What it means
Inspectors fill or seal the tank and monitor liquid levels for a set time to verify watertight construction. Failed tests require repair of cracks, joints, or pipe penetrations before approval.
Watertight tanks protect groundwater and maintain proper hydraulic retention time for settling. Leaking tanks add storm water load and dilute treatment.
Why it matters in Santa Cruz County
Santa Cruz County Environmental Health may require watertightness testing on new tank installs, especially in high groundwater areas near the coast and river bottoms.
Homeowner tip
If a new tank test fails, demand repairs and a retest before burying the tank.
Related Wade's services
Related glossary terms
Also explore the Plumbing Glossary or call 831.225.4344 with questions about your property.