Site
Soils, percolation, and hillsides
A pretty tank bid is incomplete if nobody has looked at the soil under the proposed field.
This is an independent referral guide. It connects homeowners with independent providers and may receive compensation. It is not a licensed contractor and it does not do the work.
Perc testing is a separate county permit
DEHQ publishes a percolation test and soil profile permit. The application and a test hole diagram go in before the holes are dug. After the permit is issued, the tester schedules an inspection with at least 48 hours of notice. Results and a revised diagram come back to the county.
County guidance also says sites with slopes over 25 percent must include a slope stability report or statement from a licensed civil engineer or geologist with the layout. Deep beds and vertical pits are restricted to specific soil and groundwater conditions. They are not the default on a Fallbrook hillside.
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Questions on this service
Can this guide read my perc results?
No. A qualified professional and DEHQ do that. Fast or very slow rates both change the design.
Describe the failure
Say Fallbrook, Bonsall, Pala, or Rainbow, and whether sewage is backing up or the ground over the field is wet.