Full contaminant data, sample history, and sourcing for Kleberg County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
347 well testing events on record, covering
18 analytes.
Data spans 1943 to 2025.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. TX Avg
Chloride
80
1943–1969
100%
149% of limit
↑ 317% above
Sulfate
75
1943–1969
100%
98% of limit
↑ 244% above
Iron
150
1941–2021
57%
87% of limit
↓ 44% below
Manganese
114
1941–2021
46%
14% of limit
↓ 78% below
Arsenic
86
1990–2021
57%
41% of limit
~ typical
Uranium
34
1990–2021
82%
27% of limit
↑ 72% above
Fluoride
292
1941–2021
99%
18% of limit
↓ 27% below
HFPO-DA (GenX)
municipal
22
2023–2024
0%
—
—
Lead
85
1990–2021
2%
11% of limit
↓ 33% below
Nitrate
88
1943–1992
95%
13% of limit
↓ 43% below
PFHxS
municipal
22
2023–2024
0%
—
—
PFNA
municipal
22
2023–2024
0%
—
—
PFOA
municipal
22
2023–2024
0%
—
—
PFOS
municipal
22
2023–2024
0%
—
—
Sodium
62
1945–1968
100%
—
↑ 224% above
pH
80
1943–1969
100%
—
~ typical
PFBS
municipal
22
2023–2024
5%
—
~ typical
Hardness
80
1943–1969
100%
—
↓ 36% 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 Kleberg County
Of the 86 arsenic tests on record for Kleberg County (1990–2021),
43% found none, and half were below 2.38 µg/L.
Of the 80 chloride tests on record for Kleberg County (1943–1969),
0% found none, and half were below 372 mg/L.
Of the 292 fluoride tests on record for Kleberg County (1941–2021),
1% found none, and half were below 700 µg/L.
Of the 150 iron tests on record for Kleberg County (1941–2021),
43% found none, and half were below 50 µg/L.
Of the 85 lead tests on record for Kleberg County (1990–2021),
98% found none.
Of the 114 manganese tests on record for Kleberg County (1941–2021),
54% found none.
Of the 88 nitrate tests on record for Kleberg County (1943–1992),
5% found none, and half were below 1.2 mg/L.
Of the 75 sulfate tests on record for Kleberg County (1943–1969),
0% found none, and half were below 245 mg/L.
Of the 34 uranium tests on record for Kleberg County (1990–2021),
18% found none, and half were below 7.53 µg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Chloride 80 samples
Sulfate 75 samples
Iron 150 samples
Manganese 114 samples
Arsenic 86 samples
Uranium 34 samples
Fluoride 292 samples
Lead 85 samples
Nitrate 88 samples
Sodium 62 samples
pH 80 samples
Hardness 80 samples
No private-well PFAS data for Kleberg County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Kleberg County.
PFAS has been detected in local public water systems (UCMR 5 data) — indicated by the "municipal" badge in the table above — but this does not directly indicate private well contamination.
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 Kleberg County
12Active public water systems
32,881Residents on public water
1%Households on private wells
Public water systems in Kleberg 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 Kleberg 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 Kleberg 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 Kleberg County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Kleberg 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 Kleberg County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Kleberg 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.