Coastal Storm Drain Outfall Program
Sampling stations in the Coastal Storm Drain Outfall Program (CSDO) have been incorporated into a new Regional Monitoring Plan. Starting April 6, 2015, new CSDO data will be stored in the Historical Bacteriological Quality Water Quality files found above.
The National Pollutant Discharge Elimination System (NPDES) Municipal Stormwater Permit, issued by the San Diego Regional Water Quality Control Board to Orange County and the incorporated cities of South Orange County, requires routine bacteriological monitoring of coastal storm drains and their respective ocean receiving waters. Pursuant to these requirements, a monitoring program was developed by the County and approved by the Regional Board. Samples are collected weekly during dry weather from the major storm drains, and in the surf zone 25 yards upcoast (northerly direction) and 25 yards downcoast (southerly direction) of the respective drain-ocean interface. The intent of this monitoring is to evaluate the impacts (magnitude and trends) of urban runoff to the coastal zone. |
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Acronyms and Directions to Download Coastal Storm Drain Outfall Program Data |

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Coastal Storm Drain Outfall Program – 2015 |
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Coastal Storm Drain Outfall Program – 2014 |
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Coastal Storm Drain Outfall Program – 2013 |
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Coastal Storm Drain Outfall Program – 2012 |
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Coastal Storm Drain Outfall Program – 2011 |
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Coastal Storm Drain Outfall Program – 2010
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Coastal Storm Drain Outfall Program – 2009
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Coastal Storm Drain Outfall Program – 2008 |
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Coastal Storm Drain Outfall Program – 2007 |
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Coastal Storm Drain Outfall Program – 2006 |
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Coastal Storm Drain Outfall Program – 2005
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Coastal Storm Drain Outfall Program – 2004
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