Data & Methodology — Lee County

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

Contaminant Data — All Analytes

6880 well testing events on record, covering 23 analytes. Data spans 1901 to 2025.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. FL Avg
Radon 9 2000–2019 100%
400% of limit ↑ 1264% above
Chloride 6389 1901–2025 100%
70% of limit ↑ 43% above
Iron 796 1908–2024 81%
20% of limit ↓ 90% below
Sulfate 940 1908–2025 100%
24% of limit ~ typical
PFOS municipal 35 2023–2025 11%
214% of limit ~ typical
Manganese 210 1971–2024 84%
13% of limit ↓ 50% below
Arsenic 200 1971–2024 88%
3% of limit ↓ 75% below
PFOA municipal 35 2023–2025 3%
105% of limit ↓ 26% below
Lead 202 1971–2024 71%
1% of limit ↓ 58% below
Fluoride 866 1923–2025 100%
19% of limit ↑ 164% above
Uranium 6 2015–2019 67%
1% of limit ~ typical
PFHxS municipal 35 2023–2025 6%
40% of limit ↓ 23% below
Nitrate 238 1943–2019 97%
0% of limit ↓ 100% below
Nitrite 176 1969–2019 78%
1% of limit ~ typical
HFPO-DA (GenX) municipal 35 2023–2025 0%
— —
PFNA municipal 35 2023–2025 0%
— —
Sodium 868 1943–2025 100%
— ↑ 66% above
PFBS municipal 35 2023–2025 17%
— ~ typical
Fecal Coliform 97 1986–2021 100%
— ~ typical
E. coli 68 2015–2025 91%
— ~ typical
pH 1360 1943–2025 100%
— ~ typical
Total Coliform 164 2013–2025 97%
— ~ typical
Hardness 746 1908–2019 100%
— ↑ 51% above

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 Lee County

Of the 200 arsenic tests on record for Lee County (1971–2024), 12% found none, and half were below 0.215 µg/L.

Of the 6389 chloride tests on record for Lee County (1901–2025), 0% found none, and half were below 175 mg/L.

Of the 866 fluoride tests on record for Lee County (1923–2025), 0% found none, and half were below 750 µg/L.

Of the 796 iron tests on record for Lee County (1908–2024), 19% found none, and half were below 40 µg/L.

Of the 202 lead tests on record for Lee County (1971–2024), 29% found none, and half were below 0.2 µg/L.

Of the 210 manganese tests on record for Lee County (1971–2024), 16% found none, and half were below 4.85 µg/L.

Of the 238 nitrate tests on record for Lee County (1943–2019), 3% found none.

Of the 940 sulfate tests on record for Lee County (1908–2025), 0% found none, and half were below 59 mg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Chloride 6389 samples
  • Iron 796 samples
  • Sulfate 940 samples
  • Manganese 210 samples
  • Arsenic 200 samples
  • Lead 202 samples
  • Fluoride 866 samples
  • Nitrate 238 samples
  • Nitrite 176 samples
  • Sodium 868 samples
  • Fecal Coliform 97 samples
  • E. coli 68 samples
  • pH 1360 samples
  • Total Coliform 164 samples
  • Hardness 746 samples

Limited data (<15 samples) — interpret with caution

  • Radon 9 samples
  • Uranium 6 samples

No private-well PFAS data for Lee County

We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Lee 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 Lee County

80 Active public water systems
730,406 Residents on public water
25% Households on private wells

Public water systems in Lee 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 Lee 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 Lee County Prevalence FL Average Source Year
Arsenic Cancer prevalence 5.9% 6.8% 2020
Arsenic Kidney disease rate 2.7% 3.4% 2020
Lead Heart disease rate 6.1% 7.7% 2020

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