Data & Methodology — Coshocton County

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

Contaminant Data — All Analytes

278 well testing events on record, covering 18 analytes. Data spans 1954 to 2021.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. OH Avg
Iron 268 1973–2014 100%
1667% of limit ↑ 280% above
Manganese 258 1973–2014 98%
420% of limit ↑ 138% above
Sulfate 179 1976–2014 99%
22% of limit ↓ 50% below
Arsenic 212 1976–2014 87%
20% of limit ↑ 27% above
Lead 210 1976–2014 46%
0% of limit ↓ 100% below
Fluoride 218 1973–2014 94%
6% of limit ↓ 42% below
Chloride 274 1973–2014 100%
6% of limit ↓ 62% below
HFPO-DA (GenX) municipal 2 2024–2025 0%
— —
Nitrate 28 1973–1988 100%
0% of limit ↓ 99% below
Nitrite 1 1974 100%
0% of limit ↓ 52% below
PFHxS municipal 2 2024–2025 0%
— —
PFNA municipal 4 2008–2025 0%
— —
PFOA municipal 4 2008–2025 0%
— —
PFOS municipal 2 2024–2025 0%
— —
Sodium 274 1973–2014 100%
— ↓ 50% below
pH 221 1973–2005 100%
— ~ typical
PFBS municipal 2 2024–2025 0%
— —
Hardness 219 1973–2014 100%
— ↓ 48% 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 OH.

Compare your result with Coshocton County

Of the 212 arsenic tests on record for Coshocton County (1976–2014), 13% found none, and half were below 2 µg/L.

Of the 274 chloride tests on record for Coshocton County (1973–2014), 0% found none, and half were below 14.5 mg/L.

Of the 218 fluoride tests on record for Coshocton County (1973–2014), 6% found none, and half were below 210 µg/L.

Of the 268 iron tests on record for Coshocton County (1973–2014), 0% found none, and half were below 5 mg/L.

Of the 210 lead tests on record for Coshocton County (1976–2014), 54% found none.

Of the 258 manganese tests on record for Coshocton County (1973–2014), 2% found none, and half were below 205 µg/L.

Of the 28 nitrate tests on record for Coshocton County (1973–1988), 0% found none, and half were below 5 µg/L.

Of the 179 sulfate tests on record for Coshocton County (1976–2014), 1% found none, and half were below 54 mg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 268 samples
  • Manganese 258 samples
  • Sulfate 179 samples
  • Arsenic 212 samples
  • Lead 210 samples
  • Fluoride 218 samples
  • Chloride 274 samples
  • Nitrate 28 samples
  • Sodium 274 samples
  • pH 221 samples
  • Hardness 219 samples

Limited data (<15 samples) — interpret with caution

  • Nitrite 1 sample
  • PFNA 4 samples
  • PFOA 4 samples

Public vs. Private Water in Coshocton County

35 Active public water systems
21,460 Residents on public water
59% Households on private wells

Public water systems in Coshocton 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 Coshocton 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 Coshocton County Prevalence OH Average Source Year
Lead Heart disease rate 7.3% 7.6% 2020
Arsenic Cancer prevalence 7.9% 6.8% 2020
Arsenic Kidney disease rate 3.8% 3.1% 2020

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

Last updated: 2026-08-04

Full methodology →