Abandoned Wells in South Dakota
Property Owner Responsibilities. The owner of property on which an abandoned well is located is deemed to be the owner of the abandoned well. Consequently, the owner is also responsible for plugging the abandoned well or wells as required by South Dakota Codified Law (SDCL) 46-6-18 and 46-6-27. There are many reasons for the owner to properly plug an abandoned well, aside from the legal requirement to complete the plugging. These wells also pose environmental and safety hazards resulting in potential legal liabilities. A list of abandoned well hazards is as follows:
- Contamination of aquifers by allowing surface runoff carrying pollutants to enter the ground water;
- Cross contamination of aquifers by the well passing through more than one aquifer;
- Reducing artesian head pressure which may affect other wells in the same aquifer;
- Safety hazards to people and animals.
The plugging of an abandoned well needs to meet requirements outlined in the SD Well Construction Standards sections 74:02:04:67 and 74:02:04:69. These rules specify how to plug a well depending on the type of well construction, the type of aquifer or aquifers which the well penetrates, and the materials to be used to plug the well. Even though the owner of an abandoned well may plug the well, it is strongly suggested that a SD licensed well driller perform the work due to the varying conditions encountered in plugging an abandoned well. If a well is not plugged properly, ground water contamination may still occur and it is very difficult and expensive to correct the improper plugging of an abandoned well.
Historical Background. Abandoned wells exist throughout South Dakota and tap into every principle aquifer in the state. These are the same aquifers that are relied on today for much of the drinking water used in the state. While the actual number of abandoned wells is not known, it is possible to make some reasonable estimates of the number of abandoned wells. In 1910, South Dakota had approximately 78,000 farms which reached a maximum of 84,300 farms in 1932. Since that time, farm numbers have declined steadily to about 31,700 today. Therefore, South Dakota has lost approximately 52,600 farms that likely had at least one well which may now be abandoned. Aside from the reduction in the number of farmsteads, other factors have also contributed to the creation of abandoned wells such as the development of rural water systems and rural electrification. Abandoned wells are not only a problem on farmsteads. Municipalities have also hooked up to rural water systems or constructed replacement wells and have not properly plugged their old wells which gradually fall into disrepair. Many people have good intentions to maintain an old well as a backup or standby well, but typically these wells never get used again and are forgotten over time. When this occurs, the well becomes a potential pollution source to everyone using the aquifer and a potential liability to the well owner. Whoever owns the property on which the abandoned well is located is deemed to be the well owner.
Locating Abandoned Wells. Abandoned wells may be located anywhere but there are some obvious indicators of the presence of abandoned wells such as windmills, hand pumps, abandoned farmsteads, or a simple pipe sticking out of the ground. Wells were often drilled near outbuilding and were housed in small sheds or sometimes wells were located in the basement of a home. Perhaps not so obvious are the inhabited farmsteads that are now served by rural water or farms that have had newer wells drilled to replace the original well which has since been abandoned. The same can be said of cities and towns in South Dakota that have hooked to rural water or drilled replacement wells. Other indicators of the presence of an abandoned well are depressions supporting aquatic vegetation, such as cattails, in an otherwise dry area. Often, wells were hand dug and are large diameter wells constructed of concrete, wood, bricks, rock, or other materials around the perimeter of the well. In some instances, the abandoned well is housed within a large diameter pit which may be several feet deep.
Other information sources for locating abandoned wells include:
- Previous landowners or long-time neighborhood residents;
- Well drillers and well completion reports filed with Water Rights Program (605 773-3352);
- In the case of irrigation wells or other large water use wells, a water right permit on file with the Water Rights Program;
- Old photos of the property showing building locations;
- County or city building permits;
- Old fire insurance plan drawings may show the location of wells
Environmental and Safety Hazards
Contamination of Aquifers. Unsealed or abandoned wells directly connect the land surface with ground water. Due to this, polluted surface water can easily enter the ground water and cause a contamination problem. Examples of pollutants that can enter the ground water are human or animal wastes, petroleum products, fertilizers, pesticides, etc. Once an aquifer has become contaminated it can be very expensive and difficult to undo the damage. Some of the health hazards associated with contaminated ground water are "blue baby syndrome" caused by high nitrate levels and waterborne diseases such as hepatitis, cholera, and diarrhea caused by bacteria entering the ground water.
Cross Contamination of Aquifers. A well which penetrates more than one aquifer may allow water from one aquifer to contaminate another aquifer if the well is not properly constructed. Water may leak along the outside of the well casing if the well is not properly sealed or the casing may deteriorate and develop holes which allows water movement inside the casing. In either event, the water from one aquifer mixes with one or more other aquifers which may cause problems. Water of poorer quality may enter another aquifer and reduce the water quality as well as pollutants moving from a contaminated aquifer to an aquifer which, unfortunately, is about to become contaminated.
Reducing Artesian Head Pressure. Abandoned wells from which water flows over the land surface or that leak water underground from one aquifer to another aquifer will reduce the head pressure in an aquifer. As a result, water levels in nearby wells will be lowered and wells that once flowed may need to be pumped to get water from the well. It may not even be possible to place a pump in a well that no longer flows due to the size of the well casing. In addition, water flowing from an abandoned well may result in a waste of water which is prohibited by state law in SDCL 46-1-4.
Safety Hazards. Many abandoned wells are not marked or covered. In some instances the well casing or a pit in which the well is located is large enough for a person or animal to fall into and become seriously injured or killed. While such occurrences are rare, they do happen. Fortunately, these types of accidents are entirely preventable with proper plugging of the well.
If you have questions or need more information, please contact the Water Rights Program at 605 773-3352 or email us or view a report (Adobe Acrobat PDF file) entitled "Abandoned Well Sealing Demonstration Project." Thank you for helping to protect South Dakota's water resources.