Pool water might be harmful to aquatic life – this is how to dispose of chemical-laden water properly
Many households use swimming pools, hot tubs and whirlpool baths for recreation in their yards. We would like to remind residents that draining these should always be done responsibly and in accordance with environmental regulations. Pool and hot tub water often contains chemicals, such as chlorine, which can be harmful to natural waters and the environment.
How to drain your pool or hot tub properly
Drain the water primarily into the municipal wastewater sewer. Make sure the draining process does not cause flooding or damage to streets, neighbouring properties, or building structures.
In sparsely populated areas, the water can be removed using a vacuum truck and taken to a municipal wastewater treatment plant. If your property has a small private treatment system, be aware that large volumes of chemically treated water (e.g. with chlorine) can disrupt biological wastewater treatment.
If the water cannot be drained into a municipal wastewater sewer and the property conditions and water quality allow, the water may be released into the soil, but only in a controlled manner. Before draining, let the water sit without added chemicals for at least one week. However, if your property is in a groundwater area, do not release the water into the soil, as it may risk contaminating groundwater.
Never drain the water directly into a natural body of water (such as a lake), a ditch, or a stormwater sewer. Discharging chemically treated water into natural waters is prohibited under section 7 of the Environmental Protection Act. By following these guidelines, you help protect our waterways and shared environment.
Thank you for acting responsibly and in line with the law.
Environmental protection bulletin from the City of Espoo 1.8.2025