Full contaminant data, sample history, and sourcing for Okaloosa County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
304 well testing events on record, covering
23 analytes.
Data spans 1949 to 2025.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. FL Avg
Iron
180
1949–2025
99%
57% of limit
↓ 72% below
Lead
37
1975–2025
84%
1% of limit
↓ 58% below
Manganese
161
1950–2025
93%
0% of limit
↓ 100% below
Arsenic
38
1975–2025
92%
6% of limit
↓ 57% below
Chloride
267
1949–2025
100%
3% of limit
↓ 94% below
Sulfate
230
1949–2025
100%
2% of limit
↓ 91% below
Fluoride
230
1949–2025
97%
5% of limit
↓ 30% below
HFPO-DA (GenX)
municipal
164
2023–2025
0%
—
—
Nitrite
15
1968–2015
27%
27% of limit
↑ 2060% above
PFNA
municipal
164
2023–2025
0%
—
—
PFOA
municipal
164
2023–2025
0%
—
—
Radon
2
2009–2015
100%
21% of limit
↓ 30% below
Uranium
3
1975–2015
0%
—
—
Nitrate
194
1949–2015
99%
0% of limit
↓ 93% below
PFHxS
municipal
164
2023–2025
0%
—
—
PFOS
municipal
164
2023–2025
0%
—
—
Total Coliform
30
2009–2025
97%
—
~ typical
E. coli
10
2009–2025
92%
—
~ typical
Fecal Coliform
20
2017–2021
100%
—
~ typical
PFBS
municipal
164
2023–2025
0%
—
—
Sodium
202
1957–2025
100%
—
↓ 82% below
pH
253
1949–2025
100%
—
~ typical
Hardness
200
1949–2015
100%
—
↓ 71% below
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 Okaloosa County
Of the 38 arsenic tests on record for Okaloosa County (1975–2025),
8% found none, and half were below 0.36 µg/L.
Of the 267 chloride tests on record for Okaloosa County (1949–2025),
0% found none, and half were below 7.4 mg/L.
Of the 230 fluoride tests on record for Okaloosa County (1949–2025),
3% found none, and half were below 200 µg/L.
Of the 180 iron tests on record for Okaloosa County (1949–2025),
1% found none, and half were below 170 µg/L.
Of the 37 lead tests on record for Okaloosa County (1975–2025),
16% found none, and half were below 0.2 µg/L.
Of the 161 manganese tests on record for Okaloosa County (1950–2025),
7% found none.
Of the 194 nitrate tests on record for Okaloosa County (1949–2015),
1% found none, and half were below 23 µg/L.
Of the 230 sulfate tests on record for Okaloosa County (1949–2025),
0% found none, and half were below 6 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Iron 180 samples
Lead 37 samples
Manganese 161 samples
Arsenic 38 samples
Chloride 267 samples
Sulfate 230 samples
Fluoride 230 samples
Nitrite 15 samples
Nitrate 194 samples
Total Coliform 30 samples
Fecal Coliform 20 samples
Sodium 202 samples
pH 253 samples
Hardness 200 samples
Limited data (<15 samples) — interpret with caution
Radon 2 samples
Uranium 3 samples
E. coli 10 samples
No private-well PFAS data for Okaloosa County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Okaloosa 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 Okaloosa County
36Active public water systems
283,881Residents on public water
8%Households on private wells
Public water systems in Okaloosa 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 Okaloosa 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 Okaloosa 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 Okaloosa County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Okaloosa 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 Okaloosa County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Okaloosa 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.