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Well & Septic Handouts/Forms/Applications

There are some duplicate CNI (Construction Inspection) and BPC (Building Plan Check) handouts due to building code changes that became effective January 1, 2008. The version including an x in the title of the form is to be used only for construction projects that were submitted prior to January 1, 2008. For example: Special Inspection and Testing Procedure, CNI-010x (Pre Jan 1 2008 Projects). For all projects submitted on or after January 1, 2008, refer to the form without an x in the title.

Some of these documents are saved in Portable Document Format (PDF). We recommend you download Adobe® Reader®, a free software that allows you view and print PDF files.

For accessibility assistance with these documents, please contact the Sonoma County Permit and Resource Management Department (PRMD) at (707) 565-1900.


Please note: Although PRMD is continuously working to maintain these documents, some may not reflect the requirements of the currently adopted, triennial code cycle. Please make use of the revision date in the footer of the document as a guide to identifying the currency of a particular document.



WLS-010 Certification of Water Yield in Water Scarce Areas
WLS-011 Disinfecting Wells
NPD-007 Dry Season Best Management Practices for Construction Sites
WLS-012 Guidelines for Maintaining a Nonstandard Pressure Distribution Septic System
WLS-014 How to Monitor A Non-Standard Septic System
WLS-017 Landscape Guidelines for Nonstandard Septic Systems
WLS-013 Maintenance Guidelines for Toilets on Nonstandard Sewage Disposal Systems
CSS-019 Minimum Standard Site Plan
WLS-016 Non-Standard Septic System Reduced Annual Operational Permit Fee
NPD-005 Preliminary Storm Water Mitigation Plan Worksheet
WLS-015 Procedure for Purging and Adjusting a Pressure Distribution Septic System
NPD-002 Protection of Stormwater Quality on Construction Sites
WLS-028 Percolation Test Approved
WLS-007 Percolation Test Not Approved
ACT-001 Refund Request
WLS-034 Septic Plan Check Contractor Acknowledgment
WLS-008 Septic System Application Requirements
WLS-002 Septic Tank Destruction Permits
NPD-004 Standard Urban Storm Water Mitigation Plan Questionnaire
NPD-003 State Water Resources Control Board General Permit Requirements


Although every effort is made to provide complete and accurate information on this website, users are advised to contact appropriate Permit Sonoma staff before making project decisions. This may involve contacting more than one section within Permit Sonoma(e.g. Building, Plan Check, Zoning, Well & Septic, etc.) since each section implements specific codes or ordinances which may affect your project.
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Permit and Resource Management Department County of Sonoma