Data & Methodology — Osceola County

Full contaminant data, sample history, and sourcing for Osceola County. For readers who want to go beyond the summary.

Contaminant Data — All Analytes

303 well testing events on record, covering 23 analytes. Data spans 1952 to 2024.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. FL Avg
Iron 173 1964–2024 97%
23% of limit ↓ 88% below
Chloride 287 1964–2024 98%
14% of limit ↓ 71% below
PFOS municipal 26 2023–2025 8%
104% of limit ↓ 51% below
Sulfate 269 1964–2024 97%
13% of limit ↓ 50% below
Manganese 103 1977–2024 100%
2% of limit ↓ 91% below
Lead 100 1977–2024 92%
0% of limit ↓ 89% below
Nitrate 36 1964–2003 86%
0% of limit ↓ 100% below
PFHxS municipal 26 2023–2025 0%
— —
Radon 4 1993–2002 100%
13% of limit ↓ 57% below
Uranium 6 2002–2008 50%
0% of limit ↓ 90% below
Arsenic 100 1977–2024 98%
5% of limit ↓ 62% below
PFNA municipal 26 2023–2025 0%
— —
PFOA municipal 26 2023–2025 0%
— —
Fluoride 114 1964–2024 100%
5% of limit ↓ 30% below
HFPO-DA (GenX) municipal 26 2023–2025 0%
— —
Nitrite 26 1972–2003 38%
0% of limit ↓ 100% below
pH 242 1964–2024 100%
— ~ typical
Sodium 257 1964–2024 95%
— ↓ 62% below
PFBS municipal 26 2023–2025 0%
— —
Fecal Coliform 10 1977–2020 100%
— ~ typical
Total Coliform 24 1977–2024 100%
— ~ typical
Hardness 166 1964–2023 100%
— ~ typical
E. coli 15 2021–2024 100%
— ~ typical

Distribution shows the share of samples in each concentration band relative to the EPA Maximum Contaminant Level (MCL): Low = below half the MCL, Moderate = between half and the MCL, High = above the MCL. Analytes without an MCL (e.g. sodium, pH) show — in the limit columns. State average is based on county median values across FL.

Compare your result with Osceola County

Of the 100 arsenic tests on record for Osceola County (1977–2024), 2% found none, and half were below 0.5 µg/L.

Of the 287 chloride tests on record for Osceola County (1964–2024), 2% found none, and half were below 35 mg/L.

Of the 114 fluoride tests on record for Osceola County (1964–2024), 0% found none, and half were below 200 µg/L.

Of the 173 iron tests on record for Osceola County (1964–2024), 3% found none, and half were below 66 µg/L.

Of the 100 lead tests on record for Osceola County (1977–2024), 8% found none, and half were below 50 ng/L.

Of the 103 manganese tests on record for Osceola County (1977–2024), 0% found none, and half were below 1.21 µg/L.

Of the 36 nitrate tests on record for Osceola County (1964–2003), 14% found none.

Of the 269 sulfate tests on record for Osceola County (1964–2024), 3% found none, and half were below 31.6 mg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 173 samples
  • Chloride 287 samples
  • Sulfate 269 samples
  • Manganese 103 samples
  • Lead 100 samples
  • Nitrate 36 samples
  • Arsenic 100 samples
  • Fluoride 114 samples
  • Nitrite 26 samples
  • pH 242 samples
  • Sodium 257 samples
  • Total Coliform 24 samples
  • Hardness 166 samples
  • E. coli 15 samples

Limited data (<15 samples) — interpret with caution

  • Radon 4 samples
  • Uranium 6 samples
  • Fecal Coliform 10 samples

No private-well PFAS data for Osceola County

We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Osceola County. PFAS has been detected in local public water systems (UCMR 5 data) — indicated by the "municipal" badge in the table above — but this does not directly indicate private well contamination. PFAS testing for private wells requires a dedicated lab panel (~$300–$500). If you are near a military base, airport, or industrial site, consider testing proactively. Learn more about PFAS →

Public vs. Private Water in Osceola County

63 Active public water systems
328,345 Residents on public water
28% Households on private wells

Public water systems in Osceola County are regulated by the EPA and must test and report contaminant levels. Private well owners are responsible for their own testing — there is no routine monitoring of private wells by any government agency.

CDC Health Outcome Correlations

Where contaminants detected in Osceola County have established associations with specific health outcomes, we cross-reference CDC PLACES county-level prevalence data. This is a contextual signal, not a causal claim.

Contaminant Associated Condition Osceola County Prevalence FL Average Source Year
PFOS Cancer prevalence 5.1% 6.8% 2020

Source: CDC PLACES county-level estimates. Raw data: Download Osceola County CDC PLACES data →

Data Sources

This report aggregates data from the following public databases:

Methodology

Raw records are downloaded from the Water Quality Portal and normalized to µg/L (ppb). Records are deduplicated by sample ID and date, and certified outliers are excluded. Analyte names are mapped to EPA canonical forms. Detection rates, distribution bands, and MCL comparisons are computed from the normalized dataset.

Distribution bands use the EPA Maximum Contaminant Level as the threshold: concentrations below 50% of the MCL are classed as Low, between 50% and 100% as Moderate, and above 100% as High. For analytes without an MCL (sodium, hardness, pH), distribution is not computed.

State comparison uses the median of county median values across all counties in FL with at least one sample for that analyte.

Last updated: 2026-08-12

Full methodology →