- PWSID
- CA1910240
- State
- California
- System type
- community water system (CWS)
- Population served
- 292,014
- City
- Newhall
- Counties
- Los Angeles County, Ventura County
- Primary source water
- surface water
- UCMR 5 sampling
- 2023-06-07 to 2024-08-21 · 9 entry point(s) · water types: GW;MX
- Service-area boundary
- authoritative
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 3 × its limit worst entry-point average
Open on the California map · All California 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) | 16.9 | 13.95 | 4 |
| PFOS (ppt) | 7.5 | 6.95 | 4 |
| Hazard Index | 0.763 | 0.738 | 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).
Compared with California guidance levels
| Highest single result | Worst entry-point average* | California | |
|---|---|---|---|
| PFHxS (ppt) | 7.6 | 7.35 | 3 (guidance) |
| PFOA (ppt) | 16.9 | 13.95 | 4 (guidance) |
| PFOS (ppt) | 7.5 | 6.95 | 4 (guidance) |
| PFBS (ppt) | 6.9 | 6.9 | 500 (guidance) |
| PFHxA (ppt) | 14.2 | 10.4 | 1,000 (guidance) |
Sum standards add the listed compounds within each sample (non-detects = 0). State compliance is normally judged on averages over time; these are screening comparisons.
Sampling history
Sampled 2023-06-07 to 2024-08-21 · 9 entry point(s) · water types: GW;MX · 22 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-06-07 | Connection (MX) | SE1 | <4 | <4 | 0 | lithium 12.3 µg/L |
| 2023-06-07 | Well 160 (GW) | SE1 | <4 | <4 | 0 | lithium 39.6 µg/L |
| 2023-06-07 | Well E-15 (GW) | SE1 | 11 | 6.4 | 0.602 | PFBA 5.4, PFHpA 3.7, PFHxA 5.5, PFPeA 5.5, lithium 47.7 µg/L |
| 2023-06-07 | Well E-17 (GW) | SE1 | 10.6 | 4.8 | 0.713 | PFBA 5.3, PFHpA 3.9, PFHxA 4.6, PFPeA 4.9, lithium 53.1 µg/L |
| 2023-06-07 | Wells 206 & 207 (GW) | SE1 | 6.3 | 4.3 | 0.393 | PFBA 5.5, PFHxA 9.1, PFPeA 8, lithium 24.3 µg/L |
| 2023-06-21 | Well W-11 (GW) | SE1 | 4.6 | <4 | 0 | lithium 11.2 µg/L |
| 2023-06-21 | Well W-9 (GW) | SE1 | 10.9 | <4 | 0.003 | PFBA 7.2, PFHpA 4.1, PFHxA 7.5, PFPeA 6.8 |
| 2023-06-21 | Wells N, N7 & N8 (GW) | SE1 | <4 | <4 | 0 | PFBA 13.3, PFHxA 14.2, PFPeA 22.6 |
| 2023-09-13 | Connection (MX) | SE2 | <4 | <4 | 0 | lithium 13.7 µg/L |
| 2023-12-06 | Connection (MX) | SE3 | <4 | <4 | 0 | lithium 10.9 µg/L |
| 2023-12-06 | Well E-15 (GW) | SE2 | 16.9 | 7.5 | 0.623 | PFBA 5.9, PFHpA 6.3, PFHxA 7.8, PFPeA 8.4, lithium 41.3 µg/L |
| 2023-12-06 | Well E-17 (GW) | SE2 | 14.4 | 5.6 | 0.763 | PFBA 5.9, PFHpA 4.7, PFHxA 5.4, PFPeA 6, lithium 46.1 µg/L |
| 2023-12-06 | Wells N, N7 & N8 (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-12-20 | Well 160 (GW) | SE2 | <4 | <4 | 0 | lithium 38.7 µg/L |
| 2023-12-20 | Well W-11 (GW) | SE2 | <4 | <4 | 0 | lithium 12 µg/L |
| 2023-12-27 | Wells 206 & 207 (GW) | SE2 | <4 | <4 | 0.32 | lithium 22.4 µg/L |
| 2024-01-03 | Wells N, N7 & N8 (GW) | SE2 | <4 | <4 | 0 | PFBA 6.7, PFHxA 6.6, PFPeA 10.1 |
| 2024-03-13 | Connection (MX) | SE4 | <4 | <4 | 0 | lithium 10.1 µg/L |
| 2024-03-13 | Well Q-2 (GW) | SE1 | n/a | n/a | n/a | lithium 9.82 µg/L |
| 2024-04-04 | Well Q-2 (GW) | SE2 | <4 | <4 | 0 | PFBA 8.9, PFPeA 11.1 |
| 2024-08-07 | Well 160 (GW) | SE1 | n/a | n/a | n/a | none |
| 2024-08-21 | Wells 206 & 207 (GW) | SE1 | n/a | n/a | n/a | 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
540 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.
