State Requirements
Iowa Septic Tank Requirements
Complete guide to septic system requirements in Iowa (IA). Use our calculator for personalized recommendations.
Regulatory Agency
Iowa Department of Natural Resources
Permit Required
YesProfessional Install
RequiredMinimum Tank Size
1,000 gal
Tank Size Requirements
| Bedrooms | Min Tank Size | With Garbage Disposal |
|---|---|---|
| 3 | 1,000 gal | 1,500 gal |
| 4 | 1,250 gal | 1,875 gal |
| 1-2 | 1,000 gal | 1,500 gal |
| 5-6 | 1,500 gal | 2,250 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
225
sq ft minimum
Clay
350
sq ft minimum
Iowa Specific Notes
- Time of transfer inspections required in many counties
- Alternative systems may be needed for clay soils
Regulatory Contact
Iowa Department of Natural Resources
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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