Environmental Compliance, Waste & Water Management worked example

Industrial Wastewater Load with average wastewater flow input of 0.21 MGD: a worked example

This worked example runs the industrial wastewater load numbers for a tougher week than the baseline: average wastewater flow input of 0.21 MGD instead of the typical 0.42 MGD. Estimate industrial wastewater load from average wastewater flow, pollutant loading factor, and sampling or reporting days.

The inputs for this scenario

  • Average wastewater flow input: 0.21 MGD (the input this scenario stresses; the baseline uses 0.42)
  • Pollutant loading factor: 2,150 lb / MGD-day (held at the documented default)
  • Sampling or reporting days: 30 days (held at the documented default)

Working through the calculation

  • The calculation starts from the formula this tool documents: Industrial Wastewater Load = average wastewater flow × pollutant loading factor.
  • Industrial Wastewater Load works out to 452 lb / day at these inputs, and this is the headline figure for the scenario.
  • Average pollutant load per reporting day works out to 15.05 lb / day at these inputs.
  • Average wastewater flow input works out to 0.21 MGD at these inputs.
  • Pollutant loading factor works out to 2,150 lb / MGD-day at these inputs.

How this compares with the baseline

  • Against the tool's baseline example, where average wastewater flow input sits at 0.42 MGD and the headline result is 903 lb / day, this scenario comes in 50% below the baseline at 452 lb / day.
  • Use it when preparing monthly DMRs, checking headroom against a permitted mass limit, or estimating loading to a POTW for a pretreatment surcharge calculation. A result at this level usually justifies acting on the stressed input before touching anything else, because every other figure in the table is downstream of it.

Results at a glance

  • Industrial Wastewater Load: 452 lb / day (headline result)
  • Average pollutant load per reporting day: 15.05 lb / day
  • Average wastewater flow input: 0.21 MGD
  • Pollutant loading factor: 2,150 lb / MGD-day

Run it with your numbers

  • To rerun this with your own numbers, open the live Industrial Wastewater Load calculator, set average wastewater flow input to your actual value, and adjust the remaining inputs to match your operation.

Last reviewed 2026-05-12.