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

77 well testing events on record, covering 20 analytes. Data spans 1926 to 2022.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. PA Avg
Iron 65 1926–1999 100%
140% of limit ↓ 76% below
Manganese 56 1973–1999 95%
40% of limit ↓ 92% below
Nitrate 16 1926–1999 75%
7% of limit ↓ 61% below
Chloride 65 1926–1999 100%
7% of limit ↓ 33% below
Sulfate 65 1926–1999 100%
13% of limit ↓ 23% below
Arsenic 17 1980–1999 94%
10% of limit ↓ 66% below
Fluoride 56 1973–1999 80%
10% of limit ↑ 124% above
HFPO-DA (GenX) municipal 12 2023–2025 0%
— —
Lead 17 1980–1999 41%
0% of limit ↓ 100% below
Nitrite 7 1973–1999 29%
1% of limit ~ typical
PFHxS municipal 8 2023–2025 0%
— —
PFNA municipal 8 2023–2025 0%
— —
PFOA municipal 12 2023–2025 17%
72% of limit ↓ 23% below
PFOS municipal 12 2023–2025 0%
— —
Radon 1 1996 100%
6% of limit ↓ 96% below
Uranium 4 1996–1999 75%
0% of limit ↓ 86% below
Sodium 65 1926–1999 100%
— ↑ 324% above
pH 56 1973–1999 100%
— ~ typical
PFBS municipal 12 2023–2025 0%
— —
Hardness 65 1926–1999 100%
— ~ 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 PA.

Compare your result with Greene County

Of the 65 chloride tests on record for Greene County (1926–1999), 0% found none, and half were below 18 mg/L.

Of the 56 fluoride tests on record for Greene County (1973–1999), 20% found none, and half were below 300 µg/L.

Of the 65 iron tests on record for Greene County (1926–1999), 0% found none, and half were below 420 µg/L.

Of the 56 manganese tests on record for Greene County (1973–1999), 5% found none, and half were below 20 µg/L.

Of the 65 sulfate tests on record for Greene County (1926–1999), 0% found none, and half were below 33 mg/L.

Have a number from your lab? Enter it to see where it falls. Nothing is sent anywhere.

Want the full picture for your well? Check all your results.

Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 65 samples
  • Manganese 56 samples
  • Nitrate 16 samples
  • Chloride 65 samples
  • Sulfate 65 samples
  • Arsenic 17 samples
  • Fluoride 56 samples
  • Lead 17 samples
  • Sodium 65 samples
  • pH 56 samples
  • Hardness 65 samples

Limited data (<15 samples) — interpret with caution

  • HFPO-DA (GenX) 12 samples
  • Nitrite 7 samples
  • PFOA 12 samples
  • PFOS 12 samples
  • Radon 1 sample
  • Uranium 4 samples
  • PFBS 12 samples

Public vs. Private Water in Greene County

9 Active public water systems
46,525 Residents on public water
31% 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 PA Average Source Year
Nitrate Cancer prevalence 6.1% 7.0% 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 PA with at least one sample for that analyte.

Last updated: 2026-08-04

Full methodology →