According to the report presented to WUC, the additional testing is primarily necessary to determine how fluoride will interact with the phosphoric acid already present in the system as a mechanism to prevent lead from leaching into the water supply. "WUC will be the first known water utility to add fluoride to the drinking supply which already contains phosphoric acid for purposes of lead mitigation," reads an excerpt from the report. "While other utilities have both additives … no other utility (in North American based on research to date) is known to have fluoride added subsequent to the addition of phosphoric acid."