Wet Weather Percolation/Groundwater Testing
Wet Weather Percolation/Groundwater Testing for 2016-2017 Season
This information in the table above is updated when open dates change. The latest updates to the data are displayed in bold above. Data have been updated .
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.
Inspection requests for wet weather percolation/groundwater tests must be made by calling the County’s automated inspection request system, SELECTRON, at (707) 565-3551.
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