Perfluorooctanesulfonic acid
33ng/L
Each block = 4.0 ng/L federal MCL (2024)
Short answer: Two PFAS, PFOA and PFOS, are above their federal limits (2024 limits that water systems have until at least 2029 to meet); 5 more are detected with no federal limit, and everything else measured is within its reference or not detected. MDWASA - Main System serves 2,377,460 residents.
This report uses the largest, MDWASA - MAIN SYSTEM. Your water bill or annual water quality report names your actual supplier.
Source: EPA SDWIS 2026Q2.
Each bar is drawn in blocks of the 4.0 ng/L federal MCL (2024), so the length shows how far above it the result sits.
33ng/L
Each block = 4.0 ng/L federal MCL (2024)
14ng/L
Each block = 4.0 ng/L federal MCL (2024)
MDWASA - MAIN SYSTEM (EPA PWSID FL4130871) delivers groundwater to 2,377,460 residents. This report reflects 29 individual PFAS result(s) from the source UCMR5 observations and the latest Lead & Copper Rule 90th-percentile result. Water hardness and disinfectant type are pending the utility's own annual report.
0health-based violations in the last 10 years
From EPA SDWIS. A clean violation history means no enforcement action was recorded; it does not cover contaminants without a limit.
No result is not a pass. Your utility's annual water quality report may list them, and a certified lab test covers your own tap.
Plumbing inside a home can add lead that the system record can't show. A tap test tells you what reaches your glass.
PFOS 33 ng/L, above the 4 ng/L limit (+10 more PFAS detected)
lead 3.1 µg/L, below the 15 µg/L action level
Screening tells you if something is worth a closer look; a lab result is the number you can act on.
As an Amazon Associate, PurityMap earns from qualifying purchases. Affiliate disclosure.
Screening: quick check, not lab-grade
Safe Home (EnviroTestKits)
Lead, read as one of three ranges: 0–4, 5–15 or 15+ ppb
What it can't tell you: It shows a lead range, not an exact level, and tests nothing else unless you pay extra for the optional lab test.
Lab-certified results
ETR Laboratories
50+ substances, including lead, copper, arsenic, nitrate, hardness and coliform bacteria
What it can't tell you: It does not test PFAS, and not every result on the panel falls under the lab's accredited scope.
Each card names which Miami findings its current certification covers, and which it doesn't.
As an Amazon Associate, PurityMap earns from qualifying purchases. A product appears here only when a current certification record covers at least one identified concern; every concern stays listed. The retail offer is looked up afterwards and never changes which products appear or their order. Affiliate disclosure.









PurityMap does not give a safe/unsafe verdict; it shows what the public records measured. For Miami, PFOS 33 ng/L and PFOA 14 ng/L were measured above the 4 ng/L federal limit in EPA's 2024 testing; the lead 90th-percentile result was 3.1 µg/L against the 15 µg/L action level. MDWASA - MAIN SYSTEM (PWSID FL4130871) has a Purity Score of 54/100 (confidence: moderate), assessed at the water-system level and computed only from contaminants that were measured. Water can change in your own pipes, so a certified test is the only way to know what comes out of your tap.
MDWASA - MAIN SYSTEM (PWS ID FL4130871) is the public water system on record for Miami, Florida, serving about 2,377,460 people. Confirm the utility on your water bill before acting on a specific finding.
Groundwater (primary source of record in EPA SDWIS).
Yes. In EPA's UCMR 5 testing (2023-11-08 to 2024-05-15), PFOS was measured at 33 ng/L against a 4 ng/L federal limit and PFOA was measured at 14 ng/L against a 4 ng/L federal limit. PFBS (4.6 ng/L, below the 2,000 ng/L EPA health advisory), PFHxA (58 ng/L, below the 400,000 ng/L state limit), PFHxS (9.4 ng/L, below the 10 ng/L federal limit) and PFNA (6.5 ng/L, below the 10 ng/L federal limit) were also detected. 6:2 FTS (190 ng/L), 8:2 FTS (9.6 ng/L), PFBA (22 ng/L), PFHpA (20 ng/L) and PFPeA (56 ng/L) were also detected; they have no federal or state limit. Reverse osmosis and filters certified to NSF/ANSI 53 for PFOA/PFOS reduce them at the tap.
MDWASA - MAIN SYSTEM's most recent lead 90th-percentile result (2023) was 3.1 µg/L, below the 15 µg/L action level. That figure comes from sampled homes; lead usually enters from a building's own pipes and fixtures, so only a test at your tap tells you what you drink.
PurityMap's current record for Miami holds 31 findings: 2 above a reference, 5 detected within the reference, 5 detected with no limit and 19 not detected. Each finding links to its dated public record; a parameter that was never monitored is shown as pending, not as a pass.
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Perfluorooctanesulfonic acid (PFOS)
Perfluorohexanesulfonic acid (PFHxS)
Perfluorobutanesulfonic acid (PFBS)
Perfluorohexanoic acid (PFHxA)
1H, 1H, 2H, 2H-perfluorodecane sulfonic acid (8:2 FTS)
1H, 1H, 2H, 2H-perfluorooctane sulfonic acid (6:2 FTS)
Perfluoroheptanoic acid (PFHpA)
Perfluoropentanoic acid (PFPeA)
11-Chloroeicosafluoro-3-oxaundecane-1-sulfonic acid (11Cl-PF3OUdS)
1H, 1H, 2H, 2H-perfluorohexane sulfonic acid (4:2 FTS)
4,8-Dioxa-3H-perfluorononanoic acid (ADONA)
9-Chlorohexadecafluoro-3-oxanone-1-sulfonic acid (9Cl-PF3ONS)
Hexafluoropropylene oxide dimer acid (HFPO-DA) (GenX chemicals)
N-ethyl perfluorooctanesulfonamidoacetic acid (NEtFOSAA)
N-methyl perfluorooctanesulfonamidoacetic acid (NMeFOSAA)
Nonafluoro-3,6-dioxaheptanoic acid (NFDHA)
Perfluoro (2-ethoxyethane) sulfonic acid (PFEESA)
Perfluoro-3-methoxypropanoic acid (PFMPA)
Perfluoro-4-methoxybutanoic acid (PFMBA)
Perfluorododecanoic acid (PFDoA)
Perfluoroheptanesulfonic acid (PFHpS)
Perfluoropentanesulfonic acid (PFPeS)
Perfluorotetradecanoic acid (PFTA)
Perfluorotridecanoic acid (PFTrDA)
Perfluoroundecanoic acid (PFUnA)
Every value is the published result from the cited public record. A reporting limit is the lowest level the method could reliably quantify; a non-detect is not a guarantee of zero.
UCMR5 Analytical Results
UCMR5 Analytical Results: MDWASA - MAIN SYSTEM (FL4130871)
US EPA
State SDWIS Compliance Record
Lead & Copper Rule 90th-percentile: MDWASA - MAIN SYSTEM (FL4130871)
US EPA SDWIS
Methodology: how we analyze water. Prepared with AI assistance and reviewed by the PurityMap Editorial Team before publication.
Start with the hot-or-cold tap check. Where MDWASA - Main System reported something related, it's shown below.
Lead at MDWASA - Main System: 3.1 µg/L (90th percentile, 2023 monitoring period). Lead has no taste, so a taste neither shows nor rules it out.