Mount Airy, settled on Parr's Ridge in the 1830s
A handful of families — the Dorseys, Davises, and Bussards among the most prominent — settled Mount Airy in the early 1830s, around the same time the B&O built its rail line through the area in 1831. Henry Bussard later subdivided his own property into the lots that became downtown Mount Airy, and the town incorporated in 1894. Local history credits a freezing Irish B&O brakeman crossing the windy ridge with suggesting the name Mount Airy, though that is remembered as town folklore rather than a documented fact.
A watershed divide instead of a river
Mount Airy sits directly on Parr's Ridge, the height of land that separates the Patapsco River watershed from the Monocacy River watershed — meaning, unlike towns built along a single river or creek, there is no nearby waterway to anchor a water system to. Older Bussard-era lots and newer ridge-top subdivisions alike have historically depended more heavily on individual wells and septic systems here than in valley towns downstream, and well depth and yield can vary block to block along the ridge.
Plumbing services on the ridge
What a ridge-top estimate should cover
Ask a Mount Airy provider about well yield and septic capacity specific to your section of the ridge, since conditions can differ from a neighbor's property just a block away. Confirm how they would handle a long supply run on a larger ridge-top lot, and verify insurance and licensing before signing off on anything.