Data & Methodology — Charlotte County

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

Contaminant Data — All Analytes

877 well testing events on record, covering 23 analytes. Data spans 1924 to 2025.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. FL Avg
Radon 3 2019 100%
973% of limit ↑ 3218% above
Chloride 835 1924–2025 100%
184% of limit ↑ 277% above
Sulfate 768 1924–2025 100%
99% of limit ↑ 277% above
PFOA municipal 13 2023–2024 15%
116% of limit ~ typical
Iron 533 1924–2025 99%
3% of limit ↓ 99% below
PFOS municipal 13 2023–2024 8%
108% of limit ↓ 49% below
Nitrate 55 1949–2019 95%
1% of limit ↓ 84% below
Manganese 516 1979–2025 98%
1% of limit ↓ 95% below
Fluoride 674 1949–2025 100%
23% of limit ↑ 224% above
Nitrite 15 1973–2019 33%
0% of limit ↓ 68% below
HFPO-DA (GenX) municipal 13 2023–2024 0%
— —
Arsenic 33 1979–2024 94%
2% of limit ↓ 86% below
PFNA municipal 13 2023–2024 0%
— —
Uranium 3 2019 100%
0% of limit ↓ 64% below
PFHxS municipal 13 2023–2024 0%
— —
Lead 42 1975–2024 67%
1% of limit ↓ 58% below
Sodium 621 1924–2025 100%
— ↑ 375% above
pH 600 1949–2025 100%
— ~ typical
PFBS municipal 13 2023–2024 46%
— ~ typical
E. coli 14 2019–2024 79%
— ~ typical
Fecal Coliform 17 2017–2021 100%
— ~ typical
Hardness 182 1924–2019 100%
— ↑ 95% above
Total Coliform 31 2017–2024 90%
— ~ 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 Charlotte County

Of the 33 arsenic tests on record for Charlotte County (1979–2024), 6% found none, and half were below 0.15 µg/L.

Of the 835 chloride tests on record for Charlotte County (1924–2025), 0% found none, and half were below 461 mg/L.

Of the 674 fluoride tests on record for Charlotte County (1949–2025), 0% found none, and half were below 920 µg/L.

Of the 533 iron tests on record for Charlotte County (1924–2025), 1% found none, and half were below 8.5 µg/L.

Of the 42 lead tests on record for Charlotte County (1975–2024), 33% found none, and half were below 50 ng/L.

Of the 516 manganese tests on record for Charlotte County (1979–2025), 2% found none, and half were below 0.63 µg/L.

Of the 55 nitrate tests on record for Charlotte County (1949–2019), 5% found none, and half were below 45 µg/L.

Of the 768 sulfate tests on record for Charlotte County (1924–2025), 0% found none, and half were below 244 mg/L.

Have a number from your lab? Enter it to see where it falls. Nothing is sent anywhere.

Want the full picture for your well? Check all your results.

Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Chloride 835 samples
  • Sulfate 768 samples
  • Iron 533 samples
  • Nitrate 55 samples
  • Manganese 516 samples
  • Fluoride 674 samples
  • Nitrite 15 samples
  • Arsenic 33 samples
  • Lead 42 samples
  • Sodium 621 samples
  • pH 600 samples
  • Fecal Coliform 17 samples
  • Hardness 182 samples
  • Total Coliform 31 samples

Limited data (<15 samples) — interpret with caution

  • Radon 3 samples
  • Uranium 3 samples
  • E. coli 14 samples

No private-well PFAS data for Charlotte County

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

29 Active public water systems
259,220 Residents on public water
8% Households on private wells

Public water systems in Charlotte 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 Charlotte 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 Charlotte County Prevalence FL Average Source Year
Nitrate Cancer prevalence 11.3% 6.8% 2020

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