Sonoma County Code, Sections 7-12, 25-17, 25-56, and 26-88-060H, requires dry weather well testing for issuance of building permits for new dwellings located in marginal or scarce water zones. The testing must demonstrate a sustained yield of one gallon per minute per dwelling from a well, spring, or multiple wells or springs combined.
Dry weather testing is required for the following:
- New or replacement dwelling in scarce water zone four (4) or
- Second dwelling in marginal water zone three (3)
- As required to comply with Health and Safety Conditions from Project Review Staff