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| Water Quality Water Treatment |
| Water imported from the Colorado River and Northern California is treated at the Metropolitan Water District's Diemer Filtration Plant in Yorba Linda before it enters the IRWD distribution system. Local groundwater undergoes disinfection at IRWD purification facilities before it is provided to customers.
IRWD distributes an informative Annual Water Quality Report to customers each June. This report provides water testing results and answers commonly asked questions about water quality. Click below or call the District at (949) 453-5500 to request an additional hard copy. IRWD Domestic Water Quality Report Water Quality Report for the former Santiago County Water District area Water Quality Report for Orange Park Acres Mutual Water Company |
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