When tank-only replacement makes sense
If you have a CNY septic system that is 30+ years old and you are starting to see problems, the question is always: is it the tank, the field, or both? Tank-only replacement is the right call when:
- Tank is cracked, collapsed, or leaking but the leach field still accepts water
- Tank is undersized for current household use (older 500 to 750 gal tanks)
- Steel tank is rusting through (anything pre-1980 is high-risk)
- You are selling and the inspection flagged the tank but not the field
- Effluent filter alarm keeps tripping due to tank baffle failure
When it does NOT make sense
- Effluent surfacing in the yard (field is failing, replacing the tank won't help)
- Sewage backups in the house after recent pumping (field is hydraulically failed)
- Tree roots have invaded the field, not just the tank
- You are within 5 years of a full replacement anyway (combine work to save mobilization)
We walk every job before pricing. Half the time, a homeowner calls expecting a full $20K replacement and we tell them the tank is the only problem and they save $14K. The opposite happens too.
What's included
- Locate and uncover existing tank
- Pump old tank (we coordinate with a licensed pumper)
- Crush and remove old concrete or steel tank
- Install new 1,000 or 1,250 gallon two-compartment concrete tank
- New effluent filter
- New risers to grade (no more digging to find the lid)
- Reconnect inlet from house and outlet to existing distribution box
- Backfill, restore topsoil, seed
- County health inspection coordination
- As-built drawing
Tank size by household
| Bedrooms | Minimum tank size (NY code) | What we recommend |
|---|---|---|
| 2 or 3 | 1,000 gal | 1,000 gal |
| 4 | 1,250 gal | 1,250 gal |
| 5 or 6 | 1,500 gal | 1,500 gal |
| Vacation home (intermittent use) | 1,000 gal | 1,250 gal (extra capacity helps biology recover) |
Pricing
| Job | Typical price |
|---|---|
| 1,000 gal tank replacement, standard access | $3,500 to $4,500 |
| 1,250 gal tank replacement, standard access | $4,000 to $5,200 |
| Tank + risers + new effluent filter | +$350 to $600 |
| Long access, driveway crossing, or tight lot | +$500 to $1,500 |
| Steel tank removal (extra dismantling) | +$300 to $700 |
How long it takes
Most tank-only replacements are a one-day job. We arrive at 7 AM, the new tank is in by lunch, lines are reconnected and backfilled by 4 PM, and you are flushing toilets that night. The seed-and-grow part of the yard takes 4 to 6 weeks to fully restore.
Watch out for
- Contractors who quote tank-only without inspecting the field. The field is what fails 70% of the time.
- Anyone offering a "concrete patch" on a cracked tank. That is not legal in NY for residential septic.
- Replacing without upsizing if your household grew. A 750 gal tank is undersized for any modern 3-bed home.