- PWSID
- CA3700963
- State
- California
- System type
- non-transient non-community water system (NTNCWS)
- Population served
- 300
- City
- Pine Valley
- Counties
- San Diego County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2024-05-15 to 2024-11-19 · 1 entry point(s) · water types: GW
- Service-area boundary
- parcel-based (EPA non-community layer)
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) | 188.3 | 181.4 | 4 |
| PFOS (ppt) | 64.2 | 57.15 | 4 |
| Hazard Index | 26.043 | 23.128 | 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) | 250.2 | 221.95 | 3 (guidance) |
| PFOA (ppt) | 188.3 | 181.4 | 4 (guidance) |
| PFOS (ppt) | 64.2 | 57.15 | 4 (guidance) |
| PFBS (ppt) | 5.9 | 5.25 | 500 (guidance) |
| PFHxA (ppt) | 95.2 | 77.15 | 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 2024-05-15 to 2024-11-19 · 1 entry point(s) · water types: GW · 2 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2024-05-15 | Sampling Station (GW) | SE1 | 188.3 | 50.1 | 26.043 | PFBA 13.1, PFHpA 72.7, PFHxA 95.2, PFPeA 62 |
| 2024-11-19 | Sampling Station (GW) | SE2 | 174.5 | 64.2 | 20.212 | PFBA 9.6, PFHpA 48, PFHxA 59.1, PFPeA 35.8 |
“<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
60 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.
Sampling Station facility 20001 · sample point EP001 · groundwater
| Compound | MRL | 2024-05-15 SE1 | 2024-11-19 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 13.1 | 9.6 |
| PFBS | 3 ppt | 5.9 | 4.6 |
| PFHpA | 3 ppt | 72.7 | 48 |
| PFHxA | 3 ppt | 95.2 | 59.1 |
| PFHxS | 3 ppt | 250.2 | 193.7 |
| PFNA | 4 ppt | 10.2 | 8.4 |
| PFOA | 4 ppt | 188.3 | 174.5 |
| PFOS | 4 ppt | 50.1 | 64.2 |
| PFPeA | 3 ppt | 62 | 35.8 |
| 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 |
| PFHpS | 3 ppt | < 3 | < 3 |
| PFMBA | 3 ppt | < 3 | < 3 |
| PFMPA | 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 |
|---|---|---|---|---|---|---|---|---|
| PFBA | 2 | 100% | 13.1 2024-05-15 | 11.35–11.35 | fewer than 4 results: raw values only | |||
| PFBS | 2 | 100% | 5.9 2024-05-15 | 5.25–5.25 | fewer than 4 results: raw values only | |||
| PFHpA | 2 | 100% | 72.7 2024-05-15 | 60.35–60.35 | fewer than 4 results: raw values only | |||
| PFHxA | 2 | 100% | 95.2 2024-05-15 | 77.15–77.15 | fewer than 4 results: raw values only | |||
| PFHxS | 2 | 100% | 250.2 2024-05-15 | 221.95–221.95 | fewer than 4 results: raw values only | |||
| PFNA | 2 | 100% | 10.2 2024-05-15 | 9.3–9.3 | fewer than 4 results: raw values only | |||
| PFOA | 2 | 100% | 188.3 2024-05-15 | 181.4–181.4 | fewer than 4 results: raw values only | |||
| PFOS | 2 | 100% | 64.2 2024-11-19 | 57.15–57.15 | fewer than 4 results: raw values only | |||
| PFPeA | 2 | 100% | 62 2024-05-15 | 48.9–48.9 | fewer than 4 results: raw values only | |||
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, 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 2026-06-17; 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.