Precast concrete
1,500 Gallon Concrete Septic Tank Dimensions | A.J. Foss
The A.J. Foss 1,500-gallon precast concrete septic tank measures 10 ft 10 in × 5 ft 7 in × 5 ft 8 in outside and weighs 12,500 lb. This size chart is model-specific; other tanks can differ, so use the drawing for excavation.
| Specification | US customary | Metric |
|---|---|---|
| Exterior length × width × height | 10 ft 10 in × 5 ft 7 in × 5 ft 8 in | 3.3 m × 1.7 m × 1.73 m |
| Rated liquid capacity | 1,500 US gal | 5,678 L |
| Shipping weight | 12,500 lb | 5,670 kg |
| Liquid per vertical unit | 31 US gal/in | 46.2 L/cm |
- Access covers
- 2
- Delivery assembly
- Preassembled
Check
Site preparation and access checks
Use the product footprint as the starting point; the installer and local authority must set the excavation, access, and load requirements.
| Check | What to verify |
|---|---|
| Product footprint | Start with 10 ft 10 in × 5 ft 7 in × 5 ft 8 in. Working room, bedding, and trench geometry are not specified here. |
| Delivery and access route | Confirm gate width, overhead clearance, turning space, surface condition, and future pumping access. |
| Handling and placement | At about 12,500 lb, plan delivery/set equipment and confirm whether the model arrives assembled. |
| Burial depth and covers | Confirm model-specific burial depth, risers, cover loading, water table, and backfill in the drawing and permit. |
| Driveway / vehicle loading | Do not infer traffic rating from material. Use the rated cover/configuration and have the designer confirm loads. |
Boundary: product pages provide model data, not a universal excavation or traffic plan. Cross-check the cover/load guidance and EPA access guidance: EPA septic FAQs
What this chart establishes
This is one New England product specification. The dimensions are exterior measurements and do not show wall thickness, baffles, freeboard, burial depth, traffic rating, or the clearance required by an installer.
Use the right measurements
Use the model drawing and permit record for excavation or replacement work. To estimate liquid volume, enter internal length, width, and liquid depth in the volume calculator.
Open the septic tank volume calculator Septic Tank Size CalculatorCompare another capacity
Common questions
What are the dimensions of a 1,500-gallon septic tank?
The A.J. Foss concrete example on this page measures 10 ft 10 in × 5 ft 7 in × 5 ft 8 in outside, or about 3.3 m × 1.7 m × 1.73 m. Confirm the drawing for the exact model you are buying or servicing.
Are all 1,500-gallon septic tanks the same size?
No. The gallon rating describes liquid capacity. Material, wall thickness, compartments, structural rating, and manufacturer can change the exterior dimensions.