WASTEWATER OPERATOR
CERTIFICATION STUDY GUIDE GRADE
1 EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
WasteWater Sources & Characteristics:
What is the most common reason for a wastewater to contain intermittent large amounts of
sand, gravel, and grit? - ANS storm events
WasteWater Sources & Characteristics:
Combined wastewater is defined as - ANS sanitary wastewater and stormwater runoff
WasteWater Sources & Characteristics:
In general, the solids content in wastewater is about - ANS 0.1%
WasteWater Sources & Characteristics:
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,In general, what is the % of suspended solids in the total amount of solids - ANS 30%
WasteWater Sources & Characteristics:
Generally, the % of dissolved solids in the amount of total solids is about - ANS 70%
WasteWater Sources & Characteristics:
Which type of organisms would most probably be associated with poor treatment or young
biomass - ANS amoebas
WasteWater Sources & Characteristics:
Which type of organisms would most probably be associated with very clear plant effluent. low
BOD and low amounts of suspended solids - ANS stalked cilates
Basic WasteWater Treatment:
Aerobic bacteria will reproduce and live in an environment that contains only - ANS oxygen
Basic WasteWater Treatment:
Anaerobic bacteria will reproduce and live only in an environment that completely lacks -
ANS free or dissolved oxygen
Basic WasteWater Treatment:
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, The biochemical oxygen demand (BOD) test usually has a specific time of - ANS 5 days
Basic WasteWater Treatment:
An Imhoff cone measures - ANS volume of settleable solids
Basic WasteWater Treatment:
Septic conditions are caused by - ANS anaerobic bacteria
Basic WasteWater Treatment:
Scum is usually removed in the _____treatment stage - ANS primary
Basic WasteWater Treatment:
When domestic wastewater enters natural waters, what species deplete most of the oxygen -
ANS aerobic bacteria
Basic WasteWater Treatment:
Once the oxygen is depleted in a natural body of water, which organisms take over? -
ANS anaerobic
Basic WasteWater Treatment:
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
CERTIFICATION STUDY GUIDE GRADE
1 EXAM QUESTIONS AND ANSWERS.
VERIFIED 2026.
WasteWater Sources & Characteristics:
What is the most common reason for a wastewater to contain intermittent large amounts of
sand, gravel, and grit? - ANS storm events
WasteWater Sources & Characteristics:
Combined wastewater is defined as - ANS sanitary wastewater and stormwater runoff
WasteWater Sources & Characteristics:
In general, the solids content in wastewater is about - ANS 0.1%
WasteWater Sources & Characteristics:
1 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
,In general, what is the % of suspended solids in the total amount of solids - ANS 30%
WasteWater Sources & Characteristics:
Generally, the % of dissolved solids in the amount of total solids is about - ANS 70%
WasteWater Sources & Characteristics:
Which type of organisms would most probably be associated with poor treatment or young
biomass - ANS amoebas
WasteWater Sources & Characteristics:
Which type of organisms would most probably be associated with very clear plant effluent. low
BOD and low amounts of suspended solids - ANS stalked cilates
Basic WasteWater Treatment:
Aerobic bacteria will reproduce and live in an environment that contains only - ANS oxygen
Basic WasteWater Treatment:
Anaerobic bacteria will reproduce and live only in an environment that completely lacks -
ANS free or dissolved oxygen
Basic WasteWater Treatment:
2 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
, The biochemical oxygen demand (BOD) test usually has a specific time of - ANS 5 days
Basic WasteWater Treatment:
An Imhoff cone measures - ANS volume of settleable solids
Basic WasteWater Treatment:
Septic conditions are caused by - ANS anaerobic bacteria
Basic WasteWater Treatment:
Scum is usually removed in the _____treatment stage - ANS primary
Basic WasteWater Treatment:
When domestic wastewater enters natural waters, what species deplete most of the oxygen -
ANS aerobic bacteria
Basic WasteWater Treatment:
Once the oxygen is depleted in a natural body of water, which organisms take over? -
ANS anaerobic
Basic WasteWater Treatment:
3 @COPYRIGHT 2025/2026 ALLRIGHTS RESERVED.
