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1 RiversideCA.gov1
RiversideCA.gov
MOBILITY & INFRASTRUCTURE COMMITTEEMARCH 13, 2025NON-POTABLE/RECYCLED WATER OVERVIEWPublic Utilities Department RiversideCA.gov2
BACKGROUND1. Non-potable and recycled water studied over 30 years (1992 -2024).2. Phased and demand approach to implementation. 3. High cost to implement projects compared with other water resources projects.4. Non-potable uses focused to canal systems (Gage/Riverside).5. Recycled water limited due to discharge obligations.1992 Recycling Master Plan, by MWH1997 to 2010Small Recycled Water System Implementation 2024 Non-Potable/Recycled Water Master Plan, by Carollo2011Recycled Water Facilities Plan by HDR 2018ConstructionJackson Street, Recycled Water Pipeline, Phase I 1 2 2/28/2025
2 RiversideCA.gov3
DISCUSSION – RPU WATER SUPPLY SOURCES1. Primary source of supply is local groundwater for both its potable and non-potable water. 2. Riverside has a contract with WMWD to access imported water when needed (up to 21,700 AFY, 25% of current water supply). 3. Limited recycled water from the City’s Regional Water Quality Control Plant for non-potable uses. 4. Since 2009, Riverside has been imported-water independent by relying solely on local water supplies to meet water demands.
RiversideCA.gov4
RPU WATER SUPPLY SOURCES
RWQCP
Mills Interconnect
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3 RiversideCA.gov5
RIVERSIDE CANAL1. 1871 – Constructed by the Riverside Water Co. for Citrus irrigation and domestic needs.2. 1961 – City acquired Riverside Canal Co.3. 1980’s – Riverside Canal Abandonment Task Force established.–Incidental uses should be removed wherever possible and canal abandoned.–Water carrying obligations.–Abandonment south of Jefferson St. –Riverside Canal continues to remain in use.•Irrigation water to WMWD.•Conveying stormwater run-off.
RiversideCA.gov6
GAGE CANAL1. 1885 – Constructed by Matthew Gage to facilitate citrus irrigation.2. 1959 – City files “friendly” condemnation action.3. 1965 – City acquired Gage facilities. 4. 1973 – City converts the Upper Gage Canal from an open channel to an enclosed pressurized pipeline for domestic use.
Matthew GageFlume #9 over Tequesquite Arroyo (c. 1888)
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4 RiversideCA.gov7
GAGE CANAL (Cont’d)5. 1991 – Gage Exchange Agreement–City to receive up to 6,400 AFY of potable water in exchange for up to 8,000 AFY of non potable water from the Riverside Canal6. 2000’s - Groundwater treatment plants constructed to treat for contaminants7. 2021 – Agreement terminated by Gage Canal Co.
Bunker Hill Basin(Gage Wells)
Riverside Canal
City of RiversideReservoirsGage Irrigation customersGage Exchange (Non-Operational)Gage PipelineWMWDTreatment Plants Weir 2RPU Non-Potable WellsOlivewood Wells
Waterman/North OrangeSupply
RiversideCA.gov8
GAGE CANAL (Cont’d)
Bunker Hill Basin(Gage Wells)
Riverside Canal
City of RiversideReservoirsGage Irrigation Customers8,545 AFGage Exchange (Non-Operational)Gage PipelineWMWDTreatment Plants Weir 2RPU Non-Potable WellsOlivewood Wells 3,443 AF
Waterman/North OrangeSupply
Olivewood Booster Station
Weir 2 and Gage Canal
Olivewood Well #3
Tippecanoe Treatment Plant18,108 AF23,210 AF1
Riverside Canal1Gage production for calendar year 2024Gage Canal 7 8
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5 RiversideCA.gov9
RECYCLED WATER1. Recycled water use evaluated since 1992. •1992 Recycling Master Plan, by MWH.•1997 – 2010 Small Recycled Water System Implementations (Van Buren Golf Center, Van Buren Urban Forest, Toro Manufacturing Company).2. In 2008 the State approved use of wastewater with discharge. commitments to the Santa Ana River.3. Reduced wastewater availability at the RWQCP.•The Great Recession.•State Drought Declaration.•Permanent water conservation measures.
RiversideCA.gov10
RPU WATER PRODUCTION SCHEMATIC
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RPU’s POTABLE WATER SYSTEM1. 44 Active Potable Wells.2. 6 Groundwater Treatment Plants.3. 16 Reservoirs.4. 993 miles of pipeline.5. 31 Pump Stations.6. 25 Pressure Reducing Stations.7. Over 69,000 service connections.8. High Level of Service.
