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© 2026 cohaga AG · All Rights Reserved · St. Gallen, Switzerland · Imprint745,629 companies indexed · Last updated: today
DirectoryEnergy & EnvironmentWaste Management IndustryAarwangenZALA AG
ZALA AG Logo
Verified· 2 sourcesTrust Score
Summary

About the company

The core activity of ZALA AG is wastewater treatment. The company operates a central wastewater treatment plant (ARA) at its site in Aarwangen, the ARA Eymatte, and is responsible for wastewater treatment for 20 municipalities in the Oberaargau region.

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Products & services

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4.1/5

ZALA AG

Waste Management Industry
✓ Offered5
Wastewater treatment
Wastewater treatment for 20 municipalities in Oberaargau, operated via the central WWTP Eymatte in Aarwangen with mechanical, biological and stormwater treatment as well as sludge dewatering.
Operation of a central WWTP
Operation of the WWTP Eymatte with screening plant, sand and grease trap, aeration tanks, final clarifier tanks, stormwater treatment, sludge dewatering and odour removal.
Stormwater treatment
Stormwater treatment during heavy rainfall with stormwater basins and return of the retained wastewater for later treatment in the WWTP.
Sludge dewatering
Sludge dewatering of surplus sludge produced in the treatment process using stacking basins, centrifuges and discharge for incineration.
Odour removal
Odour removal via an exhaust air treatment system with scrubber stage and biofilter for odour-contaminated areas of the WWTP.
Trust & reputation

ranQ Trust Score of ZALA AG: 4.1 out of 5.0

Trust Score4.1/ 5.0

High

x

Data basis 54% · As of October 2026

Without public customer reviews the score stays capped.

ZALA AG has no value in the Reputation area of the ranQ Trust Score because no data is available. The area carries 42% of the weighting and drops out of the calculation for this profile; it does not lower the score, only the reported data basis.
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CriterionValueWeight
  • Review quality: No data point — the criterion is taken out of the weighting and does not lower the score.—24%
  • Review volume: No data point — the criterion is taken out of the weighting and does not lower the score.—10%
  • Review recency: No data point — the criterion is taken out of the weighting and does not lower the score.—8%
ZALA AG scores 85.5 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.55.07%
ZALA AG scores 83.3 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).83.322%
ZALA AG scores 17.1 out of 100 points in the Visibility area of the ranQ Trust Score. This area carries 8% of the weighting.
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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 35.17.14%
  • Media authority: No data point — the criterion is taken out of the weighting and does not lower the score.—4%
Qualifications+0.00

ZALA AG reaches a ranQ Trust Score of 4.1 out of 5.0 — rated «High». No public customer reviews are available for this provider; the rating is based on the remaining criteria. The data basis is 54%, so the score is backed by part of the criteria. As of October 2026.

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

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Location

Wynaustrasse 91
4912 Aarwangen

At a glance

Legal form
Corporation
UID
CHE-101.176.984
Founded
2000 · 26 years
Last commercial register change
May 5, 2023
Employees
1 to 10
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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