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NPDES Testing: What are they testing for? What are common causes of Failure?

1 minute estimated reading time

Updated on March 8th, 2024

Test PerformedTesting ForCommon CausesCommon Corrections
Dissovled OxygenHow much oxygen is in the aeration chamber for the bacteria to live.
The bacteria eats waste.
Aerator shaft not clear.
Aerator air output too low.
Using laundry detergent or fabric softner that is high in lanolin causing build up in the aerator shaft.
Allowing water softner discharge enter the system.
Total Suspended SolidsSolids suspended in the discharge flow.Excessive solids system needs pumped.
Leaking risers.
Solids in trash trap are excessive and need pumped.
Hydraulic Overload – solids are moving from one chamber to the next too soon and not breaking down.
Risers are allowing ground water into system and other contaminants.
Storm water connected to system – gutters or storm corks.
Nitrogen AmmoniaA toxic pollutantHarsh chemicals i.e.: bleach or deodorizersExcessive amounts of bleach or utility tubs from garage tied into the system.
High PH in the system.
CBOD5Oxygen consumed by bacteria for 5 daysAerator shaft not clear.
Aerator air output too low.
Re-aeration not operating properly.
Using laundry detergent or fabric softener high in lanolin causing build up in the
aerator shaft.
Allowing water softener discharge to enter the system.
Re-aeration air stone plugged or not working.
E.coliBacteriaUltra Violet not operational.
Chemicals need added.
Repair or replace UV.
Add chemicals.

Why Choose MACK INDUSTRIES?

  • 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.