- PWSID
- CA3610062
- State
- California
- System type
- community water system (CWS)
- Population served
- 5,268
- City
- Running Springs
- Counties
- San Bernardino County
- Primary source water
- surface water (purchased)
- UCMR 5 sampling
- 2025-01-06 to 2026-03-17 · 10 entry point(s) · water types: GW;MX
- Service-area boundary
- authoritative
PFOS ≥ 3 × its limit highest single result
PFOS ≥ 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.
Water purchased from
- Arrowbear Park Cwd (CA3610110)
Seller not monitored under UCMR 5. - Clawa (CA3610114)
Seller not monitored under UCMR 5.
Seller results are the seller's own entry-point samples, not measurements of this system's water. This system's own samples (below) may reflect purchased water, its own sources, or both.
Compared with EPA's 2024 values
| Highest single result | Worst entry-point average* | Limit | |
|---|---|---|---|
| PFOA (ppt) | 15.9 | 11.7 | 4 |
| PFOS (ppt) | 236.5 | 131 | 4 |
| Hazard Index | 9.556 | 6.859 | 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) | 95.5 | 68.55 | 3 (guidance) |
| PFOA (ppt) | 15.9 | 11.7 | 4 (guidance) |
| PFOS (ppt) | 236.5 | 131 | 4 (guidance) |
| PFBS (ppt) | 11.7 | 8.55 | 500 (guidance) |
| PFHxA (ppt) | 19 | 13.5 | 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 2025-01-06 to 2026-03-17 · 10 entry point(s) · water types: GW;MX · 22 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2025-01-06 | Ayers Well 2 U IX EFF (GW) | SE1 | <4 | <4 | 0 | lithium 29.6 µg/L |
| 2025-01-06 | Harris Vertical Well (GW) | SE1 | 8.3 | 4.8 | 0.322 | PFHpA 3.5, PFHxA 3.8, PFPeA 5.2, lithium 31.9 µg/L |
| 2025-01-06 | Owl Rock Vertical Well (GW) | SE1 | <4 | <4 | 0 | lithium 14.2 µg/L |
| 2025-01-06 | Purchased - Arrowbear CWD (GW) | SE1 | <4 | <4 | 0 | lithium 101 µg/L |
| 2025-01-06 | Purchased - CLAWA (MX) | SE1 | <4 | <4 | 0 | none |
| 2025-01-07 | District Complex Vertical Well (GW) | SE1 | 7.5 | 25.5 | 4.163 | PFHpA 6.1, PFHxA 8, PFPeA 6.5, PFPeS 4.8, lithium 37.3 µg/L |
| 2025-01-07 | Luring Canyon Vertical Well - Treated EFF (GW) | SE1 | <4 | 11.7 | 0.66 | PFHxA 3.1, PFPeA 3.9, lithium 29.5 µg/L |
| 2025-01-07 | Luring Pines Well Uranium IX EFF (GW) | SE1 | <4 | <4 | 0 | lithium 37.7 µg/L |
| 2025-01-07 | Sidewinder Canyon Entry Point (GW) | SE1 | <4 | <4 | 0.39 | PFHxA 4, PFPeA 5.5, lithium 21.6 µg/L |
| 2025-03-25 | Rimwood Vertical 2 Well Treated Soda/IX (GW) | SE1 | <4 | <4 | 0 | lithium 54.1 µg/L |
| 2025-04-21 | Purchased - CLAWA (MX) | SE2 | <4 | <4 | 0 | none |
| 2025-07-15 | Luring Canyon Vertical Well - Treated EFF (GW) | SE2 | <4 | 12.7 | 0.64 | lithium 29.9 µg/L |
| 2025-07-15 | Luring Pines Well Uranium IX EFF (GW) | SE2 | <4 | <4 | 0 | lithium 37.6 µg/L |
| 2025-07-15 | Purchased - Arrowbear CWD (GW) | SE2 | <4 | <4 | 0 | lithium 106 µg/L |
| 2025-07-15 | Purchased - CLAWA (MX) | SE3 | <4 | <4 | 0 | none |
| 2025-07-15 | Rimwood Vertical 2 Well Treated Soda/IX (GW) | SE2 | <4 | <4 | 0 | lithium 66.3 µg/L |
| 2025-07-29 | District Complex Vertical Well (GW) | SE2 | 15.9 | 236.5 | 9.556 | PFBA 5.6, PFHpA 12.8, PFHpS 5.5, PFHxA 19, PFPeA 14.4, PFPeS 10.8, lithium 40.8 µg/L |
| 2025-07-29 | Harris Vertical Well (GW) | SE2 | 9 | 4.6 | 0.392 | PFHpA 4.2, PFHxA 5, PFPeA 5.9, lithium 33.1 µg/L |
| 2025-07-29 | Owl Rock Vertical Well (GW) | SE2 | <4 | <4 | 0 | lithium 13.6 µg/L |
| 2025-07-29 | Sidewinder Canyon Entry Point (GW) | SE2 | <4 | <4 | 0.42 | PFHxA 4.5, PFPeA 5.9, lithium 20.9 µg/L |
| 2025-10-27 | Purchased - CLAWA (MX) | SE4 | <4 | <4 | 0 | none |
| 2026-03-17 | Ayers Well 2 U IX EFF (GW) | SE2 | <4 | <4 | 0 | PFHxA 3, PFPeA 4.4, lithium 29.2 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
660 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.
