On-site sewage and private well
Rural cabins often have their own water and sewage. Here's what you need to know about legal requirements, responsibilities and practical upkeep.
What is on-site sewage?
An on-site sewage system belongs to the property itself and is not connected to municipal sewage. It is common in the countryside and for cabins. It handles household waste water and can be built in different ways depending on soil, water protection and usage.
What is a private well?
A private well is a water source that supplies the property with drinking water. It can be dug, drilled or a spring. As the owner you are responsible for water quality and proper upkeep of the well.
Common on-site sewage types
- Closed tank: collects all waste water, emptied by a vacuum truck.
- Three-chamber septic tank: the most common separator for properties without municipal sewage. It treats waste water in three stages by letting solids settle before the water flows on to an infiltration bed or soil filter.
- Soil filter bed: cleans waste water through layers of soil and vegetation.
- Infiltration: water is released into the ground via a bed or pressure distributor.
- Mini treatment plant: a more technical solution that treats water before release.
What does the law say?
The municipality oversees on-site sewage and can require inadequate systems to be upgraded. At sale both seller and buyer should know the condition. Under Sweden's Environmental Code the system must be approved and must not harm health or the environment.
Check before buying
- Ask for documentation on the sewage system's type, age and any inspections.
- Ask the municipality if there are requirements or pending cases for the property.
- Check drinking-water quality from the well with a water test.
- Verify the distance between the water source and the sewage system.
Who is responsible for what?
The owner is responsible for the sewage and well working and meeting requirements. At sale the seller should provide correct information. The buyer should verify condition and budget for future maintenance and renovation.
Common issues
- Bad smell or standing water above the infiltration.
- Low well flow or contaminated water.
- Old systems that no longer meet current environmental rules.
- Incorrect distance between sewage and drinking-water source.
Good to know
Rules and recommendations vary between municipalities. Always contact the municipality where the cabin is located for the current requirements when buying, owning or rebuilding. If the seller discloses that something doesn't meet requirements — e.g. that the municipality has condemned the sewage system and it must be replaced within a certain time — the seller is not required to fix it before the sale, but must disclose it so you can include it in your budget.