CWEA WASTEWATER LABORATORY
ANALYST CERTIFICATION TEST PAPER
2026 COMPLETE QUESTIONS WITH
SOLUTIONS
⩥ 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
c) 47.9
d) 479. Answer: D) 479
⩥ 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. Answer: a) Amount in mg/l of dissolved oxygen
⩥ 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
d) 40 EPA 136. Answer: c) 40 CFR 136
⩥ 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. Answer: a) 254 mg/L
⩥ The Kjeldahl method is a method of determining:
a) All organic nitrogen compounds
b) Ammonia
c) Phosphates
d) A and B. Answer: d) A and B
⩥ The primary purpose of chlorinating a secondary effluent is:
a) To oxidize any remaining organic matter
ANALYST CERTIFICATION TEST PAPER
2026 COMPLETE QUESTIONS WITH
SOLUTIONS
⩥ 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
c) 47.9
d) 479. Answer: D) 479
⩥ 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. Answer: a) Amount in mg/l of dissolved oxygen
⩥ 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
d) 40 EPA 136. Answer: c) 40 CFR 136
⩥ 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. Answer: a) 254 mg/L
⩥ The Kjeldahl method is a method of determining:
a) All organic nitrogen compounds
b) Ammonia
c) Phosphates
d) A and B. Answer: d) A and B
⩥ The primary purpose of chlorinating a secondary effluent is:
a) To oxidize any remaining organic matter
