John,
Since you live in a rural area do you have a stream on your property? Water wouldn't be as clean as a well and you would have to shock it to get rid of critter doodoo etc but the TA would probably be a low lower. 800...wow. I have two wells and a stream and when fill is needed I use the stream. Also, any way to cat rain water from roof gutters, if you have them, and use that for fill? Just a couple thoughts.
Al