Water Operator Certification Study
Material ( New Mexico) (Basic) questions and
answers with solutions 2025/2026
Maximum Contaminent Level - ANSWER MCL
Public water system is a system that serves a population of ___ or more
regularly - ANSWER 25
Maximum total chlorine residual ___ mg/l - ANSWER 4
What type of contaminant is Iron - ANSWER Secondary
Primary contaminant is sometimes added to water supplies to prevent
tooth decay - ANSWER Fluoride
The Failure of a public water system to comply with the NM Drinking
Water Regulations must be reported to NMED within ___ hours -
ANSWER 48
MCL for Total Trihalomethanes ___ mg/l - ANSWER 0.1
SDWA sampling results must be reported to - ANSWER New Mexico
Enviroment Department (NMED)
,Ground water systems must sample for inorganic chemicals every ___
years - ANSWER 3
The SDWA Compliance Cycle for Standardized Monitoring Rule consists
of ___ Compliance Periods - ANSWER 3
___ 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? - ANSWER 40
Action level for Lead ___ mg/l - ANSWER 0.015
If Bacteriological retakes are done this month what is the minimum
number of samples that must be turned in next month? - ANSWER 5
if a 3-log removal is required for Giardia Lamblia what percentage of
organisms can survive and still meet requirements - ANSWER 0.1
Primary Inorganic Contaminant poses an immediate health risk -
ANSWER Nitrates
The Presence of Nitrates in the bloodstream that reduces oxygen uptake
that gives the skin a blue tint - ANSWER Blue Baby Syndrome
, Primary Contaminant that shields harmful bacteria from disinfection
processes - ANSWER Turbidity
Device used to measure NTU's - ANSWER Nephelometer
Turbidity is Measured with - ANSWER Turbidimeter or Nephelometer
Chemical sampling results be kept ___ years - ANSWER 10
Bacteriological sampling results be kept ___ years - ANSWER 5
Microorganisms whose presence in water indicates probable presence of
pathogens. - ANSWER Indicator organism
White powder used to neutralize chlorine - ANSWER Sodium
Thiosulphate
To insure the water being sampled is from the main and not the
customers plumbling - ANSWER Flush line
Number is used to determine how many Bac-t samples must be taken -
ANSWER People served
Minimum number of Bac-T samples required each month? - ANSWER 1
Material ( New Mexico) (Basic) questions and
answers with solutions 2025/2026
Maximum Contaminent Level - ANSWER MCL
Public water system is a system that serves a population of ___ or more
regularly - ANSWER 25
Maximum total chlorine residual ___ mg/l - ANSWER 4
What type of contaminant is Iron - ANSWER Secondary
Primary contaminant is sometimes added to water supplies to prevent
tooth decay - ANSWER Fluoride
The Failure of a public water system to comply with the NM Drinking
Water Regulations must be reported to NMED within ___ hours -
ANSWER 48
MCL for Total Trihalomethanes ___ mg/l - ANSWER 0.1
SDWA sampling results must be reported to - ANSWER New Mexico
Enviroment Department (NMED)
,Ground water systems must sample for inorganic chemicals every ___
years - ANSWER 3
The SDWA Compliance Cycle for Standardized Monitoring Rule consists
of ___ Compliance Periods - ANSWER 3
___ 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? - ANSWER 40
Action level for Lead ___ mg/l - ANSWER 0.015
If Bacteriological retakes are done this month what is the minimum
number of samples that must be turned in next month? - ANSWER 5
if a 3-log removal is required for Giardia Lamblia what percentage of
organisms can survive and still meet requirements - ANSWER 0.1
Primary Inorganic Contaminant poses an immediate health risk -
ANSWER Nitrates
The Presence of Nitrates in the bloodstream that reduces oxygen uptake
that gives the skin a blue tint - ANSWER Blue Baby Syndrome
, Primary Contaminant that shields harmful bacteria from disinfection
processes - ANSWER Turbidity
Device used to measure NTU's - ANSWER Nephelometer
Turbidity is Measured with - ANSWER Turbidimeter or Nephelometer
Chemical sampling results be kept ___ years - ANSWER 10
Bacteriological sampling results be kept ___ years - ANSWER 5
Microorganisms whose presence in water indicates probable presence of
pathogens. - ANSWER Indicator organism
White powder used to neutralize chlorine - ANSWER Sodium
Thiosulphate
To insure the water being sampled is from the main and not the
customers plumbling - ANSWER Flush line
Number is used to determine how many Bac-t samples must be taken -
ANSWER People served
Minimum number of Bac-T samples required each month? - ANSWER 1
