What Denver water actually does to a tank
Maintenance advice is usually written for hard water, and most of this region does not have it. Your supply comes from the Lincoln County system, drawn from Lake Norman, and the question worth asking is not how much scale it leaves but how corrosive it is. Soft, lightly buffered water forms no protective film inside the tank lining, so the anode rod is doing the entire job of protecting the steel.
That inverts the standard advice. An annual flush matters less here than it would in a hard-water city, and the anode rod matters far more. A tank that has never had its anode checked at eight years old is running on whatever is left of it, and once that is gone the tank itself starts corroding.
- Anode inspection is the one job on this list that changes how long the tank lasts.
- A T&P test with a pressure reading, because a weeping relief valve is usually pressure rather than a failed valve.
- A flush, with an honest warning first: on a tank over about ten years that has never been flushed, the drain valve frequently will not reseat once opened.
What Denver itself changes
The housing in Denver
Denver is the Lake Norman end of Lincoln County and it has grown accordingly: large newer houses on large lots, built in concentrated waves from the 2000s onward, with the older rural properties that were here first scattered between them. The newer stock is now arriving at first replacement more or less together, and the larger the house the more likely the original tank was undersized for how the household actually ended up using it.
Where the heaters sit
Garage and utility room in the newer building, with attic installs in the larger two-storey houses. On the bigger lots the run from heater to the furthest bathroom is long, which is a recirculation question rather than a fault, and worth separating before anyone sells you a bigger tank.