Illinois Class D Water License Latest Update
2025-2026 Exam 115 Questions with 100%
Verified Correct Answers Guaranteed A+
.019 MGD too gallons per day - CORRECT ANSWER: 19,000 gallons
.895 MGD too gallons per day - CORRECT ANSWER: 895,000 gallons
.999 MGD too gallons per day - CORRECT ANSWER: 999,000 gallons
1,245,000 gallons too million gallons per day (MGD) - CORRECT ANSWER: 1.245
MGD
2.20 MGD too gallons per day - CORRECT ANSWER: 2,200,000 gallons
678,000 gallons too million gallons per day (MGD) - CORRECT ANSWER: .678 MGD
9,500 gallons too million gallons per day (MGD) - CORRECT ANSWER: .0095 MGD
98,000 gallons too million gallons per day (MGD) - CORRECT ANSWER: .098 MGD
A 4 inch water main 5000 feet in length than to be flushed long enough to completely
change out the water in the main. How long would it take to completely fuss out this line
if the fire hydrant the end of the line is flowing at a rate of 325 gallons per minute? -
CORRECT ANSWER: 10 minutes
A 5/8" x 3/4" water meter serves a residence. Over a period of years the meter
__________ in recording actual water used - CORRECT ANSWER: Decreases
, A 6 inch PVC Watermain is installed what should be installed at the end of the main -
CORRECT ANSWER: Concrete thrusting block
A boil order must be issued if systems pressure drops below 20 psi or if contaminated of
any part of the system is suspected. Why? - CORRECT ANSWER: It is a regulation of
the IEPA, and to protect the health of water consumers
A boil order should be issued for? - CORRECT ANSWER: Until further notice
A circuit breaker is used to - CORRECT ANSWER: Automatically shut down on
electrical circuit is overloaded to prevent damage
A connection between a possible water supply and a non-potable water supply is? -
CORRECT ANSWER: A cross connection, a possible danger to water customers, and a
violation of state regulations
A device that is used to repair a cracked Watermain is? - CORRECT ANSWER: Split-
sleeve clamp
A distribution system that is "looped" instead of having dead ends will help prevent -
CORRECT ANSWER: Tastes and odors, "dirty" water, and chlorine depletion
A meter located in a mirror pit freezes in winter. what is the best option that the operator
has in thawing the line - CORRECT ANSWER: Use hot air heated obtained from the
tailpipe of a vehicle
A public water supply purchases 4,500,000 gallons of water from a parent supply in a 30
day period in the same period the public water supply sells 3,900,000 gallons of water
to its customers. What is the amount in gallons of unaccounted for water? What is the
percentage of an accounted for water? - CORRECT ANSWER: 600,000 gallons, 13.3%
2025-2026 Exam 115 Questions with 100%
Verified Correct Answers Guaranteed A+
.019 MGD too gallons per day - CORRECT ANSWER: 19,000 gallons
.895 MGD too gallons per day - CORRECT ANSWER: 895,000 gallons
.999 MGD too gallons per day - CORRECT ANSWER: 999,000 gallons
1,245,000 gallons too million gallons per day (MGD) - CORRECT ANSWER: 1.245
MGD
2.20 MGD too gallons per day - CORRECT ANSWER: 2,200,000 gallons
678,000 gallons too million gallons per day (MGD) - CORRECT ANSWER: .678 MGD
9,500 gallons too million gallons per day (MGD) - CORRECT ANSWER: .0095 MGD
98,000 gallons too million gallons per day (MGD) - CORRECT ANSWER: .098 MGD
A 4 inch water main 5000 feet in length than to be flushed long enough to completely
change out the water in the main. How long would it take to completely fuss out this line
if the fire hydrant the end of the line is flowing at a rate of 325 gallons per minute? -
CORRECT ANSWER: 10 minutes
A 5/8" x 3/4" water meter serves a residence. Over a period of years the meter
__________ in recording actual water used - CORRECT ANSWER: Decreases
, A 6 inch PVC Watermain is installed what should be installed at the end of the main -
CORRECT ANSWER: Concrete thrusting block
A boil order must be issued if systems pressure drops below 20 psi or if contaminated of
any part of the system is suspected. Why? - CORRECT ANSWER: It is a regulation of
the IEPA, and to protect the health of water consumers
A boil order should be issued for? - CORRECT ANSWER: Until further notice
A circuit breaker is used to - CORRECT ANSWER: Automatically shut down on
electrical circuit is overloaded to prevent damage
A connection between a possible water supply and a non-potable water supply is? -
CORRECT ANSWER: A cross connection, a possible danger to water customers, and a
violation of state regulations
A device that is used to repair a cracked Watermain is? - CORRECT ANSWER: Split-
sleeve clamp
A distribution system that is "looped" instead of having dead ends will help prevent -
CORRECT ANSWER: Tastes and odors, "dirty" water, and chlorine depletion
A meter located in a mirror pit freezes in winter. what is the best option that the operator
has in thawing the line - CORRECT ANSWER: Use hot air heated obtained from the
tailpipe of a vehicle
A public water supply purchases 4,500,000 gallons of water from a parent supply in a 30
day period in the same period the public water supply sells 3,900,000 gallons of water
to its customers. What is the amount in gallons of unaccounted for water? What is the
percentage of an accounted for water? - CORRECT ANSWER: 600,000 gallons, 13.3%
