15.7(4)If a regional solid waste commission defaults in any payment required to be made by the regional solid waste commission, the participating municipalities, the participating rural communities, the participating unincorporated areas other than participating Indian reserves, and the band councils of the participating Indian reserves are liable for the payment in portions equivalent to the ratio that the population of the municipality, rural community, unincorporated area or Indian reserve bears to the total population of the participating municipalities, participating rural communities, participating unincorporated areas other than participating Indian reserves, and participating Indian reserves.