Quick Answer
The lifespan of a well depends on various factors, such as water yield, yield decline rate, and maintenance. On average, a well can last anywhere from 10 to 50 years or more, with some wells lasting a lifetime if properly maintained.
Factors Affecting Well Lifespan
The lifespan of a well is influenced by several factors, including the type of aquifer, rock formation, and water yield. A well drilled into a stable aquifer with a high yield can last longer than one drilled into a fragile aquifer with a low yield. In general, a well with a high yield (over 100 gallons per minute) can last longer than one with a low yield (less than 20 gallons per minute).
Maintenance and Well Lifespan
Regular maintenance is crucial to extending the lifespan of a well. This includes inspecting the well casing and screen for damage or corrosion, checking the well cap for proper sealing, and monitoring water quality. A well that is not properly maintained can lead to decreased water yield, contamination, and even collapse. It’s recommended to inspect the well at least twice a year and have it serviced by a professional every 5-10 years.
Well Yield Decline Rate
The yield decline rate is a critical factor in determining well lifespan. A well with a high decline rate (more than 10% per year) may need to be re-drilled or re-screened within a decade, while a well with a low decline rate (less than 2% per year) can last longer. Understanding the yield decline rate can help predict when a well may need maintenance or replacement.
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