Connection facility 00022 · sample point 1910240022 · MX
| Compound | MRL | 2023-06-07 SE1 | 2023-09-13 SE2 | 2023-12-06 SE3 | 2024-03-13 SE4 |
|---|---|---|---|---|---|
| 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 |
| PFBA | 5 ppt | < 5 | < 5 | < 5 | < 5 |
| PFBS | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| PFDA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 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 |
| PFHxA | 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 |
| PFPeA | 3 ppt | < 3 | < 3 | < 3 | < 3 |
| 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 | 12.3 | 13.7 | 10.9 | 10.1 |
Well 160 facility 91823 · sample point 1910240823 · groundwater
| Compound | MRL | 2023-06-07 SE1 | 2023-12-20 SE2 | 2024-08-07 SE1 |
|---|---|---|---|---|
| 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 | – |
| PFBS | 3 ppt | < 3 | < 3 | – |
| 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 | – |
| PFHxS | 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 | – |
| 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 | 39.6 | 38.7 | – |
Well E-15 facility 91803 · sample point 1910240803 · groundwater
| Compound | MRL | 2023-06-07 SE1 | 2023-12-06 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.4 | 5.9 |
| PFBS | 3 ppt | 4.4 | 5.6 |
| PFHpA | 3 ppt | 3.7 | 6.3 |
| PFHxA | 3 ppt | 5.5 | 7.8 |
| PFHxS | 3 ppt | 6 | 6.2 |
| PFOA | 4 ppt | 11 | 16.9 |
| PFOS | 4 ppt | 6.4 | 7.5 |
| PFPeA | 3 ppt | 5.5 | 8.4 |
| 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 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | 47.7 | 41.3 |
Well E-17 facility 91828 · sample point 1910240828 · groundwater
| Compound | MRL | 2023-06-07 SE1 | 2023-12-06 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 5.3 | 5.9 |
| PFBS | 3 ppt | 6.9 | 6.9 |
| PFHpA | 3 ppt | 3.9 | 4.7 |
| PFHxA | 3 ppt | 4.6 | 5.4 |
| PFHxS | 3 ppt | 7.1 | 7.6 |
| PFOA | 4 ppt | 10.6 | 14.4 |
| PFOS | 4 ppt | 4.8 | 5.6 |
| PFPeA | 3 ppt | 4.9 | 6 |
| 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 |
| PFPeS | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | 53.1 | 46.1 |
Well Q-2 facility 91821 · sample point 1910240821 · groundwater
| Compound | MRL | 2024-03-13 SE1 | 2024-04-04 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | – | 8.9 |
| PFPeA | 3 ppt | – | 11.1 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 |
| 6:2 FTS | 5 ppt | – | < 5 |
| 8:2 FTS | 5 ppt | – | < 5 |
| 9Cl-PF3ONS | 2 ppt | – | < 2 |
| ADONA | 3 ppt | – | < 3 |
| HFPO-DA | 5 ppt | – | < 5 |
| NEtFOSAA | 5 ppt | < 5 | – |
| NFDHA | 20 ppt | – | < 20 |
| NMeFOSAA | 6 ppt | < 6 | – |
| PFBS | 3 ppt | – | < 3 |
| PFDA | 3 ppt | – | < 3 |
| PFDoA | 3 ppt | – | < 3 |
| PFEESA | 3 ppt | – | < 3 |
| PFHpA | 3 ppt | – | < 3 |
| PFHpS | 3 ppt | – | < 3 |
| PFHxA | 3 ppt | – | < 3 |
| PFHxS | 3 ppt | – | < 3 |
| PFMBA | 3 ppt | – | < 3 |
| PFMPA | 4 ppt | – | < 4 |
| PFNA | 4 ppt | – | < 4 |
| PFOA | 4 ppt | – | < 4 |
| PFOS | 4 ppt | – | < 4 |
| PFPeS | 4 ppt | – | < 4 |
| PFTA | 8 ppt | < 8 | – |
| PFTrDA | 7 ppt | < 7 | – |
| PFUnA | 2 ppt | – | < 2 |
| lithium | 9 µg/L | 9.82 | – |
Well W-11 facility 91804 · sample point 1910240804 · groundwater
| Compound | MRL | 2023-06-21 SE1 | 2023-12-20 SE2 |
|---|---|---|---|
| PFOA | 4 ppt | 4.6 | < 4 |
