German standard methods for the examination of water, waste water and sludge; bio-assays (group L); surfactant biodegradation and elimination test for simulation of municipal waste water treatment plants (L 26)
Edition 1994-05

German standard methods for the examination of water, waste water and sludge; sludge and sediments (group S); detection of salmonellae in disinfected sewage sludge (S 13)
Edition 1992-03

Wastewater treatment plants - Part 1: General construction principles; German and English version prEN 12255-1:2023
Edition 2023-08

Wastewater treatment plants - Part 1: General construction principles; German version EN 12255-1:2002
Edition 2002-04

Wastewater treatment plants - Part 2: Storm water management systems; German and English version prEN 12255-2:2024
Edition 2024-08

Wastewater treatment plants - Part 3: Preliminary treatment; German and English version prEN 12255-3:2021
Edition 2022-01

Wastewater treatment plants - Part 3: Preliminary treatment (includes corrigendum AC:2000); German version EN 12255-3:2000 + AC:2000)
Edition 2001-03

Wastewater treatment plants - Part 4: Primary treatment; German and English version prEN 12255-4:2021
Edition 2021-09

Wastewater treatment plants - Part 4: Primary settlement; German version EN 12255-4:2002
Edition 2002-04

Wastewater treatment plants - Part 5: Lagooning processes; German and English version prEN 12255-5:2022
Edition 2022-03