TCEQ MIDTERM EXAM WITH
QUESTIONS AND 100% CORRECT
ANSWERS, REVIEWED AND VERIFIED
BY EXPERT 2025 NEW UPDATE.
Fecal Coliform - ANS _____ ______ found in drinking water indicates the water is contaminated
with potentially pathogenic organisms that may be harmful
Hepatitis, typhoid, cholera, and dysentery are all waterborne diseases that are preventable with
proper disinfection. - ANS Hepatitis, typhoid, ______, and _________ are all waterborne
diseases that are preventable with proper disinfection.
Calcium Hypochlorite is a solid form of chlorine that is used by some small water systems to
maintain a chlorine residual. - ANS ______ ______ is a solid form of chlorine that is used by
some small water systems to maintain a chlorine residual.
The chlorine demand represents the amount of chlorine used by reducing agents and other
impurities before a chlorine residual is formed. - ANS The chlorine _______ represents the
amount of chlorine used by reducing agents and other impurities before a chlorine residual is
formed.
Disinfection is commonly referred to as the most important water treatment process. - ANS
__________ is commonly referred to as the most important water treatment process.
The main component of a hypo-chlorination system is a solution feed pump. - ANS The main
component of a hypo-chlorination system is a ________ ________ pump.
Components of a chlorine gas feed system include a steel chlorine cylinder, scale and rotameter.
- ANS Components of a chlorine gas feed system include a steel chlorine cylinder, ______, and
________.
Under non-emergency conditions, the chlorine residual for disinfecting new or repaired water
main is ___ mg/L. - ANS Under non-emergency conditions, the chlorine residual for disinfecting
new or repaired water main is 50 mg/L.
Under emergency conditions, TCEQ allows water main disinfection to be accomplished with a
500 mg/L chlorine dose for 30 minutes. - ANS Under emergency conditions, TCEQ allows water
main disinfection to be accomplished with a ____ mg/L chlorine dose for ___ minutes.
Most Calcium Hypochlorite (HTH) contains about 65% available chlorine. - ANS Most Calcium
Hypochlorite (HTH) contains about ___% available chlorine.
, Chlorine dosage is the combination of demand plus the desired residual. - ANS Chlorine dosage
is the combination of demand plus the desired _______.
The point at which all organic compounds, ammonia, and reducing agents have reacted with the
chlorine dose is called the Breakpoint. - ANS The point at which all organic compounds,
ammonia, and reducing agents have reacted with the chlorine dose is called the ________.
After flushing and disinfecting newly installed water line, a bacteriological sample should be
collected every 1,000 feet along the new water main. - ANS After flushing and disinfecting
newly installed water line, a bacteriological sample should be collected every _____ feet along
the new water main.
Cryptosporidium is very resistant to chlorine disinfection. - ANS _____________ is very
resistant to chlorine disinfection.
1 MGD = 694.4 gpm - ANS 1 MGD = _____ gpm
1 foot = 0.433 psi - ANS 1 MGD = 694.4 gpm
2.31 feet = 1 psi - ANS ____ feet = 1 psi
1 mile = 5,280 feet - ANS 1 mile = ______ feet
Volume, gal = 0.785 x D x D x Depth x 7.48 7.48 gal/cu ft - ANS _________ = 0.785 x D x D x
Depth x 7.48 gal/cu ft
Volume, gal = L x W x D x 7.48 gal/cu ft - ANS Volume, gal = 0.785 x D x D x Depth x 7.48
7.48 gal/cu ft
Drawdown, ft = Pumping Water Level, ft - Static Water Level, ft - ANS __________ = Pumping
Water Level, ft - Static Water Level, ft
Pounds Chlorine = Pounds at 100% ÷ % Available Free Chlorine Ex: Pounds of 65% HTH = 10
lb Cl2 gas ÷ 0.65 = 15.4 lb HTH - ANS What is the formula to convert pounds of 100% chlorine
gas to pounds of 65% HTH?
Dose, mg/L = Demand, mg/L + Residual, mg/L - ANS _________ = Demand, mg/L + Residual,
mg/L
lb/day = (Flow, MGD) x (Dose, mg/L) x 8.34 - ANS What is the formula for calculating pounds
per day (lb/day) of chlorine?
An aquifer is a porous, underground formation that is capable of delivering large quantities of
water. - ANS An _______ is a porous, underground formation that is capable of delivering large
quantities of water.
