- PWSID
- VA6061129
- State
- Virginia
- System type
- community water system (CWS)
- Population served
- 4,250
- City
- Warrenton
- Counties
- Fauquier County
- Primary source water
- groundwater under the influence of surface water
- UCMR 5 sampling
- 2025-03-18 to 2025-12-17 · 3 entry point(s) · water types: GU
- Service-area boundary
- EPA-modeled (Random Forest) — approximate: estimated by EPA with a statistical model, not a surveyed service area
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 3 × its limit worst entry-point average
Open on the Virginia map · All Virginia systems · All results
These are monitoring results collected under EPA's Fifth Unregulated Contaminant Monitoring Rule (UCMR 5) at entry points, where treated water enters the distribution system; they are not tap-water samples. They are not compliance determinations: compliance with EPA's 2024 PFAS limits is judged on running annual averages of compliance monitoring, required from 2029, so a single UCMR 5 result at or above a limit is not a violation. “< MRL” means the compound was not quantified at EPA's minimum reporting level; it does not mean zero.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 44.6 | 23.12 | 4 |
| PFOS (ppt) | 31.1 | 14.65 | 4 |
| Hazard Index | 1.259 | 0.495 | 1.0† |
“<MRL” = every result for the compound was below its reporting limit. * Mean of all samples at each entry point with non-detects = 0 (EPA compliance convention; the Hazard Index also uses non-detects = 0); a screening comparison, not a formal running annual average. † Rescission proposed May 2026. PFOA/PFOS MCL 4 ppt (2024 NPDWR, in effect). PFHxS, PFNA, HFPO-DA (10 ppt each) and the Hazard Index (1.0) are 2024 NPDWR values; EPA proposed rescinding them on 18 May 2026 (comment period closed 20 Jul 2026).
No Virginia PFAS drinking-water standard in effect or proposed as of 2026-10-17: No Virginia-specific PFAS drinking-water MCL; Va. Code 62.1-44.34:29 defines PFAS MCL by reference to EPA's NPDWR.
Sampling history
Sampled 2025-03-18 to 2025-12-17 · 3 entry point(s) · water types: GU · 12 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-03-18 | BEALETON REGIONAL (GU) | SE1 | <4 | <4 | 0 | PFBA 6.6, PFHxA 4.4, PFPeA 7.7, lithium 67.1 µg/L |
| 2025-03-18 | BEALETON REGIONAL (GU) | SE1 | 20.3 | 13.7 | 0.386 | PFBA 6.7, PFHpA 6.6, PFHxA 7.2, PFPeA 7.5, lithium 41.4 µg/L |
| 2025-03-18 | BEALETON REGIONAL (GU) | SE1 | 19.9 | 11.7 | 0.376 | PFBA 6.6, PFHpA 6.6, PFHxA 7.5, PFPeA 7.7, lithium 39.4 µg/L |
| 2025-06-16 | BEALETON REGIONAL (GU) | SE2 | <4 | <4 | 0 | PFBA 7.3, PFHxA 3.8, PFPeA 7.1, lithium 86 µg/L |
| 2025-06-16 | BEALETON REGIONAL (GU) | SE2 | 44.3 | 31.1 | 1.259 | PFBA 9.7, PFHpA 14.9, PFHxA 17.8, PFPeA 16.5, lithium 27.1 µg/L |
| 2025-06-16 | BEALETON REGIONAL (GU) | SE2 | 44.6 | 28.5 | 1.219 | PFBA 9.4, PFHpA 15.4, PFHxA 17.6, PFPeA 16.9, lithium 27.8 µg/L |
| 2025-09-24 | BEALETON REGIONAL (GU) | SE3 | <4 | <4 | 0.002 | PFBA 7.3, PFHxA 4.3, PFPeA 7.5, lithium 80.4 µg/L |
| 2025-09-24 | BEALETON REGIONAL (GU) | SE3 | 17.3 | 8.5 | 0.334 | PFBA 6.9, PFHpA 5.6, PFHxA 7, PFPeA 7.7, lithium 52.7 µg/L |
| 2025-09-24 | BEALETON REGIONAL (GU) | SE3 | 16 | 8.4 | 0.304 | PFBA 6.5, PFHpA 5.4, PFHxA 6.6, PFPeA 7.5, lithium 52.3 µg/L |
| 2025-12-15 | BEALETON REGIONAL (GU) | SE4 | <4 | <4 | 0 | PFDA 3, PFHxA 3.4, PFPeA 6.2, lithium 48.3 µg/L |
| 2025-12-17 | BEALETON REGIONAL (GU) | SE4 | 9.4 | 5.3 | 0.003 | PFHpA 3.2, PFHxA 3.7, PFPeA 4.2, lithium 45.8 µg/L |
| 2025-12-17 | BEALETON REGIONAL (GU) | SE4 | 12 | 5.5 | 0.003 | PFBA 5, PFHpA 4.4, PFHxA 5.1, PFPeA 5.5, lithium 49.4 µg/L |
“<4” = not detected at the reporting limit shown; “n/a” = not analyzed in that sample. Highlighted = at or above the 4 ppt MCL. HI computed per sample with non-detects as 0. Other detections lists every other quantified compound (lithium in µg/L).
All results by entry point
360 results. Each column is one sampling visit (date and UCMR 5 sample event). A number is a measured concentration; “< 4” = below the minimum reporting level shown; “–” = not analyzed in that visit. PFAS in ppt (ng/L); lithium in µg/L.
