Government monitoring in Statesville's public water system operated by Iredell Water Corporation found multiple detections of PFAS compounds during 2024's UCMR5 survey, with some measurements above the federal reporting level but below health-based violation thresholds except for one water quality violation unrelated to PFAS.
Why PFOA and PFOS Are Reported in Nanograms per Litre and the Significance of Four Decimal Places
PFAS compounds such as PFOA and PFOS are measured in extremely low concentrations, expressed as nanograms per litre (ng/L), which are also known as parts per trillion (ppt). Four decimal places indicate detection sensitivity; for example, a PFOA detection of 0.0188 g/L corresponds to 18.8 ppt, reflecting very precise instrumentation since these substances are typically present in trace amounts in surface water sources.
The Hazard Index for Mixtures of Newer Fluorinated Compounds Without Health Claims
Modern monitoring includes a range of fluorinated compounds beyond PFOA and PFOS, such as PFBS, PFHxA, and PFPeA. While no definitive health-based limits exist yet for many of these newer compounds, evaluating a hazard index helps assess cumulative exposure potential. This index balances presence but does not confirm health risk in residential water, underscoring the importance of further testing for specific household water conditions.
Which Fluorinated Compounds in This Record Have 2024 Federal MCLs and Which Do Not
- PFOA and PFOS have federal maximum contaminant levels (MCLs) set at 4.0 ng/L effective 2024, with detections in this system measured above reporting levels but notably below or near these limits.
- PFHxS, PFNA, and HFPO-DA have established 2024 MCLs as well but showed no exceedances in this record.
- Other compounds such as PFBS, PFHxA, PFPeA, PFBA, and PFHpA do not yet have federal MCLs, meaning their detections serve as monitoring data rather than regulatory thresholds.
How Sample Depth, Well Depth, or Source Type Changes What to Expect in PFAS Detections
This system sources water from surface supply, explaining some PFAS detections consistent with surface water influence and environmental factors. Deeper well sources often show different PFAS profiles than surface or shallow wells. Sample depth affects detection sensitivity and variability, so household water results may differ based on your specific water source and plumbing configuration.
Comparing This Area's Record with a Neighboring County Without Overinterpretation
Neighboring regions may report varying PFAS levels due to differences in industrial history, water source types, and regional environmental factors. Comparing Statesville’s Iredell Water Corporation data cautiously, it shows similar trace detections without widespread exceedances of federal MCLs, indicating regional presence of these compounds but not uniform contamination of all household water supplies.
Household or Facility Symptoms Related to PFAS and What They Don’t Indicate
Common household issues like unpleasant taste or staining are not specifically caused by PFAS and typically relate to other water quality factors. PFAS are not detectable by taste or smell. If concerned about chemical exposures from 'forever chemicals,' targeted laboratory testing of your household water is necessary to determine if your supply reflects the public system's detections or differs significantly.
For homes in Statesville seeking to address detected PFAS, the Fleck PFAS Forever Chemicals Filter ships ready to configure and uses proven filtration technology designed to reduce per- and polyfluoroalkyl substances from water, providing a tailored response matched to your measured demand and water use.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2025-03-03. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR5 monitoring (2023-2025) for IREDELL WATER CORPORATION (NC0149025), NC: 800 results across 10 listed contaminants, 39 detections above the reporting level; 14 results above a 2024 federal MCL