QUESTIONS AND 100% CORRECT
ANSWERS, REVIEWED AND VERIFIED
BY EXPERT 2025 NEW UPDATE.
Fecal Coliform - ANS _____ ______ found in drinking water indicates the water is contaminated
with potentially pathogenic organisms that may be harmful
Hepatitis, typhoid, cholera, and dysentery are all waterborne diseases that are preventable with
proper disinfection. - ANS Hepatitis, typhoid, ______, and _________ are all waterborne
diseases that are preventable with proper disinfection.
Calcium Hypochlorite is a solid form of chlorine that is used by some small water systems to
maintain a chlorine residual. - ANS ______ ______ is a solid form of chlorine that is used by
some small water systems to maintain a chlorine residual.
The chlorine demand represents the amount of chlorine used by reducing agents and other
impurities before a chlorine residual is formed. - ANS The chlorine _______ represents the
amount of chlorine used by reducing agents and other impurities before a chlorine residual is
formed.
Disinfection is commonly referred to as the most important water treatment process. - ANS
__________ is commonly referred to as the most important water treatment process.
The main component of a hypo-chlorination system is a solution feed pump. - ANS The main
component of a hypo-chlorination system is a ________ ________ pump.
Components of a chlorine gas feed system include a steel chlorine cylinder, scale and rotameter.
- ANS Components of a chlorine gas feed system include a steel chlorine cylinder, ______, and
________.
Under non-emergency conditions, the chlorine residual for disinfecting new or repaired water
main is ___ mg/L. - ANS Under non-emergency conditions, the chlorine residual for disinfecting
new or repaired water main is 50 mg/L.
Under emergency conditions, TCEQ allows water main disinfection to be accomplished with a
500 mg/L chlorine dose for 30 minutes. - ANS Under emergency conditions, TCEQ allows water
main disinfection to be accomplished with a ____ mg/L chlorine dose for ___ minutes.
Most Calcium Hypochlorite (HTH) contains about 65% available chlorine. - ANS Most Calcium
Hypochlorite (HTH) contains about ___% available chlorine.
, Chlorine dosage is the combination of demand plus the desired residual. - ANS Chlorine dosage
is the combination of demand plus the desired _______.
The point at which all organic compounds, ammonia, and reducing agents have reacted with the
chlorine dose is called the Breakpoint. - ANS The point at which all organic compounds,
ammonia, and reducing agents have reacted with the chlorine dose is called the ________.
After flushing and disinfecting newly installed water line, a bacteriological sample should be
collected every 1,000 feet along the new water main. - ANS After flushing and disinfecting
newly installed water line, a bacteriological sample should be collected every _____ feet along
the new water main.
Cryptosporidium is very resistant to chlorine disinfection. - ANS _____________ is very
resistant to chlorine disinfection.
1 MGD = 694.4 gpm - ANS 1 MGD = _____ gpm
1 foot = 0.433 psi - ANS 1 MGD = 694.4 gpm
2.31 feet = 1 psi - ANS ____ feet = 1 psi
1 mile = 5,280 feet - ANS 1 mile = ______ feet
Volume, gal = 0.785 x D x D x Depth x 7.48 7.48 gal/cu ft - ANS _________ = 0.785 x D x D x
Depth x 7.48 gal/cu ft
Volume, gal = L x W x D x 7.48 gal/cu ft - ANS Volume, gal = 0.785 x D x D x Depth x 7.48
7.48 gal/cu ft
Drawdown, ft = Pumping Water Level, ft - Static Water Level, ft - ANS __________ = Pumping
Water Level, ft - Static Water Level, ft
Pounds Chlorine = Pounds at 100% ÷ % Available Free Chlorine Ex: Pounds of 65% HTH = 10
lb Cl2 gas ÷ 0.65 = 15.4 lb HTH - ANS What is the formula to convert pounds of 100% chlorine
gas to pounds of 65% HTH?
Dose, mg/L = Demand, mg/L + Residual, mg/L - ANS _________ = Demand, mg/L + Residual,
mg/L
lb/day = (Flow, MGD) x (Dose, mg/L) x 8.34 - ANS What is the formula for calculating pounds
per day (lb/day) of chlorine?
An aquifer is a porous, underground formation that is capable of delivering large quantities of
water. - ANS An _______ is a porous, underground formation that is capable of delivering large
quantities of water.
