This is an important question to ask yourself if you are concerned about the purity of your water. Water tanks come in many shapes and sizes. They are used for many applications across the country providing an extra water source in a time of need. Drier states like Texas, Arizona and California use plastic water tanks as an emergency backup plan. Believe it or not, for some farmers and ranchers, this is their only source of fresh water.
Water storage tanks can often be exposed to extreme sunlight which encourages algae growth. This quickly leads to polluted water that cannot come in contact with a human or an animal without causing harm or sickness. This would include everyday applications such as drinking, washing the clothes, playing in sprinklers on a hot summers day. The bottom line is, once algae grows in your water storage tanks, the water basically becomes useless if you are a long way from a water source.