Thanks, Ranger...I have to curl up by a fire and get in some quality linkage reading.
Please clarify some thoughts you have provided. When you say "surface discharging septic systems", are you talking about a conventional closed field or a mechanical system that discharges a stream of biologically clean effluent? Then, when you say approx 150K total units in Illinois, that doesn't seem like alot, comparatively. This leads me to believe you mean the latter noted in previous question.