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--but from boats).
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 can be 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 Franklin is at full capacity, that must also be addressed.
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-cleansing" 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.