Data & Methodology — Goliad County

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

Contaminant Data — All Analytes

213 well testing events on record, covering 13 analytes. Data spans 1959 to 2016.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. TX Avg
Arsenic 67 1990–2021 67%
60% of limit ↑ 57% above
Chloride 19 2006–2016 100%
67% of limit ↑ 87% above
Iron 70 1954–2021 34%
14% of limit ↓ 91% below
Fluoride 211 1945–2021 100%
15% of limit ↓ 37% below
Lead 67 1990–2021 36%
3% of limit ↓ 83% below
Manganese 67 1990–2021 40%
2% of limit ↓ 96% below
Nitrate 35 1970–2016 89%
10% of limit ↓ 57% below
Nitrite 17 2006–2016 0%
— —
Sulfate 19 2006–2016 100%
10% of limit ↓ 65% below
Uranium 33 1990–2021 97%
8% of limit ↓ 47% below
Hardness 19 2006–2016 100%
— ↑ 22% above
pH 19 2006–2016 100%
— ~ typical
Sodium 19 2006–2016 100%
— ↓ 40% 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 Goliad County

Of the 67 arsenic tests on record for Goliad County (1990–2021), 33% found none, and half were below 1.6 µg/L.

Of the 211 fluoride tests on record for Goliad County (1945–2021), 0% found none, and half were below 600 µg/L.

Of the 70 iron tests on record for Goliad County (1954–2021), 66% found none.

Of the 67 lead tests on record for Goliad County (1990–2021), 64% found none.

Of the 67 manganese tests on record for Goliad County (1990–2021), 60% found none.

Of the 35 nitrate tests on record for Goliad County (1970–2016), 11% found none, and half were below 920 µg/L.

Of the 33 uranium tests on record for Goliad County (1990–2021), 3% found none, and half were below 2 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Arsenic 67 samples
  • Chloride 19 samples
  • Iron 70 samples
  • Fluoride 211 samples
  • Lead 67 samples
  • Manganese 67 samples
  • Nitrate 35 samples
  • Nitrite 17 samples
  • Sulfate 19 samples
  • Uranium 33 samples
  • Hardness 19 samples
  • pH 19 samples
  • Sodium 19 samples

No private-well PFAS data for Goliad County

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

7 Active public water systems
3,616 Residents on public water
50% Households on private wells

Public water systems in Goliad 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 Goliad 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 Goliad County Prevalence TX Average Source Year
Arsenic Cancer prevalence 5.5% 6.1% 2020
Arsenic Kidney disease rate 4.0% 3.3% 2020

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