Tanks · baffles · lids · risers
Septic tank repair in Chattanooga
A concrete tank can last 50 years or more, but its parts don't. Baffles rot out, lids crack, inlet and outlet pipes shear at the tank wall. The good news: when the tank shell is sound, these are among the cheapest septic repairs there are.
The repairs tanks need most often
- Baffles. The baffles (or sanitary tees) keep floating scum in the tank and off your field lines. When the outlet baffle deteriorates, which is common in older concrete tanks, solids escape straight into the drain field and start killing it. Replacement typically runs $300–$900 nationally, against thousands for the field damage a missing baffle causes.
- Lids and risers. Cracked or unsafe lids are a hazard as well as an odor path; replacements run roughly $150–$500. Adding risers while the tank is open makes every future pump-out cheaper because nobody has to dig.
- Inlet and outlet piping. Settling clay shifts pipes at the tank wall; a broken inlet backs sewage up the house line even when tank and field are fine.
- Structural problems. A collapsing or actively leaking tank calls for replacement rather than repair. See installation & replacement.
Tank repairs overall average about $2,000 nationally, with most jobs landing between $750 and $3,000. The cost guide has the full table with sources.
Tank problem or field problem?
Plenty of tank-repair calls turn out to be something else. A useful rule: if pumping the tank fixes the symptoms for months, the tank or its plumbing is suspect; if backups return within days of a pump-out, the field usually can't take water, and that's field line territory. A company that works both will check tank levels and the field before quoting either.
Permits and who's allowed to do the work
In Tennessee, repair permits are required when installing tanks (septic or dosing) or absorption line to correct a failure, and anyone in the business of septic repair must hold an annual TDEC installer permit. Pump trucks need their own state septage-removal permit. There's no state fee for the repair permit itself; the repair inspection is $100. On the Georgia side, the county health department permits repairs and the contractor must be state-certified. Details on the North Georgia page.
Make the repair last
The same EPA guidance that applies everywhere applies double on Chattanooga clay: pump every 3–5 years (about $290–$560 a visit), flush nothing but human waste and toilet paper, and keep grease out of the drains. Skipped pump-outs are a documented cause of solids reaching and clogging the drain field.
Sources for this page
- Fixr — septic tank repair costs: baffles, lids, averages (as of Jan 2025) — https://www.fixr.com/costs/septic-tank-repair
- EPA — Frequent questions (concrete tank lifespan 50+ years) — https://www.epa.gov/septic/frequent-questions-septic-systems
- EPA — How to care for your septic system (pumping every 3–5 years, what not to flush) — https://www.epa.gov/septic/how-care-your-septic-system
- EPA — Resolving septic system malfunctions (skipped pump-outs clog the field) — https://www.epa.gov/septic/resolving-septic-system-malfunctions
- TDEC Rule 0400-48-01 (repair permits when installing tanks to correct failures; pumper permits) — https://publications.tnsosfiles.com/rules/0400/0400-48/0400-48-01.20140408.pdf
- This Old House — septic pumping costs (as of May 2026) — https://www.thisoldhouse.com/plumbing/reviews/cost-to-pump-septic-tank