DIN 4261-5:2012-10

Small sewage treatment plants are plants for cleaning of waste water with a rated value of 4 to 50 population equivalents (PT) which are used for single houses, small settlements, restaurants or shelters if wastewater disposal by connection to large municipal sewage plants is not possible due to technical, statutory or financial reasons. This standard serves as a support for building owners, designers, manufacturers and responsible supervisory authorities for the infiltration of aerobic biologically treated domestic wastewater from small sewage treatment plants for up to 50 population equivalents. Plants according to this standard do not present an independent treatment process. The committee responsible for this standard is NA 119-05-04 AA "Kleinkläranlagen" ("Small sewage treatment plants") at DIN.