When would a grandfather clause regarding a septic system apply?

Question Details:

I have a rural home on 4 acres bought 17 years ago. I'm now being forced to hook onto sewer district. I did have a legal septic system until a "district" was organized. I've received 2 bills (haven't paid them) and now they're threatening me with shutting off my water and putting a lien against my home. I was informed that if "their" line ran within 100' of my property, I had to hook up. Just so happens their closest connection is about 20' way from my NE corner, and my house (septic in front yard) faces south in the SW corner. At $10/ft (plus $500 hook up fee) it will be a huge cost to me when I have a perfect working system already. Is there anything I can do to fight this?

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