Obtain a permit for a rainwater harvesting system
Permit or notification for a rainwater harvesting system (cistern) with the local water authority.
How to proceed
- 1
Report the facility to the Lower Water Authority
In most states, a notification is sufficient; no permit is required.
- 2
Check technical requirements
Separation of drinking water, backflow prevention, and pipe labeling.
- 3
Operation of the system
Upon receipt of the report and, if necessary, confirmation from the authorities.
Responsible authority
The authority of your main place of residence is responsible.Find authority →
Fees
Varies by case
Processing time
approx. 2 weeks
Official: max. approx. 4 weeks
Online application
In person or by post
Common mistakes
- • System commissioned without a display
- • No backflow prevention
Common reasons for rejection
- • Lack of separation between the drinking water and stormwater systems
You can usually file an objection against a rejection.
The essentials before applying
Who is eligible?
Homeowners who want to use rainwater for flushing toilets, watering their gardens, or running their washing machines.
Income limit
The limit varies by household and region – see the table at the responsible authority or in the application assistant.
Processing time
Nationwide: approx. approx. 2 weeks
Success rate
approx. 90.0 % (estimate)
Most common mistakes
- •System commissioned without a display
- •No backflow prevention
Common reasons for rejection
- •Lack of separation between the drinking water and stormwater systems
Alternatives
- Check related services in the application assistant
- Use social counselling before applying
If rejected
File a written objection within 30 days – with reasons why the decision is wrong and any missing evidence.