CLASS D WATER OPERATOR
QUESTIONS AND ANSWERS
What-are-some-physical-characteristics-of-water?---ans-✔✔Temperature,-turbidity,-color,-
taste,-odor
What-are-some-chemical-characteristics-of-water?---ans-✔✔Hardness,-pH,-solids,-and-
gases
What-is-turbidity?---ans-✔✔the-amount-of-suspended-matter,-such-as-clay,-silt,-organic-
matter,-and-microorganisms-in-water
T/F-Water-is-never-found-pure-in-nature.---ans-✔✔True
Is-turbidity-more-of-a-problem-in-groundwater-or-surface-water?---ans-✔✔Surface-water
A-system's-filtered-water-must-be-_______-Nephelometric-Turbidity-Units-(NTU)-or-less-in-
at-least-95%-of-the-measurements-taken-each-month,-and-no-sample-can-exceed-_____-
NTU.---ans-✔✔0.3
1
T/F-True-color-is-dissolved-in-water-(in-solution)-and-cannot-be-removed-by-filtering.---ans-
✔✔True.-Tea-in-water-is-an-example-of-true-color.
Suspended-color-is-called-_______-color.---ans-✔✔apparent
Color-above-______-units-is-objectionable-in-a-public-water-supply.---ans-✔✔15-units
A-scale-called-the-________-measures-odor.---ans-✔✔Threshold-Odor-Number-(TON)
Odor-greater-than-a-scale-of-_______-is-undesirable.---ans-✔✔3
Taste-and-odors-in-water-result-from-_______,-bacteria,-decaying-organic-matter,-gases,-
and-chemicals-such-as-manganese,-zinc,-copper,-iron,-magnesium,-sodium,-and-
potassium.---ans-✔✔algae
Chemical-characteristics-of-water-generally-cannot-be-detected-by-sight,-smell,-or-taste-
and-must-be-determined-by-__________.---ans-✔✔laboratory-analysis
, Chemical-laboratory-analysis-must-be-sampled-_______-per-year-for-surface-water-and-
normally-_______-for-groundwater.---ans-✔✔once/year-for-surface-water
once-every-three-years-for-groundwater
Water-weighs-______-lbs/gal.---ans-✔✔8.34-lbs/gal
T/F
For-water,-1-mg/L-is-equal-to-1-part-per-million-(ppm)-by-weight.---ans-✔✔True
Which-two-minerals-mainly-cause-hardness-in-water?---ans-✔✔Calcium-and-magnesium
Is-hardness-more-of-a-problem-in-groundwater-or-surface-water?---ans-✔✔Groundwater
Water-is-considered-hard-when-it-exceeds-_______.---ans-✔✔100-mg/L-of-calcium-
carbonate
The-pH-scale-ranges-from-_____-to-_____.---ans-✔✔0-to-14
On-the-pH-scale:
0-to-<7-is-______.
7-is-_______.
>7-to-14-is-______.---ans-✔✔Acidic
Neutral
Basic-or-alkaline
Sulfuric,-hydrochloric,-and-nitric-acids-can-be-used-to-______-pH.
