There is no avoiding the fact that contaminated sewage water will always flow with the floodwaters. It is where pathogens like bacteria, viruses, mold spores, or protozoans are present in large numbers in sewage wastes.
The extent of the contamination will depend on the size of the affected area. The greater the area the greater the contamination coverage and spread of the pathogens. Even flood waters that were not in contact with raw sewage can be contaminated with the microbiological organisms from animal wastes, street runoffs and natural soil.
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