- PWSID
- FL4130604
- State
- Florida
- System type
- community water system (CWS)
- Population served
- 238,000
- City
- Hialeah
- Counties
- Miami-Dade County
- Primary source water
- groundwater
- UCMR 5 sampling
- 2023-07-26 to 2024-08-20 · 3 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.
Water purchased from
- Mdwasa - Main System (FL4130871)
Seller's highest results: PFOA 14 ppt · PFOS 33 ppt · HI 1.592 · detected: 6:2 FTS;8:2 FTS;PFBA;PFBS;PFHpA;PFHxA;PFHxS;PFNA;PFOA;PFOS;PFPeA
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) | 10.2 | 9 | 4 |
| PFOS (ppt) | 27.6 | 25.55 | 4 |
| Hazard Index | 1.083 | 0.822 | 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 2023-07-26 to 2024-08-20 · 3 entry point(s) · water types: GW · 9 sampling visits. PFAS in ppt (ng/L).
| Date | Entry point | Event | PFOA | PFOS | HI | Other detections |
|---|---|---|---|---|---|---|
| 2023-07-26 | COH RO WTP (GW) | SE1 | <4 | <4 | 0 | none |
| 2023-07-26 | Miami Dade (Hialeah TP) (GW) | SE1 | 7.8 | 23.5 | 0.562 | 6:2 FTS 62.6, PFBA 19.1, PFHpA 14, PFHxA 29.7, PFPeA 30.6 |
| 2023-07-26 | Miami Dade (Preston TP) (GW) | SE1 | <4 | 13.6 | 0.002 | PFBA 11.1, PFHxA 5.7, PFPeA 5.9 |
| 2024-01-17 | COH RO WTP (GW) | SE2 | n/a | n/a | n/a | lithium 59 µg/L |
| 2024-01-17 | Miami Dade (Hialeah TP) (GW) | SE2 | n/a | n/a | n/a | none |
| 2024-01-17 | Miami Dade (Preston TP) (GW) | SE2 | <4 | 13.4 | 0.002 | PFBA 9.3, PFHxA 6, PFPeA 7.3 |
| 2024-02-14 | COH RO WTP (GW) | SE2 | n/a | n/a | n/a | none |
| 2024-04-16 | COH RO WTP (GW) | SE2 | <4 | <4 | 0 | none |
| 2024-08-20 | Miami Dade (Hialeah TP) (GW) | SE2 | 10.2 | 27.6 | 1.083 | 6:2 FTS 91.1, 8:2 FTS 5.5, PFBA 17, PFHpA 14.7, PFHxA 35.2, PFPeA 36.9 |
“<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
180 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.
COH RO WTP facility 00003 · sample point 0604003 · groundwater
| Compound | MRL | 2023-07-26 SE1 | 2024-01-17 SE2 | 2024-02-14 SE2 | 2024-04-16 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 | 59 | – | – |
Miami Dade (Hialeah TP) facility 00001 · sample point POE1 · groundwater
| Compound | MRL | 2023-07-26 SE1 | 2024-01-17 SE2 | 2024-08-20 SE2 |
|---|---|---|---|---|
| 6:2 FTS | 5 ppt | 62.6 | – | 91.1 |
| 8:2 FTS | 5 ppt | < 5 | – | 5.5 |
| PFBA | 5 ppt | 19.1 | – | 17 |
| PFBS | 3 ppt | 4.4 | – | 5.1 |
| PFHpA | 3 ppt | 14 | – | 14.7 |
| PFHxA | 3 ppt | 29.7 | – | 35.2 |
| PFHxS | 3 ppt | 5.6 | – | 6.5 |
| PFNA | 4 ppt | < 4 | – | 4.3 |
| PFOA | 4 ppt | 7.8 | – | 10.2 |
| PFOS | 4 ppt | 23.5 | – | 27.6 |
| PFPeA | 3 ppt | 30.6 | – | 36.9 |
| 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 | – |
Miami Dade (Preston TP) facility 00002 · sample point POE2 · groundwater
| Compound | MRL | 2023-07-26 SE1 | 2024-01-17 SE2 |
|---|---|---|---|
| PFBA | 5 ppt | 11.1 | 9.3 |
| PFBS | 3 ppt | 3.5 | 3.3 |
| PFHxA | 3 ppt | 5.7 | 6 |
| PFOS | 4 ppt | 13.6 | 13.4 |
| PFPeA | 3 ppt | 5.9 | 7.3 |
| 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 |
| 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 |
| 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 | 6 | 67% | 19.1 2023-07-26 | 9.42–11.08 | 9.3 | 17 | 19.1 | 19.1 |
| PFBS | 6 | 67% | 5.1 2024-08-20 | 2.72–3.72 | 3.3 | 4.4 | 5.1 | 5.1 |
| PFHxA | 6 | 67% | 35.2 2024-08-20 | 12.77–13.77 | 5.7 | 29.7 | 35.2 | 35.2 |
| PFOS | 6 | 67% | 27.6 2024-08-20 | 13.02–14.35 | 13.4 | 23.5 | 27.6 | 27.6 |
| PFPeA | 6 | 67% | 36.9 2024-08-20 | 13.45–14.45 | 5.9 | 30.6 | 36.9 | 36.9 |
| 6:2 FTS | 6 | 33% | 91.1 2024-08-20 | 25.62–28.95 | <MRL | 62.6 | 91.1 | 91.1 |
| PFHpA | 6 | 33% | 14.7 2024-08-20 | 4.78–6.78 | <MRL | 14 | 14.7 | 14.7 |
| PFHxS | 6 | 33% | 6.5 2024-08-20 | 2.02–4.02 | <MRL | 5.6 | 6.5 | 6.5 |
| PFOA | 6 | 33% | 10.2 2024-08-20 | 3–5.67 | <MRL | 7.8 | 10.2 | 10.2 |
| 8:2 FTS | 6 | 17% | 5.5 2024-08-20 | 0.92–5.08 | <MRL | <MRL | 5.5 | 5.5 |
| PFNA | 6 | 17% | 4.3 2024-08-20 | 0.72–4.05 | <MRL | <MRL | 4.3 | 4.3 |
| lithium | 6 | 17% | 59 2024-01-17 | 9.83–17.33 | <MRL | <MRL | 59 | 59 |
Never detected (18): 11Cl-PF3OUdS, 4:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, PFMBA, PFMPA, 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 2023-01-03 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.