Short answer: check visible conditions each spring and test on a certified-lab schedule
A useful annual well check has three separate parts: a homeowner's safe look at exposed equipment and drainage, a certified laboratory's water-quality tests, and professional inspection or service when a defect, change, or unresolved question is found. CDC advises private-well owners to check for mechanical problems each spring and test at least once a year for total coliform bacteria, nitrate, total dissolved solids, and pH; local health officials can recommend additional tests. That is not the same as a universal requirement for a licensed technician to perform a full annual teardown or pump test in every jurisdiction.
Schedule a qualified well professional when the casing, cap, surface seal, electrical components, pressure system, flow, or water changes raise concern, or when your records show the system has not had a documented assessment. Ask for a written scope tied to the well log and equipment rather than buying a generic inspection package. The goal is to catch observable maintenance and water-quality issues early, not to promise that a single visit can rule out every buried defect or contaminant.
Illustrative scenario: a spring walk-around reveals a change
Imagine a homeowner checks the well area each spring and notices that runoff now ponds near the casing after a new walkway was installed. The cap looks intact and the water tastes normal. This is an illustrative example, not a real property report. The owner takes dated photos, notes the recent grading work, and asks the local well program whether a certified sample or professional inspection is appropriate. A contractor reviews how the surface seal and drainage appear without opening the well; the lab sample and any added analytes are selected based on the local health department's advice.
The lesson is to compare the current condition with a documented baseline. A change in the surrounding grade, water appearance, household pressure, nearby land use, or treatment equipment may be more useful than a checklist that merely says ‘well okay.’ Record what was observed, which tests were actually performed, and which items were not accessible.
Make a safe visual check without opening the well
From a dry, stable location, look for a cap that is present and appears secure, exposed casing that is not visibly cracked or severely corroded, a surface seal without obvious settling or cracking, and ground that directs runoff away from the well. Notice new puddles, erosion channels, vehicle impact, construction, animal access, chemical or fuel storage, and changes to nearby septic or drainage features. Keep pesticides, fuel, fertilizer, waste, and machinery away from the wellhead. Photograph the area from the same direction and note the date so next year's comparison is meaningful.
Do not remove or loosen the cap, probe the casing, pour water into the well, disturb the seal, adjust electrical parts, or climb into a pit. The cap may include a screened vent and sealed wire entry that must remain sanitary; improvised plugging can create another problem. A contractor should investigate hidden construction, casing condition below grade, a suspected seal failure, or any work that requires lifting equipment. If the wellhead has been flooded or damaged, stay clear of wet electrical components and call the relevant professional rather than performing a casual inspection.
Keep water testing distinct from mechanical inspection
At least once per year, arrange testing at a state-certified laboratory for the baseline analytes recommended by CDC and your local program. CDC lists total coliform bacteria, nitrate, total dissolved solids, and pH as an annual minimum; it notes that additional germs or chemicals depend on location. Ask the health department about local geology, agriculture, fuel storage, septic systems, mining, road salt, nearby industry, and other relevant conditions. Use the laboratory's own containers and instructions because sample point, flushing, preservation, and delivery time vary by analyte.
Keep a result log with date, laboratory, analytes, units, sample tap, and whether the sample came before or after treatment. A raw-water sample and a treated-water sample answer different questions. A normal taste, odor, or appearance is not proof that bacteria or chemicals are absent, and a single negative result does not test for substances that were not included. Our guide on what to test private-well water for explains how to match the panel to local conditions instead of ordering by guesswork.
Test promptly after a well repair, flood, land disturbance, nearby spill, treatment change, a new household member when advised, or a noticeable change in taste, color, or odor. The responsible health agency can advise whether a specific incident calls for immediate stop-use, alternate water, disinfection, or repeat samples. Do not try to treat a lab result until the contaminant, concentration, and treatment objective are clear.
When to book professional inspection or service
Ask a qualified well contractor to assess a loose or damaged cap, cracked casing, deteriorated surface seal, new sediment, falling yield, loss of pressure, persistent pump cycling, a new leak, electrical noise or heat, or unexplained changes after nearby construction. A professional may compare the construction record with the visible installation, inspect accessible sanitary barriers, measure pressure and flow, assess pump performance or water-level recovery, and check the pressure tank and controls. Which tests make sense depends on the well type, equipment, symptoms, and local rules; not every visit requires the pump to be pulled or the well opened.
Before scheduling, give the provider the well log, last water results, repair invoices, treatment manuals, and a short timeline of the change. Ask what the visit includes, whether any measurements will be recorded, which components are excluded, what conditions require immediate repair, and whether follow-up water testing is recommended. Request photographs for concealed or inaccessible components. If electrical wiring or a breaker is involved, use a qualified electrician in coordination with the well contractor. If contaminant or health questions arise, involve the health department, laboratory, and a clinician rather than relying on the equipment seller alone.
A contractor cannot visually certify the water as safe, and a lab result does not verify that a pump or cap is mechanically sound. Keep the two work streams connected in your records but distinct in the conclusions. If repair occurs, record the parts and settings changed, collect the follow-up sample at the location and time directed by the lab, and store the final result with the service report.
Build a usable annual record and maintenance calendar
Keep one folder with the well construction report, driller information, pump and pressure-system details, treatment equipment manuals, laboratory reports, invoices, disinfection records, permits, and photographs. Add the date, provider, scope, observed condition, measurements, recommendations, and unresolved issues after every visit. Track filter and lamp replacements by the manufacturer's schedule, not a generic calendar copied from another property. If you have a shared well, also retain its operating agreement, access and maintenance plan, emergency contacts, and cost-sharing record; our shared-well owner guide covers those responsibilities.
Set a spring reminder for the visible check and the year's laboratory sampling. A second reminder can review treatment service, snow or flood damage, and changes in nearby land use. Do not create a fixed pump-service interval without the installer, manufacturer, or local authority; pump lifespan and maintenance depend on construction, water chemistry, operating pattern, and components. The records make it possible to compare trends and obtain more targeted professional advice.
Safety limits and jurisdiction caveats
This checklist is not a license to enter a well pit, open a sanitary cap, touch wet electrical equipment, pull a pump, or perform a repair. Keep people and animals away from an open or damaged well. Use a qualified contractor for construction, pump work, disinfection, electrical diagnosis, and below-grade inspection. If the water may be unsafe, follow health-department instructions for alternate supply and use; boiling does not remove all chemical contaminants.
Private-well licensing, annual inspection requirements, sampling analytes, certification programs, and repair permits vary. CDC and EPA guidance are national resources, not a replacement for the rules where the well sits. Ask the local health or environmental department which lab and analytes are accepted and confirm contractor credentials with the state well program. For purchase-specific evaluations, see our separate pre-purchase well inspection guide; this annual owner check is about maintaining an existing supply after closing.
Frequently asked questions
Does every well need a full professional inspection every year? Not universally; check local requirements and arrange professional evaluation when the system or records warrant it. How often should I test? CDC says at least annually for total coliform, nitrate, TDS, and pH, with local additions. Can I open the cap to inspect inside? No, leave sanitary and electrical components intact for a qualified professional. Does a test report replace a mechanical inspection? No. Does an inspection prove the water is safe? No; use a certified laboratory. What if the water looks and tastes normal? Keep the annual testing plan because many hazards have no sensory warning.