What is the County's responsibility in maintaining private drainage systems?

Contra Costa County has 31 major watersheds and sub-watersheds containing more than 1,300 miles of creeks and drainages. Of that total, the County maintains approximately 75 miles of improved creeks and drainages. The rest is the responsibility of private property owners.

The County maintains only those drainage facilities required as a condition of development constructed to standards applicable at the time of construction and located in an easement or other land right accepted by the County. Creek maintenance is the responsibility of the owner whose property abuts a creek.

When the creek area is not properly maintained, the resulting obstructions can lead to increased flooding, changes in the course of the creek, and increased erosion on the obstructed property and/or downstream properties. For more information on the Division 1010 of the Title 10 County Ordinance Code visit the Contra Costa County Ordinance Code Title 10 Public Works and Flood Control webpage. Review the Public Works Creek Maintenance Program Information (PDF) document for guidelines for private creek maintenance.

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1. What is the County's responsibility in maintaining private drainage systems?
2. Who do I contact if I have flooding on my street?
3. Why doesn't the County maintain the culvert / ditch behind my house?