Chitosan Enhanced Sand Filtration (CESF) Training Programs

Beginning April 1, 2007 all chitosan enhanced sand filtration operators must be trained by an Ecology-approved trainer.*

The following companies offer chitosan enhanced sand filtration operator training programs:


Clear Water Services
2525 West Casino Road Suite 7A
Everett, WA 98204
Phone: 425-412-5700
Fax: 425-265-9682


Water Tectonics
802 134th Street SW, Suite 110
Everett, WA 98204
Phone:  425-742-2062
Fax:  425-742-2453


Creative Courses, LLC
12320 NE 37th Street
Vancouver, WA 98682
Phone:  360-910-4800


Clear Creek Systems, Inc.
140 County Line Rd SW
Suite 101
Pacific, WA 98047
Phone: 661-324-9634


*For a list of trained operators, click here: Trained CESF Operator List. Operators identified in RED have expired certifications and must retake the classroom portion of the training program before working as an operator again.”