USDA loan septic and well requirements when a home is sold
A USDA Rural Development guaranteed loan requires acceptable water and wastewater systems. The lender must obtain a septic evaluation for a property on a private system, and the system must be free of observable evidence of failure. For a private well, a water quality test is required for every well-served property; it must be performed by the local health authority or a state-certified laboratory, and the water analysis report must be no more than 180 days old at loan closing.
Verified against USDA Handbook HB-1-3555, Chapter 12 (§12.6), 2026-09-10. General information. Your lender applies the current handbook.
Septic — the evaluation
- The lender is required to obtain a septic evaluation. It may be done by a qualified appraiser who certifies the property meets HUD Handbook 4000.1, a government health authority, a licensed septic system professional, or a qualified home inspector.
- The system must be free of observable evidence of failure.
- Additional inspections can be required based on what the evaluation finds.
- A private system that already meets HUD Handbook 4000.1 (per a qualified appraiser) does not need further septic certification, but the well-to-septic separation still has to be measured.
Private well — the water test
- Required for every well-served property. A government agency or a certified lab must handle the analysis. (The federal Safe Drinking Water Act does not cover private wells; call the EPA Safe Drinking Water Hotline at 800-426-4791 for certified-lab referrals.)
- The water must meet state or local standards; where there are none, EPA maximum contaminant levels apply.
- Report age: no more than 180 days old at loan closing. A new report can be required if a recent event (chemical spill, natural disaster) may have made the earlier one invalid.
- Well-to-septic separation must be measured and must meet HUD Handbook 4000.1 or be acceptable to the local/state health authority. Missouri (19 CSR 20-3): 100 feet well to drainfield, 50 feet well to tank.
The county rule can add to this. A Missouri county may require its own septic and/or well inspection at transfer regardless of the loan — see your county.
Sources & last verified
- . Checked 2026-09-10.
- (referenced by HB-1-3555). Checked 2026-09-10.
- (Missouri setbacks). Checked 2026-09-10.
Corrections: corrections@homecleared.com.