The University of Arizona Water Resources Research Center’s Arizona Domestic Well Owner’s Toolkit was developed primarily for domestic well owners, but much of the information can also be useful for growers and agricultural operations that rely on groundwater. The guide provides a practical overview of how wells and aquifers function, how groundwater quality can vary, and how surrounding land uses may affect a well. 

The toolkit also includes helpful information on well construction, routine maintenance, water sampling, laboratory testing, common groundwater contaminants, and treatment options. Although the drinking-water recommendations are not agricultural water requirements, the resource can help us better understand systems, recognize potential problems, and communicate more effectively on well construction, treatment, and testing for water quality. 

Key Takeaways 

• Regularly inspect the well and surrounding area. Check the wellhead, casing, cap, seals, pump equipment, and drainage around the well for damage, standing water, or conditions that could allow contamination to enter.  

• Track changes in well performance over time. Keep records of pumping volume, water levels, energy use, repairs, and maintenance. Reduced yield, frequent pump cycling, sediment, or unusual air or noise in the system may indicate declining water levels or equipment problems.  

• Use site conditions to guide water testing. Consider nearby land uses, fertilizer or chemical storage, flooding, well repairs, seasonal changes, and the depth and location of the well when deciding whether additional testing may be needed.  

• Work closely with the laboratory before collecting samples. Confirm the correct containers, sampling location, holding times, and reporting limits to help ensure that results are fit for intended purpose 

• Do not rely on appearance alone to judge water quality. Some chemical and microbial contaminants may be present even when water looks, and smells, normal.  

• Match treatment to the specific purpose. Test the water first, identify the target and its concentration, and then select a treatment system designed for that issue. No single treatment technology addresses every water-quality concern.  

• Use the toolkit as a supporting resource. It can provide valuable background and troubleshooting information, but growers should continue to follow applicable agricultural water, food-safety, and regulatory requirements.