{"id":1256,"date":"2026-09-04T12:27:00","date_gmt":"2026-09-04T04:27:00","guid":{"rendered":"https:\/\/borrapumps.com\/blog\/how-to-tell-if-a-well-pump-is-bad\/"},"modified":"2026-09-06T01:00:04","modified_gmt":"2026-09-05T17:00:04","slug":"how-to-tell-if-a-well-pump-is-bad","status":"publish","type":"post","link":"https:\/\/borrapumps.com\/ru\/blog\/how-to-tell-if-a-well-pump-is-bad\/","title":{"rendered":"How to Tell If a Well Pump Is Bad: A Safe Diagnostic Guide"},"content":{"rendered":"

To tell whether a well pump is bad, do not rely on one symptom. Verify power and controls, pressure-tank behavior, leaks and valves, static and pumping water levels, flow and pressure, voltage and current, and the pump's curve before blaming the pump. Low pressure, no water, air, sediment, rapid cycling, continuous running, trips, or noise can also result from a dry well, failed tank, switch or control box, leaking pipe, blocked intake, or check-valve problem. Protect the system and test in a safe order.<\/p>\n

This article is a practical diagnostic and procurement guide, not a substitute for the pump manufacturer's instructions, an approved system design, current electrical and plumbing rules, or qualified site service. Isolate energy and pressure before opening equipment. Well work, lifting, confined spaces, wastewater, wet electrical locations, and energized testing require competent personnel and task-specific controls.<\/p>\n

Contents<\/strong><\/p>\n
    \n
  1. Start with the exact symptom and timing<\/a><\/li>\n
  2. Check the pressure tank and controls<\/a><\/li>\n
  3. Separate a water-source problem from a pump problem<\/a><\/li>\n
  4. Test hydraulic performance<\/a><\/li>\n
  5. Test electrical condition safely<\/a><\/li>\n
  6. Define the repair or replacement decision<\/a><\/li>\n
  7. Decision table<\/a><\/li>\n
  8. Frequently asked questions<\/a><\/li>\n<\/ol>\n<\/div>\n

    Start with the exact symptom and timing<\/h2>\n

    Record whether water stopped suddenly or declined gradually, whether every outlet is affected, and whether the problem follows heavy use, drought, freezing, electrical work, or a recent repair. Note pressure-gauge behavior, controller lights or alarms, breaker status, sound, runtime, cycling, air, sediment, discoloration, and leaks. A sudden total loss after a storm suggests a different path from months of falling capacity. Do not repeatedly reset a breaker or run a pump that may be dry. Preserve the state long enough for useful measurements.<\/p>\n

    Check the pressure tank and controls<\/h2>\n
    \"how
    how to tell if well pump is bad \u2014 check the pressure tank and controls. BORRAPUMP media library; illustrative context, not a performance claim.<\/figcaption><\/figure>\n

    A failed or incorrectly charged pressure tank can make the pump start every time a small amount of water is used. A blocked sensing port, damaged pressure switch, incompatible settings, loose connection, failed control-box component, or faulty level protection can prevent correct starting and stopping. Qualified personnel should isolate power before inspecting contacts or wiring and use the manufacturer's procedure for electrical tests. Confirm actual cut-in and cut-out pressure, tank drawdown, and starts. Correcting the control chain may restore service without pulling the pump.<\/p>\n

    Separate a water-source problem from a pump problem<\/h2>\n

    Measure static water level after recovery and pumping water level at a known flow where the installation allows. A falling level, poor recovery, or pumping beyond sustainable yield can cause air, loss of water, overheating, and protective trips even when the pump is mechanically sound. Sand may indicate well development, screen, formation, or excessive withdrawal issues as well as pump wear. Compare with the well record and seasonal history. Storage or a lower pumping rate may be needed; simply installing a larger pump can worsen drawdown.<\/p>\n

    Decision table<\/h2>\n
    \n\n\n\n\n\n\n\n\n
    Symptom<\/th>\nOther possible cause<\/th>\nEvidence to collect<\/th>\n<\/tr>\n<\/thead>\n
    Rapid cycling<\/td>\nPressure tank, leak or control differential<\/td>\nCut-in\/out, drawdown and starts<\/td>\n<\/tr>\n
    Runs continuously<\/td>\nLeak, low well level or inadequate capacity<\/td>\nFlow, pressure and pumping level<\/td>\n<\/tr>\n
    Trips protection<\/td>\nVoltage, cable, control or mechanical overload<\/td>\nVoltage, current and fault record<\/td>\n<\/tr>\n
    Air or sediment<\/td>\nDrawdown, well or pipe issue<\/td>\nWater levels, flow and water condition<\/td>\n<\/tr>\n<\/tbody>\n<\/table>\n<\/div>\n

