Overview
Biosow has worked in wastewater treatment since 1996, designing, building and commissioning industrial wastewater treatment plants, as well as modernizing and repairing municipal plants. It also supplies equipment for sludge dewatering and hygienization and provides technical consulting and service for meat, fruit and vegetable, paper, textile and other industries.
Financials
Revenue history (in k)
Filing timeliness
Financial statements were filed on time, on average 34 days early.
- 202501/07/2026
- 202428/05/2025
- 202305/06/2024
- 202213/06/2023
Data and insights are generated automatically from financial statements – they may contain errors and are neither a credit assessment nor business advice.
Statistics
How the company ranks by revenue within its industry, region and across Poland in 2025.
Results vs industry
Industry
Offer
- Industrial wastewater treatment plants
- Wastewater pretreatment plants
- Municipal wastewater treatment plants
- Sludge dewatering equipment
- Sludge hygienization equipment
- Treatment plant design
- Treatment plant installation
Website technology
- Website
- WordPress
Public procurement
3 tenders recorded as contractor, with a total value of $1,919,368.
| Publication date | Subject | Amount | Contracting authority | |
|---|---|---|---|---|
| May 18, 2026 | Expansion of the wastewater treatment plant in Gmina Nowa Brzeźnica | $166.9K$166,924 | Gmina Nowa Brzeźnica | |
| Apr 20, 2026 | Renovation of the wastewater treatment plant, parts of the sewer system and soakaways at JW. Niedźwiedź | $368.8K$368,801 | Rejonowy Zarząd Infrastruktury w Krakowie | |
| Oct 12, 2023 | Expansion of the wastewater treatment plant in Rudlice | $1.4M$1,383,644 | Gmina Ostrówek |
Authorized Representatives
Manner of representation
Each member of the management board is authorised to represent the company and to make declarations of will on its behalf independently.
Ownership
| Owner | Shares | Share value | Stake |
|---|---|---|---|
Katarzyna Małgorzata Kostrzewaage 55 | 1,000 | $13,506.21 | 50% |
Robert Stanisław Kostrzewaage 58 | 1,000 | $13,506.21 | 50% |
Katarzyna Małgorzata Kostrzewa and Robert Stanisław Kostrzewa hold a combined 100% – the ownership structure indicates family control.
Beneficial owners
| Person | Rights |
|---|---|
Debt
No entries in the National Debtors Register (KRZ).
Public aid
| Grant date | Purpose | Gross amount | Granting body | |
|---|---|---|---|---|
| Oct 8, 2025 | De minimis aid (in accordance with Commission Regulation 2023/2831) | $5,974$5,974 | Starosta Powiatu Wieluń | |
| Apr 14, 2025 | De minimis aid (in accordance with Commission Regulation 2023/2831) | $2,875$2,875 | Starosta Powiatu Wieluń |
Competitors
| Name | Revenue | Website | ||
|---|---|---|---|---|
| Bioorgsp. z o.o. | $2,495,879.96 | bioorg.pl | ||
| Techsansp. z o.o. | $2,383,223.98 | techsan.com.pl | ||
| PM Industrysp. z o.o. | $1,938,393.88 | pm-industry.pl | ||
| Inspolsp. z o.o. | $1,793,547.03 | inspol.pl | ||
| Bukoltsp. z o.o. | $1,154,632.49 | bukolt.pl | ||
| Newater Serwissp. z o.o. | $1,119,096.08 | newater.pl | ||
| OTT Systemsp. z o.o. | $1,038,761.08 | ottsystem.pl | ||
| Biokompo sp. z o.o.sp. k. | $608,259.68 | biokompo.pl | ||
| Biopolsp. z o.o. | $217,227.52 | biopol.pl | ||
| Biologicznisp. z o.o. | $214,951.68 | biologiczni.pl |
FAQ
Last updated: 2026-07-04