Sep 19, 2026
20	Lindschulte Baden-Baden	Indirect evidence	Hügelsheim, GermanyHQ checked Sep 19, 2026	51-200	48 contacts →
	Indirect evidence “WALD + CORBE hat sich zu einem namhaften Ingenieurbüro mit mehreren Standorten in den Bereichen Wasserwirtschaft, Wasserbau, Infrastruktur und Ökologie + Umwelt entwickelt.” Source: RevenueBase Database · checked Sep 19, 2026
21	Isas Gmbh	Indirect evidence	Füssen, GermanyHQ checked Sep 19, 2026	51-200	45 contacts →
	Indirect evidence “Das ISAS-Team ist seit über 35 Jahren ein zuverlässiger, hochspezialisierter und innovativer Partner in allen Fragestellungen rund um bestehende Abwassersysteme und deren…” Source: RevenueBase Database · checked Sep 19, 2026
22	Invent Umwelt- UND Verfahrenstechnik AG	Indirect evidence	Erlangen, GermanyHQ checked Sep 19, 2026	51-200	45 contacts →
	Indirect evidence “INVENT Umwelt- und Verfahrenstechnik AG - Leaders in mixing and aeration Water is the origin and source of all life.” Source: RevenueBase Database · checked Sep 19, 2026
23	Inwatec Gmbh & Co. KG	Indirect evidence	Bergheim, GermanyHQ checked Sep 19, 2026	51-200	42 contacts →
	Indirect evidence “INWATEC was founded in and has since established itself as a leading player in water treatment in Germany and Europe.” Source: RevenueBase Database · checked Sep 19, 2026
24	Herco Wassertechnik Gmbh	Indirect evidence	Freiberg Am Neckar, GermanyHQ checked Sep 19, 2026	51-200	40 contacts →
	Indirect evidence “WATER TREATMENT MADE IN GERMANY.” Source: RevenueBase Database · checked Sep 19, 2026
25	Water Treatment Systems	Indirect evidence	Kettenbach, GermanyHQ checked Sep 19, 2026	201-500	39 contacts →
	Indirect evidence “Water Treatment’s product portfolio covers a range of water and waste water treatment processes with a focus on headworks, mechanical treatment and biological solutions deployed…” Source: RevenueBase Database · checked Sep 19, 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: wastewater engineering 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 wastewater engineering companies.
Partial evidence: Its own public description names part of wastewater engineering companies, so it works in or next to the category without describing itself that way.
Indirect evidence: The description shown does not name wastewater engineering 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 537 wastewater engineering companies based in Germany

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Wastewater engineering companies based in Germany at a glance

As of Sep 19, 2026

36.1%Verified-email coverage

9.6Average contacts per company

11-50Median size (employees)

3.5%Largest-city concentration · Berlin

Sep 19, 2026Page data refreshed

Companies by employee count

1-10

229

11-50

186

51-200

201-500

501-1,000

1,001-5,000

10001+

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 537 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 wastewater engineering 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 “wastewater engineering 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 wastewater engineering 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 wastewater engineering 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, 1,868 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 19, 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 wastewater engineering 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 wastewater engineering companies are there based in Germany?

RevenueBase identified 537 wastewater engineering 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?

Kessel Drainage Technology, headquartered in Lenting, tops this list with the largest team on record.

Which city has the most wastewater engineering companies?

Berlin leads with 19 headquartered companies, followed by Dresden (15) and Hamburg (10).

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 1,868 verified decision-maker contacts tracked across these 537 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 19, 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.