Yes, there are responsibility ordinances in every county in California regarding who is responsible for water coming across your property lines into a neighbor's property - either down hill or next door. Any damage or erosion to your neighbor's property because of your drainage is your responsiblity. Does that answer your question? all the best, Liz... more
The Marin County Community Development Agency is responsible for Planning, Building and Environmental Health. Building inspections are handled through their office as well as all permitting. Contact them directly.