Water Test Mortgage 2026: When FHA and VA Require Well Water Testing and What Fails

Properties served by a private well rather than a public water supply require specific testing under government-backed loan programs. The standards exist because private wells are not regulated by municipal utilities and the borrower is personally responsible for water safety. Understanding the requirements prevents last-minute conditions at closing.

FHA Requirements

For FHA-insured loans, properties with private wells must have a water test that meets the state or local health authority requirements at minimum. At minimum, FHA requires testing for bacteria (coliform) and nitrates. Zero coliform bacteria is the required result for bacteria. Nitrates must test below the EPA action level of 10 milligrams per liter. If a state or local health code requires additional testing such as lead, arsenic, or other contaminants, the FHA file must include that testing as well. The test must be conducted by a licensed or approved testing laboratory.

VA and USDA Requirements

VA requires water quality testing for properties with private well systems that will serve as the primary water source. The test must confirm the water meets minimum property requirements. USDA Section 502 loans follow similar standards: private wells must be tested for bacteria, nitrates, and any additional parameters required by state or local standards. USDA may require retesting or additional parameters in areas with known agricultural contamination from pesticide runoff or nitrogen from fertilizers.

When Tests Fail

• ✦Bacteria contamination: shock chlorination of the well is the common first step; retest after 30 days. If bacteria recur, filtration or UV treatment systems may be required.
• ✦Nitrate levels above 10 mg/L: most commonly caused by agricultural runoff. Reverse osmosis systems can bring levels below the threshold; lender must confirm the system is installed and functional before closing.
• ✦Additional contaminants: arsenic, lead, or other contaminants found above EPA limits require treatment systems and verified post-treatment testing.
• ✦Shared wells: FHA and VA require a shared well agreement be recorded in the county land records. Ensure it is in place before the appraisal.