Well Water & Real Estate

Buying or selling a property with a private well involves disclosures, inspections, and water quality tests that are not required for municipal water properties. Requirements vary significantly by state.

What to do before buying a property with a private well

Do not rely solely on the seller's disclosure

Seller disclosure requirements for well water vary widely by state, and even where disclosure is required, sellers may only be obligated to report known issues. A seller who has never tested their well cannot disclose what they don't know. Always conduct independent testing as part of your due diligence.

Recommended pre-purchase testing

At minimum, commission the following tests before closing:

  • Total coliform and E. coli — mandatory; non-negotiable for a property you are about to move into
  • Nitrate — especially if the property is in an agricultural area; critical if there will be infants in the home
  • Basic chemistry panel — pH, hardness, iron, manganese, TDS; informs treatment and plumbing condition
  • Arsenic — if in the Upper Midwest, New England, or western states; naturally occurring, no taste or odor
  • Lead — first-draw sampling; especially relevant for homes built before 1986

If the property is near a military base, airport, chrome-plating shop, or other industrial site, add PFAS and total chromium/hexavalent chromium to the panel. These are not included in standard water test packages and require separate certified analysis.

Well construction and condition inspection

Water quality alone doesn't tell you about the well's condition. A licensed well inspector can assess:

  • Well age, depth, and casing material
  • Wellhead seal integrity (cracks allow surface water intrusion)
  • Static water level and pump performance (yield test)
  • Distance from septic system, fuel storage, and agricultural activity
  • Local well records (available from state geological surveys in most states)

Financing: FHA and USDA loan requirements

If you are using FHA or USDA Rural Development financing on a property with a private well, water quality testing is required by the lender, not optional. Minimum requirements typically include coliform bacteria and nitrate; some lenders require a broader panel. The property cannot close if water quality fails — address this with the seller before finalizing the purchase contract.

Negotiating based on water test results

If testing reveals elevated contaminants, you have several options:

  • Request that the seller install an appropriate treatment system before closing
  • Negotiate a price reduction to cover treatment costs
  • Request a treatment allowance held in escrow until a follow-up test confirms the system is effective
  • Walk away if the contamination source cannot be remediated (e.g., off-site PFAS plume with no effective treatment option at that scale)

Learn what each contaminant means for your health and treatment options

Find a certified lab and learn how to collect a proper sample

What sellers with a private well should know

Know your disclosure obligations

Most states with significant private well populations require sellers to disclose known water quality issues, well age, or the existence of a private well system. Requirements vary — see the State Requirements tab for your state. When in doubt, disclose. Non-disclosure of a known water quality problem can result in litigation after the sale.

Test before listing

Proactive testing before listing your property gives you time to address issues and provides documentation that builds buyer confidence. A recent (within 12 months) certified lab water test result is a selling asset — buyers will require testing anyway, and having results ready removes a contingency obstacle.

At minimum, test for:

  • Total coliform and E. coli
  • Nitrate
  • A basic chemistry panel (pH, hardness, iron, manganese)
  • Arsenic, if you are in a state with elevated natural occurrence

If you have existing treatment equipment

Document all treatment systems: type, installation date, service history, and most recent filter/media change. Provide the buyer with manufacturer manuals and maintenance records. A well-documented treatment system is an asset; an undocumented or poorly maintained one is a liability.

If a test reveals a problem

A positive E. coli result or an MCL exceedance does not necessarily kill the sale, but it must be disclosed and addressed. Options include:

  • Shock chlorination and retest for bacterial issues
  • Installation of a certified treatment system for chemical contaminants
  • Reduction in sale price reflecting the cost of treatment

Note: for chronic risk contaminants (arsenic, PFAS, lead), appropriate point-of-use reverse osmosis treatment is typically effective and inexpensive relative to home value. Addressing the issue proactively avoids renegotiation leverage at closing.

Learn what each contaminant means for your health and treatment options

Find a certified lab and learn how to collect a proper sample

State-by-state well water disclosure requirements

Disclaimer: State statutes change. This table reflects our best understanding of requirements as of early 2026 and is provided for general orientation only. It is not legal advice. Verify current requirements with a licensed real estate attorney in your state before any transaction.

State Disclosure Required? Testing Required at Sale? What Is Required
Michigan Yes No (recommended) Seller must disclose known well and septic system defects; water test results must be shared if available; no mandatory pre-sale testing under state law (some lenders require it)
Wisconsin Yes No (recommended) Real Estate Condition Report requires disclosure of known well defects; DATCP recommends but does not require water testing at sale
New Jersey Yes Yes Private Well Testing Act (PWTA) requires testing within 5 years of sale for bacteria, nitrate, pH, and a broader analyte panel including VOCs and metals; results shared with buyer and NJDEP
Connecticut Yes Yes (for some) PA 21-37 requires testing for certain properties; at minimum, bacteria and nitrate; buyers may request broader testing
Pennsylvania Yes No (lender may require) Seller disclosure form includes well and water supply information; FHA/USDA loan programs require testing; no statewide mandatory pre-sale testing law
Maine Yes No (recommended) Property disclosure form requires disclosure of known well issues; State strongly recommends arsenic and radon testing given geology
New Hampshire Yes No (recommended) Standard disclosure form; NHDES strongly recommends arsenic, radon, and nitrate testing at time of sale
Virginia Yes No Residential Property Disclosure Act covers well and septic systems; no mandatory testing requirement; lender requirements may apply
California Yes No (varies by county) State TDS Act requires testing for TDS in some counties; some counties have additional requirements; check local ordinances
Texas Yes No Seller's Disclosure Notice covers water supply type; no statewide mandatory water quality testing at sale
Minnesota Yes No (lender may require) Seller disclosure covers well system; Well Disclosure Certificate required at sale documenting well location, depth, and status; no mandatory water quality testing
Iowa Yes No Seller disclosure requires well and septic information; voluntary testing strongly encouraged; no statewide mandatory requirement
Illinois Yes No Residential Real Property Disclosure Act covers well systems; some counties have local testing requirements; no statewide mandate
Ohio Yes No Residential Property Disclosure Form includes well and septic; no statewide mandatory water quality testing
New York Yes No (varies by county) Property Condition Disclosure Statement covers water supply; some counties have local well testing programs; no statewide mandatory pre-sale testing

States not listed above generally require standard property disclosure (that a private well exists), but do not mandate water quality testing at sale. FHA, USDA Rural Development, and VA loans have their own testing requirements that apply regardless of state law.

Find your state's current requirements

For current, authoritative state requirements, consult:

  • Your state's Department of Environmental Quality or Department of Natural Resources (well water programs)
  • Your state real estate commission (disclosure form requirements)
  • A licensed real estate attorney in your state