Energy & Sustainability worked example

Plant Water Treatment Cost with treated water volume of 3,100 kgal: a worked example

What does the result look like when treated water volume reaches 3,100 kgal? The full calculation is worked below with real intermediate numbers. a facilities or EHS lead needs total and unitized water treatment cost

The inputs for this scenario

  • Treated water volume: 3,100 kgal (raised for this scenario; the documented default is 1,250)
  • Variable treatment cost: 7.8 $ / kgal (unchanged)
  • Treatment labor and testing cost: 2,200 $ (unchanged)
  • Fixed treatment overhead: 1,450 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable treatment cost = treated water volume × variable treatment cost per kgal) to the inputs above produces each figure below.
  • At this operating point the engine returns 27,830 $ for total plant water treatment cost, the number this scenario is built around.
  • At this operating point the engine returns 8.98 $ / kgal for treatment cost per kgal.
  • At this operating point the engine returns 24,180 $ for variable water treatment cost.
  • At this operating point the engine returns 3,650 $ for labor, testing, and fixed overhead.

How this compares with the baseline

  • Against the tool's baseline example, where treated water volume sits at 1,250 kgal and the headline result is 13,400 $, this scenario comes in 108% above the baseline at 27,830 $.
  • A figure at this level is achievable when treated water volume is genuinely sustained, not just peaked for a shift. It treats variable cost as linear with volume, but chemical dosing, blowdown, and regeneration can step or be non-linear; verify the per-kgal rate holds across your actual flow range.

Results at a glance

  • Total plant water treatment cost: 27,830 $ (headline result)
  • Treatment cost per kgal: 8.98 $ / kgal
  • Variable water treatment cost: 24,180 $
  • Labor, testing, and fixed overhead: 3,650 $

Run it with your numbers

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

Last reviewed 2026-05-12.