“It is better to have a regular maintenance of something than to pay for a new one.” I guess this saying aptly applies to well maintenance as well. Because mechanical well is also subject to wear and tear of its mechanical parts, and water is easily contaminated, it necessary to have water wells regularly maintained. In maintaining a well, there are several things one has to consider. First, make sure that you have a regular inspection of well equipment to ensure that it is within the sanitary standard and meets local code requirements.
Second, well maintenance includes regularly conducting a quality test of the well water for coliform bacteria, nitrates, iron, manganese, water hardness, sulfides, and other water constituents that may cause problems to your water well. Any major changes in water quality may be indicative of changes in your well or local groundwater. You can hire a water well contractor to check for you the water quality of your well. You may as well check with the local health department because they could provide you with a concise report on the quality of the groundwater in your area.
On your part, you have to keep hazardous chemicals (paint, fertilizer, pesticides, and motor oil, and other poisonous chemicals) away from your well; and always keep around your well a chemical free zone.
Lastly, keep the well records always in a safe place for future well maintenance reference.