45232421 - Sewage treatment works

CPV code 45232421 in the EU Common Procurement Vocabulary refers to Sewage treatment works. It sits at level 6 of the CPV hierarchy as a subcategory within the 45 division. This code is nested directly under 45232400, narrowing the broader category into the specific area of sewage treatment works. As a leaf code, 45232421 has no further subdivisions and represents the most precise classification available in this branch — buyers should reference it directly in tender notices when the procurement primarily concerns sewage treatment works. Contracting authorities across the EU use 45232421 in TED notices and national procurement portals to signal that a tender relates to sewage treatment works.