The Rainwater Refund Calculator
DA
No refund

Are you on a separate sewer?

With separate sewers, the rainwater is already separated from the wastewater, so the utility typically does not give a refund for disconnection. The infiltration trench can still be relevant for handling cloudbursts and paved surfaces locally.

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Prefilled from the building register (BBR) if we can find your property.

Driveway, patio and similar. Optional.

Frequently asked questions

Can I still build an infiltration trench?

Yes. An infiltration trench that drains on your own plot is often allowed with a notification to the municipality – also on properties with separate sewers.

Does the utility credit infiltration trenches on separate sewers?

Usually not, because the rainwater volume is already separated. Check your utility – some places give a discount on connection fees for special solutions.

When does an infiltration trench still make sense?

If your plot floods during cloudbursts, or your paving slopes towards the house, a trench can prevent damage to the connection – regardless of the refund.