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Texas Class D Water Distribution study guide Questions & Answers
What is the name of the State Agency responsible for enforcing the Safe Drinking Water Act? - ANSWERSTexas Commission on Environmental Quality 
 
what Minerals are associated with water hardness? - ANSWERSCalcium and magnesium 
 
A public water system MUST at all times provide? 
A. Adequate quantity of water 
B. Adequate water pressure 
c. Adequate disinfection 
D. All of the above - ANSWERSD. All of the above 
 
A Source of groundwater would be? - ANSWERSAquifer 
 
Fecal Coliform organisms s...
- Exam (elaborations)
- • 6 pages •
What is the name of the State Agency responsible for enforcing the Safe Drinking Water Act? - ANSWERSTexas Commission on Environmental Quality 
 
what Minerals are associated with water hardness? - ANSWERSCalcium and magnesium 
 
A public water system MUST at all times provide? 
A. Adequate quantity of water 
B. Adequate water pressure 
c. Adequate disinfection 
D. All of the above - ANSWERSD. All of the above 
 
A Source of groundwater would be? - ANSWERSAquifer 
 
Fecal Coliform organisms s...
Water Treatment D study guide Questions & Answers
A watercourse that flows continuously at all times of the year is called? - ANSWERSPerennial stream. 
 
During the night, algae causes the pH of the water to? - ANSWERSDecrease 
 
which of the following contributes to the creation of algae blooms? - ANSWERSIncreased nutrients 
 
Which of the following is found mainly in groundwater sources and forms a precipitate when oxidized? - ANSWERSIron 
 
The Riparian Doctrine is something called the? - ANSWERSRule of Reasonable Sharing 
 
Which of the fol...
- Exam (elaborations)
- • 3 pages •
A watercourse that flows continuously at all times of the year is called? - ANSWERSPerennial stream. 
 
During the night, algae causes the pH of the water to? - ANSWERSDecrease 
 
which of the following contributes to the creation of algae blooms? - ANSWERSIncreased nutrients 
 
Which of the following is found mainly in groundwater sources and forms a precipitate when oxidized? - ANSWERSIron 
 
The Riparian Doctrine is something called the? - ANSWERSRule of Reasonable Sharing 
 
Which of the fol...
Waste Water D license Study Questions & Answers
Water Resources in Texas includes lakes, rivers, bays, estuaries, wetlands, ground water, and storm (1-3) - ANSWERSFalse 
 
Water Polluntants include organic and inorganic material, heat, and radiation (1-4) - ANSWERSTrue 
 
In Texas, Clean water is needed to provide for human comsumption and recreation, Maintain aquatic habitats for wildlife, recharge ground water, and provide for industry. (1-4) - ANSWERSFalse 
 
Two sources of water contamination are discharges and non- point source discharge...
- Exam (elaborations)
- • 23 pages •
Water Resources in Texas includes lakes, rivers, bays, estuaries, wetlands, ground water, and storm (1-3) - ANSWERSFalse 
 
Water Polluntants include organic and inorganic material, heat, and radiation (1-4) - ANSWERSTrue 
 
In Texas, Clean water is needed to provide for human comsumption and recreation, Maintain aquatic habitats for wildlife, recharge ground water, and provide for industry. (1-4) - ANSWERSFalse 
 
Two sources of water contamination are discharges and non- point source discharge...
Drinking Water Operator Certification Limited Treatment (D-Level) Practice Exam Questions & Answers
Mortar Lining - ANSWERSType of physical barriers that can be placed in ductile iron pipes to reduce corrosion control 
 
Orthophosphates - ANSWERSused as a corrosion inhibitor 
 
atmospheric vacuum breaker - ANSWERStype of backflow preventer is typically found on laboratory sinks 
 
chloramines - ANSWERSconsidered a combined chlorine 
 
yellow - ANSWERScolor is gas chlorine 
 
20.41 Gallons - ANSWERSa water system treats 4.1 mgd and wishes to maintain a chlorine residual of 0.7 ppm how many gall...
- Exam (elaborations)
- • 4 pages •
Mortar Lining - ANSWERSType of physical barriers that can be placed in ductile iron pipes to reduce corrosion control 
 
Orthophosphates - ANSWERSused as a corrosion inhibitor 
 
atmospheric vacuum breaker - ANSWERStype of backflow preventer is typically found on laboratory sinks 
 
chloramines - ANSWERSconsidered a combined chlorine 
 
yellow - ANSWERScolor is gas chlorine 
 
20.41 Gallons - ANSWERSa water system treats 4.1 mgd and wishes to maintain a chlorine residual of 0.7 ppm how many gall...
Water Treatment Class D( Practice Exam #3) Questions & Answers
What is the criteria for a community water system? - ANSWERSHas at least 15 service connections used by all year residents,or regularly serves at least 25 all yesr residents 
 
What is the acceptable limit of copper in drinking water? - ANSWERS1.3 mg/L 
 
Which type of reservoir is rich in nutrients? - ANSWERSeutrophic 
 
What is a mechanical seal? - ANSWERSMetallic flat surfaces used to minimize leakage around the pump shaft. 
 
What is a confined aquifer? - ANSWERSAn aquifer that is bounded ab...
- Exam (elaborations)
- • 6 pages •
What is the criteria for a community water system? - ANSWERSHas at least 15 service connections used by all year residents,or regularly serves at least 25 all yesr residents 
 
What is the acceptable limit of copper in drinking water? - ANSWERS1.3 mg/L 
 
Which type of reservoir is rich in nutrients? - ANSWERSeutrophic 
 
What is a mechanical seal? - ANSWERSMetallic flat surfaces used to minimize leakage around the pump shaft. 
 
