Stream classification for water quality criteriaa
Table 5-3.
Required Treatment
Quality Criteria
Class
Ab
Secondary (tertiary in
Water supply, recreation
Coliform bacteria, color,
turbidity, pH, dissolved
some cases to meet
oxygen, toxic materials,
criteria) plus dis-
infection
taste- and odor-producing
chemicals, temperature
Bb
Bathing, fish life,
Coliform bacteria, pH
Secondary plus disinfection
recreation
dissolved oxygen, toxic
materials, color and
turbidity (at high levels),
temperature
Industrial, agricultural
Dissolved oxygen, pH, floating
c
Primary and, in some cases,
navigation, fish life
and settleable solids,
secondary
temperature
D
Primary
Navigation,
cooling water
Nuisance-free conditions,
floating material, pH
a
Based upon data from (3) and (4)
b
May require nutrient (nitrogen and phosphorus) removal
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