OSTDS (ACT I) Part A Basic concepts in
Wastewater Treatment 2025/2026 Exam
Questions and Answers | 100% Pass
Onsite disposal systems are a source of? - 🧠ANSWER ✔✔groundwater
recharge
Public health and environmental protection officials acknowledge that
onsite systems are just temporary installations that will be replaced
eventually by centralized sewage treatment services (T/F) - 🧠ANSWER
✔✔False, these systems are acknowledged as permanent approaches.
There are 2.67 million septic systems and 8.8 million housing units (greater
than 30% septic) in Florida (T/F) - 🧠ANSWER ✔✔True
How much urine does the average human create? - 🧠ANSWER ✔✔1.25 L
(0.33 gallons) urine per day
How much feces does the average human create? - 🧠ANSWER ✔✔0.25
Kg (0.55 LB.) feces per day
bacteria per gram of feces? - 🧠ANSWER ✔✔10^12 bacteria per gram
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
, Main elements found in body waste? - 🧠ANSWER ✔✔Organic material 118
g
Nitrogen 16 g
Phosphorus 2 g
Other 14 g
What housing portion causes the most water use per day? - 🧠ANSWER
✔✔TOILET (26.7% 18.5gpcd)
What housing portion causes the most gallons per use? - 🧠ANSWER
✔✔WASHING MACHINE (21.7%, 15gpcd)
BOD (Biochemical Oxygen Demand) - 🧠ANSWER ✔✔Measures the
amount of dissolved oxygen organisms need to degrade wastes in
wastewater
TSS (Total Suspended Solids) - 🧠ANSWER ✔✔A portion of wastewater
that has resisted settling, that is retained when passed through a filter. Also
indicates wastewater clarity.
3 forms of nitrogen commonly measured: - 🧠ANSWER ✔✔ammonia (NH4),
nitrates (NO3) and
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
2
Wastewater Treatment 2025/2026 Exam
Questions and Answers | 100% Pass
Onsite disposal systems are a source of? - 🧠ANSWER ✔✔groundwater
recharge
Public health and environmental protection officials acknowledge that
onsite systems are just temporary installations that will be replaced
eventually by centralized sewage treatment services (T/F) - 🧠ANSWER
✔✔False, these systems are acknowledged as permanent approaches.
There are 2.67 million septic systems and 8.8 million housing units (greater
than 30% septic) in Florida (T/F) - 🧠ANSWER ✔✔True
How much urine does the average human create? - 🧠ANSWER ✔✔1.25 L
(0.33 gallons) urine per day
How much feces does the average human create? - 🧠ANSWER ✔✔0.25
Kg (0.55 LB.) feces per day
bacteria per gram of feces? - 🧠ANSWER ✔✔10^12 bacteria per gram
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
1
, Main elements found in body waste? - 🧠ANSWER ✔✔Organic material 118
g
Nitrogen 16 g
Phosphorus 2 g
Other 14 g
What housing portion causes the most water use per day? - 🧠ANSWER
✔✔TOILET (26.7% 18.5gpcd)
What housing portion causes the most gallons per use? - 🧠ANSWER
✔✔WASHING MACHINE (21.7%, 15gpcd)
BOD (Biochemical Oxygen Demand) - 🧠ANSWER ✔✔Measures the
amount of dissolved oxygen organisms need to degrade wastes in
wastewater
TSS (Total Suspended Solids) - 🧠ANSWER ✔✔A portion of wastewater
that has resisted settling, that is retained when passed through a filter. Also
indicates wastewater clarity.
3 forms of nitrogen commonly measured: - 🧠ANSWER ✔✔ammonia (NH4),
nitrates (NO3) and
COPYRIGHT©JOSHCLAY 2025/2026. YEAR PUBLISHED 2025. COMPANY REGISTRATION NUMBER: 619652435. TERMS OF USE. PRIVACY
STATEMENT. ALL RIGHTS RESERVED
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