Data & Methodology — Waupaca County

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

Contaminant Data — All Analytes

109 well testing events on record, covering 20 analytes. Data spans 1946 to 2025.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. WI Avg
Radon 2 2003–2013 100%
128% of limit ↑ 671% above
Nitrate 45 1958–2014 89%
77% of limit ↑ 357% above
Iron 96 1946–2023 67%
17% of limit ↓ 93% below
Manganese 95 1946–2023 87%
0% of limit ↓ 100% below
Arsenic 31 1976–2023 84%
4% of limit ↓ 74% below
PFOS municipal 40 2022–2024 10%
67% of limit ~ typical
Chloride 95 1946–2023 100%
3% of limit ↓ 29% below
Fluoride 92 1946–2023 77%
5% of limit ~ typical
HFPO-DA (GenX) municipal 40 2022–2024 0%
— —
Lead 31 1976–2023 45%
1% of limit ↓ 47% below
Nitrite 37 1975–2014 27%
1% of limit ↑ 22% above
PFHxS municipal 40 2022–2024 8%
3% of limit ↓ 77% below
PFNA municipal 40 2022–2024 2%
8% of limit ↑ 142% above
PFOA municipal 40 2022–2024 5%
10% of limit ↓ 32% below
Sulfate 95 1946–2023 100%
6% of limit ~ typical
Uranium 35 1994–2023 91%
2% of limit ~ typical
Hardness 96 1946–2023 100%
— ~ typical
PFBS municipal 40 2022–2024 22%
— ↑ 167% above
pH 98 1946–2023 100%
— ~ typical
Sodium 47 1960–2023 100%
— ↓ 49% 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 Waupaca County

Of the 31 arsenic tests on record for Waupaca County (1976–2023), 16% found none, and half were below 0.37 µg/L.

Of the 95 chloride tests on record for Waupaca County (1946–2023), 0% found none, and half were below 8 mg/L.

Of the 92 fluoride tests on record for Waupaca County (1946–2023), 23% found none, and half were below 160 µg/L.

Of the 96 iron tests on record for Waupaca County (1946–2023), 33% found none.

Of the 31 lead tests on record for Waupaca County (1976–2023), 55% found none.

Of the 95 manganese tests on record for Waupaca County (1946–2023), 13% found none.

Of the 45 nitrate tests on record for Waupaca County (1958–2014), 11% found none, and half were below 4.17 mg/L.

Of the 95 sulfate tests on record for Waupaca County (1946–2023), 0% found none, and half were below 14.6 mg/L.

Of the 35 uranium tests on record for Waupaca County (1994–2023), 9% found none, and half were below 0.559 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Nitrate 45 samples
  • Iron 96 samples
  • Manganese 95 samples
  • Arsenic 31 samples
  • PFOS 40 samples
  • Chloride 95 samples
  • Fluoride 92 samples
  • HFPO-DA (GenX) 40 samples
  • Lead 31 samples
  • Nitrite 37 samples
  • PFHxS 40 samples
  • PFNA 40 samples
  • PFOA 40 samples
  • Sulfate 95 samples
  • Uranium 35 samples
  • Hardness 96 samples
  • PFBS 40 samples
  • pH 98 samples
  • Sodium 47 samples

Limited data (<15 samples) — interpret with caution

  • Radon 2 samples

CDC Health Outcome Correlations

Where contaminants detected in Waupaca 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 Waupaca County Prevalence WI Average Source Year
Arsenic Cancer prevalence 8.1% 7.0% 2020
Arsenic Kidney disease rate 3.3% 2.9% 2020

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