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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,887 companies indexed · Last updated: today
DirectoryConstruction & ArchitectureCivil EngineeringKlingnauW. Frei AG Klingnau
W. Frei AG Klingnau Logo
Verified· 4 sourcesTrust Score
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.

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Products & services

Industry:Civil Engineering
✓ Offered3
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W. Frei AG Klingnau

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.
Trust & reputation

ranQ Trust Score of W. Frei AG Klingnau: 4.2 out of 5.0

Trust Score4.2/ 5.0

Very high

x

Data basis 100% · As of October 2026

W. Frei AG Klingnau scores 76.0 out of 100 points in the Reputation area of the ranQ Trust Score. This area carries 42% of the weighting.
x
CriterionValueWeight
  • Review quality: The average rating across all connected sources, smoothed against the industry mean. So 5.0 stars from three reviews do not outrank 4.7 from three hundred.79.224%
  • Review volume: The number of reviews across all sources. The scale is logarithmic: the first reviews count the most, and the maximum is reached at 50 reviews.58.610%
  • Review recency: The age of the most recent review. Two-year-old reviews deliberately sit in the middle, because that is normal for Swiss SMEs. Only after three years without a new voice does the value drop markedly.88.08%
W. Frei AG Klingnau scores 92.3 out of 100 points in the Substance area of the ranQ Trust Score. This area carries 28% of the weighting.
x
CriterionValueWeight
  • Establishment: Years since founding or brand launch, logarithmic. The maximum is reached at 15 years.100.012%
  • Company size: The headcount band, researched by ranQ or stated by the company. It is scored in steps rather than by head count, because the data only provides bands.82.07%
W. Frei AG Klingnau scores 86.7 out of 100 points in the Identity area of the ranQ Trust Score. This area carries 22% of the weighting.
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CriterionValueWeight
  • Verification: Official register entry (commercial register with UID or professional-body record, 55 points), confirmed domain (20 points) and confirmed ranQ profile (up to 25 points, depending on completeness).86.722%
W. Frei AG Klingnau scores 20.0 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
x
CriterionValueWeight
  • Website authority: Ahrefs' Domain Rating measures, on a scale of 0 to 100, how strongly a website is linked from other websites. For Swiss SMEs the range up to 40 is typical; the maximum is reached at 35.20.04%
  • Media authority: Quality and number of editorial mentions, weighted by the importance of the source, plus the recency of the latest high-quality mention.20.04%
Qualifications+0.00

W. Frei AG Klingnau reaches a ranQ Trust Score of 4.2 out of 5.0 — rated «Very high». The rating draws, among other things, on 4.9 out of 5 stars from 9 customer reviews. As of October 2026.

The Trust Score cannot be bought and is calculated from publicly verifiable data.

Reviews

Aggregated rating

Aggregated rating
4.9
of 5

Aggregated from 9 reviews across all connected sources

Sources
GGoogle4.99
★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

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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
Legal form: Graded by liability and disclosure. The weight is kept small: a sole proprietorship is not a dubious company, it is just liable differently.
100.0
6%
  • Branch offices: Branch offices linked in the commercial register. Having none is normal and costs no points.70.03%
    • Full methodology

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