I would like any information on the cheapest alternative septic system. My mother owns property which is only worth $15,000, but it doesn't perk and the soil scientist gave her an estimate of $12,000 to $15,000 to put in an alternative system. She is getting up in age and will never use the property, but can't sell without an alternative system. In addition, she is paying over $600 annually for Association Fees for property she will never use or need. Please help.