PROJECT ABACUSENVIRONMENTAL DATA

Surfside, Town Of

PFAS monitoring results for a public water system in Florida

FL4131424UCMR 5EPA monitoring data
4.7Highest PFOA result, ppt
14.8Highest PFOS result, ppt
0.312Highest Hazard Index
60Results
PWSID
FL4131424
State
Florida
System type
community water system (CWS)
Population served
5,744
City
Surfside
Counties
Miami-Dade County
Primary source water
groundwater (purchased)
UCMR 5 sampling
2025-01-08 to 2025-07-08 · 1 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 resultWorst entry-point average*Limit
PFOA (ppt)4.72.354
PFOS (ppt)14.814.054
Hazard Index0.3120.1571.0†

“<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 2025-01-08 to 2025-07-08 · 1 entry point(s) · water types: GW · 2 sampling visits. PFAS in ppt (ng/L).

DateEntry pointEventPFOAPFOSHIOther detections
2025-01-0888th St & Byron Ave (GW)SE1<413.30.0026:2 FTS 8.1, PFBA 10.3, PFHpA 3.7, PFHxA 8, PFPeA 9.1
2025-07-0888th St & Byron Ave (GW)SE24.714.80.3126:2 FTS 20, PFBA 12.1, PFHpA 4.9, PFHxA 12.4, PFPeA 12.6

“<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.

88th St & Byron Ave facility 1 · sample point POE · groundwater

CompoundMRL2025-01-08
SE1		2025-07-08
SE2
6:2 FTS5 ppt8.120
PFBA5 ppt10.312.1
PFBS3 ppt3.33.4
PFHpA3 ppt3.74.9
PFHxA3 ppt812.4
PFHxS3 ppt< 33.1
PFOA4 ppt< 44.7
PFOS4 ppt13.314.8
PFPeA3 ppt9.112.6
11Cl-PF3OUdS5 ppt< 5< 5
4:2 FTS3 ppt< 3< 3
8:2 FTS5 ppt< 5< 5
9Cl-PF3ONS2 ppt< 2< 2
ADONA3 ppt< 3< 3
HFPO-DA5 ppt< 5< 5
NEtFOSAA5 ppt< 5< 5
NFDHA20 ppt< 20< 20
NMeFOSAA6 ppt< 6< 6
PFDA3 ppt< 3< 3
PFDoA3 ppt< 3< 3
PFEESA3 ppt< 3< 3
PFHpS3 ppt< 3< 3
PFMBA3 ppt< 3< 3
PFMPA4 ppt< 4< 4
PFNA4 ppt< 4< 4
PFPeS4 ppt< 4< 4
PFTA8 ppt< 8< 8
PFTrDA7 ppt< 7< 7
PFUnA2 ppt< 2< 2
lithium9 µg/L< 9< 9

Statistics by compound

CompoundResultsDetectedHighest (date)Mean boundsKM medianP75P90P95
6:2 FTS2100%20
2025-07-08		14.05–14.05fewer than 4 results: raw values only
PFBA2100%12.1
2025-07-08		11.2–11.2fewer than 4 results: raw values only
PFBS2100%3.4
2025-07-08		3.35–3.35fewer than 4 results: raw values only
PFHpA2100%4.9
2025-07-08		4.3–4.3fewer than 4 results: raw values only
PFHxA2100%12.4
2025-07-08		10.2–10.2fewer than 4 results: raw values only
PFOS2100%14.8
2025-07-08		14.05–14.05fewer than 4 results: raw values only
PFPeA2100%12.6
2025-07-08		10.85–10.85fewer than 4 results: raw values only
PFHxS250%3.1
2025-07-08		1.55–3.05fewer than 4 results: raw values only
PFOA250%4.7
2025-07-08		2.35–4.35fewer than 4 results: raw values only

Never detected (21): 11Cl-PF3OUdS, 4:2 FTS, 8:2 FTS, 9Cl-PF3ONS, ADONA, HFPO-DA, NEtFOSAA, NFDHA, NMeFOSAA, PFDA, PFDoA, PFEESA, PFHpS, 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 2023-01-03 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.