Hailuoto waste water is currently discharged through a transfer drain to Lakeuden Keskuspuhdistamo, a water treatment plant, in Kempele.
The transfer drain runs through the island for about 30 kilometres and continues under water from the island to mainland for a distance of approximately 9 kilometres and is then connected to Oulunsalo waste water disposal system. In the Hailuoto side of the transfer drain, there are 12 line pumping stations. The system was built in 2006 after which almost 430 properties have been connected to it.
Approximately 33,000m3 of water is annually discharged to the mainland for treatment. The amount is on the rise as an increasing number of households are being connected to the system. More than 50 per cent of households have connected to the waste-water drainage system.
Property-specific drainage and sewerage pressure technology
Hailuoto waste water disposal system was implemented by using pressure drainage technology. The technology allows for flexible and economical connection to the waste water disposal system.
Pressure drainage technology is a competitive option compared to property-specific systems and will help to reduce property waste water in compliance with the Waste Water Regulation requirements.
In areas with drainage systems, households have an obligation to connect to the waste water disposal system. In other areas, property-owners may choose between property-specific waste water treatment and connection to the general waste water disposal system.
Property-specific waste water treatment
Primarily properties should be connected to the general waste water disposal system. Property-specific waste water treatment always requires an operation permit by the Housing Control Department.