Why do you pay a charge for wastewater treatment?
Is your commercial property connected to the sewer system, or do you rent out rooms? If so, you pay a commercial property water purification charge. The charge enables Water Boards to treat wastewater from your commercial property, so that the clean water can be safely returned to the environment.
How much is the water purification charge?
To determine your assessment amount, we look at the number of pollution units. A pollution unit is a measure of how polluted the wastewater is. For your business, you pay:
- 1 pollution unit for water consumption up to 44 cubic meters.
- 3 pollution units for water consumption ranging from 44 to 218 cubic meters.
- 5 or more pollution units for water consumption of 218 cubic meters or more. We take into account the type of business you operate and the type of pollution entering the water.
Sometimes we need additional information to determine the tax assessment. In that case, you will receive an invitation to file a digital tax return.
Preliminary and final assessment
Have you received a preliminary assessment for the water pollution charge of purification charge? That’s possible. At the end of the year, you will receive a final assessment based on the actual data for that year.
New Waterschapswet effective January 1, 2026
Effective January 1, 2026, a new tax system will be implemented under the Waterschapswet. This change to the tax law ensures that the burden is distributed more equitably and aligns well with current practices. This will enable us to continue covering the costs of water management in the future. We have summarized the most important changes below:
- Separate water system levy rates for residential and commercial properties
- Changes to the Wastewater Treatment and Pollution Surcharge for businesses
- Separate wastewater streams
Rates per Water Board
Click on your Water Board below to go to the rates page: