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УкраїнськаDomestic sewage treatment plant: price with installation in 2026 and types
indekscen.pl editorial team · published 30 September 2026 · prices according to the 5 October 2026 index
A domestic sewage treatment plant with a biological filter and installation most often costs 15 PLN thousand (typically 14 ‑ 16 PLN thousand), according to price lists collected by indekscen.pl. The cheapest drainage treatment plant costs around PLN 5,500 without installation, one with a bioreactor costs PLN 14,500, and installation alone costs around PLN 6,500.
At a glance (as at 5 October 2026)
- A domestic sewage treatment plant with installation usually costs 14 ‑ 16 PLN thousand, while the median from price lists is 15 PLN thousand.
- The cheapest drainage treatment plant costs around PLN 5,500 without installation, while a treatment plant with a bioreactor costs around PLN 14,500.
- Installation of a domestic sewage treatment plant, priced separately, costs around PLN 6,500, while the design costs around PLN 550.
- Sludge removal from a domestic sewage treatment plant costs around PLN 200 and is usually needed only once or twice a year.
- A septic tank emptied every month costs around PLN 2,900 a year, so a treatment plant costs more initially but less to run.
A domestic sewage treatment plant is an expense that is easy to miscalculate: some quotes cover only the treatment plant, others include installation, while others exclude the design and formalities. We break down the cost based on price lists from manufacturers and installation companies, explain the differences between types and compare a treatment plant with a septic tank over several years.
How much does a domestic sewage treatment plant with installation cost?
A domestic sewage treatment plant with a biological filter and installation most often costs 15 PLN thousand, while half of the price lists fall within the 14 ‑ 16 PLN thousand range. The median is based on 4 sources collected by indekscen.pl. The cheapest complete systems start at 6 PLN thousand, while the most expensive installations in difficult ground conditions reach 25 PLN thousand.
Here is how the individual items are priced when a company quotes them separately:
| Domestic sewage treatment plant: option | Median | Typically | Sources |
|---|---|---|---|
| Basic service | 15 PLN thousand | 14 ‑ 16 PLN thousand | 4 |
| drainage system (the cheapest option, treatment plant only) | PLN 5,500 | PLN 5,500 | 1 |
| with a bioreactor (treatment plant only) | PLN 14,500 | PLN 14,500 | 1 |
| installation labour (separate) | PLN 6,500 | PLN 6,500 | 1 |
| sewage treatment plant design | PLN 550 | PLN 550 | 1 |
| sludge removal (operating cost) | PLN 200 | PLN 200 | 1 |
Median and typical range from public price lists, as at 5 October 2026. Each price includes a source and quotation on the service page.
Details and sources for all prices are available at domestic sewage treatment plant.
Drainage, biological or bioreactor treatment plant: which should you choose?
A drainage treatment plant is the cheapest option, at around PLN 5,500 for the plant alone, but it requires permeable soil, a large plot and a low groundwater level. A treatment plant with a biological filter and one with a bioreactor cost more, but take up less space and treat sewage more effectively.
| Type of treatment plant | Price | Suitable for |
|---|---|---|
| Drainage (settling tank and soakaway) | around PLN 5,500 without installation | large plot, sandy soil, low groundwater level |
| With a biological filter and installation | 14 ‑ 16 PLN thousand | most detached houses |
| With a bioreactor | around PLN 14,500 without installation | small plot, clay soil, high groundwater level |
How a domestic sewage treatment plant works: in the first tank, the settling tank, the sewage separates into layers and the heavier solids sink to the bottom. The pre-treated water then flows into a ground drainage system or biological chamber, where bacteria break down pollutants. A treatment plant with a bioreactor uses a blower to aerate the sewage, so it works faster but requires electricity.
How much does a domestic sewage treatment plant for 4 people cost?
A domestic sewage treatment plant for 4 people is most commonly a complete system with a biological filter, costing 14 ‑ 16 PLN thousand including installation. A family of four usually uses around half a cubic metre of water a day, so a standard treatment plant designed by manufacturers for four to six people is sufficient. A larger tank costs more, but provides spare capacity for guests and requires less frequent sludge removal.
Factors that increase the total price:
- Type of soil. Clay and a high groundwater level rule out a standard drainage system and require a more expensive type.
- Tank size matched to the number of residents.
- Difficult installation: a long pipe from the house, heavy equipment on a confined plot or the need for a pump.
- Manufacturer and region, and whether the design is included in the price.
Septic tank or domestic sewage treatment plant: which is cheaper after several years?
A septic tank is cheaper to install, but a domestic sewage treatment plant costs less to run because sludge is removed once or twice a year rather than every few weeks. The median cost of one septic tank emptying is PLN 240, so a family having it emptied once a month pays around PLN 2,900 a year, typically PLN 2,600 ‑ 3,800.
| Item | Septic tank | Domestic sewage treatment plant |
|---|---|---|
| One emptying | PLN 240 | around PLN 200 |
| Number of collections per year | usually 12 or more | usually 1 to 2 |
| Collections over 5 years (once a month) | around PLN 14,000 | several collections |
| Other costs | none | bacterial treatments, electricity for a bioreactor |
After several years, the savings on collections can cover a large part of the treatment plant’s higher purchase price. We calculate this in more detail in the article emptying a 10 m3 septic tank: price and annual cost.
How much does it cost to empty a domestic sewage treatment plant?
