Every drop of water that leaves a yard in Alton is headed for Winnipesaukee, and a lot of it gets there by way of the Merrymeeting River and a marsh the state has been trying to clean up for a decade. So the town has rules about where you put water, and so do we. Fix the wet basement, sure. But fix it so the fix doesn’t end up in the Bay.
Alton wrote a stormwater ordinance in 2015 and sharpened it in 2019, and the trigger is slope, not size. Build or grade on ground that’s 15 percent or steeper — measured over a 50-foot run — or within 20 feet of the top of a slope like that, and you owe the town a stormwater plan, temporary erosion control before you start, and an inspection before and after. There’s no square-footage floor. A drainage swale on a hillside lot in West Alton counts. And regardless of slope, no project of any size is allowed to push extra runoff onto a neighbor’s land; the Code Official can make you come back and fix it.
There’s a reason the town cares. The Merrymeeting River drains a big piece of Alton — Coffin Brook and the farms along it, the dense strip of houses and businesses along Route 11 into the Bay — and the marsh it runs through is roughly 500 acres of wetland held up by a dam in Alton. The 2019 watershed plan set a target of 10 parts per billion phosphorus where the river enters Alton Bay and named the usual suspects: septic seepage, stormwater off pavement, and eroding gravel roads. Sediment is phosphorus. A driveway ditch that washes out in April is fertilizer for the algae in July.
Two more local wrinkles. On lots created since 2006 the town keeps a 25-foot natural buffer around any wetland bigger than 10,000 square feet — no driveway, no structure, no grading in it, septic excepted. And a good part of the village and the Bay sits over the stratified-drift aquifer the town draws its water from; in that overlay the town wants runoff soaked into the lot, not piped off it. Which, as it happens, is also the cheapest way to make a wet yard dry.
The soil does the rest. Glacial till on the hills is dense and slow, so spring melt runs across it instead of into it and ends up in the low corner of the yard, or the basement. The sand near the Bay drinks water fine until the water table comes up in April and the basement floor becomes the lowest point in the neighborhood.
If your Alton lot slopes toward the lake, get the erosion control plan done before the excavator shows up. The town inspects before work starts, and a crew idling while paperwork catches up is money you don’t need to spend.
We look before we dig. Where does the water come from, where is it trying to get to, and what’s stopping it? On the till lots the answer is usually a curtain drain on the uphill side — a trench to below footing depth, perforated pipe in clean stone wrapped in fabric, pitched to daylight below the house — plus a regrade at the foundation so the ground falls away six inches in the first ten feet. On the sand lots the fix is more often footing drains that actually daylight instead of ending in a dry well that’s full by March.
Surface water we handle with shape. Broad grass swales instead of narrow ditches wherever the lot allows, because a swale slows water and lets it soak; a ditch just moves the problem downhill faster. Where flow concentrates — the bottom of a steep driveway, the corner where two roofs drain — we build a stone-lined infiltration trench or a small rain garden sized to hold the ten-year storm the town’s standard uses. Culverts under driveways and camp roads get sized to the brook they’re carrying, with a splash pad at the outlet so the water arrives at the marsh as water, not mud.
On any lot the ordinance touches we set the silt fence and a stabilized construction entrance first, call for the inspection, and leave you the plan and a photo record. It’s paperwork. It’s also what keeps the next owner from finding out the hard way that the drainage was never signed off.
Curtain and French drain installs in Alton run $2,000–$8,000 depending on length and how deep the footing sits; regrading, swales, and daylighting downspouts usually come in under that. If the lot triggers the town’s stormwater plan we tell you before you sign, and the erosion control is in the flat quote, not tacked on afterward.
If the ground is 15 percent or steeper over a 50-foot run, or your work is within 20 feet of the top of a slope like that, the town’s stormwater ordinance applies: a plan on a scaled drawing, erosion control before you start, and inspections. Flatter lots don’t need the plan, but you still can’t send new runoff onto anyone else’s property.
Two common reasons. On the hills it’s melt running across dense till and finding your foundation because the yard pitches toward it. Near the Bay and the river it’s the water table itself rising into a floor poured too low. The fix is different for each — a curtain drain and regrade for the first, daylighted footing drains for the second — and we’ll tell you which you have.
Not to the lake, and the ditch is a bad idea. Discharging straight into Winnipesaukee or a wetland runs into state shoreland and wetlands rules, and the town’s standard says a ten-year storm shouldn’t reach a water body untreated. We’d rather soak it into your lot — the sand around the village is good for it, and the aquifer overlay prefers it.
Maybe. If it’s a jurisdictional wetland over 10,000 square feet and your lot was created after March 2006, Alton keeps a 25-foot no-disturbance buffer around it. Smaller seeps and seasonal puddles are usually just drainage problems. A soil scientist can flag the line if it’s close, and we’ll tell you if it’s worth the call.
Directly, if you’re anywhere in that watershed — much of the south side of town. The 2019 plan is trying to cut the phosphorus reaching Alton Bay, and eroding ditches and gravel are a named source. Stabilized outlets, vegetated swales, and infiltration on your own lot do more for the marsh than anything built downstream.
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