Preliminary Geologic Assessment and PFAS Occurrence in Western Cheney, Washington
Faculty Mentor
Chad Pritchard
Presentation Type
Poster
Start Date
4-14-2026 9:00 AM
End Date
4-14-2026 11:00 AM
Location
PUB NCR
Primary Discipline of Presentation
Geosciences
Abstract
In 2021 Cheney Water Well #5 was closed due to toxic per- and polyfluoroalkyl substances (PFAS) levels above the current State Action Limits and the National Drinking Water Protection Act, which is a concern since PFAS has been associated to types of cancer, birth defects, and other negative human and environmental health concerns. The City of Cheney also tested two downgradient deep-groundwater-wells (Cheney wells #6 and 7) and halted investigation due to the wells being below state and federal drinking water standards. However, a local resident’s shallow groundwater well tested to be above federal and state levels of PFOS, which is a type of PFAS. In a 2023 report by Esvelt Environmental Engineering and Budinger and Associates, a time series sampling during pumping of the well resulted in increasing levels of PFAS variations, including a long-chain 6:2 FTS that is normally associated directly with contamination, indicating the contamination is near or above the well. Therefore, more work is needed to delineate PFAS contamination in the shallow groundwater that many residences use down groundwater gradient from Cheney Water Well #5. EWU sampled wells at the Cheney campus were non-detect for PFAS, which are upgradient of Cheney Water Well #5. EWU Geosciences sampled nine downgradient wells, which three in the shallow Wanapum Basalt aquifer tested above the drinking water standard. Wells sampled in the lower aquifers, Grande Ronde Basalt were generally non-detect for PFAS. Groundwater is between 80ft and 250ft in the Wanapum Basalt and Grand Ronde aquifers, respectively. Based on these findings it seems likely that contamination came from near the Cheney Water Well #5 and has migrated to the SW in the shallow basalt.
Recommended Citation
Frandsen, Sydney, "Preliminary Geologic Assessment and PFAS Occurrence in Western Cheney, Washington" (2026). 2026 Symposium. 18.
https://dc.ewu.edu/srcw_2026/ps_2026/p1_2026/18
Creative Commons License
This work is licensed under a Creative Commons Attribution-NonCommercial-No Derivative Works 4.0 International License.
Preliminary Geologic Assessment and PFAS Occurrence in Western Cheney, Washington
PUB NCR
In 2021 Cheney Water Well #5 was closed due to toxic per- and polyfluoroalkyl substances (PFAS) levels above the current State Action Limits and the National Drinking Water Protection Act, which is a concern since PFAS has been associated to types of cancer, birth defects, and other negative human and environmental health concerns. The City of Cheney also tested two downgradient deep-groundwater-wells (Cheney wells #6 and 7) and halted investigation due to the wells being below state and federal drinking water standards. However, a local resident’s shallow groundwater well tested to be above federal and state levels of PFOS, which is a type of PFAS. In a 2023 report by Esvelt Environmental Engineering and Budinger and Associates, a time series sampling during pumping of the well resulted in increasing levels of PFAS variations, including a long-chain 6:2 FTS that is normally associated directly with contamination, indicating the contamination is near or above the well. Therefore, more work is needed to delineate PFAS contamination in the shallow groundwater that many residences use down groundwater gradient from Cheney Water Well #5. EWU sampled wells at the Cheney campus were non-detect for PFAS, which are upgradient of Cheney Water Well #5. EWU Geosciences sampled nine downgradient wells, which three in the shallow Wanapum Basalt aquifer tested above the drinking water standard. Wells sampled in the lower aquifers, Grande Ronde Basalt were generally non-detect for PFAS. Groundwater is between 80ft and 250ft in the Wanapum Basalt and Grand Ronde aquifers, respectively. Based on these findings it seems likely that contamination came from near the Cheney Water Well #5 and has migrated to the SW in the shallow basalt.
