WA Water/Wastewater Operator case studies
WA Water/Wastewater Operator · Put your knowledge to work in context.
The Washington Water/Wastewater Operator certification is a state credential that documents the competence of people who operate drinking water treatment, drinking water distribution, wastewater treatment, and wastewater collection systems. Operators earn certificates at progressive levels, and the level you hold generally determines the size and complexity of the system you may operate without direct supervision. Candidates typically include entry-level utility staff, maintenance and field workers moving into operations, and experienced operators advancing to a higher class. The examination is multiple choice and blends calculation, process-control reasoning, and regulatory knowledge. Topics on this exam: Source Water and Water Quality, Treatment Processes, Distribution Systems, Collection Systems, Pumps, Motors, and Mechanical Equipment, Disinfection and Chemical Feed, Laboratory Analysis and Process Control, and Safety, Regulations, and Recordkeeping. The WA Water/Wastewater Operator case studies are 5 cases and about 2,563 words.
1Coliform Hit After Main Break Repair
A 12-inch ductile iron main on a dead-end street serves 40 connections. Crews repaired a circumferential crack at 2 a.m.
593 words, about 3 min2Filter Run Collapse on a Rising Head
A conventional rapid sand filter has been running 38 hours. Head loss has climbed from 2.1 ft to 7.4 ft, and effluent turbidity rose from 0.08 NTU to 0.42 NTU over the last four hours.
536 words, about 3 min3Pump Cavitation After a Wet-Well Drawdown
A vertical turbine pump in a 20-foot-deep wet well has begun making a rattling, gravelly noise and vibrating. Discharge pressure fluctuates about 8 psi.
469 words, about 2 min4Grease Blockage and a SSO Decision
A 10-inch gravity sewer runs along a creek. During a heavy rain, a maintenance crew finds sewage surfacing from a manhole into a grassy ditch that drains to the creek about 150 feet away.
489 words, about 2 min5Chlorine Residual Drop Across a Long Dead-End Main
A system feeds chlorinated water from a plant at 1.2 mg/L free residual. A 4,000-foot, 8-inch dead-end main serves a small neighborhood.
476 words, about 2 min