- PWSID
- OH2903412
- State
- Ohio
- System type
- community water system (CWS)
- Population served
- 16,551
- City
- Vandalia
- Counties
- Greene County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2024-02-06 to 2024-09-18 · 4 entry point(s) · water types: GW
- Service-area boundary
- EPA-modeled (Random Forest) — approximate: estimated by EPA with a statistical model, not a surveyed service area
Hazard Index 1–3 × its limit highest single result
PFOS 1–3 × its limit worst entry-point average
Open on the Ohio map · All Ohio 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) | <MRL | 0 | 4 |
| PFOS (ppt) | 5 | 4.95 | 4 |
| Hazard Index | 1.304 | 0.652 | 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 Ohio PFAS drinking-water standard in effect or proposed as of 2026-10-17: No Ohio-specific PFAS drinking-water MCL; Ohio EPA follows federal values.
Sampling history
Sampled 2024-02-06 to 2024-09-18 · 4 entry point(s) · water types: GW · 13 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-02-06 | Softening Plant 1229 (STU 3)(from STU 2) (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-02-06 | Softening Plant 857 (STU 4)(from STU 1) (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-02-06 | Treatment Plant 172 (STU 2)(Wells 1-3 & 7) (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-02-06 | Treatment Plant 855 (STU 1)(Wells 8 & 9) (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-04-23 | Softening Plant 1229 (STU 3)(from STU 2) (GW) | SE1 | <4 | <4 | 1.304 | PFBA 7.8, PFHpA 3.7, PFHxA 24, PFPeA 22 |
| 2024-04-23 | Softening Plant 857 (STU 4)(from STU 1) (GW) | SE1 | <4 | <4 | 1.304 | PFBA 8.5, PFHpA 3.7, PFHxA 25, PFPeA 22 |
| 2024-04-23 | Treatment Plant 172 (STU 2)(Wells 1-3 & 7) (GW) | SE1 | <4 | 5 | 0.393 | none |
| 2024-04-23 | Treatment Plant 855 (STU 1)(Wells 8 & 9) (GW) | SE1 | <4 | <4 | 1.304 | PFBA 8, PFHpA 3.6, PFHxA 25, PFPeA 23 |
| 2024-08-06 | Softening Plant 1229 (STU 3)(from STU 2) (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-08-06 | Softening Plant 857 (STU 4)(from STU 1) (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-08-06 | Treatment Plant 172 (STU 2)(Wells 1-3 & 7) (GW) | SE2 | n/a | n/a | n/a | none |
| 2024-08-06 | Treatment Plant 855 (STU 1)(Wells 8 & 9) (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-09-18 | Treatment Plant 172 (STU 2)(Wells 1-3 & 7) (GW) | SE2 | <4 | 4.9 | 0.344 | none |
“<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
240 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.
Softening Plant 1229 (STU 3)(from STU 2) facility 60517 · sample point EP003 · groundwater
| Compound | MRL | 2024-02-06 SE1 | 2024-04-23 SE1 | 2024-08-06 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 7.8 | < 5 |
| PFBS | 3 ppt | – | 7.4 | < 3 |
| PFHpA | 3 ppt | – | 3.7 | < 3 |
| PFHxA | 3 ppt | – | 24 | < 3 |
| PFHxS | 3 ppt | – | 13 | < 3 |
| PFPeA | 3 ppt | – | 22 | < 3 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 |
| 6:2 FTS | 5 ppt | – | < 5 | < 5 |
| 8:2 FTS | 5 ppt | – | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | – | < 2 | < 2 |
| ADONA | 3 ppt | – | < 3 | < 3 |
| HFPO-DA | 5 ppt | – | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 |
| NFDHA | 20 ppt | – | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 |
| PFDA | 3 ppt | – | < 3 | < 3 |
| PFDoA | 3 ppt | – | < 3 | < 3 |
| PFEESA | 3 ppt | – | < 3 | < 3 |
| PFHpS | 3 ppt | – | < 3 | < 3 |
| PFMBA | 3 ppt | – | < 3 | < 3 |
| PFMPA | 4 ppt | – | < 4 | < 4 |
| PFNA | 4 ppt | – | < 4 | < 4 |
| PFOA | 4 ppt | – | < 4 | < 4 |
| PFOS | 4 ppt | – | < 4 | < 4 |
| PFPeS | 4 ppt | – | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | – | < 8 |
| PFTrDA | 7 ppt | < 7 | – | < 7 |
| PFUnA | 2 ppt | – | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | – | < 9 |
Softening Plant 857 (STU 4)(from STU 1) facility 60518 · sample point EP004 · groundwater
| Compound | MRL | 2024-02-06 SE1 | 2024-04-23 SE1 | 2024-08-06 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 8.5 | < 5 |
| PFBS | 3 ppt | – | 7.1 | < 3 |
| PFHpA | 3 ppt | – | 3.7 | < 3 |
| PFHxA | 3 ppt | – | 25 | < 3 |
| PFHxS | 3 ppt | – | 13 | < 3 |
| PFPeA | 3 ppt | – | 22 | < 3 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 |
| 6:2 FTS | 5 ppt | – | < 5 | < 5 |
| 8:2 FTS | 5 ppt | – | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | – | < 2 | < 2 |
