Septic inspection, pumping, repair or replacement in Sonoma County, CA: describe your project once and contractors who work in Sonoma County get back to you. Sonoma County has about 485,375 residents (2024 estimate) and 9 incorporated cities and towns; many homes outside them rely on septic systems.
Permits for new and repaired systems are generally issued by the county or state health department serving Sonoma County.
Services available in Sonoma County
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Septic inspection
Inspection of the tank and drain field, often requested when a home is sold or by the local health department.
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Septic tank pumping
Pumping the solids out of the tank. EPA notes household tanks are typically pumped every three to five years.
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New septic system design and installation
Soil and percolation testing, system design, permit and installation for a new home or a replacement system.
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Septic repair
Diagnosis and repair of backups, odors, a failing drain field or damaged components.
Frequently asked questions in Sonoma County
Who issues septic permits in Sonoma County?
In most of California, onsite wastewater permits are issued by the county or state health department. Your contractor files the application or tells you how.
Septic Services 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.