- PWSID
- FL4130871
- State
- Florida
- System type
- community water system (CWS)
- Population served
- 2,377,460
- City
- Miami
- Counties
- Miami-Dade County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-11-08 to 2024-05-15 · 4 entry point(s) · water types: GW
- Service-area boundary
- authoritative
PFOS ≥ 3 × its limit highest single result
PFOS ≥ 3 × its limit worst entry-point average
Open on the Florida map · All Florida 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) | 14 | 12.35 | 4 |
| PFOS (ppt) | 33 | 31.45 | 4 |
| Hazard Index | 1.592 | 1.442 | 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 Florida PFAS drinking-water standard in effect or proposed as of 2026-10-17: No state PFAS drinking-water MCL. Ch. 2022-203 Laws of Fla. (s. 376.91) concerns contaminated-site cleanup target levels, not drinking water.
Sampling history
Sampled 2023-11-08 to 2024-05-15 · 4 entry point(s) · water types: GW · 12 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-11-08 | Alexander Orr WTP (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-11-08 | Hialeah RO PLant (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-11-08 | Hialeah WTP (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-11-08 | Preston WTP (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-12-20 | Alexander Orr WTP (GW) | SE1 | 4.9 | 12 | 0.002 | PFBA 9.3, PFHpA 3.3, PFHxA 6.9, PFPeA 11 |
| 2023-12-20 | Hialeah RO PLant (GW) | SE1 | n/a | n/a | n/a | none |
| 2023-12-20 | Hialeah WTP (GW) | SE1 | 14 | 33 | 1.592 | 6:2 FTS 190, 8:2 FTS 8.2, PFBA 22, PFHpA 20, PFHxA 58, PFPeA 56 |
| 2023-12-20 | Preston WTP (GW) | SE1 | 4.4 | 12 | 0.002 | PFBA 8.5, PFHxA 5.6, PFPeA 8.2 |
| 2024-05-15 | Alexander Orr WTP (GW) | SE2 | 4.4 | 11 | 0.002 | PFBA 11, PFHpA 3.7, PFHxA 7.2, PFPeA 11 |
| 2024-05-15 | Hialeah RO PLant (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-05-15 | Hialeah WTP (GW) | SE2 | 10.7 | 29.9 | 1.292 | 6:2 FTS 128.9, 8:2 FTS 9.6, PFBA 19, PFHpA 19.7, PFHxA 53.2, PFPeA 43.9 |
| 2024-05-15 | Preston WTP (GW) | SE2 | 4.8 | 16 | 0.302 | 6:2 FTS 7.9, PFBA 12, PFHpA 4, PFHxA 8, PFPeA 10 |
“<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.
Alexander Orr WTP facility 00001 · sample point 0871001 · groundwater
| Compound | MRL | 2023-11-08 SE1 | 2023-12-20 SE1 | 2024-05-15 SE2 |
|---|---|---|---|---|
| PFBA | 5 ppt | – | 9.3 | 11 |
| PFBS | 3 ppt | – | 4.1 | 4.6 |
| PFHpA | 3 ppt | – | 3.3 | 3.7 |
| PFHxA | 3 ppt | – | 6.9 | 7.2 |
| PFOA | 4 ppt | – | 4.9 | 4.4 |
| PFOS | 4 ppt | – | 12 | 11 |
| PFPeA | 3 ppt | – | 11 | 11 |
| 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 |
Hialeah RO PLant facility 00004 · sample point 0871004 · groundwater
| Compound | MRL | 2023-11-08 SE1 | 2023-12-20 SE1 | 2024-05-15 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 | < 9 | – | < 9 |
Hialeah WTP facility 00003 · sample point 0871003 · groundwater
| Compound | MRL | 2023-11-08 SE1 | 2023-12-20 SE1 | 2024-05-15 SE2 |
|---|---|---|---|---|
| 6:2 FTS | 5 ppt | – | 190 | 128.9 |
| 8:2 FTS | 5 ppt | – | 8.2 | 9.6 |
| PFBA | 5 ppt | – | 22 | 19 |
| PFBS | 3 ppt | – | 4.5 | 4.3 |
| PFHpA | 3 ppt | – | 20 | 19.7 |
| PFHxA | 3 ppt | – | 58 | 53.2 |
| PFHxS | 3 ppt | – | 9.4 | 8.2 |
| PFNA | 4 ppt | – | 6.5 | 4.7 |
| PFOA | 4 ppt | – | 14 | 10.7 |
| PFOS | 4 ppt | – | 33 | 29.9 |
| PFPeA | 3 ppt | – | 56 | 43.9 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 |
| 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 |
Preston WTP facility 00002 · sample point 0871002 · groundwater
| Compound | MRL | 2023-11-08 SE1 | 2023-12-20 SE1 | 2024-05-15 SE2 |
|---|---|---|---|---|
| 6:2 FTS | 5 ppt | – | < 5 | 7.9 |
| PFBA | 5 ppt | – | 8.5 | 12 |
| PFBS | 3 ppt | – | 3.2 | 4 |
| PFHpA | 3 ppt | – | < 3 | 4 |
| PFHxA | 3 ppt | – | 5.6 | 8 |
| PFHxS | 3 ppt | – | < 3 | 3 |
| PFOA | 4 ppt | – | 4.4 | 4.8 |
| PFOS | 4 ppt | – | 12 | 16 |
| PFPeA | 3 ppt | – | 8.2 | 10 |
| 11Cl-PF3OUdS | 5 ppt | – | < 5 | < 5 |
| 4:2 FTS | 3 ppt | – | < 3 | < 3 |
| 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 | < 9 | – | < 9 |
Statistics by compound
| Compound | Results | Detected | Highest (date) | Mean bounds | KM median | P75 | P90 | P95 |
|---|---|---|---|---|---|---|---|---|
| PFBA | 8 | 75% | 22 2023-12-20 | 10.22–11.47 | 9.3 | 12 | 22 | 22 |
| PFBS | 8 | 75% | 4.6 2024-05-15 | 3.09–3.84 | 4 | 4.3 | 4.6 | 4.6 |
| PFHxA | 8 | 75% | 58 2023-12-20 | 17.36–18.11 | 6.9 | 8 | 58 | 58 |
| PFOA | 8 | 75% | 14 2023-12-20 | 5.4–6.4 | 4.4 | 4.9 | 14 | 14 |
| PFOS | 8 | 75% | 33 2023-12-20 | 14.24–15.24 | 12 | 16 | 33 | 33 |
| PFPeA | 8 | 75% | 56 2023-12-20 | 17.51–18.26 | 10 | 11 | 56 | 56 |
| PFHpA | 8 | 62% | 20 2023-12-20 | 6.34–7.46 | 3.3 | 4 | 20 | 20 |
| 6:2 FTS | 8 | 38% | 190 2023-12-20 | 40.85–43.98 | <MRL | 7.9 | 190 | 190 |
| PFHxS | 8 | 38% | 9.4 2023-12-20 | 2.58–4.45 | <MRL | 3 | 9.4 | 9.4 |
| 8:2 FTS | 8 | 25% | 9.6 2024-05-15 | 2.23–5.97 | <MRL | <MRL | 9.6 | 9.6 |
| PFNA | 8 | 25% | 6.5 2023-12-20 | 1.4–4.4 | <MRL | <MRL | 6.5 | 6.5 |
Never detected (19): 11Cl-PF3OUdS, 4:2 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 2023-01-03 to 2026-06-09; 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 77d99d3b80c8 · 2026-10-18T04:10Z · UCMR 5 release Jul2026 · SDWIS 2026Q3. Data and methods.