Average most probable
numbers (MPN)/1OO ml
Classification
or No. of coliform/100 ml
Remarks
of sample *
Inland (Fresh) Waters
A
0 -- 50
Preferred, but not generally
attainable.
B
51 -- 500
Average degree of
streams free of fresh sewage
C
501 -- 1,000
Undesirable unless complete
sanitary survey proves
be dangerous if caused by
fresh sewage.
D
Over 1,000
No swimming unless complete
sanitary survey proves
Tidal (Salt) Waters
A
0 -- 23
Preferred.
B
24 -- 240
Satisfactory.
C
Over 240
Unsatisfactory.
*When the membrane filter procedure is used.
NOTE: When using the membrane filter kit follow the instructions provided with it.
Table 1-2. Classification of natural swimming areas.
MD0166
1-36