2025/2026
Wastewater Laboratory for Analysts Questions
Current Exam Questions and Correct Verified
Answers
Q: By what date should the DMR (discharge monitoring report)
from the previous month be post marked to the EPD:
a) 15th
b) 16th
c) 22nd
d) 1st
Ans: a) 15th
Q: A 100 Milliliter sample of solution was evaporated to dryness
in a dish that weighed 62.1292 grams. The dish plus solids weighed
62.1771 grams after drying and cooling. What was the total solids
content in milligrams per liter (mg/L)?
a) 0.479
b) 4.79
1
, 2025/2026
c) 47.9
d) 479
Ans: D) 479
Q: The Winkler Titration method is used for determining which
one of the following conditions in water samples?
a) Amount in mg/l of dissolved oxygen
b) Count of bacterial colonies
c) Amount in mg/l of bound oxygen contained within a samples
d) Degree of filtration
Ans: a) Amount in mg/l of dissolved oxygen
Q: Where should one look first to find an approved method for
measuring phosphate levels for an NPDES permit?
a) Standard Methods
b) USEPA Methods for Chemical Analyses of Water and Wastes
c) 40 CFR 136
2
, 2025/2026
d) 40 EPA 136
Ans: c) 40 CFR 136
Q: An Analyst filters 50mL of raw domestic wastewater through a
tared glass fiber filter, dries the filter at 103-105 degrees C and
weighs it again. Given the following weights, what is the total
suspended solids of the samples in mg/L?
Tare Weight: 0.4158g / Dry Weight: 0.4285g
a) 254 mg/L
b) 0.254 mg/L
c) 127 mg/L
d) 130 mg/L
Ans: a) 254 mg/L
Q: The Kjeldahl method is a method of determining:
a) All organic nitrogen compounds
b) Ammonia
3
Wastewater Laboratory for Analysts Questions
Current Exam Questions and Correct Verified
Answers
Q: By what date should the DMR (discharge monitoring report)
from the previous month be post marked to the EPD:
a) 15th
b) 16th
c) 22nd
d) 1st
Ans: a) 15th
Q: A 100 Milliliter sample of solution was evaporated to dryness
in a dish that weighed 62.1292 grams. The dish plus solids weighed
62.1771 grams after drying and cooling. What was the total solids
content in milligrams per liter (mg/L)?
a) 0.479
b) 4.79
1
, 2025/2026
c) 47.9
d) 479
Ans: D) 479
Q: The Winkler Titration method is used for determining which
one of the following conditions in water samples?
a) Amount in mg/l of dissolved oxygen
b) Count of bacterial colonies
c) Amount in mg/l of bound oxygen contained within a samples
d) Degree of filtration
Ans: a) Amount in mg/l of dissolved oxygen
Q: Where should one look first to find an approved method for
measuring phosphate levels for an NPDES permit?
a) Standard Methods
b) USEPA Methods for Chemical Analyses of Water and Wastes
c) 40 CFR 136
2
, 2025/2026
d) 40 EPA 136
Ans: c) 40 CFR 136
Q: An Analyst filters 50mL of raw domestic wastewater through a
tared glass fiber filter, dries the filter at 103-105 degrees C and
weighs it again. Given the following weights, what is the total
suspended solids of the samples in mg/L?
Tare Weight: 0.4158g / Dry Weight: 0.4285g
a) 254 mg/L
b) 0.254 mg/L
c) 127 mg/L
d) 130 mg/L
Ans: a) 254 mg/L
Q: The Kjeldahl method is a method of determining:
a) All organic nitrogen compounds
b) Ammonia
3
