thats insane. why? people with septic tanks aren't on the sewer. why should they pay the fee? if you are on septic you pay if anything goes wrong. redoing a leach field or a septic tank can be expensive!
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I have an alternate theory hypothesis somewhat based with my experiences cave exploring in Kentucky. As Alabama is another state largely under laid by Karst topography.
A huge problem not really comparable to those states North of the "Mason Dixon" line where soils are underlain by hundreds of feet of impermeable glacial till.
Then we have to face the facts, human beings generate poisons easily just flushed down the toilet. As we just whoopie, flush our toilet, and poof our shit just goes away, out of sight and out of mind. Nor is it that simple, we are talking farm chemicals, landfills where our garbage is collected and dumped, as that too just goes poof away.
Then we have to realize that momma nature has an asset, given time and slow groundwater movement, years of time and slow groundwater movement can breakdown and detoxify most chemical we just dump into the ground. As many Northern States measure their groundwater movement in increments of less than a dozen feet a year.
But go to Kentucky, in prime Karst topography, research has shown that groundwater can move miles per day. As it become not hard to understand why many Kentucky residents suffer from the highest cancer rates in the nation. Of course many swear, my great grand daddy has been drinking from that spring with no ill effects for 200 years.
Why should Alabama be different be radically different? Its more expensive to purify water in such locations, and septic tank owners just add to the problem. And even if we don't charge septic tank owners for their bit of the problem, they have their own wells as they pump groundwater and swill the same carcinogens as everyone else.
Add in corruption and human stupidity and we have a perfect storm.