Allanton Wastewater Funding

I believe that current residents only paying 20 % of the Capital cost of the Wastewater Systems is far too generous and this will be a very expensive precedent.
In theory, current residents will pay 20% of their share of the capital cost, and future developers will pay 100%. But the Council will finance the share for the undeveloped sections in the meantime.
As few sections will be developed in the foreseeable future, the Council will end up paying for 80% of the current residents share plus almost all of the share for the undeveloped sections. For Allanton, this will be about 93% of the capital cost.
I cannot see any logical reason why current residents should be treated any differently than future residents. If there are public health issues, then they are caused by pollution by current residents. Whatever happened to polluter pays?
If this precedent is followed for future projects of this type, the cost to the Council will be many millions of dollars.