The usual appliance sources
- Dishwasher supply lines, drain hoses and door seals.
- Refrigerator ice maker and water dispenser lines.
- Washing machine hoses, especially older rubber hoses.
- Garbage disposal and sink connections under the kitchen sink.
Washer discharge water carries detergent and soil, so it counts as Category 2. The EPA WaterSense program has tips on fixtures and leaks, and the Consumer Product Safety Commission lists appliance recalls.
