HomeAdvisor's normal range for septic tank repairs is $627 to $3,043, about $1,828 on average, with major repairs at $6,500 or more (HomeAdvisor, June 19, 2026). What breaks matters more than anything else: a baffle is a few hundred dollars, a broken line can be several thousand, and a failed drain field is a replacement-level job. If you need a technician to diagnose the problem, HomeAdvisor's repair guide budgets about $100 to $200 for a standard inspection or $250 to $1,175 if a camera is needed (HomeAdvisor, June 19, 2026). Its separate inspection guide prices full inspections higher (see inspection cost).
Compare against the cost of a new system →
| Repair | Typical cost (range) | What it does |
|---|---|---|
| Baffle | $300 – $900 | Keeps solids from clogging the inlet and outlet |
| Pump repair | $250 – $400 | Moves effluent to the field (pumped systems only) |
| Pump replacement | $1,000 or more | When the pump is beyond repair |
| Effluent filter | $200 – $300 | Keeps solids out of the drain field |
| Broken pipe (average) | about $600 | — |
| Lateral line (cracked/broken) | $1,500 – $5,000 | — |
| Lid | $150 – $500 | Keeps gases in and people out |
All rows from (HomeAdvisor, June 19, 2026). HomeAdvisor's installation guide prices several of the same items differently: pump replacement $800 to $1,400, baffle $300 to $500, filter $230 to $280, lid $30 to $70 (HomeAdvisor, June 20, 2026). Treat these as ranges, not prices.
| Tank | Repair range |
|---|---|
| Plastic | $150 – $2,000 |
| Concrete | $700 – $5,000 |
| Fiberglass | $750 – $7,500 |
(HomeAdvisor, June 19, 2026). HomeAdvisor says the plastic range includes labor; it doesn't say for the others.
A failed drain field is the expensive case. A broken lateral line is a repair ($1,500 to $5,000) (HomeAdvisor, June 19, 2026), but EPA warns a clogged field may need replacing entirely (EPA, March 11, 2026) (see drain field replacement cost). For the tank, HomeAdvisor's "50% rule" says that if repair costs exceed half the cost of replacement, replacing may be more cost-effective. The guide states it both against a new tank and against a new system (HomeAdvisor, June 20, 2026). See septic tank replacement cost.
The calculator gives an itemized installed-cost estimate for your bedrooms, system type, soil and state.
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