Every summer for the better part of a decade, Pelham has run the same play at Long Pond. Someone spots a greenish scum near the Town Beach. The state gets a call. Samples go out. A few days later, New Hampshire's Department of Environmental Services posts a bulletin telling residents to keep their kids and dogs out of the water until the cell counts drop. Then the bloom fades, the advisory lifts, and everyone goes back to swimming until it happens again.
That cycle has repeated at least five times since 2018. On Wednesday, September 23, for the first time, the town is doing something other than waiting for the next one. Pelham and the engineering firm Weston & Sampson are holding a public meeting at Sherburne Hall in Pelham Town Hall, 6 to 7 p.m., to start work on a Long Pond Watershed Management Plan. It is the first attempt to treat the blooms as a pattern with a cause, rather than a string of unrelated summer inconveniences.
The Timeline Nobody Had Written Down
Pull the advisories together and the pattern is hard to miss. Long Pond saw two separate cyanobacteria warnings in the summer of 2018 alone, one at the end of June and a second about five weeks later. The state issued another advisory in August 2020, with cell concentrations tested between 69,000 and 137,000 per milliliter against a state action threshold of 70,000. A year later, in August 2021, testing turned up something stranger: open water readings of just 30,000 to 40,000 cells per milliliter, well under the threshold, while the beach itself was measuring 450,000 to 3.6 million. The lake looked fine from a boat. The shoreline where people actually swim did not. Another advisory followed in August 2022, this one clearing in eight days.
That same September, the state issued a separate advisory for Little Island Pond, one of Pelham's other three named ponds, with counts as high as 435,800 cells per milliliter. Two different ponds, two different years, the same underlying condition.
Nobody at NHDES ever framed these as connected events. Each advisory reads like a standalone incident: a bloom appears, gets sampled, gets tracked, gets cleared. What the record actually shows, laid end to end, is a watershed that keeps producing the same result under the same conditions, at more than one of its water bodies, for going on eight years.
Why the Same Weather Keeps Producing the Same Bloom
Back in 2018, after Pelham's second warning of that summer, Andrea LaMoreaux of the New Hampshire Lake Association explained the mechanism in plain terms: blooms build when elevated nutrient levels combine with warm water and sunshine. "The perfect storm has come together at a handful of our lakes," she said at the time.
That explanation matters more than it might seem, because it points away from the lake itself and toward everything that drains into it. Nutrients don't originate in the water. They wash in from the land around it, from fertilizer, from failing septic systems, from stormwater runoff picking up whatever sits on lawns and roads before it reaches the shoreline. Testing the pond tells you the bloom is happening. It does not tell you where the nutrients feeding it are coming from, which is exactly the gap a watershed-level study is built to close. A lake plan looks at the water. A watershed plan looks at the land fifty properties upstream that's been quietly feeding it for years.
That distinction is why this month's meeting is a departure rather than a formality. The town's own announcement, tied directly to what it calls "recurring cyanobacteria blooms," frames the plan as an attempt to identify pollution sources and recommend action, not just monitor the next one when it arrives.
A Town Built Around Four Ponds
Long Pond and Little Island Pond aren't Pelham's only water. The town's historical society counts four named ponds inside its borders: Long Pond, Gumpas Pond, Little Island Pond, and White's Pond, plus two brooks, Beaver Brook and Golden Brook, that still hold trout. For more than a century, this cluster of water has been the reason Pelham exists as a place people go, not just a place people pass through.
That history is easy to find if you know where to look. In the early 1930s, the Greater Lowell Girl Scout Council bought more than 200 acres on the west side of Little Island Pond and established Camp Runels, which is still running Girl Scout programs there today, more than sixty years on. Long Pond had its own camps once. The Lowell YMCA held 56 acres and 800 feet of frontage there as Camp Alexander, a day camp that eventually became town property. The Nashua Girl Scout Council ran Camp Kiwanis on Long Pond's west shore starting in the 1950s. Both of those closed. Camp Runels is the one that made it, and it happens to sit on the same pond that logged its own bloom advisory in September 2022.
Jeremy Hill, at 577 feet the highest point in town, once carried an observation tower described locally as the tallest lookout within 30 miles. It's gone now, but the hill is still there, and so is the habit of climbing it.
What People Are Actually Doing at the Water Right Now
None of this history changes the fact that Pelham residents are still using these ponds and the woods around them every week. The Pelham Town Beach at Veterans Memorial Park runs through early fall and requires a resident permit, priced at $20 for a first purchase and $15 to renew from the year before. Muldoon Park, off Mammoth Road, has run an 18-hole disc golf course since it was completed in September 2007, threaded through woods that also hold walking trails leading down to two ponds and to Beaver Brook itself. Cutter Woods, off Sherburne Road, offers a separate trail network open to walking, biking, cross-country skiing, and snowshoeing depending on the season.
None of that changes because of an advisory or a meeting. What changes, potentially, is whether the town spends the next eight years reacting to the same warning or starts addressing what's actually feeding it.
What the Meeting Actually Is
Wednesday's session isn't a vote and it isn't a cleanup announcement. It's the input-gathering stage of a plan that will take time to produce results, the kind of meeting where residents who live near the water, use the water, or simply know the watershed are asked to describe what they've observed. The town has said as much directly: those with knowledge of the watershed are the ones it wants in the room.
For a place that has organized its recreational identity around four ponds for close to a century, that's a meaningful shift. Not because one meeting fixes a nutrient problem that took decades to build, but because it's the first time Pelham has tried to understand the problem at the scale it actually exists.
If you're a longtime Pelham resident with a stake in Long Pond's future, or if you're weighing what it means to put down roots near water that the town is only now studying seriously, Rebecca Curran Realty has spent years working this exact stretch of southern New Hampshire and can walk you through what a property near Pelham's ponds is actually worth today. Reach out for a Get Your Instant Home Valuation and a conversation grounded in what's really happening in town, not just what's listed on a portal.
