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WATERSHED STEWARDSHIP  

 

Unified vision statement established that integrates water supply, water conservation, water 
recycling, runoff management, wastewater facilities planning, and infrastructure planning using 
a regional watershed approach.   

 

Green infrastructure deployment to enhance infiltration, evapotranspiration, treatment, or 
capture and reuse of stormwater  

 

Ecosystem enhancements for improved hydraulics or water quality, including:  

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Riparian reforestation to enhance pollution mitigation functions 

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Stream channel restoration for increased hydrologic stability   

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Critical land acquisitions (e.g., conservation easements, buffer-zone purchases)   

 

Climate impact resilience principles incorporated into planning for new, repair, and replacement 
of infrastructure.   

As of 2014, LASAN has implemented 38,000 catch basin screens and 10,000 catch basin inserts to 
prevent trash from entering the stormdrain system and receiving waters, to achieve full compliance with 
trash Total Maximum Daily Load requirements (TMDLs).     

LASAN is implementing over 30 regional stormwater capture projects throughout the City after voters in 
2004 overwhelmingly approved a $500 million obligation bond (Proposition O) to fund projects that 
prevent and remove pollutants from our regional waterways. The vast majorities of these projects uses 
natural systems for pollutant removal – such as wetlands or other systems – or rely on infiltration of 
captured runoff and stormwater to benefit local water supply.     

LASAN has implemented Low Flow Diversions at all major stormdrain outfalls that discharge from the 
City into Santa Monica Bay. These Low Flow Diversions divert all dry weather runoff from the 
stormdrains to the sewer system for treatment at the Hyperion Water Reclamation Plant. This program 
has significantly improved the water quality at our beaches and Heal the Bay beach grades during dry 
weather have improved to the highest level (A grade).   

Under the City’s One Water LA Program, discussions with Los Angeles Unified School District (LAUSD) 
management to determine potential for off-site stormwater storage and treatment options are taking 
place. 

Performance Measures & Results 

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Field Test Conducted - 346,691 test for metals, organics, toxicity, and other indicators of 
treatment systems performance.   

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Inspections Conducted - 31,128 inspections of industrial establishments 

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Samples Collected - 81,372 samples collected from environment and our treatment plants  

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Catch Basin Improvement - 73,366 catch basin cleanings  2,095 tons of debris removed from 
catch basins