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EPCOR is committed to providing its customers with clean, reliable water, conducting more than 300,000 water quality tests every year. A critical step in delivering on this promise is continuously striving to increase our understanding of manmade Polyfluoroalkyl and Perfluoroalkyl substances (PFAS) and their potentially hazardous impacts on public health.
While there is no current EPA requirement or regulatory standard for PFAS, on March 29, 2023, the EPA proposed drinking water standards for six PFAS contaminants:
PFOA
4 parts per trillion (ppt)
PFOS
4 ppt
PFNA
1 (unitless) Hazard Index
PFHxS
PFBS
HFPO-DA (commonly referred to as GenX Chemicals)
In late 2018, we detected trace amounts of PFAS in a small number of water supply wells. Out of an abundance of caution, EPCOR made the immediate decision to take these wells offline and limit their use for the city’s drinking water supply.
EPA’s proposed drinking water standard is that concentrations of two individual PFAS contaminants – PFOA and PFOS – should not exceed 4 parts per trillion (ppt), combined. One part per trillion is the equivalent of a single second in 31,500 years. The EPA determined that its proposed standard provides even the most sensitive populations with a margin of protection from a lifetime of exposure to PFOA and PFOS from drinking water. The EPA expects to finalize the new PFAS drinking water standards in early 2024. When this new standard becomes effective, all water providers in the United States will be required to meet the new standard within three years from that point.
If you are concerned about potential health effects from exposure to these PFAS above the health advisory level, contact your doctor or healthcare professional.Learn more
If this new standard becomes effective, all water providers in the United States will be required to meet the new standard within three years from that point.
At EPCOR, we have already been monitoring all of our water sources for PFAS and developing a plan to ensure that our water sources will meet newer, more stringent requirements as they become the new standard. This includes infrastructure improvements to add treatment processes that remove PFAS from water, examining the impact this will have on the cost of delivering your service, and identifying grants and other potential funding sources to help offset those necessary costs.
Today, approximately 90% of our 87 wells serving the Edgewood and Clovis areas show no indication of these manmade chemicals or measure at very low levels. When a well with low levels of PFAS is necessary to ensure service, it is blended and diluted with water from another source when an additional water source is available.
Today, we provide water from more than 100 wells and other water sources. More than 95% of our water sources across Arizona show no indication of these manmade chemicals. Wells where PFAS has measured above 4 ppt are not in operation and are irrigation wells that are not part of the drinking water system. When a well with low levels of PFAS is necessary to ensure service, it is blended and diluted with water from another source when an additional water source is available. We are actively developing a treatment approach to treat for PFAS and continue to carefully monitor all water sources.
Read the most current report on the quality of your drinking water.
