Full contaminant data, sample history, and sourcing for Wood County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
402 well testing events on record, covering
18 analytes.
Data spans 1942 to 2018.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. TX Avg
Iron
217
1941–2018
83%
30% of limit
↓ 80% below
Manganese
104
1965–2018
78%
24% of limit
↓ 63% below
Sulfate
68
1942–1980
100%
8% of limit
↓ 71% below
Nitrate
87
1942–2006
77%
4% of limit
↓ 82% below
Chloride
68
1942–1980
100%
6% of limit
↓ 83% below
Lead
68
1981–2018
12%
24% of limit
↑ 42% above
Arsenic
72
1981–2018
1%
14% of limit
↓ 63% below
Fluoride
339
1942–2018
94%
5% of limit
↓ 79% below
HFPO-DA (GenX)
municipal
99
2023–2025
0%
—
—
PFHxS
municipal
99
2023–2025
0%
—
—
PFNA
municipal
99
2023–2025
0%
—
—
PFOA
municipal
99
2023–2025
0%
—
—
PFOS
municipal
99
2023–2025
0%
—
—
Uranium
16
2010–2018
0%
—
—
Hardness
68
1942–1980
100%
—
↓ 87% below
PFBS
municipal
99
2023–2025
0%
—
—
pH
67
1957–1980
100%
—
~ typical
Sodium
68
1942–1980
100%
—
↓ 50% 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 TX.
Compare your result with Wood County
Of the 72 arsenic tests on record for Wood County (1981–2018),
99% found none.
Of the 68 chloride tests on record for Wood County (1942–1980),
0% found none, and half were below 15.5 mg/L.
Of the 339 fluoride tests on record for Wood County (1942–2018),
6% found none, and half were below 160 µg/L.
Of the 217 iron tests on record for Wood County (1941–2018),
17% found none, and half were below 60 µg/L.
Of the 68 lead tests on record for Wood County (1981–2018),
88% found none.
Of the 104 manganese tests on record for Wood County (1965–2018),
22% found none, and half were below 8.03 µg/L.
Of the 87 nitrate tests on record for Wood County (1942–2006),
23% found none, and half were below 400 µg/L.
Of the 68 sulfate tests on record for Wood County (1942–1980),
0% found none, and half were below 21 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Iron 217 samples
Manganese 104 samples
Sulfate 68 samples
Nitrate 87 samples
Chloride 68 samples
Lead 68 samples
Arsenic 72 samples
Fluoride 339 samples
Uranium 16 samples
Hardness 68 samples
pH 67 samples
Sodium 68 samples
No private-well PFAS data for Wood County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Wood 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 Wood County
23Active public water systems
67,813Residents on public water
3%Households on private wells
Public water systems in Wood 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 Wood 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 Wood 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 Wood County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Wood 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 Wood County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Wood 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 TX with at least one sample for that analyte.