Article R1331-2 of the French Public Health Code
It is forbidden to introduce into wastewater collection systems: a) Directly or through pipes in buildings, any solid, liquid or gaseous matter likely to be the cause either of a danger to operating staff or to the residents of buildings connected to the collection system, or of damage to sewerage and treatment works, or of a hindrance to their operation; b) Solid waste, including shredded waste; c) Spring water or…