Water Operator Certification Study Material (
New Mexico) (Basic) Study Material for water
operator cerification level 1 & 2 in New Mexico
170 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) ALREADY GRADED A+ 2025 NEW
UPDATE
___ or less than 5% bacteriological samples must be taken every month before a
system is allowed to have TWO positive samples without violating the drinking water
standard? - CORRECT ANSWER: 40
A excavation over ___ feet deep must have a ladder for access - CORRECT ANSWER:
4
A good application for a peristaltic pump - CORRECT ANSWER: Chemical feed pump
A physical & Chemical reaction occurring which results in the formation of insoluable
solids (Floc) which settles - CORRECT ANSWER: Coagulation
Action level for copper. ___ mg/l - CORRECT ANSWER: 1.3
Action level for Lead ___ mg/l - CORRECT ANSWER: 0.015
Additional piece of equipment needed to feed liquefied chlorine gas from a ton cylinder -
CORRECT ANSWER: Evaporator
All vents and overflows on a storage tank should be - CORRECT ANSWER: Screened
,An attachment to the well casing to provide a sanitary seal between the well casing and
the effluent line - CORRECT ANSWER: Pitless adapter
Any person responsible for the operation of all or any portion of a water supply system
or wastewater facility - CORRECT ANSWER: Operator
Anytime the MCL is exceeded and fecal coliform positive results come back from any of
the samples - CORRECT ANSWER: Non-acute violation
At what temperature does the designed fusible plugs melt? ___ F - CORRECT
ANSWER: 157
Average detention time for flocculation process in minutes - CORRECT ANSWER: 30 -
60
Bacteria that are found only in surface water supplies - CORRECT ANSWER:
Cryptosporidium & Giardia
Bacteriological sampling results be kept ___ years - CORRECT ANSWER: 5
Byprouducts of drinking water chlorination. these byprouducts form when chlorine
reacts with dissolved natural organic matter, moslty plant life - CORRECT ANSWER:
Trihalomethanes
Can be used as an initial check of coupling alignment - CORRECT ANSWER: Straight
edge
Cause problems with liver, kidney, central nervous systems, may increase cancer risk
and have possible reprouductive health risks - CORRECT ANSWER: Trihalomethanes
, Caused by closing a valve too quickly - CORRECT ANSWER: Water hammer
Chemical sampling results be kept ___ years - CORRECT ANSWER: 10
Chemical used to kill algae in a lake - CORRECT ANSWER: Copper sulphate
Chemical violation records must be kept ___ years - CORRECT ANSWER: 10
Chemicals used as sources of fluoride - CORRECT ANSWER: Sodium silicofluoride and
hydrofluorosilic acid
Chlorine gas flexible feed tubes should be replaced every ___ months - CORRECT
ANSWER: 6
Chlorine gas is _____ times heavier than air. - CORRECT ANSWER: 2.5
Chlorine is ___ times heavier than water - CORRECT ANSWER: 1.5
Coliform group - CORRECT ANSWER: Indicator organism
Commonly found in the environment (soil, vegetation) and are generally harmless -
CORRECT ANSWER: Coliform bacteria
Compliance sampling will either occur at - CORRECT ANSWER: Point of entry or point
of use
Component in a diaphragm pump causes the most maintenance problems - CORRECT
ANSWER: Check valves
New Mexico) (Basic) Study Material for water
operator cerification level 1 & 2 in New Mexico
170 QUESTIONS AND CORRECT DETAILED
ANSWERS WITH RATIONALES (VERIFIED
ANSWERS) ALREADY GRADED A+ 2025 NEW
UPDATE
___ or less than 5% bacteriological samples must be taken every month before a
system is allowed to have TWO positive samples without violating the drinking water
standard? - CORRECT ANSWER: 40
A excavation over ___ feet deep must have a ladder for access - CORRECT ANSWER:
4
A good application for a peristaltic pump - CORRECT ANSWER: Chemical feed pump
A physical & Chemical reaction occurring which results in the formation of insoluable
solids (Floc) which settles - CORRECT ANSWER: Coagulation
Action level for copper. ___ mg/l - CORRECT ANSWER: 1.3
Action level for Lead ___ mg/l - CORRECT ANSWER: 0.015
Additional piece of equipment needed to feed liquefied chlorine gas from a ton cylinder -
CORRECT ANSWER: Evaporator
All vents and overflows on a storage tank should be - CORRECT ANSWER: Screened
,An attachment to the well casing to provide a sanitary seal between the well casing and
the effluent line - CORRECT ANSWER: Pitless adapter
Any person responsible for the operation of all or any portion of a water supply system
or wastewater facility - CORRECT ANSWER: Operator
Anytime the MCL is exceeded and fecal coliform positive results come back from any of
the samples - CORRECT ANSWER: Non-acute violation
At what temperature does the designed fusible plugs melt? ___ F - CORRECT
ANSWER: 157
Average detention time for flocculation process in minutes - CORRECT ANSWER: 30 -
60
Bacteria that are found only in surface water supplies - CORRECT ANSWER:
Cryptosporidium & Giardia
Bacteriological sampling results be kept ___ years - CORRECT ANSWER: 5
Byprouducts of drinking water chlorination. these byprouducts form when chlorine
reacts with dissolved natural organic matter, moslty plant life - CORRECT ANSWER:
Trihalomethanes
Can be used as an initial check of coupling alignment - CORRECT ANSWER: Straight
edge
Cause problems with liver, kidney, central nervous systems, may increase cancer risk
and have possible reprouductive health risks - CORRECT ANSWER: Trihalomethanes
, Caused by closing a valve too quickly - CORRECT ANSWER: Water hammer
Chemical sampling results be kept ___ years - CORRECT ANSWER: 10
Chemical used to kill algae in a lake - CORRECT ANSWER: Copper sulphate
Chemical violation records must be kept ___ years - CORRECT ANSWER: 10
Chemicals used as sources of fluoride - CORRECT ANSWER: Sodium silicofluoride and
hydrofluorosilic acid
Chlorine gas flexible feed tubes should be replaced every ___ months - CORRECT
ANSWER: 6
Chlorine gas is _____ times heavier than air. - CORRECT ANSWER: 2.5
Chlorine is ___ times heavier than water - CORRECT ANSWER: 1.5
Coliform group - CORRECT ANSWER: Indicator organism
Commonly found in the environment (soil, vegetation) and are generally harmless -
CORRECT ANSWER: Coliform bacteria
Compliance sampling will either occur at - CORRECT ANSWER: Point of entry or point
of use
Component in a diaphragm pump causes the most maintenance problems - CORRECT
ANSWER: Check valves
