The Municipal Water District of Orange County is an agency of Metropolitan Water District of Southern California. The agency is a wholesale water supplier to all of Orange County through 28 retail water agencies. Residential and commercial water consumers are not directly supplied through the Municipal Water District, but through the client agencies. The cities of Anaheim, Fullerton and Santa Ana are not served by the agency. Along with supplying reliable high quality water, the agency works to improve the region's water resources through other services. These services include regional representation, water use efficiency programs, water education programs, emergency preparedness, planning and studies.