Understanding PFAS Levels in Missoula Water: What Local Data Means for Your Household

1. What 'detected', 'median' and 'range' Mean in the Sampling Record on This Page

The EPA's data for Missoula Water system, covering groundwater sources serving over 68,000 residents, is based on federal monitoring under the Unregulated Contaminant Monitoring Rule (UCMR5). The term “detected” indicates that an instrument measured a certain PFAS chemical above a reporting threshold, but this is not a statement of a violation or an unsafe level. The median and range describe the variation and central tendency of results across different samples taken within the system, reflecting conditions at the system level rather than any individual tap or home. In Missoula's case, none of the 46 samples showed PFAS compounds such as PFOA or PFOS above their respective reporting levels or upcoming federal limits.

2. What You Should Write Down Before Asking Anyone for Treatment Advice

If you want to understand PFAS in your household water, record these key details: your exact water source (e.g., municipal or private well), any recent water quality reports you have received, and any specific concerns or observed issues such as taste, odor, or unusual staining. Knowing if your water source is connected to Missoula Water or another system is essential since the publicly available data applies only to the former. Also consider whether your plumbing or filtration devices have been recently changed, as these can influence water characteristics.

3. Maintenance Rhythm of the Documented Technology in Plain Terms

The C-Series PFAS Forever Chemicals Filter ships ready to configure for household use and is designed to reduce PFAS exposure when present. This filtration system requires periodic filter element replacement to maintain effectiveness against PFAS compounds. While specific intervals depend on household water use and local water quality, a straightforward replacement schedule ensures ongoing treatment performance. The system’s maintenance does not involve additional complex servicing beyond swapping filter cartridges as guided by product instructions.

4. How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means

The Missoula Water system’s PFAS data represents 46 samples taken over a multi-year period from groundwater sources supplying the municipal system. This sample size provides a broad snapshot of system-wide water quality, but it does not predict individual home water quality precisely. A smaller or less frequent sampling program might miss occasional fluctuations, so the absence of detected PFAS at reporting levels does not guarantee every single well or tap is identical. For definitive knowledge about your home's water, a private water test targeting PFAS compounds is necessary.

5. How to Judge Treatment Capacity Against the Household's or Facility's Daily Demand

Choosing a treatment system like the C-Series filter involves matching its capacity to your daily water use. Households with higher water consumption or multiple residents may require filters rated for larger volumes or more frequent filter changes to maintain PFAS reduction effectively. Understanding your average daily water use and peak demand times helps ensure the system selected can handle your needs without loss of performance or premature cartridge replacement.

In summary, the EPA's monitoring confirms that Missoula’s public water system has no measured PFAS above reporting levels or forthcoming federal maximum contaminant levels, based on extensive groundwater sampling. This data reflects system-wide conditions, not individual homes. To assess your water’s PFAS levels, consider testing your own supply. The C-Series PFAS Forever Chemicals Filter is a documented technology designed to reduce PFAS when present, with manageable maintenance aligned to household water use. For more detailed information, consult the EPA’s SDWIS public water system records.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2026-01-12. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR5 monitoring (2023-2025) for MISSOULA WATER (MT0000294), MT: 460 results across 10 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level