OC Laboratory

Event Coordinator	Event Vice-Coordinator
Melodi Clark Surveillance Lab Manager Wastewater Chemist City of Columbus	Nora Lough Narragansett Bay Commission Providence, RI

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2025 Laboratory Event Description

2025 Laboratory Judging Sheets: Head Judge; Judge 2; Judge 3; Judge 4
The judging sheets are provided primarily for event coordinators and judges information only. They are not part of the procedures or the rules of the event. They are for reference only and do not govern; the event descriptions govern. They are updated periodically and are subject to change at any time, without notice. They may not be used in any form of protest or question. There may be actions that are penalties that are not explicitly listed as an example on the penalty sheet.

Laboratory Event Tutorial*NEW 11/2025
Tutorials should be used as an overall suggestion not 100% accurate

Bench Sheet and Calculations	Equipment Purchase	Tables
Chlorine Bench Sheet	Discount Codes for Hach purchases (20% off) US - LABTEST Canada – LABTESTCA	Table Layout Photo is two set ups back to back. WEFTEC setup will be tables in a row – left to right – at an angle. Like an arrowhead.
Phosphate Bench Sheet
Calculations for the PO4 and CL2 solution/concentration
10209 instructions

**These videos are for informational purposes only and may not necessarily be a clean run.

Ask A Question

Questions are accepted up until 9/18/26. Questions can be asked at the pre-competition meeting on Monday, September 28 in New Orleans

Question	Answer	Date
On the material list there is a 50 g calibration mass and a OHAUS Pioneer PX Analytical balance that state will be used in year 2 of the event. Is this yr 2? We are new to the competition and do not know which yr of this event we are entering. Thanks for your help.	There will be a new version of the lab event posted by the end of January. For 2026 we will not be using the balance or the 50 gram weight.	1/6/26