What a PFAS Laboratory Report Actually Shows for Cordova's Water
Laboratory reports from the EPA’s UCMR5 survey for the Cordova City Water system, serving the Valdez-Cordova Census Area, show measurements for per- and polyfluoroalkyl substances (PFAS), often called 'forever chemicals.' These reports list concentrations in nanograms per litre (ng/L), equivalent to parts per trillion (ppt). The report includes compounds such as PFOA, PFOS, PFHxS, PFNA, HFPO-DA, PFBS, PFHxA, PFPeA, PFBA, and PFHpA. For Cordova's system, all except PFBA were repeatedly below their respective reporting levels during the 2023-2024 monitoring period.
Differences in UCMR5 Compared to Earlier PFAS Monitoring
The UCMR5 monitoring focuses on a wider range of PFAS compounds than its predecessor UCMR3, measuring more substances and at lower reporting levels. UCMR5 provides a finer detection capability, down to thousandths of a microgram per litre, helping identify even very low concentrations of these fluorinated compounds in public water systems like Cordova's, which uses surface water as its source. This increased sensitivity allows for more detailed data but does not by itself indicate safety or health issues.
Understanding Nanograms per Litre and What Four Decimal Places Mean in Measurements
PFAS concentrations such as 0.004 µg/L correspond to 4 ng/L, reflecting the high precision of modern analytical instruments. Four decimal places represent measurement sensitivity rather than exact chemical quantity in everyday terms. This precision means even trace detections can be reliably reported, but detected traces below the upcoming federal maximum contaminant levels (MCLs) are not considered violations.
Measured Ranges Against Federal Standards and Their Meaning
In Cordova’s public water system, none of the PFAS compounds including PFOA and PFOS exceeded their federal MCLs set at 4 ng/L for these two and 10 ng/L for others. PFBA had one detection slightly above its reporting level (0.0371 µg/L), but this value is still below any federal health-based limit. This data does not indicate unsafe water; rather, it documents monitored concentrations over a series of samples.
Sample Size and Its Impact on Data Confidence
The data consists of 11 samples per compound collected over the monitoring period, representing the system’s supply but not individual homes. While this offers a reasonable snapshot of system-wide water quality, the sample size is limited, so localized variations at a single residence’s tap cannot be ruled out without direct testing of that water.
Comparing Cordova's PFAS Data with Neighboring Areas
When comparing Cordova’s data with neighboring counties, it is important not to generalize findings beyond their geographic and system scope. Different water sources and treatment practices influence PFAS presence. Hence, a detection or non-detection in one system does not predict individual home water quality or nearby areas with separate water supplies.
Information to Collect Before Considering Treatment Options
Before choosing water treatment approaches, residents should record their own water test results showing specific PFAS concentrations. Note the compounds tested, detection levels, and units reported. Also consider the water source type and any known local issues. This information is essential when evaluating treatment technologies that target PFAS removal effectively.
Recommended Testing and Decision Point
For households in Cordova concerned about PFAS, the key step is to commission a detailed water test for all relevant per- and polyfluoroalkyl substances at a qualified laboratory. Knowing your home’s specific PFAS profile—including any PFOA, PFOS, and PFBA levels—will allow an accurate treatment decision. Should concentrations be measurable and above personal tolerance, the Pentair PFAS Forever Chemicals Filter ships ready to configure and offers a documented approach to reduce these fluorinated compounds from residential water.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2024-12-30. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for CORDOVA CITY WATER (AK2293205), AK: 110 results across 10 listed contaminants, 1 detections above the reporting level; compared with the applicable federal MCL, none above
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