That rotten egg smell or a tank that's acting old before its time
If you've noticed a faint sulfur smell near your water heater, or you're on your second heating element in three years, the tank is probably telling you something about a part that costs less than a dinner out. It's called an anode rod, and in Nixa's water, it wears out faster than most people expect.
Homeowners here tend to find out about this part the hard way, usually around year five or six, when a tank that should have another decade in it starts rusting from the inside and has to be replaced early.
Why Nixa's water is harder on this part than most places
This area sits on limestone and dolomite bedrock, and the groundwater that feeds Nixa and the surrounding Christian County system picks up a lot of dissolved minerals on the way. That's harder water than you'd find in a lot of the country, and hard water accelerates the chemical reaction the anode rod is built to absorb.
The anode rod is a sacrificial piece of metal, usually magnesium or aluminum, bolted into the top of the tank. Its whole job is to corrode first so the steel tank doesn't have to. In soft water that process is slow. In water like ours, the rod can be mostly eaten away in three to four years instead of the five to six you'd get elsewhere.
More on this from Redeemed HVAC in Nixa.
What the housing stock around here means for your tank
A lot of homes in Nixa were built during the growth years of the 1990s and 2000s, with water heaters tucked into garages, closets, or basements that were never climate controlled. In winter, an unheated garage here can swing well below freezing overnight, and that cold stresses the tank, the fittings, and the pressure relief valve even when the anode rod is doing fine.
Combine an aging rod with a tank that's already working harder because of temperature swings, and you get a shorter lifespan than the same unit would have in a heated utility room. It's a common pattern in this area: the tank itself isn't the problem, the conditions around it are.
What you can check yourself
You can pull the anode rod and look at it. It's usually under a hex-head plug on top of the tank, sometimes hidden under the hot water outlet pipe on older units. If more than six inches of the core wire is exposed, or the rod is down to a thin wire with no magnesium or aluminum left around it, it needs replacing.
You can also pay attention to what comes out of your hot water tap. A sulfur or rotten egg smell, especially one that's stronger in hot water than cold, usually means the rod has stopped doing its job and bacteria are reacting with the exposed metal. Rusty water, or sediment rattling around when you run the drain valve, points the same direction.
Flushing the tank once a year, draining a few gallons from the bottom valve until it runs clear, helps slow sediment buildup that makes the rod work harder than it needs to.
When it stops being a weekend job
Replacing an anode rod sounds simple, and sometimes it is. The problem is torque. These rods get installed at the factory with an impact wrench, and after a few years of mineral buildup they can seize hard enough that a homeowner wrench, or even a breaker bar, just twists the tank instead of loosening the rod. Force it the wrong way and you can crack a fitting or start a leak you didn't have before.
If the rod won't budge, if you're not sure whether what you're looking at is actually corrosion or just normal wear, or if the water heater is already showing rust at the base or around fittings, that's the point to call in a water heater repair service rather than keep working at it. In Nixa specifically, where hard water shortens the clock on this part, a technician who knows the local water conditions can also tell you whether a standard magnesium rod makes sense for your house or whether an aluminum or powered rod would hold up longer, which isn't something you can judge from the hardware store shelf.