| 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 |
| PFBS | 3 ppt | < 3 | < 3 |
| 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 |
| PFHxS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOS | 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 | 11.2 | 12 |
Well W-9 facility 91817 · sample point 1910240817 · groundwater
| Compound | MRL | 2023-06-21 SE1 |
|---|---|---|
| PFBA | 5 ppt | 7.2 |
| PFBS | 3 ppt | 6.8 |
| PFHpA | 3 ppt | 4.1 |
| PFHxA | 3 ppt | 7.5 |
| PFOA | 4 ppt | 10.9 |
| PFPeA | 3 ppt | 6.8 |
| 11Cl-PF3OUdS | 5 ppt | < 5 |
| 4:2 FTS | 3 ppt | < 3 |
| 6:2 FTS | 5 ppt | < 5 |
| 8:2 FTS | 5 ppt | < 5 |
| 9Cl-PF3ONS | 2 ppt | < 2 |
| ADONA | 3 ppt | < 3 |
| HFPO-DA | 5 ppt | < 5 |
| NEtFOSAA | 5 ppt | < 5 |
| NFDHA | 20 ppt | < 20 |
| NMeFOSAA | 6 ppt | < 6 |
| PFDA | 3 ppt | < 3 |
| PFDoA | 3 ppt | < 3 |
| PFEESA | 3 ppt | < 3 |
| PFHpS | 3 ppt | < 3 |
| PFHxS | 3 ppt | < 3 |
| PFMBA | 3 ppt | < 3 |
| PFMPA | 4 ppt | < 4 |
| PFNA | 4 ppt | < 4 |
| PFOS | 4 ppt | < 4 |
| PFPeS | 4 ppt | < 4 |
| PFTA | 8 ppt | < 8 |
| PFTrDA | 7 ppt | < 7 |
| PFUnA | 2 ppt | < 2 |
| lithium | 9 µg/L | < 9 |
Wells 206 & 207 facility 91830 · sample point 1910240830 · groundwater
| Compound | MRL | 2023-06-07 SE1 | 2023-12-27 SE2 | 2024-08-21 SE1 |
|---|---|---|---|---|
| PFBA | 5 ppt | 5.5 | < 5 | – |
| PFBS | 3 ppt | 5.9 | < 3 | – |
| PFHxA | 3 ppt | 9.1 | < 3 | – |
| PFHxS | 3 ppt | 3.9 | 3.2 | – |
| PFOA | 4 ppt | 6.3 | < 4 | – |
| PFOS | 4 ppt | 4.3 | < 4 | – |
| PFPeA | 3 ppt | 8 | < 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 | – |
| PFHpA | 3 ppt | < 3 | < 3 | – |
| PFHpS | 3 ppt | < 3 | < 3 | – |
| PFMBA | 3 ppt | < 3 | < 3 | – |
| PFMPA | 4 ppt | < 4 | < 4 | – |
| PFNA | 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 | 24.3 | 22.4 | – |
Wells N, N7 & N8 facility 91829 · sample point 1910240829 · groundwater
| Compound | MRL | 2023-06-21 SE1 | 2023-12-06 SE2 | 2024-01-03 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 13.3 | – | 6.7 |
| PFHxA | 3 ppt | 14.2 | – | 6.6 |
| PFPeA | 3 ppt | 22.6 | – | 10.1 |
| 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 | – |
| PFBS | 3 ppt | < 3 | – | < 3 |
| 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 |
| PFHxS | 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 |
|---|---|---|---|---|---|---|---|---|
| lithium | 18 | 83% | 53.1 2023-06-07 | 21.85–23.35 | 12.3 | 39.6 | 47.7 | 53.1 |
| PFBA | 18 | 50% | 13.3 2023-06-21 | 3.56–6.06 | <MRL | 5.9 | 8.9 | 13.3 |
| PFPeA | 18 | 50% | 22.6 2023-06-21 | 4.63–6.13 | <MRL | 8 | 11.1 | 22.6 |
| PFHxA | 18 | 44% | 14.2 2023-06-21 | 3.37–5.04 | <MRL | 6.6 | 9.1 | 14.2 |
| PFOA | 18 | 39% | 16.9 2023-12-06 | 4.15–6.59 | <MRL | 10.6 | 14.4 | 16.9 |
| PFBS | 18 | 33% | 6.9 2023-06-07 | 2.03–4.03 | <MRL | 5.6 | 6.9 | 6.9 |
| PFHxS | 18 | 33% | 7.6 2023-12-06 | 1.89–3.89 | <MRL | 3.9 | 7.1 | 7.6 |
| PFHpA | 18 | 28% | 6.3 2023-12-06 | 1.26–3.43 | <MRL | 3.7 | 4.7 | 6.3 |
| PFOS | 18 | 28% | 7.5 2023-12-06 | 1.59–4.48 | <MRL | 4.3 | 6.4 | 7.5 |
Never detected (21): 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, 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 2023-01-09 to 2026-06-17; 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 90f0922cd84f · 2026-10-18T04:12Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.