By the fall of 1994, the Statewide Program network included over 1,500 monitoring sites. In addition to funding from IDWR and the USGS, the ISDA contributed funding to the Statewide Program for pesticide analyses from 1993 through 1999. Every year, about 400 monitoring sites are sampled. Most sites have been sampled once every four years. Beginning in 2001, IDWR plans to add more sites to the network which will cause the sampling frequency to be modified to once every five years.
Annual sites serve two main purposes.
Second, the collection frequency at Annual Sites may be useful for determining whether concentration changes are associated with long-term trends or are being affected by unique events or conditions such as precipitation extremes or patterns. Over 1,500 wells and springs have been sampled through the Statewide Program. Sally the dog appears pleased that her owner's well is part of the Statewide Program. Results Ground-water quality in Idaho was found to be safe for human consumption and other beneficial uses at most of the Statewide Program sites. Southern Idaho had a higher percentage of these sites than did central and northern Idaho.