We've forgotten that the Big Lake falls within "
The Winnipesaukee Basin"? (And that NOT all waste arrives in the lake through home septic systems).
All leachates follow gravity from homes at higher elevations than just the lakefront mansions. I've noticed a second tier of home-building behind the usual McMansions. (One within a stone's-throw of me has been rented-out to as many as five families at once!)
Home septic system designs were based on Massachusetts models, a state whose soil is comprised of much less granite than New Hampshire's.
The
comprehensive answer is the routing all basin-wide waste waters. How else to exclude dishwasher soaps and water-softening salts from our collective leachate?
Hard to believe, but some here assailed my years-earlier answer of sending
all septic systems' discharges to the sewage plant in Franklin--even if that meant that submerged pipelines must be sent across the lake's deepest parts. If NH had started a Federal grant process back then, this poisoning of our lakewaters would be old news. (Instead of the usual periodic distress signals).
Sure, some "spot-cleaning" would be necessary among the entire Winnipesaukee Basin's warm and shallow areas, but more shading of these areas using conifers (particularly White Pine) should be encouraged--if not mandated. (Deciduous tree-leaves make up much of the lake's "phosphorus-laden sediments".
Any other answer will be comprised of
half-measures.