Bacteria is always found in water, even during winter, but only in insignificant amounts. On the other hand, during summer dangerous Bacteria can appear in your water, and this will reduce the benefits of the water, not to mention that it can get you sick. Luckily, there are simple things that you can do to fight this phenomenon:
First of all, make sure that the water is always moving faster than 2ft per second. This will prevent Bacteria growth, and it will make it much easier for you to filter the water. Make sure that the pipes system allows the water to move at this speed, especially during the hot months when the pipes tend to dilate.
Another thing that many people choose to do is adding chlorine in the water. In general, it is a good idea to avoid using chemicals, but in this case by using a small amount you can make sure that the water will be good for drinking and free of Bacteria.
Make sure that you use the right filtration and that you clean the pipes every once in a while. Also, seal the pipes in proper way, just to be sure that dirt and waste does not get into the water.
With a little bit of effort and knowledge, you can prevent the growth of Bacteria and you can enjoy fresh, clean water even in the hot months of summer.