- PWSID
- PR0004604
- State
- Puerto Rico
- System type
- community water system (CWS)
- Population served
- 6,445
- City
- Juana Diaz
- Counties
- Juana Díaz Municipio
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-04-03 to 2024-08-20 · 5 entry point(s) · water types: GW
- Service-area boundary
- not available in EPA dataset
PFOA ≥ 3 × its limit highest single result
PFOA ≥ 3 × its limit worst entry-point average
Open on the Puerto Rico map · All Puerto Rico 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) | 22 | 17.45 | 4 |
| PFOS (ppt) | 5.4 | 5.35 | 4 |
| Hazard Index | 0.021 | 0.012 | 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 Puerto Rico PFAS drinking-water standard in effect or proposed as of 2026-10-17: No Puerto Rico-specific PFAS drinking-water standard identified (federal NPDWR applies).
Sampling history
Sampled 2023-04-03 to 2024-08-20 · 5 entry point(s) · water types: GW · 14 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-04-03 | EXPERIMENTAL (GW) | SE1 | <4 | 5.3 | 0.002 | none |
| 2023-04-03 | EXPERIMENTAL (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-04-04 | EXPERIMENTAL (GW) | SE1 | <4 | <4 | 0 | PFBA 8 |
| 2023-04-05 | EXPERIMENTAL (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-05-17 | EXPERIMENTAL (GW) | SE1 | <4 | <4 | 0.002 | none |
| 2023-10-17 | EXPERIMENTAL (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-10-18 | EXPERIMENTAL (GW) | SE2 | <4 | 4.5 | 0.002 | none |
| 2023-10-18 | EXPERIMENTAL (GW) | SE2 | <4 | 5.4 | 0.002 | none |
| 2023-11-06 | EXPERIMENTAL (GW) | SE2 | <4 | 5.2 | 0.002 | none |
| 2023-11-14 | EXPERIMENTAL (GW) | SE2 | n/a | n/a | n/a | none |
| 2023-12-20 | EXPERIMENTAL (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-02-29 | EXPERIMENTAL (GW) | SE1 | n/a | n/a | 0 | none |
| 2024-07-10 | EXPERIMENTAL (GW) | SE1 | 12.9 | 4.1 | 0.015 | PFBA 38.4, PFHpA 8.3, PFHxA 153.4, PFPeA 71.6 |
| 2024-08-20 | EXPERIMENTAL (GW) | SE2 | 22 | 4.7 | 0.021 | PFBA 54, PFHpA 13, PFHxA 260, PFPeA 110 |
“<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
300 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.
EXPERIMENTAL facility 00001 · sample point 46040000 · groundwater
| Compound | MRL | 2023-04-05 SE1 | 2023-05-17 SE1 | 2023-10-18 SE2 |
|---|---|---|---|---|
| PFBS | 3 ppt | – | 3.5 | 4.1 |
| PFOS | 4 ppt | – | < 4 | 4.5 |
| 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 |
| 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 |
| 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 |
EXPERIMENTAL facility 00001 · sample point 46040001 · groundwater
| Compound | MRL | 2023-04-03 SE1 | 2023-10-18 SE2 |
|---|---|---|---|
| PFBS | 3 ppt | 4.9 | 4.6 |
| PFOS | 4 ppt | 5.3 | 5.4 |
| 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 |
| 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 |
| 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 |
EXPERIMENTAL facility 00001 · sample point 46040310 · groundwater
| Compound | MRL | 2024-02-29 SE1 | 2024-07-10 SE1 | 2024-08-20 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 38.4 | 54 |
| PFBS | 3 ppt | – | 30.1 | 42 |
| PFHpA | 3 ppt | – | 8.3 | 13 |
| PFHxA | 3 ppt | – | 153.4 | 260 |
| PFOA | 4 ppt | – | 12.9 | 22 |
| PFOS | 4 ppt | – | 4.1 | 4.7 |
| PFPeA | 3 ppt | – | 71.6 | 110 |
| 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 |
| PFHxS | 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 | < 9 | – | < 9 |
EXPERIMENTAL facility 00001 · sample point 46040312 · groundwater
| Compound | MRL | 2023-04-03 SE1 | 2023-10-17 SE2 | 2023-11-06 SE2 |
|---|---|---|---|---|
| PFBS | 3 ppt | < 3 | – | 3.2 |
| PFOS | 4 ppt | < 4 | – | 5.2 |
| 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 |
| 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 |
| 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 | – |
EXPERIMENTAL facility 00001 · sample point 46040353 · groundwater
| Compound | MRL | 2023-04-04 SE1 | 2023-11-14 SE2 | 2023-12-20 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | 8 | – | < 5 |
| 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 |
| 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 | < 9 | < 9 | – |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBS | 10 | 70% | 42 2024-08-20 | 9.24–10.14 | 3.5 | 4.9 | 30.1 | 42 |
| PFOS | 10 | 60% | 5.4 2023-10-18 | 2.92–4.52 | 4.1 | 5.2 | 5.3 | 5.4 |
| PFBA | 10 | 30% | 54 2024-08-20 | 10.04–13.54 | <MRL | 8 | 38.4 | 54 |
| PFHpA | 10 | 20% | 13 2024-08-20 | 2.13–4.53 | <MRL | <MRL | 8.3 | 13 |
| PFHxA | 10 | 20% | 260 2024-08-20 | 41.34–43.74 | <MRL | <MRL | 153.4 | 260 |
| PFOA | 10 | 20% | 22 2024-08-20 | 3.49–6.69 | <MRL | <MRL | 12.9 | 22 |
| PFPeA | 10 | 20% | 110 2024-08-20 | 18.16–20.56 | <MRL | <MRL | 71.6 | 110 |
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, PFHxS, PFMBA, PFMPA, PFNA, 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 2023-01-10 to 2026-01-12; 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 9c1cfa699a74 · 2026-10-18T04:05Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.