Soft water, anode wear
Charlotte, Raleigh, Durham, Greensboro and Winston-Salem all draw from Piedmont lakes and rivers with soft water. Sediment builds slowly in tanks here, and tankless units need descaling less often than in hard-water states. The catch is that soft water wears anode rods faster, so checking the anode around year four or five is the most valuable maintenance a North Carolina homeowner can do. Coastal cities such as Wilmington and Jacksonville rely more on groundwater, which is harder.
Crawlspaces and humidity
Crawlspace foundations are common across the state, and some water heaters live in them. Damp crawlspaces corrode fittings, make replacements slow through small hatches, and expose pipes to freezing during ice storms. Garage and utility room installs are more common in newer homes, and attic installs show up in some two-story houses, where a working drain pan is essential.
Licensing, permits and costs
North Carolina licenses plumbing contractors through the State Board of Examiners of Plumbing, Heating and Fire Sprinkler Contractors. Permits for water heater replacement are generally issued by county or city inspection departments, such as Mecklenburg County Code Enforcement for Charlotte. Typical repairs run $150 to $600, and a standard tank replacement usually costs $1,400 to $3,200. See water heater replacement for details.
The city pages below cover each city's water supply, typical problems and permit details.