RiversideCA.gov12
RPU’s NON-POTABLE/RW WATER SYSTEMNON-POTABLE WATER SYSTEM:1. 6 non-potable wells.2. 6 miles of pipeline.3. 14 miles of canal. (Riverside Canal).4. 15.6 miles of canal (Gage Canal).RECYCLED WATER SYSTEM:1. 8 miles of pipeline. 11 12
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7 RiversideCA.gov13
RPU’s NON-POTABLE/RW WATER SYSTEMFY2023-24:1. 9% or 7,981 AFY of Riverside groundwater used as non-potable. •544 AFY from Riverside Basin delivered to WMWD.•7,437 AFY from Bunker Hill Basin delivered to Gage customers.2. 170 AFY of recycled water (wastewater).3. Decline in non-potable production (termination of Gage Exchange Agreement.Current Use:1. Riverside Canal used to convey water to WMWD. 2. WMWD intends to use segment of Riverside Canal (Hoover to Jefferson) to wheel non-potable water from WMWD’s Well 7.3. Additional investment in non-potable infrastructure to be evaluated on a project-by-project basis.4. Issues: ageing infrastructure; water quality; planned/un-planned maintenance.
RiversideCA.gov14
RPU’s NON-POTABLE/RW WATER SYSTEM2024 Carollo NP/RW Master Plan Findings:1. Potential project to utilize Riverside Canal to provide non-potable water to the Central Ave. RW.2. Needs further study to analyze feasibility of this option.3. Incorporated on-going work between RPU and San Bernardino Municipal Valley Water District on RHPWP-West and East Branch Projects.4. Projects grouped into 3 phases.13 14 2/28/2025
8 RiversideCA.gov15
NON-POTABLE/RW WATER PLAN
RiversideCA.gov16
NON-POTABLE/RW WATER PLANChallenges:1. Potential future reduction of available recycled water dueto State’s water use efficiency standards for indoor use.2. Wastewater change petition needed to secure additionalrecycled water rights for future system expansion.3. Lack of cost differential between potable and recycledwater rates to incentive recycled water use.4. Continued non-potable system O&M costs and ageinginfrastructure.5. Groundwater rights.15 16 2/28/2025
9 RiversideCA.gov17
NORTHSIDE AG INNOVATION CENTER
Non-Potable Summary:1. Water quality evaluation; 2. Non-potable infrastructure needs 3. Non-potable reliability 4. Est. Cost: $1.4M to $8.1MRecycled Water Summary:1. RW Phase 3 completion 2. RW infrastructure need3. (Est. Cost: $1M RiversideCA.gov18
CENTRAL AVENUE RECYCLED WATERLINE
SITE_ID Site TypeRecycled Water Demand (AFY)1Recycled Water Demand (GPM)Peak RW Demand (GPM)1Cemetery51.331.80218.12School30.618.96130.13School5.93.6825.34Church/School8.85.4637.45Church/School10.06.2042.56Street Median Landscaping22.213.7694.47Street Median Landscaping8.75.3636.8Totals 137.5 85 585 Note:1. Landscape Meter/Service or Recycled Water Meter/Service - Recycled Water Demand was determined from Enquesta.17 18 2/28/2025
10 RiversideCA.gov19
CENTRAL AVENUE RECYCLED WATERLINE (Cont’d)
Non-Potable Summary:1. Re-purposed the existing Olivewood Booster Station.2. Property needed for reservoir and pump station.3. Water quality evaluation.4. Est. Cost: $4.9M (not including property costs).Recycled Water Summary:1. RW Phase 2 completion (RHPWP-East Branch).2. RW infrastructure need (pipeline and customer site conversions).3. Est. Cost: $8.8M.
RiversideCA.gov20
NEXT STEPS1. Continue phased approach to RW/non-potable water projects.2. Evaluate project opportunities on a case-by-case basis.3. Continue to wheel/wholesale non-potable water to WMWD to monetize asset.4. Pursue opportunities for outside funding/partnerships. 5. Example: RHPWP project benefitsa. Environmental credits for future water supply projects.b. Additional recycled water supply. c. Potential to exchange potable water resources. 19 20
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Priority No. 4 Environmental StewardshipGoal No. 4.2 – Sustainably manage local water resources to maximize reliability and advance water reuse to ensure safe, reliable, and affordable water to our community.Cross-Cutting ThreadsSTRATEGIC PLAN ALIGNMENT Community Trust
Equity
Fiscal Responsibility
Innovation
Sustainability & Resiliency
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That the Mobility & Infrastructure Committee receive and file this item.RECOMMENDATIONS21 22