ranQ
ranQ
ranQ
DirectoryIndustriesKnowledgeComparisonsSoon
Sign inCheck visibility
ranQHSG Startup LabelRecognised by the
HSG Startup Label

The first Swiss company directory, built to boost AI visibility.

Product
  • Pricing
  • Directory
  • Industries
Company
  • About
  • Contact
  • Legal
© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint744,877 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil EngineeringKlingnauW. Frei AG Klingnau
W. Frei AG Klingnau Logo
Verified· 4 sources

W. Frei AG Klingnau

Summary

About the company

The core activity of W. FREI AG is in the field of environmental technology, particularly in wastewater treatment. In this area, the company offers various services and products, including: wastewater treatment plant equipment, pipeline and metal construction, biogas plants, representation of foreign products, consulting, planning, design, manufacturing and installation of equipment for environmental technology. Thus, the company offers a comprehensive range of services in the field of environmental technology and wastewater treatment.

AI-generated
Offering

Products & services

Industry:Civil Engineering
✓ Offered3
LeadhubOutbound Leads by COHAGA

Looking for direct email addresses and phone numbers?

Leadhub delivers verified contact details and decision-makers from over 750,000 Swiss companies — management, procurement, marketing, HR.

Discover Leadhub
Wastewater treatment plant equipment
Mechanical equipment for wastewater treatment plants, stormwater basins, pumping stations and reservoirs; consulting, planning, design, manufacturing and installation for wastewater treatment throughout Switzerland.
Pipeline construction
Planning, design, production, installation and repair of pipelines made of stainless steel and plastic for water, wastewater, sludge, gas, power plants as well as the food and chemical industries.
Stainless steel pickling
Pickling of stainless steel components after welding; pre-cleaning and degreasing on request, full-bath pickling, washing, rinsing and inspection before collection.
Reviews

Aggregated rating

Aggregated rating
4.9
of 5

Aggregated from 7 reviews across all connected sources

Sources
GGoogle4.97
★TrustpilotSoon
PProvenExpertSoon

Further sources are added continuously and factored into the ranQ Rating.

Press

Media

December 13, 2025Media
50 Jahre W. Frei AG aus Klingnau: Vom Einmannbetrieb zum Leader bei Kläranlagen
aargauerzeitung.ch

Knowledge

No knowledge articles yet

Once W. Frei AG Klingnau has claimed this profile, we'll publish editorial articles and case studies here together.

Get started
Comparisons

W. Frei AG Klingnau in comparison

Soon

Industry comparisons are coming soon

We're preparing industry comparisons that rank W. Frei AG Klingnau by reviews, experience and specialisations.

Is this your company?

Claim the company profile of W. Frei AG Klingnau to make its contact details visible. With a plan we additionally create and publish industry comparisons, articles and much more.

Secure profile

Location

Brühlstrasse 25
5313 Klingnau
Opening hours
Mon
07:00 - 17:00
Tue
07:00 - 17:00
Wed
07:00 - 17:00
Thu
07:00 - 17:00
Fri
07:00 - 17:00
Sat
Closed
Sun
Closed

At a glance

Legal form
Corporation
UID
CHE-107.902.341
Founded
1975 · 51 years
Last commercial register change
September 19, 2025
Employees
21 to 50

Similar companies

LB
Loosli Bau AG
Schmiedrued
RA
Rohrputz-Loriol AG
Spreitenbach
KV
Karl Vögele Hoch- und Tiefbau AG
Leuggern
DB
Domino Bau GmbH
Tennwil