What is a confined aquifer? - ANSWERSAn aquifer that is bounded ab...
Water Treatment Operator Exam Class C and D Questions & Answers
Always _____ a piece of equipment before attempting a repair - ANSWERSLockout/Tagout 
 
Never Tamper with a ____ on a chlorine cylinder - ANSWERSfusible plug 
 
Chlorine gas is _____ times heavier than air. - ANSWERS2.5 
 
one volume of liquid chlorine produces ____ Volumes of gaseous chlorine under pressure - ANSWERS460 
 
Always Change the ______ when changing a chlorine cylinder - ANSWERSLead Washer 
 
Always first _________ to a chlorine cylinder before changing the cylinder - ANSWERSturn of...
- Exam (elaborations)
- • 2 pages •
Always _____ a piece of equipment before attempting a repair - ANSWERSLockout/Tagout 
 
Never Tamper with a ____ on a chlorine cylinder - ANSWERSfusible plug 
 
Chlorine gas is _____ times heavier than air. - ANSWERS2.5 
 
one volume of liquid chlorine produces ____ Volumes of gaseous chlorine under pressure - ANSWERS460 
 
Always Change the ______ when changing a chlorine cylinder - ANSWERSLead Washer 
 
Always first _________ to a chlorine cylinder before changing the cylinder - ANSWERSturn of...
Wastewater D License Exam Questions & Answers
How many PPB equals one PPM? - ANSWERSOne thousand parts per billion equals one part per million 
 
If the bubbler system air supply line at the wet well is clogged, what will this cause the pump to do? - ANSWERSPressure build up in the supply line would signal more water column then there really was, causing the pump to run longer than necessary, possibly not kick off and run continually 
 
If the bubbler system air supply line at the wet well has a hole in it above the water level, what will t...
- Exam (elaborations)
- • 21 pages •
How many PPB equals one PPM? - ANSWERSOne thousand parts per billion equals one part per million 
 
If the bubbler system air supply line at the wet well is clogged, what will this cause the pump to do? - ANSWERSPressure build up in the supply line would signal more water column then there really was, causing the pump to run longer than necessary, possibly not kick off and run continually 
 
If the bubbler system air supply line at the wet well has a hole in it above the water level, what will t...
Wastewater Operator Class D Questions & Answers
hydrologic cycle - ANSWERSThe natural exchange of water between the earth and the air 
 
Evaporation - ANSWERS______________ causes surface water to enter the atmosphere and begin the Hydrologic Cycle 
 
Precipitation - ANSWERSRain or snow falling from the clouds 
 
Condensation - ANSWERSwhat causes water vapor to form clouds 
 
Groundwater sources - ANSWERSgenerally better protected from contamination than surface water sources 
 
Goal of wastewater systems and wastewater operators - ANSWERSto ...
- Exam (elaborations)
- • 34 pages •
hydrologic cycle - ANSWERSThe natural exchange of water between the earth and the air 
 
Evaporation - ANSWERS______________ causes surface water to enter the atmosphere and begin the Hydrologic Cycle 
 
Precipitation - ANSWERSRain or snow falling from the clouds 
 
Condensation - ANSWERSwhat causes water vapor to form clouds 
 
Groundwater sources - ANSWERSgenerally better protected from contamination than surface water sources 
 
Goal of wastewater systems and wastewater operators - ANSWERSto ...
Water TEST D Texas Questions & Answers
The water utility field affects everyone because ________. - ANSWERSwater is essential to life and health 
 
The water utility employee should remember customers are entitled to ________. - ANSWERScourteous treatment and answers to questions about water 
 
In Texas, water operator licensing is administered by the ________. - ANSWERSTCEQ 
 
All public water systems are required to employ licensed operators even if the system only________ treated water bought from another source. - ANSWERSredistri...
- Exam (elaborations)
- • 9 pages •
The water utility field affects everyone because ________. - ANSWERSwater is essential to life and health 
 
The water utility employee should remember customers are entitled to ________. - ANSWERScourteous treatment and answers to questions about water 
 
In Texas, water operator licensing is administered by the ________. - ANSWERSTCEQ 
 
All public water systems are required to employ licensed operators even if the system only________ treated water bought from another source. - ANSWERSredistri...
Water distribution practice test D1 /D2 Questions & Answers
The only absolutely reliable method of backflow prevention is the use of - ANSWERSAir Gap 
 
The bubbles formed in a positive multiple tube fermentation test are - ANSWERSCarbon Dioxide 
 
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is - ANSWERS40 lbs 
 
If you encounter a liquid chlorine leak in a one tone container, what action should you take first, to reduce the severity of the leak? - ANSWERSRotate the container to place the leak at the top 
 
The most c...
- Exam (elaborations)
- • 4 pages •
The only absolutely reliable method of backflow prevention is the use of - ANSWERSAir Gap 
 
The bubbles formed in a positive multiple tube fermentation test are - ANSWERSCarbon Dioxide 
 
The maximum rate of withdrawal of gas from a 150lb chlorine cylinder in 24-hours is - ANSWERS40 lbs 
 
If you encounter a liquid chlorine leak in a one tone container, what action should you take first, to reduce the severity of the leak? - ANSWERSRotate the container to place the leak at the top 
 
The most c...