This document summarizes three experiments that tested water quality. The first experiment showed that soil can effectively filter out contaminants like oil, vinegar, and detergent from water. The second experiment showed that water treatment processes using sand, charcoal and other filters can decontaminate contaminated water. The third experiment tested tap water, Dasani bottled water and Fiji bottled water and found that tap water had the highest levels of contaminants measured, while Fiji had the lowest, supporting the hypothesis. Overall, the experiments demonstrated that natural and water treatment processes can filter water to safe drinking levels.