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Well Maintenance Schedule: What to Do and When

A private well has no utility company checking it for you. Here's what to inspect, test, and record, and roughly how often, based on guidance from the EPA, CDC, and the National Ground Water Association.

Why a Schedule Helps

Public water systems are tested on a regulated schedule under the Safe Drinking Water Act, but that law doesn't apply to private household wells. The EPA puts the responsibility for testing and upkeep squarely on the well owner. The National Ground Water Association's homeowner guidance echoes this, noting that a properly constructed private water system needs relatively little routine maintenance, but what it does need falls into a predictable yearly rhythm rather than something you set and forget. The schedule below pulls together EPA, CDC, and NGWA guidance, organized by how often each task should happen.

The Schedule at a Glance

Most of what a well owner needs to do happens once a year, with a shorter list of checks worth doing more often and a separate set of triggers that call for action right away, regardless of when the last check happened.

Treat this as a floor, not a ceiling. Older wells, wells with a history of problems, or households with infants, pregnant or nursing family members, or elderly residents may warrant checking some of these items more often, per EPA and CDC guidance.

Annual Water Testing

Both the EPA and CDC recommend testing private well water at least once a year for four core parameters: total coliform bacteria, nitrates, total dissolved solids, and pH. These four aren't a random sample; each flags a different kind of problem. Coliform bacteria signal that surface water, septic effluent, or animal waste may be finding a way into the well. Nitrates typically point to fertilizer, septic, or agricultural runoff reaching groundwater. Total dissolved solids is a rough gauge of everything dissolved in the water, minerals, salts, and metals combined. pH affects both taste and how corrosive the water is toward pipes and fixtures.

Use a state-certified laboratory for this testing rather than a generic retail kit alone; the EPA and CDC both point to county health departments as a resource, since some offer private well testing for free or at reduced cost. For a longer breakdown of what to test for and when to add tests like arsenic or radon based on local geology, see our well water testing guide.

Inspecting the Well Cap, Casing, and Wellhead

Between annual professional visits, the EPA recommends periodically inspecting the exposed parts of the well yourself, looking for a cracked, corroded, or damaged well casing, a broken or missing well cap, and settling or cracking of the surface seal around the wellhead. NGWA's homeowner checklist adds a few concrete details: the well cap or cover should be securely attached and in good repair, the top of the casing should sit at least one foot above ground level, and the ground around the wellhead should slope away from it so runoff drains away rather than pooling at the casing.

The same NGWA guidance also flags everyday habits that protect the wellhead: keep hazardous chemicals such as paint, fertilizer, pesticides, and motor oil well away from the well, be careful mowing close to the casing so you don't damage it, and don't pile snow, leaves, or other materials around the wellhead, since that can trap moisture and hide developing problems. A cracked cap or damaged seal is exactly the kind of thing that lets insects, rodents, or surface water into the well, so this is a low-cost check with an outsized payoff.

Pump and Pressure Tank Checks

NGWA's routine maintenance guidance recommends having a licensed or certified water well systems professional evaluate the well at least annually. A full checkup typically includes a flow test to measure system output, a check of the water level before and during pumping, an evaluation of the pump motor's amp load, grounding, and line voltage, and verification of the pressure tank and pressure switch contacts. Some of this you can check yourself between professional visits: NGWA's guidance describes inspecting above-ground pumping equipment to confirm motors are properly cooled and vented, and watching for shaft seal leaks or rust and other signs of weakened fittings. Beyond that basic visual check, NGWA is explicit that "any maintenance other than cleaning should be left to a water well systems professional."

For pressure tanks specifically, NGWA's guidance calls for noting the tank's condition and accessibility and flagging any concerns about pressure, buried tanks, or unusual cycle times (the pump switching on and off more often than normal) to a professional rather than troubleshooting it yourself. Short-cycling is often an early sign of a failing tank bladder or a pump problem, and catching it during a routine check beats waiting for a full pump failure.

Keeping a Well Log and Maintenance Records

Both the EPA and NGWA single out record-keeping as part of routine maintenance, not an afterthought. The EPA recommends keeping accurate records of well maintenance, including disinfection or sediment removal work that involves chemicals in the well. NGWA's guidance goes further, describing the well log, the detailed record of the well's original construction, often filed with the state, along with the pump installation record, as two of the most useful tools for troubleshooting problems later. If you don't already have copies, NGWA suggests asking your well contractor for them directly, or requesting them from the state agency where well logs are filed, which in many states can now be done online. Store these alongside your annual water test results and any professional checkup reports in one place, so a future contractor (or a future you) isn't starting from zero when something goes wrong.

When to Test or Inspect Outside the Normal Schedule

The annual rhythm above assumes nothing unusual has happened. EPA and CDC guidance both call for testing right away, regardless of when the last annual test was, if any of the following apply:

• There's a known groundwater or drinking water problem in your area.
• Conditions near the well have changed significantly, including flooding, land disturbance, or new construction or industrial activity nearby.
• You've just replaced or repaired any part of the well system.
• Your water's taste, odor, or appearance changes.

NGWA's guidance adds a few more situations worth an off-cycle test: a broken well cap, inundation by floodwaters, a new contamination source nearby, a well with a history of bacterial contamination, a septic system that has recently malfunctioned, recurrent gastrointestinal illness among people in the household, or an infant living in the home. Both the EPA and CDC also note that households with small children, elderly adults, or someone who is pregnant or nursing may want to test more often than once a year as a general precaution, since these groups are more vulnerable to contaminants that might otherwise go unnoticed between annual tests.

Putting It Together

A short annual routine, one water test, one professional checkup, a walk around the wellhead, and an updated file of records, covers most of what EPA, CDC, and NGWA guidance recommends for a well that's behaving normally. The exceptions are the off-cycle triggers above: floods, repairs, nearby construction, or a change in how the water looks, smells, or tastes. Those call for action immediately, not a wait for next year's checkup. If a routine inspection turns up a cracked casing, a failing pressure tank, or anything beyond a simple fix, that's the point to bring in a licensed well professional. See our guide to hiring a licensed well driller for what to check before you hire one, or our cost guide for what repairs typically run.

Sourced from the EPA's Protect Your Home's Water guidance, the CDC's Guidelines for Testing Well Water, and the National Ground Water Association's homeowner resources at Wellowner.org, including its Annual Water Well Inspection page, Well Owner Routine Maintenance Practices page, and Homeowner's Maintenance Checklist. Maintenance needs vary by well age, construction, and local conditions; a licensed well professional can tell you what applies to your specific well.