OWP will be closed from 4:00 pm on Friday, December 20, 2024, until 8:00 am on Thursday, January 2, 2025, for Winter Break.
(All times are PST.)
For students in Canada: Due to the ongoing Canada Post strike, please use UPS or FedEx to return your scantrons for grading. You may take your exams online even if you received paper exams.

If exams are submitted:	Course certificates will be mailed:
By December 13th	By December 20th
After December 20th	Early January

Please note: Postmark dates will not be honored.

Water and Wastewater Terms Beginning C

A B C D E F G H I J K L M N O P Q R S T U V W Y Z

COD (chemical oxygen demand) (pronounce as separate letters)

A measure of the oxygen-consuming capacity of the organic matter present in wastewater. COD is the amount of oxygen consumed in milligrams per liter during chemical reactions in a specific test. Results are not necessarily related to the BOD (biochemical oxygen demand) because the reactions may involve substances that bacteria do not stabilize.