Full contaminant data, sample history, and sourcing for Hendry County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
1024 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
1
2019
100%
503% of limit
↑ 1616% above
Iron
167
1924–2024
93%
400% of limit
↑ 99% above
Chloride
912
1924–2024
100%
28% of limit
↓ 44% below
Sulfate
164
1924–2024
99%
14% of limit
↓ 47% below
Uranium
56
1998–2019
84%
4% of limit
↑ 326% above
Nitrate
95
1933–2019
61%
1% of limit
↓ 83% below
Manganese
91
1976–2024
98%
21% of limit
~ typical
Arsenic
88
1976–2024
97%
14% of limit
~ typical
Fluoride
148
1933–2024
94%
7% of limit
~ typical
PFNA
municipal
8
2023–2025
0%
—
—
PFOA
municipal
8
2023–2025
0%
—
—
HFPO-DA (GenX)
municipal
8
2023–2025
0%
—
—
Nitrite
74
1975–2019
70%
1% of limit
~ typical
Lead
88
1976–2024
67%
1% of limit
↓ 58% below
PFHxS
municipal
8
2023–2025
0%
—
—
PFOS
municipal
8
2023–2025
0%
—
—
pH
270
1943–2024
100%
—
~ typical
Sodium
146
1924–2024
100%
—
↓ 51% below
Hardness
236
1924–2019
100%
—
↑ 29% above
Total Coliform
31
2017–2024
97%
—
~ typical
E. coli
13
2019–2024
92%
—
~ typical
Fecal Coliform
18
2017–2021
100%
—
~ typical
PFBS
municipal
8
2023–2025
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 Hendry County
Of the 88 arsenic tests on record for Hendry County (1976–2024),
3% found none, and half were below 1.27 µg/L.
Of the 912 chloride tests on record for Hendry County (1924–2024),
0% found none, and half were below 69 mg/L.
Of the 148 fluoride tests on record for Hendry County (1933–2024),
6% found none, and half were below 250 µg/L.
Of the 167 iron tests on record for Hendry County (1924–2024),
7% found none, and half were below 940 µg/L.
Of the 88 lead tests on record for Hendry County (1976–2024),
33% found none, and half were below 70 ng/L.
Of the 91 manganese tests on record for Hendry County (1976–2024),
2% found none, and half were below 10.5 µg/L.
Of the 95 nitrate tests on record for Hendry County (1933–2019),
39% found none.
Of the 164 sulfate tests on record for Hendry County (1924–2024),
1% found none, and half were below 34.3 mg/L.
Of the 56 uranium tests on record for Hendry County (1998–2019),
16% found none, and half were below 0.646 µg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Iron 167 samples
Chloride 912 samples
Sulfate 164 samples
Uranium 56 samples
Nitrate 95 samples
Manganese 91 samples
Arsenic 88 samples
Fluoride 148 samples
Nitrite 74 samples
Lead 88 samples
pH 270 samples
Sodium 146 samples
Hardness 236 samples
Total Coliform 31 samples
Fecal Coliform 18 samples
Limited data (<15 samples) — interpret with caution
Radon 1 sample
E. coli 13 samples
No private-well PFAS data for Hendry County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Hendry 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 Hendry County
42Active public water systems
41,535Residents on public water
36%Households on private wells
Public water systems in Hendry 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 Hendry 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 Hendry 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 Hendry County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Hendry 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 Hendry County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Hendry 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.