Well,

Water sources are heavily polluted by pathogens resulting from the discharge of human or animal waste, and many pathogens, including bacteria, viruses and micro-organisms (Protozoa), the most important of which are the following pathogens:

 (coli Entamoeba histolytica: Giardia spp and Balantidium) and other organisms, and there is no way to measure all these indicators periodically in natural water or drinking water after liquidation, for the diversity of measurements and for the time and effort required, so substitute only by measuring the total number of bacteria Coliform and the number of Escherichia coli, which act as biological evidence. If these bacteria are found, this is considered to be a reliable evidence of the contamination of these waters with human or animal wastes, so the possibility of any pathogenic cause of pathogens Know their transition by water remains in place, and measures must be taken to prevent it such as sterilization of water in one of the known ways or to avoid consumption. In all cases, finding these biological evidence is a sure indication of misuse of the water source.

Regards

I think the source if water plays an important role in deciding which type if bacteria do exist.

For a surface water contaminated by human wate we find fecal coliform bacteria.

If the surface water is contaminated by animal waste we will find fecal streptococcus bacteria.

For deep groundwater, the probability of bacterial contamination is lower.

The most bacteria that contaminate drink water are: Enterobacteriaceae and on the top E. coli, Staphylococcus spp. and Bacillus spp.

Please have a look at these useful RG links and a PDF attachment.

Article Water Microbiology. Bacterial Pathogens and Water

Article Contamination of water resources by pathogenic bacteria

Article Microbiological study of drinking water: Qualitative and qua...

Hi dear,

Thanks for the question. I think that water is a good media for bacteria growth. I'm agree with the most replies of colleagues, but i add somthing that the presence of other bodies like Antibiotic, heavy metals, pharmaceuticals, ...in water can make a more dangerous bacteria.

With my best regards!

Dr. Adel Oueslati

Naegleria fowleri

The genus Naegleria is composed of a group of free-living amoeboflagellates that are distributed worldwide. Although several species have been identified, only one, Naegleria fowleri, has been associated with human disease. N. fowleri is the causative agent of primary amoebic meningoencephalitis (PAM), a fatal disease of the central nervous system. N. fowleri has been isolated from a variety of water sources, including domestic water supplies, recreational water facilities, and thermally polluted water from industrial sources. The presence of N. fowleri in environmental water has been linked to temperature, pH, coliforms, and the amount of organic matter present.

There are various parasites that exists in the world wether non pathogenic or pathogenic, and they can be acquired through the exposure of contaminated water by ingestion. These parasites include Giarda spp., entamoeba spp., naegleria fowleri, acanthamoeba spp., Balantidium coli and many more. We can analyze them by simply executing different methods such as the sedimendation and floating methods or through DFS, entero test and Sigmoidoscopy and treat it with metronidazole or flagyl.