Caustic,-lime,-or-soda-ash-can-be-used-to-______-pH.---ans-✔✔Lower
Raise
Suspended-solids-can-be-removed-by-________.---ans-✔✔Filtration
Can-dissolved-solids-be-removed-by-filtration?---ans-✔✔No
Total-dissolved-solids-should-not-exceed________.---ans-✔✔1000-mg/L
What-are-three-common-gasses-found-in-water?---ans-✔✔Hydrogen-sulfide,-carbon-
dioxide,-and-methane
Excess-________-can-cause-blue-baby-syndrome.---ans-✔✔Nitrogen-or-Nitrates
What-is-the-major-source-of-nitrogen-into-drinking-water?---ans-✔✔Fertilizer-and-animal-
waste-carried-by-rainwater-runoff
What-is-the-EPA-primary-MCL-(maximum-contaminant-level)-for-fluoride?---ans-✔✔4.0-
mg/L
QUESTIONS AND ANSWERS
What-are-some-physical-characteristics-of-water?---ans-✔✔Temperature,-turbidity,-color,-
taste,-odor
What-are-some-chemical-characteristics-of-water?---ans-✔✔Hardness,-pH,-solids,-and-
gases
What-is-turbidity?---ans-✔✔the-amount-of-suspended-matter,-such-as-clay,-silt,-organic-
matter,-and-microorganisms-in-water
T/F-Water-is-never-found-pure-in-nature.---ans-✔✔True
Is-turbidity-more-of-a-problem-in-groundwater-or-surface-water?---ans-✔✔Surface-water
A-system's-filtered-water-must-be-_______-Nephelometric-Turbidity-Units-(NTU)-or-less-in-
at-least-95%-of-the-measurements-taken-each-month,-and-no-sample-can-exceed-_____-
NTU.---ans-✔✔0.3
1
T/F-True-color-is-dissolved-in-water-(in-solution)-and-cannot-be-removed-by-filtering.---ans-
✔✔True.-Tea-in-water-is-an-example-of-true-color.
Suspended-color-is-called-_______-color.---ans-✔✔apparent
Color-above-______-units-is-objectionable-in-a-public-water-supply.---ans-✔✔15-units
A-scale-called-the-________-measures-odor.---ans-✔✔Threshold-Odor-Number-(TON)
Odor-greater-than-a-scale-of-_______-is-undesirable.---ans-✔✔3
Taste-and-odors-in-water-result-from-_______,-bacteria,-decaying-organic-matter,-gases,-
and-chemicals-such-as-manganese,-zinc,-copper,-iron,-magnesium,-sodium,-and-
potassium.---ans-✔✔algae
Chemical-characteristics-of-water-generally-cannot-be-detected-by-sight,-smell,-or-taste-
and-must-be-determined-by-__________.---ans-✔✔laboratory-analysis
, Chemical-laboratory-analysis-must-be-sampled-_______-per-year-for-surface-water-and-
normally-_______-for-groundwater.---ans-✔✔once/year-for-surface-water
once-every-three-years-for-groundwater
Water-weighs-______-lbs/gal.---ans-✔✔8.34-lbs/gal
T/F
For-water,-1-mg/L-is-equal-to-1-part-per-million-(ppm)-by-weight.---ans-✔✔True
Which-two-minerals-mainly-cause-hardness-in-water?---ans-✔✔Calcium-and-magnesium
Is-hardness-more-of-a-problem-in-groundwater-or-surface-water?---ans-✔✔Groundwater
Water-is-considered-hard-when-it-exceeds-_______.---ans-✔✔100-mg/L-of-calcium-
carbonate
The-pH-scale-ranges-from-_____-to-_____.---ans-✔✔0-to-14
On-the-pH-scale:
0-to-<7-is-______.
7-is-_______.
>7-to-14-is-______.---ans-✔✔Acidic
Neutral
Basic-or-alkaline
Sulfuric,-hydrochloric,-and-nitric-acids-can-be-used-to-______-pH.
Caustic,-lime,-or-soda-ash-can-be-used-to-______-pH.---ans-✔✔Lower
Raise
Suspended-solids-can-be-removed-by-________.---ans-✔✔Filtration
Can-dissolved-solids-be-removed-by-filtration?---ans-✔✔No
Total-dissolved-solids-should-not-exceed________.---ans-✔✔1000-mg/L
What-are-three-common-gasses-found-in-water?---ans-✔✔Hydrogen-sulfide,-carbon-
dioxide,-and-methane
Excess-________-can-cause-blue-baby-syndrome.---ans-✔✔Nitrogen-or-Nitrates
What-is-the-major-source-of-nitrogen-into-drinking-water?---ans-✔✔Fertilizer-and-animal-
waste-carried-by-rainwater-runoff
What-is-the-EPA-primary-MCL-(maximum-contaminant-level)-for-fluoride?---ans-✔✔4.0-
mg/L
