Data & Methodology — Tuscarawas County

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

Contaminant Data — All Analytes

314 well testing events on record, covering 22 analytes. Data spans 1955 to 2019.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. OH Avg
Manganese 248 1972–2019 98%
909% of limit ↑ 415% above
Iron 256 1972–2019 99%
167% of limit ↓ 62% below
Sulfate 141 1972–2019 99%
534% of limit ↑ 1114% above
Fluoride 195 1972–2019 63%
5% of limit ↓ 50% below
Lead 253 1972–2019 38%
0% of limit ↓ 100% below
Arsenic 240 1977–2019 53%
20% of limit ↑ 27% above
Chloride 258 1972–2019 94%
10% of limit ↓ 36% below
HFPO-DA (GenX) municipal 12 2023–2025 0%
— —
Nitrate 168 1972–2019 43%
3% of limit ↓ 44% below
Nitrite 144 1973–2019 44%
1% of limit ↑ 57% above
PFHxS municipal 12 2023–2025 0%
— —
PFNA municipal 13 2013–2025 0%
— —
PFOA municipal 14 2013–2025 0%
— —
PFOS municipal 12 2023–2025 0%
— —
Radon 5 2006–2019 100%
7% of limit ↓ 70% below
Uranium 5 2006–2019 100%
1% of limit ↓ 59% below
E. coli 2 2006–2019 0%
— —
Hardness 199 1972–2019 100%
— ~ typical
PFBS municipal 12 2023–2025 0%
— —
pH 239 1972–2019 100%
— ~ typical
Sodium 259 1972–2019 100%
— ↓ 61% below
Total Coliform 2 2006–2019 40%
— ~ 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 OH.

Compare your result with Tuscarawas County

Of the 240 arsenic tests on record for Tuscarawas County (1977–2019), 47% found none.

Of the 258 chloride tests on record for Tuscarawas County (1972–2019), 6% found none, and half were below 23 mg/L.

Of the 195 fluoride tests on record for Tuscarawas County (1972–2019), 37% found none.

Of the 256 iron tests on record for Tuscarawas County (1972–2019), 1% found none, and half were below 498 µg/L.

Of the 253 lead tests on record for Tuscarawas County (1972–2019), 62% found none.

Of the 248 manganese tests on record for Tuscarawas County (1972–2019), 2% found none, and half were below 443 µg/L.

Of the 168 nitrate tests on record for Tuscarawas County (1972–2019), 57% found none.

Of the 141 sulfate tests on record for Tuscarawas County (1972–2019), 1% found none, and half were below 1320 mg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Manganese 248 samples
  • Iron 256 samples
  • Sulfate 141 samples
  • Fluoride 195 samples
  • Lead 253 samples
  • Arsenic 240 samples
  • Chloride 258 samples
  • Nitrate 168 samples
  • Nitrite 144 samples
  • Hardness 199 samples
  • pH 239 samples
  • Sodium 259 samples

Limited data (<15 samples) — interpret with caution

  • PFNA 13 samples
  • PFOA 14 samples
  • Radon 5 samples
  • Uranium 5 samples
  • E. coli 2 samples
  • Total Coliform 2 samples

Public vs. Private Water in Tuscarawas County

80 Active public water systems
72,418 Residents on public water
33% Households on private wells

Public water systems in Tuscarawas 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 Tuscarawas 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 Tuscarawas County Prevalence OH Average Source Year
Radon Cancer prevalence 7.8% 6.8% 2020
Lead Heart disease rate 8.8% 7.6% 2020

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