Ayers Well 2 U IX EFF facility 051051 · sample point GWSS051 · groundwater
| Compound | MRL | 2025-01-06 SE1 | 2026-03-17 SE2 |
|---|---|---|---|
| PFHxA | 3 ppt | < 3 | 3 |
| PFPeA | 3 ppt | < 3 | 4.4 |
| 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 |
| 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 | 29.6 | 29.2 |
District Complex Vertical Well facility 101101 · sample point GWSS101 · groundwater
| Compound | MRL | 2025-01-07 SE1 | 2025-07-29 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | < 5 | 5.6 |
| PFBS | 3 ppt | 5.4 | 11.7 |
| PFHpA | 3 ppt | 6.1 | 12.8 |
| PFHpS | 3 ppt | < 3 | 5.5 |
| PFHxA | 3 ppt | 8 | 19 |
| PFHxS | 3 ppt | 41.6 | 95.5 |
| PFOA | 4 ppt | 7.5 | 15.9 |
| PFOS | 4 ppt | 25.5 | 236.5 |
| PFPeA | 3 ppt | 6.5 | 14.4 |
| PFPeS | 4 ppt | 4.8 | 10.8 |
| 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 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFTA | 8 ppt | < 8 | < 8 |
| PFTrDA | 7 ppt | < 7 | < 7 |
| PFUnA | 2 ppt | < 2 | < 2 |
| lithium | 9 µg/L | 37.3 | 40.8 |
Harris Vertical Well facility 105105 · sample point GWSS105 · groundwater
| Compound | MRL | 2025-01-06 SE1 | 2025-07-29 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 3.7 | 4.3 |
| PFHpA | 3 ppt | 3.5 | 4.2 |
| PFHxA | 3 ppt | 3.8 | 5 |
| PFHxS | 3 ppt | 3.2 | 3.9 |
| PFOA | 4 ppt | 8.3 | 9 |
| PFOS | 4 ppt | 4.8 | 4.6 |
| PFPeA | 3 ppt | 5.2 | 5.9 |
| 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 |
| 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 | 31.9 | 33.1 |
Luring Canyon Vertical Well - Treated EFF facility 102102 · sample point GWSS102 · groundwater
| Compound | MRL | 2025-01-07 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| PFHxA | 3 ppt | 3.1 | < 3 |
| PFHxS | 3 ppt | 6.6 | 6.4 |
| PFOS | 4 ppt | 11.7 | 12.7 |
| PFPeA | 3 ppt | 3.9 | < 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 |
| 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 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 4 ppt | < 4 | < 4 |
| PFNA | 4 ppt | < 4 | < 4 |
| PFOA | 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 | 29.5 | 29.9 |
Luring Pines Well Uranium IX EFF facility 049049 · sample point GWSS049 · groundwater
| Compound | MRL | 2025-01-07 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| 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 | 37.7 | 37.6 |
Owl Rock Vertical Well facility 031031 · sample point GWSS031 · groundwater
| Compound | MRL | 2025-01-06 SE1 | 2025-07-29 SE2 |
|---|---|---|---|
| 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 | 14.2 | 13.6 |
Purchased - Arrowbear CWD facility 045045 · sample point GWCC045 · groundwater
| Compound | MRL | 2025-01-06 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| 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 | 101 | 106 |
Purchased - CLAWA facility 046046 · sample point MXCC046 · MX
| Compound | MRL | 2025-01-06 SE1 | 2025-04-21 SE2 | 2025-07-15 SE3 | 2025-10-27 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 | < 9 | < 9 | < 9 | < 9 |
Rimwood Vertical 2 Well Treated Soda/IX facility 048048 · sample point GWSS048 · groundwater
| Compound | MRL | 2025-03-25 SE1 | 2025-07-15 SE2 |
|---|---|---|---|
| 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 | 54.1 | 66.3 |
Sidewinder Canyon Entry Point facility 044044 · sample point GWSS044 · groundwater
| Compound | MRL | 2025-01-07 SE1 | 2025-07-29 SE2 |
|---|---|---|---|
| PFHxA | 3 ppt | 4 | 4.5 |
| PFHxS | 3 ppt | 3.9 | 4.2 |
| PFPeA | 3 ppt | 5.5 | 5.9 |
| 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 |
| 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 |
| 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 | 21.6 | 20.9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| lithium | 22 | 82% | 106 2025-07-15 | 33.38–35.01 | 29.6 | 37.7 | 66.3 | 101 |
| PFHxA | 22 | 36% | 19 2025-07-29 | 2.29–4.2 | <MRL | 3.8 | 5 | 8 |
| PFHxS | 22 | 36% | 95.5 2025-07-29 | 7.51–9.42 | <MRL | 3.9 | 6.6 | 41.6 |
| PFPeA | 22 | 36% | 14.4 2025-07-29 | 2.35–4.26 | <MRL | 5.2 | 5.9 | 6.5 |
| PFOS | 22 | 27% | 236.5 2025-07-29 | 13.45–16.35 | <MRL | 4.6 | 12.7 | 25.5 |
| PFBS | 22 | 18% | 11.7 2025-07-29 | 1.14–3.6 | <MRL | <MRL | 4.3 | 5.4 |
| PFHpA | 22 | 18% | 12.8 2025-07-29 | 1.21–3.66 | <MRL | <MRL | 4.2 | 6.1 |
| PFOA | 22 | 18% | 15.9 2025-07-29 | 1.85–5.12 | <MRL | <MRL | 8.3 | 9 |
| PFPeS | 22 | 9% | 10.8 2025-07-29 | 0.71–4.35 | <MRL | <MRL | <MRL | 4.8 |
| PFBA | 22 | 4% | 5.6 2025-07-29 | 0.25–5.03 | <MRL | <MRL | <MRL | <MRL |
| PFHpS | 22 | 4% | 5.5 2025-07-29 | 0.25–3.11 | <MRL | <MRL | <MRL | <MRL |
Never detected (19): 11Cl-PF3OUdS, 4:2 FTS, 6:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFMBA, PFMPA, PFNA, 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.