Environmental Compliance, Waste & Water Management worked example

Wastewater Surcharge at 110% billable discharge share: a worked example

What does the result look like when billable discharge share reaches 110%? The full calculation is worked below with real intermediate numbers. an environmental or operations manager needs to budget or compare wastewater surcharge

The inputs for this scenario

  • Excess pollutant load above permit limit: 1,250 lb (unchanged)
  • Utility surcharge rate per pound: 0.82 $ / lb (unchanged)
  • Billable discharge share: 110 % (raised for this scenario; the documented default is 100)
  • Sampling and administrative fees: 375 $ (unchanged)

Working through the calculation

  • Applying the documented formula (Variable cost = excess pollutant load × surcharge rate × billable discharge share) to the inputs above produces each figure below.
  • At this operating point the engine returns 1,503 $ for total wastewater surcharge, the number this scenario is built around.
  • At this operating point the engine returns 1.2 $ / lb for surcharge cost per excess pound.
  • At this operating point the engine returns 1,128 $ for variable wastewater surcharge.
  • At this operating point the engine returns 375 $ for sampling and administrative 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 1,400 $, this scenario comes in 7.32% above the baseline at 1,503 $.
  • A figure at this level is achievable when billable discharge share is genuinely sustained, not just peaked for a shift. Real surcharges depend on the exact pollutants and concentration thresholds in your local sewer-use ordinance; a single blended per-pound rate is an approximation when multiple parameters (BOD, TSS, FOG) are billed at different rates.

Results at a glance

  • Total wastewater surcharge: 1,503 $ (headline result)
  • Surcharge cost per excess pound: 1.2 $ / lb
  • Variable wastewater surcharge: 1,128 $
  • Sampling and administrative fees: 375 $

Run it with your numbers

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

Last reviewed 2026-05-12.