On May 2, 2002, EPA issued an AO to Respondent, after determining the Yabucoa Urbano public water system was in violation of the individual filter monitoring requirements of the SDWA. The AO required the Respondent's Yabucoa Urbano public water system to 1) install and operate continuous monitoring turbidimeters by October 31, 2002, and 2) provide certification to EPA and the PRDOH that compliance was achieved by November 22, 2002. On December 13, 2002, EPA issued a Complaint, Findings of Violation, Notice of Proposed Assessment of a Civil Penalty and Notice of Opporturnity to Request a Hearing to Respondent for failure to comply with the AO.