Data & Methodology — Yoakum County

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

Contaminant Data — All Analytes

226 well testing events on record, covering 20 analytes. Data spans 2001 to 2016.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. TX Avg
Arsenic 137 1990–2021 95%
130% of limit ↑ 239% above
Sulfate 22 2001–2016 100%
90% of limit ↑ 217% above
Fluoride 218 1941–2021 100%
76% of limit ↑ 220% above
Nitrate 50 1990–2016 100%
34% of limit ↑ 55% above
Chloride 22 2001–2016 100%
52% of limit ↑ 46% above
Iron 152 1941–2021 59%
14% of limit ↓ 91% below
Manganese 152 1941–2021 43%
5% of limit ↓ 93% below
PFHxS municipal 2 2024 0%
— —
HFPO-DA (GenX) municipal 2 2024 0%
— —
Lead 137 1990–2021 18%
1% of limit ↓ 92% below
Nitrite 25 2001–2016 24%
0% of limit ↓ 85% below
PFNA municipal 2 2024 0%
— —
PFOA municipal 2 2024 0%
— —
PFOS municipal 2 2024 0%
— —
Radon 2 2001 100%
10% of limit ↓ 73% below
Uranium 52 2001–2021 100%
20% of limit ↑ 26% above
Hardness 22 2001–2016 100%
— ↑ 97% above
PFBS municipal 2 2024 0%
— —
pH 24 2001–2016 100%
— ~ typical
Sodium 22 2001–2016 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 Yoakum County

Of the 137 arsenic tests on record for Yoakum County (1990–2021), 5% found none, and half were below 12.3 µg/L.

Of the 22 chloride tests on record for Yoakum County (2001–2016), 0% found none, and half were below 131 mg/L.

Of the 218 fluoride tests on record for Yoakum County (1941–2021), 0% found none, and half were below 3.06 mg/L.

Of the 152 iron tests on record for Yoakum County (1941–2021), 41% found none, and half were below 13.6 µg/L.

Of the 137 lead tests on record for Yoakum County (1990–2021), 82% found none.

Of the 152 manganese tests on record for Yoakum County (1941–2021), 57% found none.

Of the 50 nitrate tests on record for Yoakum County (1990–2016), 0% found none, and half were below 3.44 mg/L.

Of the 22 sulfate tests on record for Yoakum County (2001–2016), 0% found none, and half were below 226 mg/L.

Of the 52 uranium tests on record for Yoakum County (2001–2021), 0% found none, and half were below 5.87 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Arsenic 137 samples
  • Sulfate 22 samples
  • Fluoride 218 samples
  • Nitrate 50 samples
  • Chloride 22 samples
  • Iron 152 samples
  • Manganese 152 samples
  • Lead 137 samples
  • Nitrite 25 samples
  • Uranium 52 samples
  • Hardness 22 samples
  • pH 24 samples
  • Sodium 22 samples

Limited data (<15 samples) — interpret with caution

  • Radon 2 samples

No private-well PFAS data for Yoakum County

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

5 Active public water systems
6,975 Residents on public water
31% Households on private wells

Public water systems in Yoakum 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 Yoakum 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 Yoakum County Prevalence TX Average Source Year
Arsenic Cancer prevalence 5.1% 6.1% 2020
Arsenic Kidney disease rate 3.1% 3.3% 2020

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