antioch’s water rights, water supply and operationsantioch’s location •antioch is located in...
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Antioch’s Water Rights, Water Supply and Operations
Ron BernalAssistant City Manager/Public Works Director/City Engineer
City of Antioch
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Antioch location
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Sacramento – San Joaquin Rivers at Antioch
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Antioch’s Location
• Antioch is located in the Western Delta and eastern Contra Costa County.
• The City is located downstream of:
oEmmaton
oJersey Point
oRock Slough
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D-1641 DWR Compliance (J. Leahigh)
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River Channel
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Antioch’s water supply demands and service:
• Serves drinking water to over 100,000 residents
• Also supplies water for irrigation, commercial and industrial use.
• Has 31,798 connections and a current population of 108,298 (2015)
• Is projected to experience significant future growth
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Antioch’s primary water supply:
• Comes from San Joaquin and Sacramento River flows in the San
Joaquin River Channel. Much of the water is Sacramento River flow.
• Is diverted at the City’s intake located within the city.
• Is pumped from the river channel at a maximum capacity of 16
million gallons per day
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Antioch’s Substitute Water Supply:
• Purchased from Contra Costa Water District when Antioch’s primary water supply
at its intake experiences chloride levels over 250 mg/L.
• Substitute water is delivered as raw water to the City by way of the Contra Costa
Canal. The City has no rights to the Canal.
• Purchases of substitute water generally occur in the late summer and fall
whenever chloride levels at Antioch are typically higher than during the rest of
the year.
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Antioch’s Water Rights:
• Antioch has adjudicated pre-1914 appropriative water rights. Town of Antioch v. Williams Irrigation District et al. (1922) 188 Cal. 451, 455.
• Water rights include flows from both the San Joaquin and the Sacramento Rivers.
• The water is used principally for municipal and industrial uses within the City’s boundaries and sphere of influence.
• The City reports its water use to the SWRCB. (S.O.D. No. #S009352)
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1968 Agreement with DWR:
• Purpose is to partially mitigate the impacts of the present SWP system.
• Bureau is not a party to the agreement.
• DWR reimburses the City only one-third the cost to purchase substitute water when chlorides at Antioch exceed 250 mg/L based on specified formula.
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2016 CCWD-DWR Agreement:
• Guarantees CCWD water up to 50,000 afa (depending on certain factors) at a quality of 30 mg/L chlorides.
• Water conveyed to CCWD either by the existing EBMUD facilities at Freeport or by way of the North Delta Diversion (delivery to CCWD at Victoria Canal in the south Delta).
• Intended to mitigate impacts of the WaterFix Project.
• DWR to pay for conveyance and many related construction costs.
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Impacts to Antioch from the WaterFix Project:
• Increased chlorides and bromides at Antioch’s intakes
• Reduced usable days of water available at Antioch’s intake
• Increased treatment costs.
• Increased costs due to need to purchase substitute water more often.
• Fixed term of Antioch’s 1968 Agreement ends prior to the operation of the WaterFix project.
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Potential Mitigation might include:
• Increased outflows at Antioch.
• Requiring DWR/Bureau to meet D-1641 M&I standards at Antioch
instead of Rock Slough with bromide levels included.
• DWR to comply with Section 10 of the 1968 Agreement.
• Physical Solution
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