Well test for a closing
You are under contract on a place with a well, the lender wants a water test, and there is a date on it. Here is what they actually require and what happens if it fails.
What the loan programmes want
FHA, VA and USDA all require the water to meet health and safety standards before the loan closes. The basic panel is the same across them:
- Total coliform bacteria
- E. coli
- Nitrate and nitrite
- Lead
Two details catch people out. The sample has to be collected by a state-certified lab technician, a county health official or an independent third party, so the seller cannot fill a bottle at the kitchen tap and post it off. And on a VA loan the result is only good for 90 days, so a test run early in a slow closing can expire before you get to the table.
What it costs
In North Carolina, the basic loan panel runs about $150 to $350. Wider panels, adding things the lender does not require but a buyer might want, run up to around $800. In an agricultural county the nitrate number on that report is worth reading for its own sake rather than as a box the lender ticks. Why nitrate matters here.
When it fails
This is the part worth knowing before it happens, because it is usually survivable.
A positive bacteria result is treated as a correctable condition, not a dead deal. The programmes generally want documented corrective action followed by a retest. In practice that means disinfecting the well, commonly by shock chlorination, flushing the system through, and sampling again once the chlorine is gone.
Time is the real enemy here, not the bacteria. Disinfection, flushing and a retest with a certified collector takes days, not hours, and it has to land inside your closing window. If the first result is positive, start the second round the same day rather than waiting to see what the lender says.
A failed nitrate result is a different matter. Nitrate is not fixed by chlorination, and the answer is treatment or a better well rather than a flush. What nitrate is and what actually removes it.
The other thing to check, which nobody tells buyers
A water test says the water is clean today. It says nothing about whether the well was ever permitted. Robeson County Health Department publishes a Permit Inquiry Form for Real Estate Transactions exactly for this, and it costs you a form rather than a lab fee.
An unpermitted well is not usually a disaster, but it is much better found now than after you own it. What needs a permit here.
Before you waive anything
The lender's panel is a minimum, not an inspection. It says nothing about whether the pump is near the end of its life, whether the casing and cap are sound, or how deep the well is, and all three decide what you will spend in your first two years in the house. What that spending looks like, and the pump is usually the big one.
Common questions
Who pays for the well test?
Negotiable and usually settled in the contract. It commonly falls to the buyer as part of due diligence, but on a VA loan in particular it is worth checking, because who pays for which items is more prescribed there.
How long does the result take?
Bacteria cultures need incubation time, so a certified result is typically days rather than same day. Build that into the closing timeline, and build in a second round in case the first one comes back positive.
The house has been empty for months. Does that matter?
Yes, and it is a common reason for a positive result on a well that is basically fine. Water sitting still in a system is not the same as water being drawn through it. It usually clears with disinfection and flushing, which is exactly the corrective action the lender will ask for anyway.
Sources: FHA, VA and USDA private well requirements for residential lending; North Carolina well water testing cost data for 2026. Requirements change and lenders add their own overlays, so treat this as what to expect rather than as your lender's final word.