System Description

The City of Rohnert Park, located in the southern Santa Rosa plain of Sonoma County, depends upon ground water and Sonoma County Water Agency (SCWA) aqueduct water to meet the demands of its 40,000 residents. Supplemental water is obtained during peak demand periods from 12 turnout connections from the SCWA.

The principle source of water is a series of 34 operational wells. In addition, Rohnert Park has five reservoirs with 2.2 million gallons of storage. By the end of the year 2000, Rohnert Park will have an additional 2 million gallons of storage for a total of 4.2 million gallons. Rohnert Park is considered one water pressure zone, supplying domestic water to an area of approximately 6 square miles. The City does not deliver water outside the city limits.

The water distribution system consists of approximately 90 miles of water mains, 94% of which are 6 - 12 inch asbestos cement pipe, 5% 6 -12 inch plastic pipe and 1% ductile iron. The city has approximately 8,500 service connections, not including fire hydrants. There are 1,200 fire hydrants in the City. Each fire hydrant lateral, regardless of size, has an isolation valve to isolate the water system when fire hydrant damage occurs.

The SCWA aqueduct parallels the railroad tracks running north and south through Rohnert Park. This system provides supplemental water during peak demand periods. Each station has a hydraulic control valve that automatically regulates the pressure throughout the system. Water from the SCWA aqueduct receives continuous chlorination treatment at the source. There are no dedicated facilities from the wells or SCWA turnouts. All operational wells and SCWA turnouts feed into the City's distribution system. All SCWA aqueduct connections are metered. In addition, the agency has 36 million gallons of storage at the Ralphine Tank storage site and 18 million gallons at the Cotati Tanks storage site.

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