Environmental Compliance, Waste & Water Management worked example

Water Discharge Cost at 110% billable discharge share: a worked example

Push billable discharge share up to 110% and the picture changes. This example computes every intermediate figure at that operating point. an environmental or operations manager needs to budget or compare water discharge cost

The inputs for this scenario

  • Discharged water volume: 1,850 kgal (unchanged)
  • Discharge or sewer rate: 6.4 $ / kgal (unchanged)
  • Billable discharge share: 110 % (raised for this scenario; the documented default is 100)
  • Fixed permit, meter, or account fees: 780 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable cost = discharged water volume × discharge or sewer rate × billable discharge share) to the inputs above produces each figure below.
  • At this operating point the engine returns 13,804 $ for total water discharge cost, the number this scenario is built around.
  • At this operating point the engine returns 7.46 $ / kgal for discharge cost per kgal.
  • At this operating point the engine returns 13,024 $ for variable water discharge cost.
  • At this operating point the engine returns 780 $ for fixed permit, meter, or account fees.

How this compares with the baseline

  • Against the tool's baseline example, where billable discharge share sits at 100% and the headline result is 12,620 $, this scenario comes in 9.38% above the baseline at 13,804 $.
  • It computes total water discharge cost by multiplying discharged volume by the sewer rate and billable share, then adding fixed permit, meter, and account fees, and also returns an effective cost per kgal. The value of this scenario is the size of the gap it exposes: that gap, priced out over a year, is the budget you can justify spending to close it.

Results at a glance

  • Total water discharge cost: 13,804 $ (headline result)
  • Discharge cost per kgal: 7.46 $ / kgal
  • Variable water discharge cost: 13,024 $
  • Fixed permit, meter, or account fees: 780 $

Run it with your numbers

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

Last reviewed 2026-05-12.