An Administrative Order is being issued to the Sinclair Wyoming Refining Company (Sinclair). This Order requires that Sinclair, as owner and/or operator of the Sinclair public water system (System), take measures to return the System to compliance with the SDWA and the National Primary Drinking Water Regulations. The violations include failure to monitor for total coliform bacteria and turbidity, failure to maintain an adequate residual disinfectant level, late reporting of surface water treatment operation measurements to EPA, and failure to notify the public and the EPA of the violations.