Need a perc test or a septic design in Monterey County, CA? Monterey County has about 436,251 residents (2024 estimate) and 12 incorporated cities and towns. Describe your project once: perc test and septic design pros who work in Monterey County get back to you.
The local health department is the authority that reviews perc tests and septic permits for most of Monterey County.
Services available in Monterey County
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Perc test and soil evaluation
Percolation test and soil evaluation on the lot, required by the health department before a septic permit is issued.
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Septic system design
Design of the septic system from the soil results, submitted with the permit application.
Frequently asked questions in Monterey County
Do perc test and septic design pros cover the whole of Monterey County?
Most pros work across the county and neighboring counties. Enter your ZIP code in the form and we match you with pros who serve your exact area.
Perc Testing in California: all counties
Source: U.S. Census Bureau, Population Estimates Program (Vintage 2024) and Gazetteer Files (public domain), imported on 10/31/2026. Figures describe the incorporated place or county as published; they are shown for information only.