The data collected for the public water system serving Olmsted County, including the City of Rochester, shows occasional detection of 1,4-dioxane in groundwater sources. This federal data reflects measurements taken at the system level between 2013 and 2015, not individual household taps. If your home’s existing water treatment for 1,4-dioxane no longer functions as expected, understanding what this information means for you is critical before taking further action.
If You Know the Depth or Source Type of Your Well or Supply
Government monitoring describes system-wide groundwater sources, which can vary in depth and composition. Shallower wells or differing aquifers may show different levels than the public system averages. Without specific testing of your water, it is impossible to know your exact 1,4-dioxane concentration. The federal record found two detections slightly above the reporting level but well below EPA’s risk reference concentrations. This suggests that water from groundwater sources in the region generally contains low levels by those measures, but your well could diverge.
If You Are Considering How to Confirm Your Household Water Quality
Start with simple steps like checking if your current treatment stopped functioning, including any filters or adsorptive media performance. When those checks don’t explain it, collect a water sample for certified lab analysis specifically measuring 1,4-dioxane. Only such a test can confirm your home’s water concentration. This targeted testing informs whether treatment technology designed for 1,4-dioxane is warranted or requires adjustment.
If You Are Assessing What Changes to Expect After Adding a Treatment Device
When a properly configured Fleck 1,4-Dioxane Filter is added, water at your taps is processed to reduce 1,4-dioxane levels below the untreated incoming water. Although no product performance numbers are published here, this technology is specifically documented to address 1,4-dioxane. After treatment, you may notice improved clarity and reduced chemical presence related to this contaminant. Regular monitoring of your system’s performance is recommended to maintain effective treatment.
If You Wonder What Detection Data Means in the Context of Local Monitoring
The sampling record lists 14 measurements for 1,4-dioxane, with two detections just above the reporting threshold of 0.07 micrograms per liter. The highest recorded value was 0.072 micrograms per liter, and the median of detected samples was about 0.0715 micrograms per liter. These numbers mean instruments measured 1,4-dioxane at low levels, not that these levels are violations or unsafe. The EPA has not set a legal maximum contaminant level for 1,4-dioxane, but it has established a cancer risk reference concentration of 0.35 micrograms per liter, which the reported values do not exceed.
If You Are Considering the Difference Between Aesthetic Standards and Health-Based Limits for 1,4-Dioxane
Unlike some other constituents, 1,4-dioxane does not have an aesthetic secondary standard because it is typically odor- and taste-neutral at low levels. Any treatment decisions should focus on health-based guidelines rather than aesthetic considerations. The public system’s record shows no health-based violations for 1,4-dioxane, indicating compliance with federal health guidelines. This distinction helps in evaluating whether treatment addresses health concerns or primarily improves cosmetic effects.
The EPA public water system record referenced here covers the municipal supply for Olmsted County, MN, serving over 123,000 people through more than 42,000 connections. It documents 1,4-dioxane monitoring results in groundwater sources but does not reflect individual household plumbing conditions. For more information, consult the EPA’s Safe Drinking Water Information System public water system data.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-11-03. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Rochester (MN1550010), MN: 14 results across 1 listed contaminants, 2 detections above the reporting level; no federal MCL; EPA cancer risk reference concentration 0.35 ug/L
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