| ADONA | 3 ppt | – | < 3 | < 3 |
| HFPO-DA | 5 ppt | – | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 |
| NFDHA | 20 ppt | – | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 |
| PFDA | 3 ppt | – | < 3 | < 3 |
| PFDoA | 3 ppt | – | < 3 | < 3 |
| PFEESA | 3 ppt | – | < 3 | < 3 |
| PFHpS | 3 ppt | – | < 3 | < 3 |
| PFMBA | 3 ppt | – | < 3 | < 3 |
| PFMPA | 4 ppt | – | < 4 | < 4 |
| PFNA | 4 ppt | – | < 4 | < 4 |
| PFOA | 4 ppt | – | < 4 | < 4 |
| PFOS | 4 ppt | – | < 4 | < 4 |
| PFPeS | 4 ppt | – | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | – | < 8 |
| PFTrDA | 7 ppt | < 7 | – | < 7 |
| PFUnA | 2 ppt | – | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | – | < 9 |
Treatment Plant 172 (STU 2)(Wells 1-3 & 7) facility 60516 · sample point EP002 · groundwater
| Compound | MRL | 2024-02-06 SE1 | 2024-04-23 SE1 | 2024-08-06 SE2 | 2024-09-18 SE2 |
|---|---|---|---|---|---|
| PFBS | 3 ppt | – | 6.3 | – | 7.2 |
| PFHxS | 3 ppt | – | 3.9 | – | 3.4 |
| PFOS | 4 ppt | – | 5 | – | 4.9 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | – | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | – | < 3 |
| 6:2 FTS | 5 ppt | – | < 5 | – | < 5 |
| 8:2 FTS | 5 ppt | – | < 5 | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | – | < 2 | – | < 2 |
| ADONA | 3 ppt | – | < 3 | – | < 3 |
| HFPO-DA | 5 ppt | – | < 5 | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 | – |
| NFDHA | 20 ppt | – | < 20 | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 | – |
| PFBA | 5 ppt | – | < 5 | – | < 5 |
| PFDA | 3 ppt | – | < 3 | – | < 3 |
| PFDoA | 3 ppt | – | < 3 | – | < 3 |
| PFEESA | 3 ppt | – | < 3 | – | < 3 |
| PFHpA | 3 ppt | – | < 3 | – | < 3 |
| PFHpS | 3 ppt | – | < 3 | – | < 3 |
| PFHxA | 3 ppt | – | < 3 | – | < 3 |
| PFMBA | 3 ppt | – | < 3 | – | < 3 |
| PFMPA | 4 ppt | – | < 4 | – | < 4 |
| PFNA | 4 ppt | – | < 4 | – | < 4 |
| PFOA | 4 ppt | – | < 4 | – | < 4 |
| PFPeA | 3 ppt | – | < 3 | – | < 3 |
| PFPeS | 4 ppt | – | < 4 | – | < 4 |
| PFTA | 8 ppt | < 8 | – | < 8 | – |
| PFTrDA | 7 ppt | < 7 | – | < 7 | – |
| PFUnA | 2 ppt | – | < 2 | – | < 2 |
| lithium | 9 µg/L | < 9 | – | < 9 | – |
Treatment Plant 855 (STU 1)(Wells 8 & 9) facility 54601 · sample point EP001 · groundwater
| Compound | MRL | 2024-02-06 SE1 | 2024-04-23 SE1 | 2024-08-06 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 8 | < 5 |
| PFBS | 3 ppt | – | 7.3 | < 3 |
| PFHpA | 3 ppt | – | 3.6 | < 3 |
| PFHxA | 3 ppt | – | 25 | < 3 |
| PFHxS | 3 ppt | – | 13 | < 3 |
| PFPeA | 3 ppt | – | 23 | < 3 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 |
| 6:2 FTS | 5 ppt | – | < 5 | < 5 |
| 8:2 FTS | 5 ppt | – | < 5 | < 5 |
| 9Cl-PF3ONS | 2 ppt | – | < 2 | < 2 |
| ADONA | 3 ppt | – | < 3 | < 3 |
| HFPO-DA | 5 ppt | – | < 5 | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – | < 5 |
| NFDHA | 20 ppt | – | < 20 | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – | < 6 |
| PFDA | 3 ppt | – | < 3 | < 3 |
| PFDoA | 3 ppt | – | < 3 | < 3 |
| PFEESA | 3 ppt | – | < 3 | < 3 |
| PFHpS | 3 ppt | – | < 3 | < 3 |
| PFMBA | 3 ppt | – | < 3 | < 3 |
| PFMPA | 4 ppt | – | < 4 | < 4 |
| PFNA | 4 ppt | – | < 4 | < 4 |
| PFOA | 4 ppt | – | < 4 | < 4 |
| PFOS | 4 ppt | – | < 4 | < 4 |
| PFPeS | 4 ppt | – | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | – | < 8 |
| PFTrDA | 7 ppt | < 7 | – | < 7 |
| PFUnA | 2 ppt | – | < 2 | < 2 |
| lithium | 9 µg/L | < 9 | – | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 8 | 62% | 7.4 2024-04-23 | 4.41–5.54 | 6.3 | 7.2 | 7.4 | 7.4 |
| PFHxS | 8 | 62% | 13 2024-04-23 | 5.79–6.91 | 3.4 | 13 | 13 | 13 |
| PFBA | 8 | 38% | 8.5 2024-04-23 | 3.04–6.16 | <MRL | 7.8 | 8.5 | 8.5 |
| PFHpA | 8 | 38% | 3.7 2024-04-23 | 1.38–3.25 | <MRL | 3.6 | 3.7 | 3.7 |
| PFHxA | 8 | 38% | 25 2024-04-23 | 9.25–11.12 | <MRL | 24 | 25 | 25 |
| PFPeA | 8 | 38% | 23 2024-04-23 | 8.38–10.25 | <MRL | 22 | 23 | 23 |
| PFOS | 8 | 25% | 5 2024-04-23 | 1.24–4.24 | <MRL | <MRL | 5 | 5 |
Never detected (23): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, PFNA, PFOA, PFPeS, PFTA, PFTrDA, PFUnA, lithium.
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 2023-01-09 to 2026-03-31; 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 9d02e90cf16d · 2026-10-18T04:07Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.