2024 Season - Wet Weather Groundwater Determinations & Percolation Testing: Open in Most Areas
Published: March 25, 2024
Groundwater determinations and percolation testing are necessary for onsite wastewater treatment systems (OWTS) in unincorporated Sonoma County.
- Groundwater determinations are reopened in almost all testing areas, and are closed in the Petaluma testing area.
- Percolation testing is extended in all testing areas.
(Testing areas: Cloverdale, Guerneville, Healdsburg, Petaluma, Santa Rosa, Sebastopol, and Sonoma)
Rainfall totals data and/or testing dates are valid as of March 25, 2024.
More Information: Wet Weather Groundwater Determinations & Percolation Testing