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The original wastewater treatment plant was constructed in 1960, and is now over 50 years old. Major expansion of the wastewater treatment plant to its current 10.9 million gallon per day (“MGD”) capacity was completed in 1983. Over the last 5 years the City has completed rehabilitation of the two anaerobic digesters, construction of a new reclaimed water pump station, and improvements to the gravity thickeners. Construction of an entirely new electrical system is currently underway.

Due to the age of the major mechanical equipment at the wastewater treatment plant, the City prepared a comprehensive Capital Improvement Plan for the wastewater treatment plant, realizing the need to focus on major capital projects to replace aging equipment and improve inefficient wastewater treatment processes at the wastewater treatment plant over the next 20 years.

The focus of the 20-year wastewater treatment plant Capital Improvement Plan is not on increasing the capacity of the WWTP; the current 10.9 MGD capacity will be more than adequate beyond a 20 year horizon. For the 2010/2011 fiscal year, wastewater flow into the WWTP was at annual average rate of 5.696 MGD, well below the 10.9 MGD capacity. Assuming a conservative projected future City growth rate of 1,000 people per year, the 10.9 MGD capacity will not be exceeded for over 30 years. The 20-year wastewater treatment plant Capital Improvement Plan considered repair and rehabilitation of the outdated equipment and processes used at the wastewater treatment plant, and the need to appropriately plan for replacement of the equipment with current technology that will improve the City’s ability to efficiently treat wastewater flows.

The Capital Improvement Plan approved by the City Council on April 21, 2010, assessed all of the major unit processes at the City’s wastewater treatment plant, and recommended a 20 year program consisting of over 30 projects (some of which may be combined into single projects for better cost efficiencies) estimated to cost $67,000,000. To date, the City has completed approximately $12,000,000 of these projects, leaving $55,000,000 currently unfunded that must be completed.

For a copy of the sewer rates please contact Greg Paige at (760) 459-6388, or

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