BEALETON REGIONAL facility EP003 · sample point EP003 · groundwater under the influence of surface water
| Compound | MRL | 2025-03-18 SE1 | 2025-06-16 SE2 | 2025-09-24 SE3 | 2025-12-15 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.6 | 7.3 | 7.3 | < 5 |
| PFBS | 3 ppt | < 3 | < 3 | 3.1 | < 3 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | 3 |
| PFHxA | 3 ppt | 4.4 | 3.8 | 4.3 | 3.4 |
| PFPeA | 3 ppt | 7.7 | 7.1 | 7.5 | 6.2 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFDoA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHxS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFOA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFOS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | 67.1 | 86 | 80.4 | 48.3 |
BEALETON REGIONAL facility EP007 · sample point EP007 · groundwater under the influence of surface water
| Compound | MRL | 2025-03-18 SE1 | 2025-06-16 SE2 | 2025-09-24 SE3 | 2025-12-17 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.7 | 9.7 | 6.9 | < 5 |
| PFBS | 3 ppt | 11.4 | 18.8 | 8.9 | 5.2 |
| PFHpA | 3 ppt | 6.6 | 14.9 | 5.6 | 3.2 |
| PFHxA | 3 ppt | 7.2 | 17.8 | 7 | 3.7 |
| PFHxS | 3 ppt | 3.8 | 7.5 | 3.3 | < 3 |
| PFNA | 4 ppt | < 4 | 5 | < 4 | < 4 |
| PFOA | 4 ppt | 20.3 | 44.3 | 17.3 | 9.4 |
| PFOS | 4 ppt | 13.7 | 31.1 | 8.5 | 5.3 |
| PFPeA | 3 ppt | 7.5 | 16.5 | 7.7 | 4.2 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | 41.4 | 27.1 | 52.7 | 45.8 |
BEALETON REGIONAL facility EP008 · sample point EP008 · groundwater under the influence of surface water
| Compound | MRL | 2025-03-18 SE1 | 2025-06-16 SE2 | 2025-09-24 SE3 | 2025-12-17 SE4 |
|---|---|---|---|---|---|
| PFBA | 5 ppt | 6.6 | 9.4 | 6.5 | 5 |
| PFBS | 3 ppt | 11.5 | 18.5 | 8.5 | 6.5 |
| PFHpA | 3 ppt | 6.6 | 15.4 | 5.4 | 4.4 |
| PFHxA | 3 ppt | 7.5 | 17.6 | 6.6 | 5.1 |
| PFHxS | 3 ppt | 3.7 | 7.5 | 3 | < 3 |
| PFNA | 4 ppt | < 4 | 4.6 | < 4 | < 4 |
| PFOA | 4 ppt | 19.9 | 44.6 | 16 | 12 |
| PFOS | 4 ppt | 11.7 | 28.5 | 8.4 | 5.5 |
| PFPeA | 3 ppt | 7.7 | 16.9 | 7.5 | 5.5 |
| 11Cl-PF3OUdS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 4:2 FTS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 6:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 8:2 FTS | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| ADONA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| HFPO-DA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| NFDHA | 20 ppt | < 20 | < 20 | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | < 6 | < 6 | < 6 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDoA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFEESA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFHpS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFPeS | 4 ppt | < 4 | < 4 | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 | < 2 | < 2 |
| lithium | 9 µg/L | 39.4 | 27.8 | 52.3 | 49.4 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFHxA | 12 | 100% | 17.8 2025-06-16 | 7.37–7.37 | 5.1 | 7.2 | 17.6 | 17.8 |
| PFPeA | 12 | 100% | 16.9 2025-06-16 | 8.5–8.5 | 7.5 | 7.7 | 16.5 | 16.9 |
| lithium | 12 | 100% | 86 2025-06-16 | 51.48–51.48 | 48.3 | 52.7 | 80.4 | 86 |
| PFBA | 12 | 83% | 9.7 2025-06-16 | 6–6.83 | 6.6 | 7.3 | 9.4 | 9.7 |
| PFBS | 12 | 75% | 18.8 2025-06-16 | 7.7–8.45 | 6.5 | 11.4 | 18.5 | 18.8 |
| PFHpA | 12 | 67% | 15.4 2025-06-16 | 5.17–6.17 | 4.4 | 6.6 | 14.9 | 15.4 |
| PFOA | 12 | 67% | 44.6 2025-06-16 | 15.32–16.65 | 12 | 19.9 | 44.3 | 44.6 |
| PFOS | 12 | 67% | 31.1 2025-06-16 | 9.39–10.72 | 5.5 | 11.7 | 28.5 | 31.1 |
| PFHxS | 12 | 50% | 7.5 2025-06-16 | 2.4–3.9 | <MRL | 3.7 | 7.5 | 7.5 |
| PFNA | 12 | 17% | 5 2025-06-16 | 0.8–4.13 | <MRL | <MRL | 4.6 | 5 |
| PFDA | 12 | 8% | 3 2025-12-15 | 0.25–3 | <MRL | <MRL | <MRL | 3 |
Never detected (19): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, PFPeS, PFTA, PFTrDA, PFUnA.
Left-censored Kaplan–Meier statistics (Helsel 2005; Helsel & Lee 2006, NADA for R). Units: ppt; lithium µg/L. Each compound has one reporting limit, so the Kaplan–Meier mean equals the upper mean bound (non-detects at the MRL); the lower bound sets non-detects to 0. “<MRL” = the percentile falls below the reporting limit and cannot be estimated. These describe this system's UCMR 5 samples, not population estimates.
Sources
- EPA UCMR 5 occurrence data text files (UCMR5_All.txt; samples 2023-01-10 to 2026-03-04; data summary dated Jul 2026)
- EPA SDWIS via ECHO SDWA downloads, quarter 2026Q3
- EPA Public Water System Service Areas v3 (Mar 2026)
- US Census Bureau cartographic boundary counties 1:500k, 2024
- EPA/USGS NHDPlus V2 (medium resolution) flowlines, Strahler order 2+
Data build c525414e2fcb · 2026-10-18T04:06Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.