Environmental Compliance, Waste & Water Management worked example

Water Reuse Payback with water reuse project investment of 462,500 $: a worked example in environmental compliance, waste & water management

This scenario runs the water reuse payback calculation on the strong side: water reuse project investment of 462,500 $, with every other input held at its documented default. a plant, EHS, or sustainability manager needs to screen water reuse payback

The inputs for this scenario

  • Water reuse project investment: 462,500 $ (raised for this scenario; the documented default is 185,000)
  • Annual water and sewer savings: 62,000 $ / yr (unchanged)
  • Annual reuse system support cost: 11,500 $ / yr (unchanged)

Working through the calculation

  • Applying the documented formula (Net annual savings = annual water and sewer savings - annual reuse system support cost) to the inputs above produces each figure below.
  • At this operating point the engine returns 9.16 yr for water reuse payback, the number this scenario is built around.
  • At this operating point the engine returns 50,500 $ / yr for net annual environmental savings.
  • At this operating point the engine returns 462,500 $ for water reuse project investment.
  • At this operating point the engine returns -210,000 $ for five-year net value.

How this compares with the baseline

  • Against the tool's baseline example, where water reuse project investment sits at 185,000 $ and the headline result is 3.66 yr, this scenario comes in 150% above the baseline at 9.16 yr.
  • Use it when evaluating or comparing water-recovery capital projects, or when justifying a reuse retrofit to finance against a target payback threshold. Treat this as a target state: the delta against the baseline quantifies what the improvement is worth before you commit to chasing it.

Results at a glance

  • Water Reuse Payback: 9.16 yr (headline result)
  • Net annual environmental savings: 50,500 $ / yr
  • Water reuse project investment: 462,500 $
  • Five-year net value: -210,000 $

Run it with your numbers

  • Every input above is editable in the live Water Reuse Payback calculator, which recalculates instantly and can be shared with the inputs intact.

Last reviewed 2026-05-12.