The Department of Environmental Quality is extending a well-water testing program to residents in southern areas of Deschutes County.

The program is available this spring to the owners of 40 wells. Sixty wells were tested in the area last year under the program.

During the program, well water is analyzed for chemicals that pose a potential health risk, including nitrates, arsenic, pesticides and herbicides, among others. The results will be provided free to landowners.

Sample results will be publicly available, but landowner information will not be included in the public database. Well users will receive testing results after the report is published.

Southern Deschutes County is targeted because the area has porous, volcanic soil and many shallow groundwater aquifers, both of which have the potential for contamination. Groundwater data in the area shows elevated nitrate levels in some water samples.

Sources of groundwater contamination can include failing septic systems, application of fertilizer or pesticides and leaking underground fuel tanks.

The Department of Environmental Quality recommends that well owners test their water regularly to protect their health. Testing for E. coli bacteria and nitrate testing is recommended annually. Arsenic testing is recommended every three to five years.

To be considered for testing, contact the Department of Environmental Quality at: groundwater.monitoring@deq.oregon.gov or call 503-693-5736.