    Test hydraulic performance<\/h2>\n
    \"how
    how to tell if well pump is bad \u2014 test hydraulic performance. BORRAPUMP media library; illustrative context, not a performance claim.<\/figcaption><\/figure>\n

    Establish a stable valve condition and measure flow and discharge pressure while noting water level and pipe elevations. Calculate the approximate total dynamic head and compare the duty with the correct curve. Low flow can come from a worn pump, clogged intake, damaged impellers, leaking rising main, partly closed valve, obstructed filter, low water level, or incorrect rotation in applicable motors. A pump that meets its curve is unlikely to be the main hydraulic fault. A curve comparison is more reliable than judging pressure at one fixture.<\/p>\n

    Test electrical condition safely<\/h2>\n

    Qualified testing can record supply voltage, voltage while starting and running, current, imbalance on three-phase systems, insulation resistance under the approved isolated procedure, continuity, and protection events. High current may accompany mechanical drag, overload, wrong voltage, sand, or an unsuitable operating point. Low current may indicate dry running, loss of load, or an open circuit. A normal surface reading does not rule out damaged down-well cable. Do not use improvised live probes or bypass overload and dry-run protection.<\/p>\n

    Define the repair or replacement decision<\/h2>\n
    \"how
    how to tell if well pump is bad \u2014 define the repair or replacement decision. BORRAPUMP media library; illustrative context, not a performance claim.<\/figcaption><\/figure>\n

    If evidence points to an accessible switch, tank, controller, valve, or pipe, repair and retest that item first. If the pump or motor fails hydraulic, winding, insulation, bearing, or repeated reliability checks, plan a controlled pull and inspection. Confirm pump setting, lifting method, sanitary handling, replacement duty, pipe and cable condition, check valves, and commissioning tests. Do not automatically match the failed horsepower; recheck water level, demand, head, power, and controls so the replacement corrects the actual cause.<\/p>\n

    System selection, evidence, and procurement record<\/h2>\n

    A well-pump decision should begin with the well record rather than the nameplate on the failed unit. Record drilled depth, casing diameter, static water level, pumping water level at a stated test flow, recovery, water quality, pump setting, rising-main size, pressure setting, storage volume, supply voltage, and the present control sequence. The pumping level\u2014not the bottom of the well\u2014is the starting point for the lift calculation. Add discharge pressure and pipe losses to establish total dynamic head, then compare the expected operating range with a current certified curve. The sustainable yield of the well can be lower than the short-term demand of the building. Storage and controls may therefore be more important than selecting a larger pump.<\/p>\n

    Treat electrical and hydraulic evidence as one record. Pressure, flow, water level, voltage, running current, starting behavior, insulation condition, runtime, starts, and controller events help separate a pump fault from a dry or declining well, leaking pipe, failed check valve, waterlogged pressure tank, obstructed line, low voltage, or incorrect control setting. Measurements must be made with suitable instruments by people qualified for the work. Never open energized equipment, pull a submersible pump, or enter a well enclosure without the required isolation, lifting plan, sanitation controls, and site procedure.<\/p>\n

    For procurement, ask every supplier to quote the same boundary: pump and motor, cable, splice, rising main, check valves, wellhead fittings, pressure tank, sensors, controller, protection, installation, lifting, testing, documentation, commissioning, and disposal of removed equipment. Compare the complete installed scope rather than the pump price alone. Require dimensional data, materials, curve, absorbed power, motor data, minimum submergence, cooling requirements, permitted starts, controls, installation instructions, test records, spares, and warranty conditions. At commissioning, preserve baseline readings so future diagnosis can distinguish normal aging from a changed well or system.<\/p>\n

    How this topic connects to BORRAPUMP equipment<\/h2>\n

    This guide supports early review of how to tell if well pump is bad<\/a> applications. It does not assign a final model. Send the liquid, flow range, total head, source and destination levels, solids, duty cycle, power, controls, site conditions, quantity, destination, and required approvals so equipment can be checked against the real service.<\/p>\n

    Related BORRAPUMP engineering guides<\/h2>\n
      \n
    • well pump lifespan<\/a><\/li>\n
    • well pump control box<\/a><\/li>\n
    • water transfer pump troubleshooting<\/a><\/li>\n<\/ul>\n

      Authoritative sources and further learning<\/h2>\n

      U.S. EPA private drinking water wells<\/a>; USGS groundwater levels<\/a>; OSHA electrical safety<\/a>. These sources provide general engineering, water, environmental, or safety context; current local rules, approved designs, and equipment instructions remain controlling.<\/p>\n