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Wet Weather Percolation/Groundwater Testing
| Maps showing area
boundaries and groundwater test guidelines are available. |
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Subscribe to Percolation/Groundwater Testing updates. |
| Area |
Total Required | Total to Date | Groundwater | Perc |
| Petaluma | 12.5" | na
|
Closed | Open until 3/19/08 |
| Sonoma | 15" | na |
Closed | Open until 3/19/08 |
| Santa Rosa* | 15" | 23.38" |
Closed | Open until 3/19/08 |
| Sebastopol | 17.5" | na |
Closed | Open until 3/19/08 |
| Guerneville | 25" | na |
Closed | Open until 3/19/08 |
| Healdsburg | 20" | na |
Closed | Open until 3/19/08 |
| Cloverdale | 20" | na |
Closed | Open until 3/19/08 |
* Due to loss of long established rainfall stations, until further notice, Santa Rosa rainfall totals will be used for all areas. |
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This information updated when open dates change - date is shown at bottom of this page. |
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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.