Before drilling a water well, it is necessary to have information about the geologic and topographic maps of the location, availability of aquifers and groundwater quality or possibility of contamination. These factors help to determine the viability and cost of the project, as stated on the United States Geological Survey (USGS) website.
A preliminary assessment of wells or water sources in the area and having a good understanding of where groundwater occurs is a reliable method of determining if appreciable volume of water is available on the water table. Groundwater specialists do this assessment. The project should also have the necessary permits from the relevant authorities before it is started.
It is difficult to provide the exact quote or estimate of the cost of drilling a water well. The final cost of the well and pump installation will depend on the following factors:
- Permits required by authorities
- Assessment by groundwater specialists
- Drilling per foot by diameter of casing and liner
- Water obtained to satisfy requirements
- Number of grouting annular seals used
- The price of pumping equipment
Once the well has been drilled, yield testing should be done by the contractor. An extensive pump test is also recommended to determine the draw down and recovery rate of the water in the well. Generally, five gallons per minute for two hours is considered the minimum acceptable yield in any 24-hour period.