E. coli lives not only in living organisms, but also in water where it hits household and agricultural effluents.
According to the United States Environmental Protection Agency (USEPA) E. coli is the best indicator of health risk
from water contact in recreational waters2. The presence of E. coli in water is an indication of recent contamination
from sewage or animal wastes, which may have many disease-causing organisms2. The presence of E-coli in water
negatively affects its quality, using of this water can cause severe poisoning, which sometimes can be lethal3.
Therefore, simple and rapid determination of E-coli presence in water is a topical problem. E-coli must be indicator
bacteria. There are some criteria for indicator organisms: