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Septic Tank Emptying: Tanks, Treatment Units and Cesspits
In short: In many Belgian villages, homes are not connected to a sewer and depend on a septic tank or a small treatment unit. Service Technic Belgium empties and cleans them, checks the pipes and filters, and leaves you a dated record of the work. Call 0477 03 88 98.
A septic tank works only if the sludge is removed before it reaches the outlet. Emptied in time, it lasts for decades; left too long, it blocks the drains and the soakaway behind it.
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Septic tankPumped and rinsed
Treatment unitSludge and filters
Grease trapKitchens and restaurants
RecordDate and volume
Who has a septic tank in Belgium
Wherever the main sewer does not reach, mostly in the countryside of Wallonia and in parts of Flanders, houses treat their own waste water. Older homes have a septic tank followed by a soakaway; newer ones often have a small treatment unit.
The rules on emptying and treatment depend on the region and on the zoning of your street. Your municipality can tell you which applies.
In towns, old tanks sometimes remain under gardens even after connection to the sewer, and can cause smells or blockages.
How emptying is done
The technician opens the inspection covers, checks the levels and the state of the inlet and outlet, then a vacuum tanker pumps the sludge, the floating crust and the liquid.
The tank is rinsed and refilled with some clean water so that it starts working again quickly. The sludge goes to a treatment plant, never into a sewer or a ditch.
For a treatment unit, he also cleans the filters and checks that the pump and aerator, if any, are running.
How often
As a guide, a septic tank needs emptying every three to four years, depending on its size and the number of people in the house. A treatment unit often needs its sludge removed more often; the maker's manual gives the interval.
Signs that it is time: slow-draining toilets, a smell near the covers, water standing above the soakaway, or a crust that reaches the outlet pipe.
Keep the dated record of each emptying: it may be asked for when selling the house.
Grease traps and interceptors
Restaurants, canteens and food businesses have a grease trap between the kitchen and the drain. It must be emptied before it fills, otherwise grease passes into the pipe and blocks it.
Garages and car parks may have an oil interceptor. It is emptied in the same way, with suitable transport for the waste.
We agree a frequency with you that suits your activity, and can work before opening or after service.
Pipes, soakaways and repairs
A blocked inlet pipe is often the first sign of a full tank. We jet it at the same time as emptying, so that the deposits do not end up straight back in the tank.
A soakaway that no longer drains may be clogged with sludge that escaped from an overfull tank. The camera shows the state of the pipes before any digging.
If the tank is cracked or the outlet broken, you receive a quote for the repair, or for replacing the tank with a treatment unit.
Signs your tank needs emptying
Smell
Near the covers or the soakaway.
Wet ground
Standing water or very green grass over the soakaway.
High crust
The floating layer reaches the outlet.
Before we come
Uncover the lids
Clear plants, gravel or decking from the inspection covers.
Tanker access
Tell us the distance from the road; the hose reaches several tens of metres.
Your records
The date of the last emptying helps us judge what to expect.
Keep clear
Never lean over an open tank: the gases are dangerous.
From your call to the invoice
A short call
The office takes your address, which drain is affected, and books a time.
No surprises
You know the call-out cost before anyone sets off; larger jobs get a written quote.
On site
Find and explain first, then your agreement, then the work. Job sheet and invoice from Service Technic Belgium.
What our customers say
Septic tanks emptied across Belgium
We work in every province and in Brussels, with most requests coming from rural Wallonia and the Flemish countryside.
BrusselsWalloon BrabantFlemish BrabantHainautNamurLiègeLuxembourg provinceAntwerpEast FlandersWest FlandersLimburg
Frequently asked questions
How often should a septic tank be emptied?
Usually every three to four years, depending on its size and how many people live in the house. Treatment units often need it more often; check the manual.
Where does the sludge go?
It is taken by tanker to a treatment plant. It is never emptied into a sewer, ditch or field.
Do I need to be at home?
Not necessarily, if the covers are accessible and you tell us where they are. We leave the record and the invoice.
Can you empty a treatment unit?
Yes, we remove the sludge, clean the filters and check the pump or aerator.
Do you work all over Belgium?
Yes, in Wallonia, Brussels and Flanders. You are told the call-out cost before we come.
Can you also clear the soakaway?
We jet the pipes and check the soakaway with the camera; if it is clogged, you get a quote for restoring it.
How do I book?
Call 0477 03 88 98, send us a WhatsApp message or book online with the « Book an appointment » button. Tell us the municipality and what is blocked.
A septic tank to empty?
Call 0477 03 88 98: we pump the tank, check the pipes and leave you a dated record.