WATER TREATMENT FINAL EXAM
QUESTIONS WITH 100% CORRECT
ANSWERS L LATEST VERSION 2025/2026.
Whats a rapid method of estimating total dissolved content of a water supply? - ANS Specific
conductance
Waterfall aeration devices may cause what type of problems? - ANS Encourage biological
growth
If a person is poisoned by inhaling fluoride what is the first symptom? - ANS Sharp biting pain
to the nose followed by a runny nose or a nose bleed
Drinking water waste is considered what type of waste? - ANS Industrial
pH kept at ____ will precipitate calcium carbonate? - ANS 10
Excess pink water can be caused by what? - ANS Potassium permanganate overdose
Pressure in a distribution system should not fall below what level? - ANS 20psi
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is the MCL for Trihalomethanes - ANS 0.08 milligrams per liter
Shortened filter runs can occur because of air bound filters, why is this? - ANS Caused by the
release of dissolved air in saturated cold water due to a decrease in pressure
What is the most expensive aeration device? - ANS Mechanical
In the Ion exchange process, calcium(Ca) and magnesium(Mg) Ions are exchanged for what? -
ANS Na- Ions
What are the four stages of the operation of an ion exchange softener? - ANS Service, Brine,
Backwash, Rinse
What is the chief cause of accidents? - ANS Carelessness/ negligence
Drinking water should be free of what 2 things? - ANS Bacteria and toxins
Ton tanks have how many fusible metal safety plugs on each ends? - ANS 3 to 4- each side
If you have positive sample for total coliform, do what? - ANS Repeat samples are required
(3) tap upstream and downstream
Filters are clogged by what, that can cause head loss? - ANS Algae/ aquatic micro organisms
What is the meaning of eutrophic - ANS High nutrient content
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
QUESTIONS WITH 100% CORRECT
ANSWERS L LATEST VERSION 2025/2026.
Whats a rapid method of estimating total dissolved content of a water supply? - ANS Specific
conductance
Waterfall aeration devices may cause what type of problems? - ANS Encourage biological
growth
If a person is poisoned by inhaling fluoride what is the first symptom? - ANS Sharp biting pain
to the nose followed by a runny nose or a nose bleed
Drinking water waste is considered what type of waste? - ANS Industrial
pH kept at ____ will precipitate calcium carbonate? - ANS 10
Excess pink water can be caused by what? - ANS Potassium permanganate overdose
Pressure in a distribution system should not fall below what level? - ANS 20psi
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, What is the MCL for Trihalomethanes - ANS 0.08 milligrams per liter
Shortened filter runs can occur because of air bound filters, why is this? - ANS Caused by the
release of dissolved air in saturated cold water due to a decrease in pressure
What is the most expensive aeration device? - ANS Mechanical
In the Ion exchange process, calcium(Ca) and magnesium(Mg) Ions are exchanged for what? -
ANS Na- Ions
What are the four stages of the operation of an ion exchange softener? - ANS Service, Brine,
Backwash, Rinse
What is the chief cause of accidents? - ANS Carelessness/ negligence
Drinking water should be free of what 2 things? - ANS Bacteria and toxins
Ton tanks have how many fusible metal safety plugs on each ends? - ANS 3 to 4- each side
If you have positive sample for total coliform, do what? - ANS Repeat samples are required
(3) tap upstream and downstream
Filters are clogged by what, that can cause head loss? - ANS Algae/ aquatic micro organisms
What is the meaning of eutrophic - ANS High nutrient content
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
