"Why is Sidney's mil rate so much lower than Oakland's?" That's the question buyers start typing once they've narrowed a Messalonskee Lake search down to two or three towns and pulled up each one's tax page side by side. The number looks like an easy answer. It isn't, and the reason why matters more than the number itself.
The number that looks like the whole answer
The Town of Sidney lists its current mil rate for 2025/2026 at 6.24 per $1,000 of assessed value. Set that next to a neighboring lake town with a rate in the low double digits and the conclusion writes itself: Sidney is cheaper. Buyers comparing towns on the same body of water lean on that shorthand constantly, because it's the only number both towns publish in a place you can find in thirty seconds.
The problem is that a mil rate only tells you how many dollars a town collects per thousand dollars of assessed value. It says nothing about how close that assessed value sits to what the house would actually sell for. Two towns can commit nearly identical budgets and land on very different mil rates simply because they assess property differently, and neither number is wrong. They're just not answering the same question.
What the mil rate hides
Maine sets a floor on this: assessed values can't fall below 70% of fair market value, and if two comparable properties in the same town land more than 20% apart in assessed value, the town is required to redo its assessments. That's the guardrail. It's a wide one.
Oakland, which shares Messalonskee Lake's shoreline with Sidney and Belgrade, tells you exactly where it sits inside that guardrail. The town's own assessing department states that assessment is 80% of real estate market value, and that Oakland's last full town-wide revaluation was in 1996, roughly thirty years ago. That combination matters. A home that has appreciated well beyond its 1996 baseline can still carry an assessed value that lags far behind what it would fetch today, which means Oakland's mil rate has to run higher just to raise the same revenue on paper.
Sidney's assessing page doesn't spell out an assessment ratio the way Oakland's does. That's not a knock on the town. It's the point. If a town's site doesn't answer "how close is assessed value to market value, and when did we last check" in one line, the mil rate alone isn't yet a fair comparison. It's a question to ask, not an assumption to make.
Even the state's own tool for leveling this playing field admits the limits of a snapshot. Maine Revenue Services calculates an equalized state valuation specifically so towns can be compared fairly, but by its own account that valuation lags actual market values and municipal assessments by nearly two years by the time it's finalized. The number built to correct for stale assessments is itself running on a two-year delay.
Here's what that looks like when you line the two towns up on what they actually publish, rather than what a buyer assumes:
| What a fair comparison needs | Sidney | Oakland |
|---|---|---|
| Current mil rate | 6.24 per $1,000 (2025/2026) | Published in annual commitment books, not stated as a single headline rate |
| Assessment ratio | Not stated on the assessing page | 80% of market value |
| Last full revaluation | Not stated | 1996 |
Neither column is complete on its own, and that's exactly why the raw mil rate comparison buyers reach for first doesn't hold up. You need both halves of the equation from both towns before the number means anything.
The camp you're touring might be grandfathered, and that changes what you can do with it
The same three towns that ring Messalonskee Lake, Sidney, Oakland, and Belgrade, each administer their own version of Maine's Mandatory Shoreland Zoning Act. That statewide law requires a 250-foot regulated shoreland zone measured from the normal high-water line of any great pond, which is defined as a lake over 10 acres. Messalonskee Lake, at roughly 3,500 acres, sits well inside that definition, and every camp and cottage on its shore falls under the rule.
Sidney's own zoning ordinance spells out exactly which waters this applies to locally. Messalonskee Lake, Gould Pond, Joe Pond, Penny Pond, Silver Lake, and Ward Pond all fall inside the town's Lake Shore District, while land within 250 feet of the Kennebec River gets its own River Shore District. This isn't abstract policy language. It's the exact map a buyer's camp sits on.
Here's why it matters at the closing table. Many of the older camps on Messalonskee Lake predate the shoreland zoning ordinance, sited close to the water back when there was no setback to observe. Under shoreland zoning, those buildings became non-conforming: the town lets them stand, be maintained, and be passed down, but it won't let them grow. A structure sited inside today's 250-foot line generally can't be enlarged, and any major rebuild has to meet the current setback rather than the footprint that's stood there for generations.
That's why some active Messalonskee Lake listings advertise a "grandfathered" position on the water as a selling point. It's real, and for a buyer who just wants the camp as it stands, it's not a problem. But it means the value is partly locked into what already exists on that lot. Before you picture the primary suite addition or the wraparound deck, ask the town's code enforcement officer what the district actually allows on that specific parcel. That conversation happens before the offer, not after.
Same lesson, two different desks
The lake doesn't care which town's line it falls on. The paperwork does. Whether you're weighing Sidney's tax bill against Oakland's or sizing up whether a Messalonskee camp can support the addition you're picturing, the lesson is the same: the number on a town's website is a starting point, not a conclusion. The mechanism behind it, the assessment ratio, the revaluation year, the zoning district and its setback, is where the real comparison happens.
Three questions worth asking before you draw a conclusion from either number:
- What is this town's current assessment ratio, and when was its last full revaluation?
- Is the property inside a shoreland district, and if so, does the structure predate the ordinance?
- Would any renovation or addition require a variance from the local Board of Appeals, and has the code enforcement officer confirmed it directly?
Quick FAQ
Does a lower mil rate always mean lower property taxes? Not by itself. A mil rate is only half the math. Without knowing the town's assessment ratio and how recently it revalued, two towns' mil rates aren't measuring the same thing.
Can I expand or rebuild a grandfathered camp on Messalonskee Lake? Generally you can maintain, repair, and pass down a non-conforming structure, but enlarging it or moving it closer to the water typically isn't allowed without meeting the current shoreland setback or securing a variance. The answer depends on the specific lot and district, so it's worth a call to the town's code enforcement officer before you assume anything is possible.
Where do I find a town's actual assessment ratio and revaluation history? Start with the town's assessing office. Oakland states its ratio and revaluation year directly on its assessing page. If a town doesn't publish that information as clearly, ask for it before comparing its mil rate to anywhere else.
Twenty years spent evaluating land and buildings, first as a wildlife biologist and then building his own home from the ground up in 2004, taught me that the number on the sign is rarely the whole story. If you're weighing a lake town's tax picture or trying to understand what a grandfathered camp will actually let you do, let's look at the specific parcel together before you assume anything from a headline rate. Joseph Saltalamachia is ready to help. Let's Connect.
