Full contaminant data, sample history, and sourcing for Gilchrist County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
595 well testing events on record, covering
23 analytes.
Data spans 1956 to 2024.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. FL Avg
Iron
300
1974–2025
99%
36% of limit
↓ 82% below
Manganese
299
1993–2025
100%
9% of limit
↓ 66% below
Arsenic
298
2002–2025
100%
5% of limit
↓ 62% below
Radon
1
2002
100%
10% of limit
↓ 65% below
Uranium
1
2002
100%
3% of limit
↑ 182% above
Sulfate
485
1972–2025
100%
3% of limit
↓ 89% below
Lead
298
2002–2025
100%
0% of limit
↓ 87% below
Nitrate
26
1972–2025
92%
10% of limit
↑ 196% above
PFHxS
municipal
4
2023
0%
—
—
PFOS
municipal
4
2023
0%
—
—
Fluoride
485
1972–2025
99%
2% of limit
↓ 71% below
HFPO-DA (GenX)
municipal
4
2023
0%
—
—
Nitrite
26
1972–2025
38%
3% of limit
↑ 143% above
Chloride
490
1972–2025
100%
3% of limit
↓ 93% below
PFNA
municipal
4
2023
0%
—
—
PFOA
municipal
4
2023
0%
—
—
pH
568
1972–2025
100%
—
~ typical
Total Coliform
54
2002–2025
99%
—
~ typical
Hardness
12
1972–2003
100%
—
↓ 31% below
Sodium
485
1972–2025
100%
—
↓ 94% below
PFBS
municipal
4
2023
0%
—
—
Fecal Coliform
32
2013–2021
100%
—
~ typical
E. coli
23
2002–2025
100%
—
~ 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 Gilchrist County
Of the 298 arsenic tests on record for Gilchrist County (2002–2025),
0% found none, and half were below 0.5 µg/L.
Of the 490 chloride tests on record for Gilchrist County (1972–2025),
0% found none, and half were below 8.5 mg/L.
Of the 485 fluoride tests on record for Gilchrist County (1972–2025),
1% found none, and half were below 80 µg/L.
Of the 300 iron tests on record for Gilchrist County (1974–2025),
1% found none, and half were below 104 µg/L.
Of the 298 lead tests on record for Gilchrist County (2002–2025),
0% found none, and half were below 61.3 ng/L.
Of the 299 manganese tests on record for Gilchrist County (1993–2025),
0% found none, and half were below 4.45 µg/L.
Of the 26 nitrate tests on record for Gilchrist County (1972–2025),
8% found none, and half were below 900 µg/L.
Of the 485 sulfate tests on record for Gilchrist County (1972–2025),
0% found none, and half were below 7.5 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Iron 300 samples
Manganese 299 samples
Arsenic 298 samples
Sulfate 485 samples
Lead 298 samples
Nitrate 26 samples
Fluoride 485 samples
Nitrite 26 samples
Chloride 490 samples
pH 568 samples
Total Coliform 54 samples
Sodium 485 samples
Fecal Coliform 32 samples
E. coli 23 samples
Limited data (<15 samples) — interpret with caution
Radon 1 sample
Uranium 1 sample
Hardness 12 samples
No private-well PFAS data for Gilchrist County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Gilchrist 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 Gilchrist County
30Active public water systems
5,769Residents on public water
89%Households on private wells
Public water systems in Gilchrist 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 Gilchrist 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 Gilchrist 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 Gilchrist County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Gilchrist 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 Gilchrist County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Gilchrist 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.