Download 2025-2026 TCEQ Class D Water Operator License Exam: 200 Questions and Answers and more Exams Operating Systems in PDF only on Docsity!
2025 - 2026 TCEQ CLASS D WATER OPERATOR
LICENSE EXAM |200 QUESTIONS AND
ANSWERS|GRADED A+
T/F: In Texas, about 75% of all water is used for commercial, industrial, or agricultural purposes. True Water covers approximately of Earth's surface. 71% Drought is an extended period when a region receives a deficiency in its water supply. atmospheric, ground, or surface T/F: Only about 1 gallon of tap water per person/day is used for drinking and cooking True Excluding outside water use, the average household uses about gallons of water per month for inside use 2, T/F: Only 3% of all the fresh water on earth can be easily accessed for use. False (only 1%) T/F: In 1978, the Texas Department of Health (TDH) assumed primacy over the
Safe Drinking Water Act from the EPA. True T/F: PWS officials should be pro-active in their approach to terrorism. True permits the owner of a well to pump as much water as desired, even if the water is drained from beneath the land of others. Rule of Capture In Texas, agricultural water demand accounts for about % of the total water used. 57% T/F: An example of a non-transient non-community PWS is a rural school. True Monitoring average and maximum daily water enables us to plan ahead for growth. Demand T/F: The Safe Drinking Water Act sets standards for drinking water including physical, chemical, bacteriological, and radiological characteristics.
The federal regulator of drinking water is the. EPA T/F: Duties of distribution operator include repairing leaks, making taps, flushing mains, and taking radiological samples. False (Repair leaks, Make taps, Flush mains, Operate pumps, Take bacteriological samples) A service area has 1000 service connections. What can we estimate the population of this service area to be? 3,000 (multiply connections x 3) T/F: The State must be notified after an existing facility is changed or after construction of a new facility. False (must notify before) T/F: A Class "D" license is valid for 2 years at ground and purchase water systems with 250 connections or less. False (3 years) T/F: The physical characteristics of water are color, taste, odor, temperature, and turbidity. True
An alkaline or basic solution has a pH greater than. 7 T/F: The terms mg/L and ppm are not interchangeable. False (they are interchangeable) Suspended solids in water cannot be filtered out. False (they can) Solids, water hardness, pH and gases are characteristics. Chemical T/F: There are 2 hydrogen atoms and 1 oxygen atom in each water molecule. True T/F: The State recommends a water pH of less than 7 to be maintained at all time. False (The state recommends a pH slightly greater than 7 and for the water to be non-corrosive.)
False (The state recommends 15 units of color or less for drinking water.) T/F: Examples of inorganic matter found in water include rock, sand, metals, and minerals. True T/F: The red color caused by iron is an example of suspended or apparent color and it can be removed by filtration. True Excessive calcium and are the primary cause of hardness in water. Magnesium T/F: The State recommends a maximum total dissolved solids content of 500 mg/L False (The state recommends that TDS not exceed 1000 mg/L) There are 3 common gases found in water: methane, carbon dioxide, and. hydrogen sulfide T/F: Turbidity must be limited because it shelters and nourishes bacteria and interferes with disinfection.
True T/F: Bleach or alcohol require less contact time than flaming to disinfect a faucet. False (flaming requires less contact time) T/F: The "primary limits" refer to chemicals with maximum contaminant levels that can be exceeded. False (refers to chemicals with maximum contaminant levels (MCLs) that CANNOT be exceeded.) T/F: The term "total coliform" means fecal and non-fecal coliform. True
Get the sample to the lab within or it will be rejected. 30 hours (for BacT samples) At 0.8 - 1.0 mg/L, fluoride reduces dental cavities, but in higher doeses (>2. mg/L) can cause of teeth over time. mottling T/F: One by-product of chlorinated drinking water is trihalomethane, a suspected carcinogen. True Repeat samples must be taken at (a) the (b) within 5 connections upstream and (c) within 5 connections downstream. positive point T/F: If you do not fill out the submission form completely, you risk losing credit for the sample. True T/F: The presence of fecal coliform in a water sample indicates fecal contamination from a human or warm-blooded animal. True
The purpose of the sample site plan is to assure bacteriological samples are collected from service connections which are representative of the distribution system. active T/F: Keep the sample in ice or in a cooler prior to and during lab transport because heat stimulates bacterial growth. True The action level for lead is mg/L and for copper it is mg/L. .015 / 1. T/F: Low doses of heavy metals such as lead and copper can cause damage to the central nervous system over time. True A certain group of bacteria is used to indicate the possible presence of a pathogen--- the group. Coliform Disinfection is the destruction of disease-causing microorganisms called. Pathogens At room temperature chlorine is a greenish-yellow gas that is times heavier than air. 2.
