Data & Methodology — Greene County

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

Contaminant Data — All Analytes

324 well testing events on record, covering 22 analytes. Data spans 1961 to 2023.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. OH Avg
Iron 236 1972–2020 90%
547% of limit ↑ 25% above
Manganese 225 1972–2020 80%
326% of limit ↑ 85% above
PFOS municipal 29 2023–2025 28%
278% of limit ↑ 38% above
PFHxS municipal 29 2023–2025 34%
130% of limit ↑ 145% above
PFOA municipal 29 2023–2025 14%
135% of limit ~ typical
Radon 11 1999–2001 100%
8% of limit ↓ 65% below
Chloride 257 1972–2020 100%
10% of limit ↓ 34% below
Arsenic 194 1978–2020 79%
20% of limit ↑ 27% above
Nitrate 114 1972–2020 64%
4% of limit ~ typical
Lead 192 1974–2020 63%
0% of limit ↓ 100% below
Fluoride 157 1972–2020 78%
5% of limit ↓ 51% below
HFPO-DA (GenX) municipal 29 2023–2025 0%
— —
Nitrite 87 1974–2020 20%
1% of limit ~ typical
PFNA municipal 29 2023–2025 0%
— —
Sulfate 105 1972–2020 100%
15% of limit ↓ 67% below
Uranium 34 1999–2020 76%
3% of limit ~ typical
Total Coliform 3 2002–2019 39%
— ~ typical
Sodium 240 1972–2020 100%
— ↓ 67% below
pH 210 1972–2020 100%
— ~ typical
PFBS municipal 29 2023–2025 34%
— ↑ 52% above
Hardness 220 1972–2020 100%
— ~ typical
E. coli 3 2002–2019 23%
— ~ 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 Greene County

Of the 194 arsenic tests on record for Greene County (1978–2020), 21% found none, and half were below 0.1 µg/L.

Of the 257 chloride tests on record for Greene County (1972–2020), 0% found none, and half were below 25 mg/L.

Of the 157 fluoride tests on record for Greene County (1972–2020), 22% found none, and half were below 180 µg/L.

Of the 236 iron tests on record for Greene County (1972–2020), 10% found none, and half were below 1.27 mg/L.

Of the 192 lead tests on record for Greene County (1974–2020), 37% found none.

Of the 225 manganese tests on record for Greene County (1972–2020), 20% found none, and half were below 110 µg/L.

Of the 114 nitrate tests on record for Greene County (1972–2020), 36% found none, and half were below 22.5 µg/L.

Of the 105 sulfate tests on record for Greene County (1972–2020), 0% found none, and half were below 36.4 mg/L.

Of the 34 uranium tests on record for Greene County (1999–2020), 24% found none, and half were below 0.652 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 236 samples
  • Manganese 225 samples
  • Chloride 257 samples
  • Arsenic 194 samples
  • Nitrate 114 samples
  • Lead 192 samples
  • Fluoride 157 samples
  • Nitrite 87 samples
  • Sulfate 105 samples
  • Uranium 34 samples
  • Sodium 240 samples
  • pH 210 samples
  • Hardness 220 samples

Limited data (<15 samples) — interpret with caution

  • Radon 11 samples
  • Total Coliform 3 samples
  • E. coli 3 samples

No private-well PFAS data for Greene County

We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Greene County. PFAS has been detected in local public water systems (UCMR 5 data) — indicated by the "municipal" badge in the table above — but this does not directly indicate private well contamination. PFAS testing for private wells requires a dedicated lab panel (~$300–$500). If you are near a military base, airport, or industrial site, consider testing proactively. Learn more about PFAS →

Public vs. Private Water in Greene County

56 Active public water systems
180,062 Residents on public water
26% Households on private wells

Public water systems in Greene 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 Greene 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 Greene County Prevalence OH Average Source Year
Arsenic Cancer prevalence 6.0% 6.8% 2020
Arsenic Kidney disease rate 2.5% 3.1% 2020
Lead Heart disease rate 5.8% 7.6% 2020

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