Sewerage and sewage treatment services

**Includes:** - sewage removal services usually provided using equipment such as waste pipes, sewers or drains - sewage treatment services using dilution, screening and filtering, sedimentation, chemical precipitation, etc.

**Excludes:** - collection or purification of water, cf. 18000 - construction, repair and alteration services of sewers and sewer pipelines, cf. 54241, 54251 - distribution of water through mains on own account, cf. 69210 - distribution of water through mains on a fee or contract basis, cf. 86330