The difference between a borehole that lasts 30 years and one that fails in 10 often comes down to a single factor: whether it was on a routine maintenance schedule. Routine maintenance is the systematic, calendar-driven inspection and servicing of a borehole and its associated equipment, carried out at defined intervals regardless of whether a problem is apparent. It is preventive care, not reactive repair.
The Logic of Scheduled Maintenance
Reactive maintenance — fixing things when they break — is consistently more expensive than preventive maintenance. Emergency call-outs, expedited parts procurement, disruption to water supply, and the compounding damage that a failed component can cause to adjacent equipment all inflate the true cost of neglect. A well-designed maintenance schedule addresses the failure modes of each system component before they manifest.
The schedule must be realistic, documented, and assigned to specific responsible individuals. A maintenance plan that exists on paper but is never followed is no maintenance plan at all.
Weekly Tasks
Weekly checks are visual and observational, requiring no specialist skills. They should be carried out by the site operator or caretaker:
- Wellhead inspection: Check that the wellhead cap or cover is secure and undamaged. Look for signs of rodent activity, vandalism, or unauthorised access.
- Surface drainage: Confirm that the concrete apron is intact and that surface water is draining away from the wellhead. Ponding near the wellhead is a contamination risk.
- Pump operation: Confirm the pump is running normally — no unusual noise, vibration, or smell from the motor or control panel.
- Flow rate check: Note the discharge flow and compare to the expected rate. Any noticeable reduction should be logged.
- Electrical panel: Check indicator lights and circuit breakers. Log any fault alarms.
Monthly Tasks
Monthly maintenance involves slightly more detailed checks and simple measurements:
- Water level measurement: Measure the rest water level before the pump starts and the pumping level after a defined period of operation. Log both and compare to previous months.
- Amperage reading: Use a clamp meter to measure motor current draw. Rising amperage at the same output suggests increasing wear or changing pump efficiency.
- Discharge pipework: Inspect all visible pipework, fittings, and valves for leaks. Check the condition of the non-return valve if accessible.
- Chemical dosing equipment (where installed): Check dosing pump operation, chemical levels, and tubing condition.
- Log review: Review the week-by-week observations and note any trends or concerns for the quarterly check.
Quarterly Tasks
Quarterly checks introduce water quality sampling and more systematic performance assessment:
- Bacteriological water quality sample: Collect a sample in a sterile container and submit to an accredited laboratory. Results should be reviewed against drinking water standards.
- Physical water quality: Measure turbidity, colour, and odour on-site. Turbid or discoloured water should trigger a more detailed investigation.
- Pump performance test: Measure flow rate against drawdown and compare to the pump curve. Document any deviation from expected performance.
- Storage tank inspection (where present): Check tank integrity, inlet, outlet, and overflow; inspect and clean if necessary.
- Fence and site security: Inspect the site perimeter, access gate, and any warning signage.
Annual Tasks
Annual maintenance is a more thorough assessment that requires a qualified technician:
- Comprehensive water quality analysis: Full chemical suite including pH, electrical conductivity, hardness, major ions, nitrate, iron, manganese, and any site-specific contaminants of concern.
- Pump pull and inspection: Remove the submersible pump, rising main, and cable. Inspect the pump impellers, bearings, and motor casing. Check the cable for chafing or damage. Replace worn components.
- Borehole water level logger download: If a continuous logger is installed, download and review the full year of data. Identify trends, anomalies, and seasonal patterns.
- Chlorination: Following pump reinstallation, disinfect the borehole as standard procedure.
- Maintenance plan review: Review the schedule, update it based on observations from the year, and set the budget for the following year.
Five-Year Tasks
Every three to five years, the borehole itself — rather than just the equipment — should be inspected:
- CCTV downhole survey: A downhole camera survey inspects the condition of the casing, screen, and gravel pack. It identifies corrosion, joint displacement, screen blockage, or collapse that would not be apparent from surface observations.
- Redevelopment: Based on the CCTV findings and performance data, targeted redevelopment using surging, jetting, or air lifting may be appropriate to restore hydraulic efficiency.
- Full rehabilitation assessment: A hydrogeologist or well engineer should review all historical data and the CCTV footage to produce a structured condition report and rehabilitation recommendation.
Assigning Responsibility
Every task on the schedule must have a named responsible party, a target completion date, and a sign-off mechanism. For community or institutional boreholes, a formal operations and maintenance (O&M) committee with a dedicated budget significantly improves compliance with the schedule. Where specialist tasks exceed local capacity, a service contract with a qualified borehole maintenance company provides continuity and accountability.
