Which of the following are signs of an improperly sealed well?

The presence of fluctuations in water levels, nearby contamination issues, or visible surface water intrusion indicates that a well may not be properly sealed. An improperly sealed well can allow surface water or contaminants from the surrounding environment to enter the well, leading to fluctuations in the water table due to changing weather conditions or water usage.

Additionally, if there are nearby contamination issues, such as agricultural runoff or sewage leaks, it can further signal that the well casing may be inadequate in preventing those contaminants from impacting the water quality. Furthermore, visible signs of surface water intrusion could indicate that the well is vulnerable to outside influences and not functioning as intended to maintain a clean and stable water supply.

Consistent water levels typically suggest a stable aquifer or well, while high water pressure might indicate other issues that do not directly relate to the sealing of the well. Clear water quality alone does not confirm the integrity of the well sealing, as the water can appear pure yet still be at risk of contamination if the well is not adequately constructed or maintained. Thus, the signs listed in the correct answer are critical indicators of potential problems with the sealing of the well.