State Requirements
Rhode Island Septic Tank Requirements
Complete guide to septic system requirements in Rhode Island (RI). Use our calculator for personalized recommendations.
Regulatory Agency
Rhode Island Department of Environmental Management
Permit Required
YesProfessional Install
RequiredMinimum Tank Size
1,000 gal
Tank Size Requirements
| Bedrooms | Min Tank Size | With Garbage Disposal |
|---|---|---|
| 3 | 1,250 gal | 1,875 gal |
| 4 | 1,500 gal | 2,250 gal |
| 1-2 | 1,000 gal | 1,500 gal |
| 5-6 | 2,000 gal | 3,000 gal |
Drainfield Sizing by Soil Type
Minimum square feet of absorption area based on soil percolation rate:
Gravel/Sandy
125
sq ft minimum
Sandy
175
sq ft minimum
Loam
250
sq ft minimum
Clay
350
sq ft minimum
Rhode Island Specific Notes
- Small lot sizes require careful planning
- Coastal areas have stricter requirements
- High groundwater common
Regulatory Contact
Rhode Island Department of Environmental Management
Important Disclaimer
This information is provided for reference only. Local county or city requirements may be stricter than state minimums. Always verify requirements with your local health department before installation.
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