IOWA Grade 1 Water Distribution Certification
Latest Practice Test 2026 with 200 Questions and
Correct Answers/ State of Iowa Grade 1 Water
Distribution Practice Exam 2026-2027 (new!)
How much leakage is allowed for a new pipeline test? - ANSWER-the amount is
given in AWWA standards and manuals
Which type of valve should be installed at a dead-end water main?
a. vacuum valve
b. air valve
c. blowoff valve
d. pressure-relief valve - ANSWER-c
How must a pipeline be prepared before a sample is taken for bacteriological
testing? - ANSWER-the pipeline must be flushed of chlorinated water and refilled
with from the system
What term refers to the process of repeatedly pushing a pressurized water pipe
vertically to near the bottom of the loose fill at intervals along the excavation? -
ANSWER-jetting
A corporation stop is used for a
a. service line
b. pump discharge line
c. tank inlet
1
,d. tank outlet - ANSWER-a
Compression fittings used with copper or plastic tubing seal by means of
a. a beveled sleeve
b. a compression ring
c. a compressed beveled gasket
d. compressed O-rings located at either end of the fitting's beveled neck -
ANSWER-c
Water meter pits are usually used in
a. areas where flooding will most likely occur
b. areas where flooding is very rare
c. cold climates
d. hot climates - ANSWER-c
Which of the following is not and advantage of installing meters outside in boxes?
a. In areas where ground frost is nominal, a meter box can be relatively small,
inexpensive, and easy to install
b. if the boxes can always be readily located, meter boxes make meter reading
easier because meter readers do not have to enter a building
c. in areas where there is deep frost, meter pits are much more expensive to
construct
d. placing meters outside eliminates the need to enter buildings to replace the
meters, which is difficult in some inside locations - ANSWER-c
Other utilities will allow installation of a meter in a crawl space or utility closet as
long as (1) the meter can easily be accessed by a meter reader or (2)
2
,a. the meter is equipped with a remote reading device
b. the homeowner can easily access and report the meter readings
c. the meter can self-report to the utility
d. water fees in the area are fixed and readings are unnecessary - ANSWER-a
What may cause galvanized iron pipe to corrode excessively? - ANSWER-direct
connection to brass and other metal fittings
What is a curb stop used for? - ANSWER-turning off service for repair or as the
result of nonpayment
What is the typical service line size for a single-family residence? - ANSWER-
.75"
What is the term for the valve used to connect a small-diameter service line to a
water main? - ANSWER-corporation
What is generally considered the best location for a tap on a main? - ANSWER-at
an angle of about 45 degrees down from the top of the pipe
Which type of valve operates similar to a diaphragm valve?
a. vacuum relief valve
b. globe valve
c. pressure-relief valve
d. butterfly valve - ANSWER-b
Which type of valve can go from fully open to fully closed with a quarter turn?
3
, a. plug valve
b. needle valve
c. globe valve
d. pinch valve - ANSWER-a
Foot valves are a special type of
a. relief valve
b. control valve
c. check valve
d. plug valve - ANSWER-c
Which type of valve would be best to use to precisely throttle flow?
a. globe
b. butterfly
c. rotary
d. needle - ANSWER-d
Which type of valve is used to isolate a pump on the suction side
a. butterfly
b. globe
c. gate
d. ball - ANSWER-c
When fully opened, which valve will have the highest head loss?
4
Latest Practice Test 2026 with 200 Questions and
Correct Answers/ State of Iowa Grade 1 Water
Distribution Practice Exam 2026-2027 (new!)
How much leakage is allowed for a new pipeline test? - ANSWER-the amount is
given in AWWA standards and manuals
Which type of valve should be installed at a dead-end water main?
a. vacuum valve
b. air valve
c. blowoff valve
d. pressure-relief valve - ANSWER-c
How must a pipeline be prepared before a sample is taken for bacteriological
testing? - ANSWER-the pipeline must be flushed of chlorinated water and refilled
with from the system
What term refers to the process of repeatedly pushing a pressurized water pipe
vertically to near the bottom of the loose fill at intervals along the excavation? -
ANSWER-jetting
A corporation stop is used for a
a. service line
b. pump discharge line
c. tank inlet
1
,d. tank outlet - ANSWER-a
Compression fittings used with copper or plastic tubing seal by means of
a. a beveled sleeve
b. a compression ring
c. a compressed beveled gasket
d. compressed O-rings located at either end of the fitting's beveled neck -
ANSWER-c
Water meter pits are usually used in
a. areas where flooding will most likely occur
b. areas where flooding is very rare
c. cold climates
d. hot climates - ANSWER-c
Which of the following is not and advantage of installing meters outside in boxes?
a. In areas where ground frost is nominal, a meter box can be relatively small,
inexpensive, and easy to install
b. if the boxes can always be readily located, meter boxes make meter reading
easier because meter readers do not have to enter a building
c. in areas where there is deep frost, meter pits are much more expensive to
construct
d. placing meters outside eliminates the need to enter buildings to replace the
meters, which is difficult in some inside locations - ANSWER-c
Other utilities will allow installation of a meter in a crawl space or utility closet as
long as (1) the meter can easily be accessed by a meter reader or (2)
2
,a. the meter is equipped with a remote reading device
b. the homeowner can easily access and report the meter readings
c. the meter can self-report to the utility
d. water fees in the area are fixed and readings are unnecessary - ANSWER-a
What may cause galvanized iron pipe to corrode excessively? - ANSWER-direct
connection to brass and other metal fittings
What is a curb stop used for? - ANSWER-turning off service for repair or as the
result of nonpayment
What is the typical service line size for a single-family residence? - ANSWER-
.75"
What is the term for the valve used to connect a small-diameter service line to a
water main? - ANSWER-corporation
What is generally considered the best location for a tap on a main? - ANSWER-at
an angle of about 45 degrees down from the top of the pipe
Which type of valve operates similar to a diaphragm valve?
a. vacuum relief valve
b. globe valve
c. pressure-relief valve
d. butterfly valve - ANSWER-b
Which type of valve can go from fully open to fully closed with a quarter turn?
3
, a. plug valve
b. needle valve
c. globe valve
d. pinch valve - ANSWER-a
Foot valves are a special type of
a. relief valve
b. control valve
c. check valve
d. plug valve - ANSWER-c
Which type of valve would be best to use to precisely throttle flow?
a. globe
b. butterfly
c. rotary
d. needle - ANSWER-d
Which type of valve is used to isolate a pump on the suction side
a. butterfly
b. globe
c. gate
d. ball - ANSWER-c
When fully opened, which valve will have the highest head loss?
4
