CWEA WASTEWATER
LABORATORY ANALYST
CERTIFICATION 2026
EXAMINATION TEST PAPER
QUESTIONS AND SOLUTIONS
GRADED A+
◉ HNO3 (Nitric Acid) is an example of? Answer: Oxidizer
◉ What do you use before using pipets on phosphorus? Answer:
Wash with HCl then water.
◉ What is Nitrification? Answer: Ammonia Nitrites Nitrates
(NH3, NO2, NO3)
◉ Cadmium Reduction Involves? Answer: Conversion of
Nitrates to Nitrites
◉ How do you check a manhole for gases? Answer: Check
before opening
◉ Conductivity also measures? Answer: Total dissolved solids
◉ If a compound weights 1.20 g/cm3 what can be said about its
specific gravity? Answer: It is 20% heavier than water.
◉ What titrant is used in alkalinity? Answer: H2SO4 (Sulfuric
Acid)
◉ Main concern with a chemical spill is? Answer: Containment
and cleanup
◉ Ammonia is released at what pH? Answer: pH > 11
, ◉ What is Digestion? Answer: Decomposing a sample with
high heat and acidic conditions
◉ What angle is light measured by using a nephlometer?
Answer: 90°
◉ If there is a 95% confidence interval (CI) with 20 samples,
how many points can be out of the interval for it not to work?
Answer: 1
◉ How should chemicals be stored? Answer: In their
appropriate container as indicated.
◉ How many points are needed to construct a control curve?
Answer: 3
◉ What kind of sample is used in oil and grease analysis?
Answer: Grab
◉ How often do analysts need to check eye wash and shower
stations? Answer: In intervals
◉ How should acids be added to water? Answer: Add acids to
water
◉ Digestion in the phosphorus test produces? Answer:
Orthophosphates
◉ What is the most Common portable DO Meter? Answer:
Membrane Electrode
◉ BOD Incubation temperature? Answer: 20°C ± 1°C
◉ What chemical in fire extinguishers fights oil and electrical
fires? Answer: Carbon Dioxide/Type C
LABORATORY ANALYST
CERTIFICATION 2026
EXAMINATION TEST PAPER
QUESTIONS AND SOLUTIONS
GRADED A+
◉ HNO3 (Nitric Acid) is an example of? Answer: Oxidizer
◉ What do you use before using pipets on phosphorus? Answer:
Wash with HCl then water.
◉ What is Nitrification? Answer: Ammonia Nitrites Nitrates
(NH3, NO2, NO3)
◉ Cadmium Reduction Involves? Answer: Conversion of
Nitrates to Nitrites
◉ How do you check a manhole for gases? Answer: Check
before opening
◉ Conductivity also measures? Answer: Total dissolved solids
◉ If a compound weights 1.20 g/cm3 what can be said about its
specific gravity? Answer: It is 20% heavier than water.
◉ What titrant is used in alkalinity? Answer: H2SO4 (Sulfuric
Acid)
◉ Main concern with a chemical spill is? Answer: Containment
and cleanup
◉ Ammonia is released at what pH? Answer: pH > 11
, ◉ What is Digestion? Answer: Decomposing a sample with
high heat and acidic conditions
◉ What angle is light measured by using a nephlometer?
Answer: 90°
◉ If there is a 95% confidence interval (CI) with 20 samples,
how many points can be out of the interval for it not to work?
Answer: 1
◉ How should chemicals be stored? Answer: In their
appropriate container as indicated.
◉ How many points are needed to construct a control curve?
Answer: 3
◉ What kind of sample is used in oil and grease analysis?
Answer: Grab
◉ How often do analysts need to check eye wash and shower
stations? Answer: In intervals
◉ How should acids be added to water? Answer: Add acids to
water
◉ Digestion in the phosphorus test produces? Answer:
Orthophosphates
◉ What is the most Common portable DO Meter? Answer:
Membrane Electrode
◉ BOD Incubation temperature? Answer: 20°C ± 1°C
◉ What chemical in fire extinguishers fights oil and electrical
fires? Answer: Carbon Dioxide/Type C
