Full contaminant data, sample history, and sourcing for Gadsden County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
103 well testing events on record, covering
23 analytes.
Data spans 1924 to 2022.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. FL Avg
Arsenic
26
1976–2025
85%
10% of limit
↓ 23% below
Chloride
88
1970–2025
100%
1% of limit
↓ 97% below
Iron
80
1973–2025
65%
15% of limit
↓ 93% below
Sulfate
87
1970–2025
99%
4% of limit
↓ 85% below
Manganese
37
1973–2025
62%
10% of limit
↓ 61% below
PFNA
municipal
24
2023–2024
0%
—
—
PFOA
municipal
24
2023–2024
0%
—
—
Fluoride
79
1970–2025
99%
12% of limit
↑ 76% above
HFPO-DA (GenX)
municipal
24
2023–2024
0%
—
—
Nitrite
18
1970–2010
17%
0% of limit
↓ 76% below
Lead
23
1976–2025
78%
2% of limit
↓ 43% below
Nitrate
18
1970–2010
78%
3% of limit
~ typical
PFHxS
municipal
24
2023–2024
0%
—
—
PFOS
municipal
24
2023–2024
0%
—
—
Radon
13
1995–2001
100%
10% of limit
↓ 65% below
Uranium
1
1995
0%
—
—
Hardness
69
1970–2010
100%
—
↓ 48% below
Total Coliform
17
2017–2025
100%
—
~ typical
Sodium
87
1970–2025
100%
—
↓ 83% below
pH
89
1970–2025
100%
—
~ typical
E. coli
9
2023–2025
100%
—
~ typical
Fecal Coliform
8
2017–2021
100%
—
~ typical
PFBS
municipal
24
2023–2024
0%
—
—
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 Gadsden County
Of the 26 arsenic tests on record for Gadsden County (1976–2025),
15% found none, and half were below 0.425 µg/L.
Of the 88 chloride tests on record for Gadsden County (1970–2025),
0% found none, and half were below 3.7 mg/L.
Of the 79 fluoride tests on record for Gadsden County (1970–2025),
1% found none, and half were below 500 µg/L.
Of the 80 iron tests on record for Gadsden County (1973–2025),
35% found none, and half were below 20 µg/L.
Of the 23 lead tests on record for Gadsden County (1976–2025),
22% found none, and half were below 0.23 µg/L.
Of the 37 manganese tests on record for Gadsden County (1973–2025),
38% found none, and half were below 1.1 µg/L.
Of the 87 sulfate tests on record for Gadsden County (1970–2025),
1% found none, and half were below 10 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Arsenic 26 samples
Chloride 88 samples
Iron 80 samples
Sulfate 87 samples
Manganese 37 samples
Fluoride 79 samples
Nitrite 18 samples
Lead 23 samples
Nitrate 18 samples
Hardness 69 samples
Total Coliform 17 samples
Sodium 87 samples
pH 89 samples
Limited data (<15 samples) — interpret with caution
Radon 13 samples
Uranium 1 sample
E. coli 9 samples
Fecal Coliform 8 samples
No private-well PFAS data for Gadsden County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Gadsden County.
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 Gadsden County
26Active public water systems
39,434Residents on public water
32%Households on private wells
Public water systems in Gadsden 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 Gadsden 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.
This report aggregates data from the following public databases:
Water Quality Portal (WQP) — groundwater sample results for Gadsden County from EPA, USGS, and state agencies. Browse WQP data →
EPA Safe Drinking Water Information System (SDWIS) — public water system inventory used to estimate the share of residents on private wells. Browse SDWIS →
Census ACS 5-Year Estimates — well and cistern household counts (variable DP04_0074E) used to calculate the private-well percentage for Gadsden County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Gadsden County, which informs which contaminants are geologically likely. USGS Aquifer Atlas →
EPA UCMR 5 (2023–2025) — PFAS occurrence data from public water systems, used as a proxy indicator for aquifer PFAS exposure. Rows marked "municipal" in the table above come from this source. About UCMR 5 →
EPA Toxics Release Inventory (TRI) — industrial facility chemical releases near Gadsden County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Gadsden County, used in contamination risk scoring. Superfund site search →
CDC PLACES — county-level health outcome prevalence (kidney disease, cancer, heart disease) correlated with detected contaminants. About CDC PLACES →
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.