“The Salty Truth”

““The Salty Truth”The Salty Truth”

Southern California Water Southern California Water DialogDialog

March 23, 2011March 23, 2011

Peer A. SwanPeer A. Swan


•Need long term focus on reducing Need long term focus on reducing SALT to protect local water supply, SALT to protect local water supply, which makes up over half the water which makes up over half the water supply in the MWD service areasupply in the MWD service area

•Currently importing nearly 1,300,000 Currently importing nearly 1,300,000 tons of salt per year into the MWD tons of salt per year into the MWD service area with the largest amount service area with the largest amount coming from the Colorado River.coming from the Colorado River.


• 1,200,000 SWP at 250 ppm = 272,000 t/yr1,200,000 SWP at 250 ppm = 272,000 t/yr

• 1,150,000 CRA at 650 ppm = 1,017,000 1,150,000 CRA at 650 ppm = 1,017,000 t/yrt/yr

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• Total 1,289,000 t/yr Total 1,289,000 t/yr

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Santa Ana WatershedSanta Ana Watershed

• Imports about 700,000 AF/YRImports about 700,000 AF/YR

• Average TDS of about 610 ppmAverage TDS of about 610 ppm

• 580,720 tons of salt per year580,720 tons of salt per year



• Orange County Sanitation 140 MGD Orange County Sanitation 140 MGD dischargedischarge

• 156,800 AF / yr at 1100 ppm salt156,800 AF / yr at 1100 ppm salt

• 235,000 T/yr to ocean 235,000 T/yr to ocean



Imported water salt = 580,720 T/yrImported water salt = 580,720 T/yr

Less ocean discharge 235,000 T/yrLess ocean discharge 235,000 T/yr

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Net imported salt 345,720 T/yrNet imported salt 345,720 T/yr

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• Estimated salt imbalance 524,000 T/yrEstimated salt imbalance 524,000 T/yr

• Imports less ocean discharge 345,720 T/yrImports less ocean discharge 345,720 T/yr

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Other Salt contribution 178,280 T/yrOther Salt contribution 178,280 T/yr

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““The Salty Truth”The Salty Truth” Santa Ana Watershed - How to achieve balanceSanta Ana Watershed - How to achieve balance

• Estimated salt imbalance 524,000 T/yrEstimated salt imbalance 524,000 T/yr• Lower salt in CRA to 200 ppm <217,600>T/yrLower salt in CRA to 200 ppm <217,600>T/yr• Lower recycled water to 200 ppm <65,280> T/yrLower recycled water to 200 ppm <65,280> T/yr• Lower SWP to 150 ppm <40,800> T/yrLower SWP to 150 ppm <40,800> T/yr• Reduce urban contribution 50 ppm <47,600> T/yrReduce urban contribution 50 ppm <47,600> T/yr• Reduce import 100,000 AF 200 ppm <27,200> T/yrReduce import 100,000 AF 200 ppm <27,200> T/yr ---------------------- Remaining imbalance 125,520 T/yrRemaining imbalance 125,520 T/yr ==============

Questions or Comments?Questions or Comments?




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“The Salty Truth”