I agree totally with what has already been suggested.
I was living in the Charente Maritime and had a neighbour who had a fosse, pas aux normes, and the effluent was killing our walnut trees.
Firstly, I contacted SPANC who came out to make an inspection (FOC), then I talked to a councillor (conveniently a friend of a friend) and he also came out. Result! The councillor wrote to the neighbour, requesting him to put in a conforming fosse.
We were in the process of selling the house and this was a bit of a sticking point but, literally at a stroke, the problem was solved and I smirked mightily as this was the original neighbour from hell!
Apprendre une langue, c'est faire un voyage différent chaque jour.
from Fle pour les curieux