This is an AO pursuant to the SDWA issued to the EI Dorado Irrigation District. The violation involves failure to monitor and/or report data required by the Unregulated Contaminant Monitoring Rule by December 31, 2003. The Order directs the water supplier to complete any outstanding monitoring as required by 40 CFR 141.40 and to report all outstanding data electronically to EPA in the manner set forth at 40 CFR 141.35.