Data & Methodology — Shawano County

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

Contaminant Data — All Analytes

149 well testing events on record, covering 20 analytes. Data spans 1962 to 2023.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. WI Avg
Manganese 84 1962–2023 64%
129% of limit ~ typical
Iron 102 1962–2023 85%
27% of limit ↓ 89% below
Nitrate 58 1976–2015 66%
12% of limit ↓ 29% below
Lead 64 1976–2023 22%
33% of limit ↑ 3259% above
Arsenic 61 1976–2023 52%
4% of limit ↓ 71% below
Uranium 31 1994–2023 97%
6% of limit ↑ 138% above
Nitrite 59 1962–2015 37%
1% of limit ~ typical
Chloride 122 1962–2023 100%
2% of limit ↓ 64% below
Fluoride 104 1976–2023 95%
5% of limit ~ typical
HFPO-DA (GenX) municipal 20 2022–2023 0%
— —
PFHxS municipal 20 2022–2023 5%
2% of limit ↓ 84% below
PFNA municipal 20 2022–2023 5%
13% of limit ↑ 323% above
PFOA municipal 20 2022–2023 10%
52% of limit ↑ 241% above
PFOS municipal 20 2022–2023 0%
— —
Radon 9 1993–2003 100%
15% of limit ~ typical
Sulfate 127 1962–2023 99%
5% of limit ↓ 32% below
Hardness 127 1962–2023 100%
— ~ typical
PFBS municipal 20 2022–2023 5%
— ↑ 663% above
pH 138 1962–2023 100%
— ~ typical
Sodium 126 1976–2023 100%
— ↓ 68% 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 Shawano County

Of the 61 arsenic tests on record for Shawano County (1976–2023), 48% found none, and half were below 0.2 µg/L.

Of the 122 chloride tests on record for Shawano County (1962–2023), 0% found none, and half were below 4.05 mg/L.

Of the 104 fluoride tests on record for Shawano County (1976–2023), 5% found none, and half were below 200 µg/L.

Of the 102 iron tests on record for Shawano County (1962–2023), 15% found none, and half were below 47.5 µg/L.

Of the 64 lead tests on record for Shawano County (1976–2023), 78% found none.

Of the 84 manganese tests on record for Shawano County (1962–2023), 36% found none, and half were below 20 µg/L.

Of the 58 nitrate tests on record for Shawano County (1976–2015), 34% found none, and half were below 200 µg/L.

Of the 127 sulfate tests on record for Shawano County (1962–2023), 1% found none, and half were below 12 mg/L.

Of the 31 uranium tests on record for Shawano County (1994–2023), 3% found none, and half were below 1.68 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Manganese 84 samples
  • Iron 102 samples
  • Nitrate 58 samples
  • Lead 64 samples
  • Arsenic 61 samples
  • Uranium 31 samples
  • Nitrite 59 samples
  • Chloride 122 samples
  • Fluoride 104 samples
  • HFPO-DA (GenX) 20 samples
  • PFHxS 20 samples
  • PFNA 20 samples
  • PFOA 20 samples
  • PFOS 20 samples
  • Sulfate 127 samples
  • Hardness 127 samples
  • PFBS 20 samples
  • pH 138 samples
  • Sodium 126 samples

Limited data (<15 samples) — interpret with caution

  • Radon 9 samples

CDC Health Outcome Correlations

Where contaminants detected in Shawano 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 Shawano County Prevalence WI Average Source Year
Arsenic Cancer prevalence 6.1% 7.0% 2020
Arsenic Kidney disease rate 3.5% 2.9% 2020
Lead Heart disease rate 8.1% 6.5% 2020

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