Short answer: Gurgling can indicate restricted drainage, a plumbing vent issue, a full or obstructed tank path, or a septic system that is beginning to fail.
Look for other symptoms
EPA lists gurgling with backups, slow drains, standing water, odors, and spongy drainfield soil among potential warning signs of a failing septic system.
Do not keep adding water
If several fixtures are affected, reduce wastewater use until the cause is evaluated. Continuing laundry, showers, and other high-flow use can worsen a backup.
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What to verify locally
Permitting, inspection, setbacks, acceptable system types, professional licensing, and design requirements are controlled by state and local authorities. If your question affects construction, a property purchase, a repair, or drinking-water safety, confirm the answer with the local health/environmental department.
Primary reference
U.S. EPA — Frequent Questions on Septic Systems ↗
U.S. EPA — How to Care for Your Septic System ↗
Reviewed August 26, 2026.