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I need an NPDES Grab Sample. What is that?

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Your Waste Water System discharges into a public water way, and is therefore subject to the Ohio Evironmental Protection Agency (OEPA) National Pollutant Discharge Elimination System (NPDES). The rules mandate that your waste water must be tested in a Grab Sample (grabbing the water from a free flowing sample port) once a year in order to determine that the waste water is properly treated before entering a public water way.

What do you test for?

All water that flows to Lake Erie is subject to the following tests:

  • CBOD
  • Total suspended solids
  • Ammonia
  • Fecal coliform
  • Ecoli

When will I get the results?

The results are mailed in about 7-10 days.

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Mack Industries Inc offers Norweco Factory Trained Grab Sampling for current maintenance policy customers, System Use and Homeowner Education. Call Today for an appointment.


  • Locally Owned and Operated.
  • Experienced Technicians.
  • Provide maintenance and repairs, not just inspections.
  • Over 50 years of experience installing and designing Sewage Treatment Systems.
  • Norweco and Jet Distributors.