Emptying a domestic sewage treatment plant, meaning removing sludge from the settling tank, costs around PLN 200 per collection. This is carried out by a waste disposal company licensed by the municipality, just as with a septic tank, and the receipt must also be retained. Running costs also include bacterial treatments and, for aerated systems, electricity for the blower and periodic servicing.
When is a domestic sewage treatment plant not permitted?
You cannot install a domestic sewage treatment plant where ground conditions, required distances or the local zoning plan do not allow it. The most common obstacles are:
- A high groundwater level or impermeable clay, which rule out a drainage soakaway system (a treatment plant discharging water in another way remains an option).
- A plot that is too small. Technical regulations require minimum distances from wells, plot boundaries and buildings, while a drainage soakaway must be at least 30 m from a drinking-water well.
- Access to the sewer network. If a sewer network runs beside the plot, the municipality usually requires the property to be connected.
- Local zoning plan provisions that prohibit individual treatment plants in some areas.
If your home’s water comes from a private well, plan both projects together to maintain the required distances. We cover well costs in the article deep well: total cost, while the median drilling price is 250 PLN/linear metre.
What formalities and funding apply to a domestic sewage treatment plant?
Building a domestic sewage treatment plant with a capacity of up to 7,5 m³ per day requires notification to the county office, rather than planning permission. Before commissioning, you must also notify the municipal office that the treatment plant will be operated. The notification requires a design, which costs around PLN 550, and a map showing the location of the tanks.
Many municipalities offer funding for domestic sewage treatment plants through their own schemes. The rules vary between municipalities: applications usually need to be submitted before purchase and installation, and the grant covers part of the cost. Ask your municipal office before signing a contract with an installer. A designer or official can assist with the detailed formalities.
How long does it take to install a domestic sewage treatment plant?
Installing a domestic sewage treatment plant usually takes from one to two days: the team excavates the site, places the tanks, and lays the pipes from the house and the drainage system or outlet. It takes longer in ground with a high water level, where the water must be pumped out, and where a long pipeline is needed. The entire process, including the design and notification to the county office, can take from several weeks to two months because the authority has time to raise an objection. It is best to install the treatment plant before laying paving and creating the lawn to avoid damaging the finished garden.
How can you avoid overpaying for a domestic sewage treatment plant?
- Compare complete systems with installation. The price of the treatment plant alone means little if installation costs around PLN 6,500.
- Have the soil tested before choosing a type. An unsuitable drainage treatment plant installed in clay will stop working after a few seasons.
- Ask about the design and formalities. Some companies include the design and notification in the price.
- Check the running costs. Electricity, treatments and servicing over 10 years add up to a significant amount.
- Ask about the warranty for the tank and blower and about servicing in your area.
„Przydomowa oczyszczalnia ścieków z montażem kosztuje od 6,5 do około 12 tys. zł.”
MG Projekt, source
„W tym przypadku ceny mieszczą się w przedziale 9000 – 22 000 złotych, co wynika między innymi z bardziej skomplikowanej budowy systemu, na którą składa się osadnik wstępny i złoże biologiczne.”
biopolis.pl, 2026-09, source
„Cena przydomowej oczyszczalni ścieków razem z montażem zwykle mieści się w przedziale od 10 000 do 25 000 zł.”
agromar.slask.pl, 2026, source
„W standardowych warunkach gruntowych większość inwestycji zamyka się w przedziale 12 000–18 000 zł.”
Traidenis-Pol, 2026, source
More construction-related prices are available in the house construction category and the article cost of building a house.
The prices in this article come from public price lists published by manufacturers and installation companies, as well as construction articles. Each price on the service page includes its source, date and a verbatim quotation.
Frequently asked questions
How much does it cost to empty a domestic sewage treatment plant?
Wywóz osadu z przydomowej oczyszczalni kosztuje około PLN 200 za jeden kurs. To zwykle ta sama firma asenizacyjna, która opróżnia szamba, gdzie mediana za wywóz to PLN 240.
How often does a domestic sewage treatment plant need emptying?
Osadnik przydomowej oczyszczalni opróżnia się zwykle raz lub dwa razy w roku, zależnie od liczby domowników i pojemności zbiornika. Dokładną częstotliwość podaje producent w instrukcji eksploatacji.
How much funding is available for a domestic sewage treatment plant?
Dofinansowanie do przydomowej oczyszczalni zależy od gminy i programu, a w wielu gminach pokrywa część kosztu zakupu i montażu. Wysokość i zasady sprawdź w urzędzie gminy przed zakupem, bo zwykle trzeba złożyć wniosek przed rozpoczęciem prac.
How much does a domestic sewage treatment plant design cost?
Projekt przydomowej oczyszczalni kosztuje około PLN 550, a część firm wlicza go w cenę kompletu z montażem.
Does a domestic sewage treatment plant require electricity?
Oczyszczalnia drenażowa zwykle działa bez prądu, natomiast oczyszczalnie z bioreaktorem i aktywnym napowietrzaniem potrzebują zasilania dmuchawy. To dodatkowy, stały koszt eksploatacji, o który warto zapytać producenta.
Check prices with sources
Every amount quoted in the article has a source, date and verbatim quote from the price list on the service page.
Translation of the original Polish article dated 30 September 2026. Quotations from price lists are in Polish, as published by the companies. Read the original in Polish.
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