In most subdivisions in Gallatin County, well and septic drainfield locations on individual lots were designated as a condition of final subdivision plat approval. Before you build or drill, you should review the final subdivision plat on file at the Gallatin County Courthouse to determine the recommended well site. You also need to find out if minimum well depth requirements apply where neighboring septic drainfields are located. Avoid placing your well downhill or within 100 feet from a livestock pen or barnyard, fuel tank or storage area for hazardous chemicals. If you plan to board large livestock or numerous smaller livestock on your property, locate the barn and corral at least 100 feet away from your well.
Shallow wells are more likely to be affected by contaminants than deeper wells.
Generally, the deeper the well is, the less susceptible it will be to contamination if properly constructed and maintained. Wells must also be located a minimum of 100 feet from surface water bodies. It is also recommended that this 100 foot setback be applied near irrigation canals. Remember, the greater the distance you can put between your well and potential contamination the better. The Gallatin Local Water Quality District, DNRC, local well drillers or groundwater professionals can assist you with selecting an appropriate well site.