If you open the ice tray in a St. Louis kitchen and find small orange or brown specks in the cubes, the water supply is the first suspect. Iron is a common concern for homeowners in the region because it stains fixtures, marks laundry and changes how water looks. Iron does not disappear when water freezes, so it can stay trapped in the ice, settle on the tray or collect in the bin.
What the specks usually are
Iron that reaches the house in dissolved form can turn rust-colored once it meets air, and ice made from that water can carry the particles inside the cube. Sometimes the specks look like grit, and sometimes they look like thin flakes that float when you pour a drink. Other sources are common too. A dirty ice bin, a film of slime on the tray, and debris from the ice maker's inlet screen can all look similar at a glance. Each has a different cause and a different fix, so it helps to narrow it down before you spend money on equipment.
Check the glass first
Fill a clear glass with cold water from the kitchen faucet and let it sit on the counter for a while. If a rusty tint or fine particles appear as the water sits, iron is a strong possibility. If the glass stays clear and the specks only show up in the ice, the problem is more likely in the ice maker, the bin or the line feeding the machine.
Look at the ice maker and bin
- Pull out the bin and look for pink or dark slime, which points to biofilm rather than iron.
- Check the tray and the water fill area for a dark film or buildup.
- Find the inlet screen where the supply line feeds the ice maker and look for trapped debris.
- Inspect the supply line for kinks or damage, and check that the shutoff valve is fully open.
Simple home tests for iron
Basic test kits that change color in the presence of iron are sold at many hardware stores and can give a rough sense of whether iron is present. Read the directions carefully, because results depend on how the sample is collected and how long it sits before you read it. A certified lab gives a more detailed answer and can report what is in the water and in what form. Sample the cold water at the kitchen tap, and note whether the sample came before or after any filter in the line, since that changes what the result tells you. Your provider's annual water quality report can also show whether iron has been measured in your area, though it may not reflect the water inside your own home.
What to do next
- Empty the ice bin, then clean the bin and tray following the ice maker manufacturer's instructions.
- Clean or replace the inlet screen if it looks clogged or discolored.
- Run a fresh batch of ice and discard the first batches, since they may still hold particles.
- If the glass test or a lab test points to iron, look at options for treating the water at the kitchen line or the whole house before making a decision.
Start with the simplest checks, since many ice problems come from the bin or the machine rather than the water itself. If the glass shows color or particles, the water is the next place to look, and a test will tell you more than guessing will.