Data & Methodology — Huron County

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

Contaminant Data — All Analytes

117 well testing events on record, covering 20 analytes. Data spans 1967 to 2019.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. MI Avg
Iron 77 1980–2004 97%
161% of limit ↓ 55% below
Arsenic 80 1980–1998 88%
245% of limit ↑ 715% above
Manganese 75 1980–1998 96%
72% of limit ~ typical
Sulfate 75 1980–1998 99%
11% of limit ↓ 49% below
Chloride 75 1980–1998 99%
3% of limit ↓ 85% below
Radon 33 1988–1991 67%
52% of limit ↑ 634% above
Fluoride 75 1980–1998 99%
19% of limit ↑ 132% above
HFPO-DA (GenX) municipal 4 2024 0%
— —
Lead 53 1980–1997 0%
— —
Nitrate 43 1980–2004 16%
0% of limit ↓ 85% below
Nitrite 41 1980–1998 17%
1% of limit ~ typical
PFHxS municipal 4 2024 0%
— —
PFNA municipal 9 2010–2024 0%
— —
PFOA municipal 13 2010–2024 0%
— —
PFOS municipal 4 2024 0%
— —
Uranium 18 1980–1997 17%
0% of limit ↓ 61% below
Sodium 75 1980–1998 100%
— ~ typical
pH 91 1980–2004 100%
— ~ typical
PFBS municipal 4 2024 0%
— —
Hardness 75 1980–1998 99%
— ~ 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 MI.

Compare your result with Huron County

Of the 80 arsenic tests on record for Huron County (1980–1998), 12% found none, and half were below 15 µg/L.

Of the 75 chloride tests on record for Huron County (1980–1998), 1% found none, and half were below 6.7 mg/L.

Of the 75 fluoride tests on record for Huron County (1980–1998), 1% found none, and half were below 770 µg/L.

Of the 77 iron tests on record for Huron County (1980–2004), 3% found none, and half were below 460 µg/L.

Of the 53 lead tests on record for Huron County (1980–1997), 100% found none.

Of the 75 manganese tests on record for Huron County (1980–1998), 4% found none, and half were below 35.2 µg/L.

Of the 43 nitrate tests on record for Huron County (1980–2004), 84% found none.

Of the 75 sulfate tests on record for Huron County (1980–1998), 1% found none, and half were below 26 mg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 77 samples
  • Arsenic 80 samples
  • Manganese 75 samples
  • Sulfate 75 samples
  • Chloride 75 samples
  • Radon 33 samples
  • Fluoride 75 samples
  • Lead 53 samples
  • Nitrate 43 samples
  • Nitrite 41 samples
  • Uranium 18 samples
  • Sodium 75 samples
  • pH 91 samples
  • Hardness 75 samples

Limited data (<15 samples) — interpret with caution

  • PFNA 9 samples
  • PFOA 13 samples

Public vs. Private Water in Huron County

104 Active public water systems
33,191 Residents on public water
47% Households on private wells

Public water systems in Huron 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 Huron 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 Huron County Prevalence MI Average Source Year
Arsenic Cancer prevalence 9.1% 7.2% 2020
Arsenic Kidney disease rate 3.9% 3.2% 2020

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

Last updated: 2026-08-04

Full methodology →