TCEQ Class D Water Operators License questions and
answers with solutions 2025
Water Covers _______ of the earth's Surface - ANSWER 75%
Humans can only live ________ days without water - ANSWER 4-5 Days
Maximum Daily Demand can be determined - ANSWER From monthly operating reports or by
multiplying 2.4 times the average daily demand on the system.
130 - ANSWER Utilities that provide fire protection have to have a minimum of ____ Gallons per
person per day
75% - ANSWER Commercial, Industrial, and Agricultural Use makes up _____ % in Texas
57% - ANSWER Agricultural use accounts for _____% of total water consumed in Texas
97% - ANSWER _____% of the total volume of water available is saltwater
1% - ANSWER 3% of total volume of water available is considered fresh water. 2% is locked in
polar icecaps and glaciers. ____% of all water on earth is accessible fresh water.
Electrodialysis Reversal (EDR) - ANSWER Electrochemical separation process in which saline
water passes through alternately placed cations and anion membranes.
reverse osmosis - ANSWER A desalinization process that involves forcing salt-water through a
membrane permeable to water but not to salt
, 2000 - ANSWER Excluding outside use, the average household uses about _____ gallons of
water per month on inside use
True - ANSWER True or False: only about 1 gallon of tap water per person/day is used for
drinking and cooking
demand - ANSWER Monitoring average and maximum daily water _____ enables us to plan
ahead for growth.
potable - ANSWER suitable for drinking
Safe Drinking Water Act (1974) - ANSWER The federal regulation of drinking water is done by
the U.S. Environmental Protection Agency (EPA), which sets the drinking water quality standards
and enforces this standards through a federal law known as the
Public Water System - ANSWER Providing the public water for human consumption through
pipes or other constructed conveyances
Requirements of a public water system - ANSWER 1. Have at least 15 service connections or
2. Serve at least 25 individuals at least 60 days out of the year.
Community - ANSWER System has potential to serve at least 15 residential service connections
on a year-round basis or serve at least 25 full time residents on a year round basis.
nontransient noncommunity - ANSWER System serves at least 25 of the SAME people who do
not live at that location at least 6 months out of the year.
Transient non-community - ANSWER Public water system serves at least 25 persons of a
transient nature at least 60 days out of the year.
answers with solutions 2025
Water Covers _______ of the earth's Surface - ANSWER 75%
Humans can only live ________ days without water - ANSWER 4-5 Days
Maximum Daily Demand can be determined - ANSWER From monthly operating reports or by
multiplying 2.4 times the average daily demand on the system.
130 - ANSWER Utilities that provide fire protection have to have a minimum of ____ Gallons per
person per day
75% - ANSWER Commercial, Industrial, and Agricultural Use makes up _____ % in Texas
57% - ANSWER Agricultural use accounts for _____% of total water consumed in Texas
97% - ANSWER _____% of the total volume of water available is saltwater
1% - ANSWER 3% of total volume of water available is considered fresh water. 2% is locked in
polar icecaps and glaciers. ____% of all water on earth is accessible fresh water.
Electrodialysis Reversal (EDR) - ANSWER Electrochemical separation process in which saline
water passes through alternately placed cations and anion membranes.
reverse osmosis - ANSWER A desalinization process that involves forcing salt-water through a
membrane permeable to water but not to salt
, 2000 - ANSWER Excluding outside use, the average household uses about _____ gallons of
water per month on inside use
True - ANSWER True or False: only about 1 gallon of tap water per person/day is used for
drinking and cooking
demand - ANSWER Monitoring average and maximum daily water _____ enables us to plan
ahead for growth.
potable - ANSWER suitable for drinking
Safe Drinking Water Act (1974) - ANSWER The federal regulation of drinking water is done by
the U.S. Environmental Protection Agency (EPA), which sets the drinking water quality standards
and enforces this standards through a federal law known as the
Public Water System - ANSWER Providing the public water for human consumption through
pipes or other constructed conveyances
Requirements of a public water system - ANSWER 1. Have at least 15 service connections or
2. Serve at least 25 individuals at least 60 days out of the year.
Community - ANSWER System has potential to serve at least 15 residential service connections
on a year-round basis or serve at least 25 full time residents on a year round basis.
nontransient noncommunity - ANSWER System serves at least 25 of the SAME people who do
not live at that location at least 6 months out of the year.
Transient non-community - ANSWER Public water system serves at least 25 persons of a
transient nature at least 60 days out of the year.
