Sample Mailing Instructions

For activated sludge and most other systems, a 50 ml MLSS sample is needed. This should be collected from the end of the aeration process (generally the end of the aeration basin or feed to clarifier(s)) placed in a plastic, screw-capped bottle filled no more than ½ full (for air) with the lid taped. Overnight delivery is preferred. Please include email address for report to be sent to and billing information (name, phone number, and address of facility, email/ person (s) to send invoice to)

If any foam is present on the aeration basin or final clarifier, this can be collected in a separate container (50 mLs is plenty) and analyzed at no additional charge.

If the system has multiple basins/ trains each should be analyzed individually (do not mix into one sample). For lagoon systems, the effluent end of each cell is analyzed. Algae identification and counting is included in analysis. Lagoon samples should be collected in a well-mixed area (sample ports between each lagoon are ideal). 1000 mL is needed for each sample container because settling of sample is needed prior to evaluation.

Sample Mailing Address

All samples should be sent to:
101 Garfield Avenue
Menasha WI
Attention: Microscopic Evaluation


Activated Sludge: $250 (includes foam analysis)

Lagoon Systems: $350 (For systems with >5 cells, higher rates may apply)
*If higher sample volume/ frequency is desired, occasional complimentary reports are included for discount

  • $25 per additional sample location (activated sludge samples)
  • Now accepting credit cards for payment (3.62% surcharge for processing)

Turnaround Time

Expected turnaround time for evaluation between 1-4 business days.


MCO office: (920) 751-4299 or [email protected]

Ryan Hennessy: (920) 573-2820 or [email protected]

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Call Us: (920) 751-4299