Silverhill is a quiet small town between Robertsdale and Fairhope along County Road 55, with Highway 104 forming the secondary spine. There's no large retail anchor and no industrial corridor to point to — the town's footprint is largely residential and small-acreage rural. Census data puts the median year built at 1992 across about 350 housing units, with 10 pre-1939 structures. That's the smallest housing-unit count of any city on the list and the average household size of 2.68 suggests a slightly larger-family pattern than the Baldwin median.
Water service is a mix of small community systems and private wells, with no single dominant utility. Which side a particular address falls on isn't always obvious from the street, which means the first practical step for a Silverhill household exploring filtration is identifying the actual water source rather than assuming a city-wide pattern.
Hardness is the dominant complaint on the systems and the wells alike — the Miocene aquifer that underlies central Baldwin runs consistently hard at this latitude — with iron as the secondary issue, mostly showing up as orange staining in toilet tanks and on water-heater anode rods. A softener is the standard residential install here and the direct answer to the hardness; iron in the same aquifer needs dedicated equipment we do not install. On the private wells, annual coliform-and-nitrate testing is the appropriate baseline given the small-acreage rural setting and the proximity to the agricultural land that surrounds Robertsdale.