cylinders is lbs/day 40 T/F: Utility operators use chlorine in three commercial forms: pure chlorine in the liquid or gas state bleach solutions granular/tablet compounds True T/F: If chlorine contacts the skin, flush with an emergency shower or garden hose for at least an hour. False (15 minutes) Hypochlorous acid is the disinfectant and the residual. Free If a major chlorine leak occurs, call the supplier and. TCEQ The rotameter indicates the feed rate in per day pounds T/F: Chlorine reacts with hydrocarbons producing heat or fire
True Chlorinator rooms must be provided with facilities from determining the amount of disinfectant used daily T/F: Dosage is the amount of chlorine applied in milligrams per liter or parts per billion. False (parts per million) DPD reacts with chlorine producing a pink to color. red T/F: Residual is the amount of chlorine left after the demand is met. True (Dosage: How much Cl you put in the system, Demand: How much Cl is used by the system, Residual: How much Cl is left over) T/F: TCEQ requires a faucet for raw water sampling on the discharge pipe of each PWS well. True Permeability is the ability to water through the aquifer. transmit
T/F: Some artesian aquifer recharge areas (outcrop) are located many miles away from the well development site. True (Artesian Wells can be recharged from many miles away) A BacT sample, taken from a newly constructed well, on consecutive days, must show negative results. 3 Water in an aquifer is called water. ground T/F: A sanitary control easement covering land within 1500 feet of a public well must be recorded in county courthouse records. False (150 feet) The casing must extend at least inches above the floor of the pump room or ground surface. 18 T/F: Aquifers sandwiched between impermeable layers of rock or clay are called confined aquifers or artesian aquifers. True Three ways to measure water levels is the wetted tape, electric sounder, and the. airline (most often used)
A well drilled into a water table aquifer is usually a well. Shallow Abandoned wells, not plugged, within mile of a proposed well site must be reported to TCEQ. 1/ The State requires wells be protected by - fences or locked well houses. Intruder-resistant Groundwater is usually clear and void of. bacteria TCEQ defines "complete treatment" as the following sequence of processes: pretreatment disinfection, taste and odor control, continuous coagulation, filtration, sedimentation, terminal disinfection, and covered storage. False (1. Pretreatment disinfection Taste and odor control Continuous coagulation Sedimentation Filtration Terminal disinfection Covered storage)
False (1250 miles) T/F: Filtration is the first step in the removal of suspended solids. False (Sedimentation) Surface water is usually low in and. minerals / gases Chemical dosage, water temperature, pH, , and the characteristics of the raw water all have an effect on the coagulation process. mixing The two pathogenic protozoans resistant to chlorination are: and giardia / cryptosporidium T/F: Bacteria, algae, and turbidity can be a problem in surface water as can be municipal, industrial and agricultural pollution. True T/F: Coagulation works by the bonding of negatively charged turbidity to positively charged chemical coagulants. True
T/F: Turbidity can shelter bacteria from the disinfection process. True is the last treatment step before storage. Disinfection T/F: Treated water is stored at the plant in a tank called a clear well. True The process of separating floc from water by gravity is called: sedimentation Filtration is the last barrier between the public and or. giardia / cryptosporidium T/F: If the media collects in the wash water troughs, the wash rate is too high. True T/F: A check valve located on the discharge side of a pump is an isolating valve that allows water to flow one direction only. False (it is a controlling valve) T/F: The total dynamic head a pump must overcome is the distance from the water level on the suction side of the pump to the top of the water level on the discharge side of the pump and includes any friction and head loss encountered. True Dead-end mains must be provided with Flush valves
