I wonder if there really IS more fertilizer entering the lake than 50 years ago.The regulations of septic in the past 20 years are much more stringent.I bet there was a lot more sewage ending up in the lake back in the good old days.As far as the lawn fertilizer runoff,I would guess there were a lot more farms around the lake back then that leached lots of these components to the lake.I here a lot of complaints about the McMansion people only using their houses for a few weeks a year.Well,I would think that would put a lot less strain on that piece of property than the antiquated sewage systems that were in place there before they were torn down.I don't,but it's something to think about.
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SIKSUKR
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