We pump out the contents of drainage wells and inspection chambers with a vacuum tanker in Riga and the Riga region, and we check which pipe the sediment is coming from. Prices start from €75 for up to 4 m³; we clean several wells at one address in one visit.
What builds up in a drainage well and why it matters
Foundation and site drainage collects groundwater and rainwater through perforated pipes and carries it to inspection chambers and a collector well. From there, the water flows away to a ditch or the stormwater sewer, or a drainage pump pumps it out. Fine sand and silt get into the pipes along with the water, and in many parts of Latvia so does a rust-coloured, slimy layer of iron deposits.
As long as the sediment sits at the bottom of the well, it does no harm. When the layer reaches the pipe inlets or the pump level, the flow of water slows down, the pipes silt up from the inside, and water stays around the foundations. Sand also quickly wears out the drainage pump.
Signs that a drainage well needs cleaning
- There is a visible layer of sand or silt at the bottom of the well that is getting close to the pipes.
- The water in the well stands higher than usual or drains away slowly.
- The drainage pump switches on very often or switches off at the wrong time, because sediment is interfering with the float switch.
- The basement or plinth walls have become damp after heavy rain, although they never used to.
- In the first years after a house is built there is a lot of sand, so the wells need checking more often then.
How drainage well cleaning works
- Request Give the number of wells, their type (narrow plastic inspection chambers or concrete-ring wells), the approximate depth, and whether the collector well has a pump.
- Pumping The vacuum tanker's hose is lowered to the bottom of the well and the water is pumped out together with the sediment. Compacted sand is first loosened with water so that it can be pumped out.
- Inspection In an empty well you can see which pipes the sediment is coming from and whether they are intact. If there is a pump, we check that the float moves freely.
- Result We tell you what we saw: whether regular cleaning is enough, or whether the pipes need flushing or rebuilding.
If sand keeps coming
If the well fills up with sand again within a few months of cleaning, the problem is in the pipes, not in the well. There are usually three reasons: a damaged or missing geotextile filter around the pipes, a collapsed pipe, or the wrong fall, which turns the pipe itself into a settling tank. Pumping no longer solves this: the pipes have to be flushed or rebuilt. Building drainage and rainwater systems is described on the rainwater drainage installation page.
Drainage and sewage must not mix
Drainage water is not wastewater, and wastewater must not get into the drainage. The reverse is harmful too: if the drainage or the roof gutters are connected to a septic tank or holding tank, the tank overfills after every rain, and the septic tank washes sediment out onto the drain field. This is one of the most common reasons why a septic tank fills up fast.
Mārupe Municipality Binding Regulations No. 13/2023, point 15.2: discharging untreated domestic and industrial wastewater into the ground, surface waters, land drainage ditches, drainage systems and the stormwater sewer is prohibited. Other municipalities in the Riga region have similar requirements, but check your own municipality's rules. Source: likumi.lv, checked on 30 October 2026.
How often to clean
There is no single interval. It depends on the soil and on how much sand the pipes carry in. In practice: inspect the wells in spring and autumn. If the sediment is getting close to the lowest pipe, it is time to clean. Don't wait until it reaches the pipe. If there are several wells, clean them all in one visit, starting with the highest one, so that sediment from an upper well doesn't end up in one that has already been cleaned.
How much drainage well cleaning costs
The volume of water and sediment in drainage wells is usually small, so most jobs fall into the band up to 4 m³ (from €75). If the collector well is large or there are many wells, the next band applies. Outside Riga we add a travel charge of about €1 per kilometre. The price depends on the number of wells, their depth and how tightly the sand has compacted.