Direct answer: Calculate office water ROI by comparing current annual total cost with proposed annual total cost, then accounting for setup cost and the payback period.
Use documented invoices and labor assumptions. ROI is only as reliable as the consumption, service and contract inputs behind it.
Use a simple calculation
Annual benefit equals current annual cost minus proposed annual cost. Payback months equal setup cost divided by expected monthly benefit.
Test the assumptions
Run low, expected and high-use scenarios and include service changes or annual increases. The pricing guide and service guide identify inputs.
