Maintenance of IBA systems

From January 1, 2005, the direct discharge of domestic wastewater into surface water and soil has no longer been permitted. In connection with this, Waterschap Aa en Maas entered into cooperation agreements with 7 municipalities at the time for the remediation of wastewater discharges in rural areas. Based on these cooperation agreements, approximately 150 IBAs were installed in the water board's management area between 2004 and 2006. Currently, the water board still has a cooperation agreement with 6 municipalities. These 6 municipalities own all IBAs present in the management area, with the exception of one IBA system owned by Waterschap Aa en Maas. Based on the cooperation agreements, the water board is responsible for the management, maintenance, and replacement of parts of the IBAs. In the period 2005-2025, various IBAs have been removed and a few have been added in the area of Waterschap Aa en Maas. The current status is that 110 IBAs are under management and maintenance. Most IBAs are approximately 20 years old. The current contract for the maintenance of the IBA systems expires on February 28, 2026. These systems must remain in good condition in the coming years. To ensure this, the water board intends to tender a framework agreement for the maintenance of the IBAs. This agreement will be concluded with one contractor and will commence no later than March 1, 2026. The following activities are within the scope of the framework agreement, but are not exhaustive: - Inspecting and preventively maintaining the IBAs twice a year; - Emptying (pumping out) the IBAs once every 3 years; - Providing a 24/7 breakdown service 365 days a year; - Resolving all malfunctions of the installed systems; - Digitally processing the results of inspections carried out, as well as malfunctions and work performed, in a maintenance management system. All necessary materials for malfunctions and maintenance are part of the framework agreement. Emptying during or as a result of malfunctions is also part of the framework agreement. Maintenance must be carried out as described in the assessment guideline for the Kiwa process certificate for quality-driven maintenance of small wastewater treatment plants for domestic wastewater (BRL-K14035). See the tender documents for more information on the activities.