yes
The kinds of impurities that remain in river water include many types of bacteria and heavy metals.
Somebody (or something) is using the river as a toilet.
you could be taking water from a river with bacteria or oil and chemicals
Fish in the water, vegitation in the water and on the shore, animals that live in the area around the river, bacteria in the water, many microscopic organisms in the river ect.
River water contains a lot of things like fish. River water also contains bacteria, leaves, and minerals from the riverbed.
Change in the ecosystem in the river nearby. Some fish, bacteria etc thrive in cold water, different ones in warm water.
It is generally not safe for dogs to drink river water due to potential contamination from bacteria, parasites, and pollutants. It is recommended to provide clean, fresh water for your dog to drink.
Poorly maintained septic tanks have resulted in unprecedented increase in presence of bacteria like E-coli in the water of Yarra river. According to estimates the level of E-Coli bacteria presence in water of Yarra river is 200 times more than safe limit.
River water is generally a heterogeneous mixture based on the different components it is carrying. Water by definition is not an element, rather a molecule comprised of them.
No. If you have a good knowledge of the source of water-flow, then a river may be an acceptable source of clean water. River water is unsafe for many reasons. Often river water will sit in pools, or come from may types of sewage run-off. The sources of water are often contaminated. River water is also contaminated with other bacteria as well as animal excrement. It is recommended to filter, then boil river water before drinking. Running water in general should be safer than standing water, but certain elements can also taint this water.
Ever living thing have bacteria
Well water has been filtered through layers of rock and sand, so there is less dirt and bacteria in the water. River water has stuff fall in all the time (like dirt and tree branches and animal poop and pee!).