Data & Methodology — Langlade County

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

Contaminant Data — All Analytes

90 well testing events on record, covering 20 analytes. Data spans 1967 to 2025.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. WI Avg
Manganese 82 1970–2023 60%
80% of limit ↓ 41% below
Iron 82 1970–2023 61%
17% of limit ↓ 93% below
PFOS municipal 10 2022–2025 20%
113% of limit ↑ 91% above
Nitrate 76 1970–2014 71%
29% of limit ↑ 72% above
Arsenic 26 1976–2023 96%
10% of limit ↓ 35% below
Chloride 82 1970–2023 100%
1% of limit ↓ 73% below
Fluoride 81 1970–2023 85%
5% of limit ~ typical
HFPO-DA (GenX) municipal 10 2022–2025 0%
— —
Lead 26 1976–2023 31%
0% of limit ↓ 51% below
Nitrite 70 1975–2014 14%
4% of limit ↑ 265% above
PFHxS municipal 10 2022–2025 30%
29% of limit ↑ 110% above
PFNA municipal 10 2022–2025 10%
1% of limit ↓ 53% below
PFOA municipal 10 2022–2025 30%
46% of limit ↑ 205% above
Radon 1 2003 100%
8% of limit ↓ 52% below
Sulfate 82 1970–2023 93%
3% of limit ↓ 61% below
Uranium 15 1994–2023 100%
5% of limit ↑ 118% above
Hardness 82 1970–2023 100%
— ↓ 34% below
PFBS municipal 10 2022–2025 30%
— ~ typical
pH 83 1970–2023 100%
— ~ typical
Sodium 82 1970–2023 100%
— ↓ 65% 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 WI.

Compare your result with Langlade County

Of the 26 arsenic tests on record for Langlade County (1976–2023), 4% found none, and half were below 0.7 µg/L.

Of the 82 chloride tests on record for Langlade County (1970–2023), 0% found none, and half were below 3.1 mg/L.

Of the 81 fluoride tests on record for Langlade County (1970–2023), 15% found none, and half were below 150 µg/L.

Of the 82 iron tests on record for Langlade County (1970–2023), 39% found none, and half were below 9.25 µg/L.

Of the 26 lead tests on record for Langlade County (1976–2023), 69% found none.

Of the 82 manganese tests on record for Langlade County (1970–2023), 40% found none, and half were below 1.38 µg/L.

Of the 76 nitrate tests on record for Langlade County (1970–2014), 29% found none, and half were below 460 µg/L.

Of the 82 sulfate tests on record for Langlade County (1970–2023), 7% found none, and half were below 6.5 mg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Manganese 82 samples
  • Iron 82 samples
  • Nitrate 76 samples
  • Arsenic 26 samples
  • Chloride 82 samples
  • Fluoride 81 samples
  • Lead 26 samples
  • Nitrite 70 samples
  • Sulfate 82 samples
  • Uranium 15 samples
  • Hardness 82 samples
  • pH 83 samples
  • Sodium 82 samples

Limited data (<15 samples) — interpret with caution

  • PFOS 10 samples
  • HFPO-DA (GenX) 10 samples
  • PFHxS 10 samples
  • PFNA 10 samples
  • PFOA 10 samples
  • Radon 1 sample
  • PFBS 10 samples

CDC Health Outcome Correlations

Where contaminants detected in Langlade 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 Langlade County Prevalence WI Average Source Year
Lead Heart disease rate 6.0% 6.5% 2020
Nitrate Cancer prevalence 8.9% 7.0% 2020

Source: CDC PLACES county-level estimates. Raw data: Download Langlade 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 WI with at least one sample for that analyte.

Last updated: 2026-07-15

Full methodology →