There are many possible solutions or prevention methods for water pollution. Something that we can do which is very simple is to recycle trash like plastic, old bottles, and many other substances, however doing this alone will only reduce the pollution within water by a little bit, we must also conserve water, as we need to save as much purified/clean water as possible. Although many people know to do this, the problem is that some people forget to do it. This is a reminder to people who forget to do these solutions because its the most effective way to prevent and reduce water pollution.
Another solution to this is water treatment, such as as wastewater treatment facilities that can almost remove all pollutants in water using a type of chemical. Although this solution is not something everyone can do it is still an effective solution to the water pollution problem.
What we would consider a considerable option based on temperature, however, would possibly be by controlling the temperatures in water storage and processing. However, we have to take into account the general temperature limits of said water tanks, which are normally from polyethylene which can withstand up to 65°C and/or polypropylene, in which case can withstand up to 93°C. With this solution, it would have to depend on the material of the water tank. If the tank is polyethylene, a temperature of 50-60°C would be an optimal temperature window, whilst polypropylene tanks would best have a 60-80°C containment to minimize bacteria within.