Wastewater Collections Exam 2026/2027 – 30+ Questions & Answers | Sewer Systems, Pumps, Force Mains, Safety, I&I & Collection System Operations | TCEQ/TWUA

This Wastewater Collections 2026/2027 Exam study guide contains 30+ questions and answers across 17 pages covering essential concepts in wastewater collection system operation, design, construction, maintenance, pumping, sewer rehabilitation, and occupational safety. The material begins with collection-system design requirements such as wastewater force-main pressure ratings, gravity sewer pipe bedding, minimum structural life, projected service population, minimum air gaps, peak-to-daily-flow relationships, and collection-system licensing requirements. The document states a minimum structural life cycle of 50 years and discusses designing systems around population projections extending approximately 20–25 years into the future. A major section focuses on wastewater pumping and lift-station operations. Candidates review bubbler control systems, gate valves used to isolate pumps, pneumatic ejectors, centrifugal pumps, pump speed and horsepower relationships, frequent motor starts and stops, lead-pump float-switch positioning, and pressure sewer systems using residential grinder pumps. The guide identifies the centrifugal pump as the most common pump in the collection system and explains that bubbler controls detect changes through pressure variations. It also reviews the effects of a 25% centrifugal-pump speed increase on capacity, head, and required motor horsepower as presented in the source. The document provides concentrated review of sewer hydraulics, pipe selection, construction, and maintenance. Topics include minimum acceptable collection-system velocity, desirable flow velocity, drop manholes, gravity sewers, force mains, pipe material selection, internal and external forces, abrasion, industrial waste characteristics, infiltration exclusion, and septic conditions. Candidates also review common causes of sewer stoppages—identified in the guide as roots and grease—and proper use of high-velocity jet machines, including directing the hose and nozzle upstream from the downstream side. Another important section addresses inflow and infiltration (I&I), pretreatment, sewer evaluation, and rehabilitation. The material explains the purpose of a Sanitary Sewer Evaluation Survey (SSES) as a systematic examination of sewer systems or subsections demonstrating possible excessive inflow and infiltration, with the goal of identifying the location, flow rate, and correction costs associated with I&I problems. Pretreatment is presented as beneficial for protecting the publicly owned treatment works, workers, sludge quality, effluent, and the environment. Sewer rehabilitation content emphasizes documenting major collection-system components, evaluating system condition, and establishing rehabilitation goals. Safety and field operations are also emphasized. Questions cover construction warning-device spacing, overhead electrical power-line clearance, trench inspection and shoring, utility locating, designated top-person responsibilities, job-site supervision, carbon monoxide poisoning, excessive carbon dioxide exposure, and OSHA Hazard Communication requirements. The study guide lists headache, dizziness, drowsiness and additional neurological or systemic effects among carbon monoxide poisoning symptoms and discusses safe preparation before excavation. The guide additionally reviews wastewater characteristics and collection-system cleaning, including the appearance and odor of fresh sewage, problems associated with septic sludge, and hydraulic sewer-cleaning devices such as balls, kites, bags, and shielded scooters. Management questions address goal setting and participatory management, extending the document beyond technical operation into supervisory responsibilities relevant to wastewater collection personnel. Authoritative and academic references: The document itself references TWUA and TEEX wastewater collection materials and uses terminology associated with Texas wastewater operator requirements. Relevant technical references for further study include Texas Water Utilities Association (TWUA) wastewater collection training materials, Texas A&M Engineering Extension Service (TEEX) wastewater training resources, and applicable Texas Commission on Environmental Quality (TCEQ) wastewater operator and collection-system regulations. For broader industry reference, the Water Environment Federation (WEF), Operation of Wastewater Collection Systems is a widely relevant professional resource covering collection-system operation, maintenance, pumping, safety, sewer cleaning, and related wastewater infrastructure topics. Because the uploaded file contains notes such as “best guess,” “probably the correct answer,” incomplete answer choices, and an unidentified question on page 6, candidates should verify uncertain answers against current official training and regulatory materials rather than treating every response as independently validated. Relevant students: This document is particularly relevant for wastewater collection system operator candidates, wastewater operator certification students, TCEQ wastewater collection candidates, TWUA students, TEEX wastewater trainees, municipal wastewater employees, sewer maintenance personnel, lift-station operators, public works employees, wastewater utility technicians, and collection-system supervisors. It is especially useful for candidates reviewing sewer hydraulics, pumps, lift stations, force mains, gravity sewers, I&I, pretreatment, sewer cleaning, rehabilitation, construction safety, trench safety, and wastewater collection-system management. 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