Data & Methodology — Tioga County

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

Contaminant Data — All Analytes

65 well testing events on record, covering 23 analytes. Data spans 1953 to 2023.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. NY Avg
Radon 15 2004–2019 100%
197% of limit ↑ 77% above
Manganese 33 1967–2019 61%
376% of limit ↑ 22% above
Iron 33 1967–2019 73%
69% of limit ↓ 64% below
PFOA municipal 14 2023–2025 29%
116% of limit ↓ 22% below
Chloride 37 1966–2019 100%
10% of limit ↓ 66% below
Arsenic 27 1972–2019 74%
10% of limit ↓ 48% below
Fluoride 34 1967–2019 94%
4% of limit ↓ 33% below
HFPO-DA (GenX) municipal 14 2023–2025 0%
— —
Lead 27 1972–2019 67%
2% of limit ↓ 63% below
Nitrate 33 1967–2019 79%
11% of limit ~ typical
Nitrite 22 1974–2019 23%
1% of limit ↓ 27% below
PFHxS municipal 14 2023–2025 0%
— —
PFNA municipal 14 2023–2025 0%
— —
PFOS municipal 14 2023–2025 0%
— —
Sulfate 34 1967–2019 97%
7% of limit ↓ 47% below
Uranium 20 2004–2019 80%
0% of limit ↓ 81% below
E. coli 3 2004–2019 0%
— —
Fecal Coliform 3 2004–2019 29%
— ~ typical
Hardness 35 1966–2019 100%
— ↓ 21% below
PFBS municipal 14 2023–2025 0%
— —
pH 56 1966–2019 100%
— ~ typical
Sodium 35 1966–2019 100%
— ↓ 66% below
Total Coliform 3 2004–2019 14%
— ~ 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 NY.

Compare your result with Tioga County

Of the 27 arsenic tests on record for Tioga County (1972–2019), 26% found none, and half were below 0.48 µg/L.

Of the 37 chloride tests on record for Tioga County (1966–2019), 0% found none, and half were below 25 mg/L.

Of the 34 fluoride tests on record for Tioga County (1967–2019), 6% found none, and half were below 145 µg/L.

Of the 33 iron tests on record for Tioga County (1967–2019), 27% found none, and half were below 30 µg/L.

Of the 27 lead tests on record for Tioga County (1972–2019), 33% found none, and half were below 90 ng/L.

Of the 33 manganese tests on record for Tioga County (1967–2019), 39% found none, and half were below 2.2 µg/L.

Of the 33 nitrate tests on record for Tioga County (1967–2019), 21% found none, and half were below 160 µg/L.

Of the 34 sulfate tests on record for Tioga County (1967–2019), 3% found none, and half were below 18 mg/L.

Of the 20 uranium tests on record for Tioga County (2004–2019), 20% found none, and half were below 94 ng/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Radon 15 samples
  • Manganese 33 samples
  • Iron 33 samples
  • Chloride 37 samples
  • Arsenic 27 samples
  • Fluoride 34 samples
  • Lead 27 samples
  • Nitrate 33 samples
  • Nitrite 22 samples
  • Sulfate 34 samples
  • Uranium 20 samples
  • Hardness 35 samples
  • pH 56 samples
  • Sodium 35 samples

Limited data (<15 samples) — interpret with caution

  • E. coli 3 samples
  • Fecal Coliform 3 samples
  • Total Coliform 3 samples

No private-well PFAS data for Tioga County

We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Tioga County. 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 →

CDC Health Outcome Correlations

Where contaminants detected in Tioga 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 Tioga County Prevalence NY Average Source Year
Lead Heart disease rate 7.8% 6.4% 2020
Arsenic Cancer prevalence 8.3% 6.7% 2020
Arsenic Kidney disease rate 3.3% 2.9% 2020

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

Last updated: 2026-08-04

Full methodology →