France is in the middle of a complete overhaul of the Waste-water Treatment scenario… and with good reason. One of the main opportunities for checking/correcting is at point-of-sale.
At the time of Purchasing: The Buyer undertakes to correct any faults (as notified and/or as may be applicable) to the waste-water treatment facilities within a certain timescale. This is part of the Sale/Purchase process and a firm commitment.
Waste-water (kitchen, bathroom, laundry etc) can contain potentially pathogenic micro-organisms, organic materials, nitrogenous matter, phosphorus etc, and can be the source of environmental pollution and significant health risks.
It is in no-one’s best interest to ignore/avoid the corrective measures needed for a property. There is far more than 20 euro at risk , I can assure you.
For existing owners (such as your neighbours)… the system may or may not conform. Depending on the severity of non-conformity, timescales can/will be discussed and works may (possibly) be delayed in the short-term… but the work will have to be done. If funds are a problem, aid is available (means-tested).
Some Owners are waiting until the last minute, until they are forced to have the work done. They run the risk of prosecution (last resort) and the very real risk of being responsible for pollution that is more costly for them to redress than the remedial work itself.
Sorry this post is a bit long, but it is an important subject… and I want folk to understand a bit of the reasoning behind these sanitation controls We’ve come a long way from those days when… the potty was emptied out of the window… but there is still a way to go…