Data & Methodology — Culberson County

Full contaminant data, sample history, and sourcing for Culberson County. For readers who want to go beyond the summary.

Contaminant Data — All Analytes

504 well testing events on record, covering 12 analytes. Data spans 1956 to 2019.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. TX Avg
Chloride 16 1974–1980 100%
44% of limit ↑ 22% above
Sulfate 16 1974–1980 100%
52% of limit ↑ 82% above
Iron 189 1954–2018 55%
20% of limit ↓ 87% below
Nitrate 37 1992–1999 92%
25% of limit ~ typical
Manganese 183 1954–2018 54%
14% of limit ↓ 78% below
Arsenic 145 1974–2018 46%
37% of limit ~ typical
Fluoride 491 1954–2018 100%
40% of limit ↑ 67% above
Lead 144 1974–2018 10%
9% of limit ↓ 49% below
Uranium 22 2007–2018 100%
23% of limit ↑ 51% above
Sodium 16 1974–1980 100%
— ↑ 23% above
pH 16 1974–1980 100%
— ~ typical
Hardness 16 1974–1980 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 TX.

Compare your result with Culberson County

Of the 145 arsenic tests on record for Culberson County (1974–2018), 54% found none.

Of the 491 fluoride tests on record for Culberson County (1954–2018), 0% found none, and half were below 1.6 mg/L.

Of the 189 iron tests on record for Culberson County (1954–2018), 45% found none, and half were below 10 µg/L.

Of the 144 lead tests on record for Culberson County (1974–2018), 90% found none.

Of the 183 manganese tests on record for Culberson County (1954–2018), 46% found none, and half were below 1 µg/L.

Of the 37 nitrate tests on record for Culberson County (1992–1999), 8% found none, and half were below 2.51 mg/L.

Of the 22 uranium tests on record for Culberson County (2007–2018), 0% found none, and half were below 7.01 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Chloride 16 samples
  • Sulfate 16 samples
  • Iron 189 samples
  • Nitrate 37 samples
  • Manganese 183 samples
  • Arsenic 145 samples
  • Fluoride 491 samples
  • Lead 144 samples
  • Uranium 22 samples
  • Sodium 16 samples
  • pH 16 samples
  • Hardness 16 samples

No private-well PFAS data for Culberson County

We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Culberson 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 Culberson County

12 Active public water systems
4,216 Residents on public water
6% Households on private wells

Public water systems in Culberson 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 Culberson 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.

Contaminant Associated Condition Culberson County Prevalence TX Average Source Year
Arsenic Cancer prevalence 6.2% 6.1% 2020
Arsenic Kidney disease rate 4.9% 3.3% 2020
Lead Heart disease rate 10.2% 7.4% 2020

Source: CDC PLACES county-level estimates. Raw data: Download Culberson County CDC PLACES data →

Data Sources

This report aggregates data from the following public databases:

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.

Last updated: 2026-08-04

Full methodology →