Individual Wastewater Treatment (IBA) 

In most places in the Netherlands, wastewater is transported via sewers to a central location where it is treated. In some places, installing sewers is difficult or very expensive. In these places, small wastewater treatment plants (IBA's) are installed. These treat the water and discharge it into surface water or into the ground. An IBA is an Individual Wastewater Treatment Plant, also known as a mini treatment plant. Do you use an IBA? You can find more information here.

A healthy living environment

Clean water is important for a healthy living environment. As a water board, we work hard to ensure cleaner and healthier water, but we cannot do it alone. We need your help! When you use an IBA on a daily basis, you have a significant impact on the operation of the mini-treatment plant without even realizing it. It is therefore important to know how to use the installation, who is responsible for what, what you can do in the event of a malfunction, and how maintenance is arranged.

What does a mini purification system do?

An IBA purifies your wastewater and discharges it into surface water. The installation is tailored to your volume and type of wastewater. 

Who maintains my IBA?

You are responsible for maintenance. To ensure that the system works properly, maintenance must be performed on the mini purification system at least once a year. 

Why do I need to maintain my IBA?

Proper use of your IBA reduces the risk of blockages and malfunctions. It prevents unpleasant odors in your garden and diseases caused by coliform bacteria. It also helps to keep our water clean. This is important for nature and the quality of surface water. 

What should I do about odor nuisance from the mini purification system?

During the first 3 to 4 weeks, some odor may be released through the vent. This is normal and means that the system is working properly. If you still smell an odor after 4 weeks, please contact the service department.

What should I do about unpleasant odors coming from the sewer system in and around my home?

Odors can arise due to a failure to make adjustments to the house connection. Check whether all drainage points are equipped with an odor trap, such as a siphon or water seal. Also ensure that the house connection is properly vented and aerated.

What is my own responsibility?

Blockages between your property and the mini treatment plant are your responsibility. When unblocking, solid waste particles can enter the mini treatment plant and cause blockages. Prevent this by collecting the waste and disposing of it in the household waste container. 

When should I call the repair service?

Malfunctions can have various causes. Click on the button below to see what you can possibly fix yourself and when you should call the repair service. 

Malfunction IBA individual wastewater treatment

Tips for maintaining your IBA

Do you have a mini purification system and want to maintain it better? Then follow these six steps to help you do so. Download the flyer and hang it in a convenient place in your home. 

Tips IBA: Contribute to cleaner wastewater.pdf

Division of responsibilities for sewage and wastewater

The water board determines how domestic wastewater should be handled. We supervise the discharge of water into surface water. The municipality is responsible for constructing and managing the sewer system. As a resident (household), you must ensure that you are connected to the sewer system or a septic tank. Alternatively, you must have another facility for the individual treatment of your wastewater.

Decision on discharge of household wastewater

The decision on the discharge of domestic wastewater sets out rules for the discharge of domestic wastewater into surface water. This includes toilet water and dishwater. Specific regulations apply depending on the situation (sewerage planned or not, new or existing home). The regulations for the discharge of domestic wastewater from private individuals can be found in our Water Board Regulations, under Appendix 5.

More information