Laundry Water Recycling Calculator

Commercial laundries use enormous volumes of water, and rinse water — the final, relatively clean stage of a wash cycle — is the portion most practical to capture and reuse, typically in earlier wash or pre-rinse stages of the next load. This calculator takes your daily water use and a recycle-rate percentage (capped at 80%, reflecting that you can realistically recover only a portion of total water use, not all of it, since heavily soiled wash water isn't worth recycling) to find daily gallons saved. It then scales that to an annual figure using a fixed 300 operating days per year — a simplification for facilities that don't run seven days a week or close for holidays — rather than the literal 365-day calendar. The dollar savings side is where this calculator earns its keep: it counts both sides of the water bill.

Every gallon you don't draw from the municipal supply saves you the water cost, but every gallon you don't send down the drain also saves you the separate sewer/discharge cost, and many commercial water bills charge for both independently, often at different rates. The calculator sums both savings streams into a total annual savings figure and divides your recycling system's purchase-and-install cost by that total to get a simple payback period in years. It does not account for the system's own ongoing costs — filtration replacement, added electricity for pumps, or periodic maintenance — so treat the payback figure as an optimistic upper bound and pressure-test it against your specific system's operating cost before committing capital. Local water and sewer rates also vary widely by municipality, so pull your actual per-gallon rates rather than using the defaults for a real decision.