Short answer: start with records and have a licensed professional confirm the actual wellhead
To find an existing private well on your own property, begin with the state or local well-record search, permit drawings, older surveys, pumping invoices, and the property's water-system map. Then ask the owner or knowledgeable service provider where the active wellhead is and compare those records with visible casing, a sanitary cap, a pump house, pressure equipment, or a known buried service line. If the location is unclear, arrange a qualified well professional to survey the site and confirm the well safely. Do not remove a cap, lower a person into a pit, drive a probe, or start excavating on a guess.
Several wells may exist: a current drinking-water well, an irrigation or livestock well, a replacement well, and one or more unused wells. Not every well is connected to the house, and an old casing can be hidden by landscaping or a structure. A missing record does not establish that no well exists. The objective is a documented map that distinguishes verified, suspected, and unresolved locations so future construction, sampling, maintenance, and closure do not damage a water source or expose someone to a fall hazard.
Illustrative scenario: the pressure tank is indoors, but nobody knows where the casing is
Imagine a homeowner inherits a rural property file with pump invoices but no site plan. Water works normally and the pressure tank is in a basement utility room. A small capped pipe stands behind an old shed, but the owner does not know whether it is a well, irrigation riser, or abandoned casing. This is an illustrative example, not a real location report. The owner photographs it from the ground, asks the state well program for construction records, checks prior service bills, and hires a licensed well professional to verify the active well and search for additional features.
The professional compares the physical equipment with records, identifies a safely accessible casing and pump system, and explains that the smaller pipe is an unused well candidate requiring further confirmation. The homeowner creates a sketch with permanent landmarks and dates each observation. No soil is opened and no cap is disturbed until the provider and local authority establish the correct identification and any required closure procedure. If the well is later confirmed as unused, its proper filling and sealing are handled under state rules by the qualified person required there.
Search paperwork using more than one identifier
Contact the state well program, county health department, conservation office, or permitting authority that handles private wells in the property's jurisdiction. Search by street address, parcel number, subdivision or lot, former owner, well permit, driller, and approximate construction year; rural addresses may be missing or indexed differently. Ask whether paper archives, scanned permits, alteration reports, pump work, and abandonment records are stored separately. The original well driller or a later pump contractor may have retained a sketch or service notes even when a public database does not show a location.
Treat every record as evidence to check rather than an exact GPS pin. Compare casing depth and diameter, drill date, contractor, use, parcel description, and any mapped coordinates with the actual site. One parcel can contain multiple reports; a record may also belong to a nearby property. Keep copies of source pages and note whether each identification is confirmed by an agency, provider, or owner recollection. Wisconsin DNR, for example, points owners to construction reports and recommends a licensed professional when a report is missing; local agency procedures elsewhere differ.
Read surface clues without disturbing the well
Walk the parcel in daylight with permission and avoid unstable ground. Look from a safe distance for a capped casing, a concrete or masonry cover, a well house, a pump electrical disconnect, a pressure line entering a building, or a known water service route. Also note possible wells near older barns, cabins, irrigation, livestock troughs, or former homes. Those clues can identify places for records research, but a pipe, valve, or small foundation by itself does not prove there is a well beneath it.
Check basements, crawlspaces, garages, sheds, and utility rooms for pipes or old pumps, but do not cut a wall or open a sealed floor. Do not lift heavy covers, remove sanitary seals, insert rods, lower a camera, apply magnets, or use a metal detector as if it confirmed a potable well. An open or poorly covered shaft can collapse or cause a fatal fall. Do not enter a well pit or confined space. If you find a damaged cover, exposed wire, loose casing, surface water entering, or a suspected abandoned shaft, keep people and animals away and call the appropriate professional.
Use a locator or qualified contractor when records are unclear
A licensed well driller or pump installer can compare records to visible equipment, safely assess the wellhead, and advise whether additional locating methods are appropriate. For a concealed or disputed site, a private utility locator, surveyor, or geophysical service may contribute evidence, but their marks do not independently establish construction, use, sanitary condition, or regulatory status. Ask the provider to explain the method, uncertainty, and what would count as confirmation before anyone excavates.
Before digging, use the jurisdiction's one-call utility-location service and arrange separate private-line locating where public locates do not include customer-owned water, electric, irrigation, or abandoned services. Marks are approximate and may not show an old private well's boundaries or connected piping. Keep heavy machinery away from the suspected footprint. A locator's report should show date, method, visible landmarks, confidence, and whether the well was actually inspected or merely inferred.
Create a durable well map and handle unused wells correctly
Once identified, make a simple map from permanent points such as the foundation, driveway edge, or survey monument and record the wellhead, pressure tank, treatment units, power disconnect, sample tap, and buried line route if verified. Label approximate measurements as estimates. Attach the construction report, inspection, test results, photos, and contact information for the drilling and pump service companies. Update it after repairs, construction, flood response, a new well, or closure so a future contractor is not forced to rely on memory.
If a well is not in use, ask the state or county well authority what classification, reporting, and closure rules apply. Do not pour rubble, soil, or chemicals down it, cut the casing below grade, or cover it to make the yard look finished. EPA advises using a certified well driller for modification, abandonment, and closure; specific licensing and procedures vary by jurisdiction. Our unused-well closure guide explains the records and safety steps to discuss with the regulator and contractor.
Frequently asked questions
Can an online well log tell me exactly where the casing is? Sometimes it helps, but map precision and older records vary; have the physical location verified. Can I dig where the well probably is? Not until utilities and the well are safely located by appropriate professionals. Does a working house pump prove there is only one well? No. Could a capped pipe be something else? Yes; do not identify it by appearance alone. What if no well record appears? Search archives and ask the well program or a licensed professional; absence of an online record is not proof of absence. What should the final map include? Confirmed wellheads, evidence source, dates, equipment, sample point, buried lines only if located, and unresolved candidates.