Full contaminant data, sample history, and sourcing for Jasper County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
364 well testing events on record, covering
20 analytes.
Data spans 1942 to 2023.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. TX Avg
Manganese
140
1962–2021
84%
75% of limit
~ typical
Iron
232
1941–2021
76%
53% of limit
↓ 65% below
Chloride
62
1942–2005
100%
3% of limit
↓ 91% below
Nitrate
80
1942–2005
95%
2% of limit
↓ 91% below
Arsenic
127
1992–2021
15%
29% of limit
↓ 24% below
Fluoride
329
1941–2021
92%
5% of limit
↓ 79% below
HFPO-DA (GenX)
municipal
18
2023–2024
0%
—
—
Lead
126
1992–2021
13%
7% of limit
↓ 57% below
Nitrite
5
2005
0%
—
—
PFHxS
municipal
18
2023–2024
0%
—
—
PFNA
municipal
18
2023–2024
0%
—
—
PFOA
municipal
18
2023–2024
0%
—
—
PFOS
municipal
18
2023–2024
0%
—
—
Radon
5
2005
100%
7% of limit
↓ 80% below
Sulfate
62
1942–2005
100%
2% of limit
↓ 94% below
Uranium
54
2005–2021
11%
0% of limit
↓ 99% below
Sodium
62
1942–2005
100%
—
↓ 77% below
pH
54
1950–2005
100%
—
~ typical
PFBS
municipal
18
2023–2024
0%
—
—
Hardness
61
1942–2005
100%
—
↓ 82% 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 Jasper County
Of the 127 arsenic tests on record for Jasper County (1992–2021),
85% found none.
Of the 62 chloride tests on record for Jasper County (1942–2005),
0% found none, and half were below 8 mg/L.
Of the 329 fluoride tests on record for Jasper County (1941–2021),
8% found none, and half were below 180 µg/L.
Of the 232 iron tests on record for Jasper County (1941–2021),
24% found none, and half were below 89.6 µg/L.
Of the 126 lead tests on record for Jasper County (1992–2021),
87% found none.
Of the 140 manganese tests on record for Jasper County (1962–2021),
16% found none, and half were below 19.6 µg/L.
Of the 80 nitrate tests on record for Jasper County (1942–2005),
5% found none, and half were below 200 µg/L.
Of the 62 sulfate tests on record for Jasper County (1942–2005),
0% found none, and half were below 4 mg/L.
Of the 54 uranium tests on record for Jasper County (2005–2021),
89% found none.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Manganese 140 samples
Iron 232 samples
Chloride 62 samples
Nitrate 80 samples
Arsenic 127 samples
Fluoride 329 samples
Lead 126 samples
Sulfate 62 samples
Uranium 54 samples
Sodium 62 samples
pH 54 samples
Hardness 61 samples
Limited data (<15 samples) — interpret with caution
Nitrite 5 samples
Radon 5 samples
No private-well PFAS data for Jasper County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Jasper 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 Jasper County
26Active public water systems
33,108Residents on public water
16%Households on private wells
Public water systems in Jasper 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 Jasper 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 Jasper 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 Jasper County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Jasper 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 Jasper County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Jasper 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.