The dry weather testing season for well pump tests (aka well yields) is from July 15 to October 1 of each year. The dry weather testing season may be extended by the director of Permit Sonoma as authorized by Sonoma County Code Section 7-12 (c).
Springs and Shallow Wells
Closed as of Tuesday, October 1, 2019
Shallow wells are wells that are equal to or less than 50 feet deep. Dry weather testing for springs and shallow wells ends on October 1.
Closed as of Friday, December 6, 2019
Deep wells are wells that are greater than 50 feet. The dry weather testing season for deep wells may be extended beyond October 1 up until the County-wide average rainfall is between five and six inches.
The County-wide average rainfall is based on the rainfall totals reported in the Press Democrat at the 12 rain gauge locations identified in the table below. Dry weather testing for deep wells shall close after the County-wide average rainfall exceeds five inches (5").
Updated: December 6, 2019
County-Wide Average: 5.18 inches