Precipitation water; information on permit-free infiltration

Rainwater from paved areas is to be returned to the natural water cycle as far as possible (= near-natural rainwater management).

Description

Prerequisites

For the discharge of collected precipitation water into groundwater (§ 9 para. 1 no.. 4 WHG), a permit is not required, subject to § 8, if the essential requirements are met:

  • The precipitation water is infiltrated over a suitable topsoil layer.
  • Underground infiltration systems such as infiltration trenches, seepage pipes or shafts are only permissible if surface infiltration is not possible and appropriate pre-treatment is carried out.
  • A maximum of 1,000m2 of paved area may be connected to an infiltration system.
  • Infiltration takes place outside of water and medicinal source protection areas and outside of contaminated and suspected contaminated sites.
  • The precipitation water to be infiltrated is not adversely altered or mixed with wastewater or substances hazardous to water.
  • The precipitation water to be infiltrated does not originate from areas where substances hazardous to water are regularly handled (except for small containers up to 20 liters).
  • Rainwater from uncoated copper, zinc or lead surfaces over 50m2 may only be infiltrated after the water has been pre-cleaned via a suitable topsoil layer or after pre-cleaning via a treatment plant with design approval (cf. subpage "Metal roofs").

Links to more information

Status:02.01.2023

Responsible for editing:Bayerisches Staatsministerium für Umwelt und Verbraucherschutz

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