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Wet Weather Percolation/Groundwater Testing

Maps showing area boundaries and
groundwater test guidelines are available.		 eSubscribe logo Subscribe to Percolation/Groundwater Testing updates.
Area
 Total Required Total to Date Groundwater Perc
Petaluma 12.5"
4.67"
 Closed Closed
Sonoma 15"
5.98"
 Closed Closed
Santa Rosa 15"
6.65"
 Closed Closed
Sebastopol 17.5"
6.06"
 Closed Closed
Guerneville 25"
10.55"
 Closed Closed
Healdsburg 20"
10.97"
 Closed Closed
Cloverdale 20"
7.96"
 Closed Closed

This information is updated when open dates change - date is shown at bottom of this page.

The Memorandum of Understanding with the State of California Regional Water Quality Control Board allows for wet weather percolation and groundwater testing between January 1 and March 1, and after having received 50% of the average rainfall.

Depth to groundwater determinations can be conducted within ten (10) calendar days following a rainfall of 0.8 inches in a 48 hour period. Sonoma County is divided into 7 geographic areas for this purpose. The amount of rainfall will be posted for each area.

 
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Permit and Resource Management Department County of Sonoma