Energy & Sustainability worked example

Plant Water Treatment Cost with treated water volume of 630 kgal: a worked example

Here is what the math looks like when conditions slip. We hold every other input steady and drop treated water volume to 630 kgal, then walk the calculation through step by step. Estimate plant water treatment cost from treated volume, variable treatment cost, labor, and overhead.

The inputs for this scenario

  • Treated water volume: 630 kgal (the input this scenario stresses; the baseline uses 1,250)
  • Variable treatment cost: 7.8 $ / kgal (held at the documented default)
  • Treatment labor and testing cost: 2,200 $ (held at the documented default)
  • Fixed treatment overhead: 1,450 $ (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Variable treatment cost = treated water volume × variable treatment cost per kgal.
  • Total plant water treatment cost works out to 8,564 $ at these inputs, and this is the headline figure for the scenario.
  • Treatment cost per kgal works out to 13.59 $ / kgal at these inputs.
  • Variable water treatment cost works out to 4,914 $ at these inputs.
  • Labor, testing, and fixed overhead works out to 3,650 $ at these inputs.

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 36.09% below the baseline at 8,564 $.
  • The practical read: the gap between this scenario and the baseline is entirely attributable to treated water volume, so recovering it is worth quantifying in dollars before considering equipment or staffing changes. 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: 8,564 $ (headline result)
  • Treatment cost per kgal: 13.59 $ / kgal
  • Variable water treatment cost: 4,914 $
  • Labor, testing, and fixed overhead: 3,650 $

Run it with your numbers

  • To rerun this with your own numbers, open the live Plant Water Treatment Cost calculator, set treated water volume to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.