By AFZ Appliance Repair. Published November 1, 2026.

Quick answer

Mineral-heavy water can hurt dishwashers, washers and ice makers. Learn the warning signs for homes on wells in Howard and Montgomery County, MD.

Hard water carries dissolved minerals (opens in a new tab) such as calcium and magnesium. Well water can also carry iron or sediment. Over time these leave scale and grit inside anything that fills, heats or sprays water. That often looks like an appliance failure when the real cause is the water.

Signs to watch for

Dishwasher: a white film on glasses, or clogged spray arm holes.
Washer: slow filling, which can mean clogged inlet screens, or stiff laundry.
Ice maker: small or hollow cubes, or a fill tube that keeps freezing.
Orange or brown staining: often a sign of iron in the water.

Simple things that help

Use rinse aid and the right amount of a quality dishwasher detergent.
Run a dishwasher cleaner on a regular schedule.
Clean the filter at the bottom of the dishwasher tub.
Replace the refrigerator water filter on time, or a little early if you are on a well.
Shut off the water and clean the washer's inlet screens if the fill is slow.

Check the system, not only the appliance

If several water appliances slow down at once, look at the house first. Check the whole-house filter, the softener's salt level and the well pressure tank. A pump that cycles on and off every minute can point to a pressure tank problem. Have the water tested (opens in a new tab) before you spend money on a treatment system, so that you know what you are treating. In Howard County, the Bureau of Environmental Health (opens in a new tab) recommends regular testing for anyone on a private well.

Tell your technician

If your home is on a well or has a softener, mention it when you book a repair. It changes what we look for. Our Howard County and Montgomery County pages have more on the kinds of homes we serve.