Rainwater cistern grant
Grants help building owners, owners associations and tenants install rainwater cisterns for garden irrigation on properties in Gräfelfing.
This entry covers rainwater cisterns used for garden irrigation under the municipal climate-adaptation programme. The grant supports the cistern, equipment that directs rainwater into it and installations needed to use the stored water. Cisterns retain rain during heavy storms and reduce water consumption.
The grant covers up to 40% of construction and material costs, subject to a maximum based on cistern volume:
| Cistern volume | Maximum grant |
|---|---|
| 0.5–1.99 m³ | €1,200 |
| 2–2.99 m³ | €1,300 |
| 3–3.99 m³ | €1,400 |
| 4–4.99 m³ | €1,500 |
| 5–5.99 m³ | €1,600 |
| 6–6.99 m³ | €1,700 |
| 7–7.99 m³ | €1,800 |
| 8–8.99 m³ | €1,900 |
| 9 m³ or more | €2,000 |
Payment follows completion and the municipality's check of detailed final invoices. The programme is voluntary, with no entitlement to funding. Its 2026 budget is €15,000, and applications are considered only while money remains.
Eligibility
- The property must be in Gräfelfing. Building owners, owners associations and tenants can apply. Tenants must attach the owner's consent to the application.
- Only one cistern can receive support per property. Across the programme, the maximum funding per applicant is €5,000.
- Apply with a complete application before ordering, signing a purchase contract or starting work. This entry follows the route of waiting for approval before those steps. Planning, obtaining quotations, applying for or obtaining building permission, soil investigations and land purchase do not count as starting the measure.
- Comply with any technical conditions the municipality sets during assessment. It may inspect the project during the application process or after completion, and you must grant its representatives access when requested.
- Complete the work within one year after receiving approval. After installation, label rainwater outlets “Kein Trinkwasser!” (not drinking water). Inform Würmtal Zweckverband that the rainwater will be used for garden irrigation.
- Provide correct, complete information and documents, and immediately notify the municipality of changes affecting funding. It may deduct €70 from the grant for repeated processing, for example after change requests or missed agreed dates. The municipality accepts no liability for building damage after construction or alterations.
How to apply
- Status
- closes 31 Dec 2026
- Opens
- Closes
- Round restrictions
- Complete applications are accepted during 2026 while funds remain; the programme budget is €15,000 and there is no entitlement to funding.[^c3][^c7]
- The current energy-funding stop does not affect other municipal programmes; the rainwater application remains available.[^c11][^c13]
Apply through the municipality's online rainwater application. Include a quotation stating the cistern volume, a description of the planned measure and its cost. Private applicants need a BundID or BayernID account. You can also apply for an organization using a personal account and indicate that you act for the organization. You must also consent to the municipality keeping your application data for grant approval and checks. The form requires consent to personal-data processing and asks for consent to electronic delivery of correspondence and notices through your user account.
Submit the complete application and wait for the municipality's approval before ordering or starting work. If information is missing, the current administrator instructions allow three months to provide it, but incomplete applications may be returned without further processing. Meet any technical conditions in the approval.
After completing the work, submit detailed final invoices showing the work performed. The current municipal page provides an online upload form for final invoices and required proof; the 2026 rules also instruct sending the invoices by email to the municipality. Payment is transferred after the municipality checks proper completion. Contact the environmental team at umwelt@graefelfing.bayern.de or 089 / 8582-1067 for application support. Notify Würmtal Zweckverband about garden irrigation at info@wuermtal-zv.de or 089 / 85708-0.