Data & Methodology — Clinton County

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

Contaminant Data — All Analytes

161 well testing events on record, covering 22 analytes. Data spans 1926 to 2024.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. PA Avg
Radon 64 2015–2023 100%
163% of limit ↑ 26% above
Manganese 100 1971–2023 72%
22% of limit ↓ 96% below
Iron 104 1934–2023 62%
53% of limit ↓ 91% below
Nitrate 115 1934–2023 83%
9% of limit ↓ 51% below
Chloride 103 1934–2023 99%
2% of limit ↓ 81% below
Arsenic 105 1977–2023 30%
10% of limit ↓ 67% below
Fluoride 101 1934–2023 70%
2% of limit ↓ 66% below
HFPO-DA (GenX) municipal 39 2024–2025 0%
— —
Lead 98 1977–2023 44%
1% of limit ↓ 68% below
Nitrite 109 1977–2023 27%
0% of limit ↓ 87% below
PFHxS municipal 8 2024 0%
— —
PFNA municipal 8 2024 0%
— —
PFOA municipal 47 2024–2025 0%
— —
PFOS municipal 47 2024–2025 2%
48% of limit ↓ 63% below
Sulfate 103 1934–2023 99%
4% of limit ↓ 76% below
Uranium 70 1997–2023 54%
1% of limit ↓ 66% below
Total Coliform 56 1998–2023 58%
— ~ typical
Sodium 102 1934–2023 100%
— ↓ 71% below
pH 118 1971–2023 100%
— ~ typical
PFBS municipal 39 2024–2025 0%
— —
Hardness 104 1934–2023 100%
— ↓ 37% below
E. coli 56 1998–2023 27%
— ~ 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 Clinton County

Of the 105 arsenic tests on record for Clinton County (1977–2023), 70% found none.

Of the 103 chloride tests on record for Clinton County (1934–2023), 1% found none, and half were below 5 mg/L.

Of the 101 fluoride tests on record for Clinton County (1934–2023), 30% found none, and half were below 30 µg/L.

Of the 104 iron tests on record for Clinton County (1934–2023), 38% found none, and half were below 72.5 µg/L.

Of the 98 lead tests on record for Clinton County (1977–2023), 56% found none.

Of the 100 manganese tests on record for Clinton County (1971–2023), 28% found none, and half were below 3.87 µg/L.

Of the 115 nitrate tests on record for Clinton County (1934–2023), 17% found none, and half were below 390 µg/L.

Of the 39 pfoa tests on record for Clinton County (2025), 100% found none.

Of the 39 pfos tests on record for Clinton County (2025), 97% found none.

Of the 103 sulfate tests on record for Clinton County (1934–2023), 1% found none, and half were below 10 mg/L.

Of the 70 uranium tests on record for Clinton County (1997–2023), 46% found none, and half were below 10 ng/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Radon 64 samples
  • Manganese 100 samples
  • Iron 104 samples
  • Nitrate 115 samples
  • Chloride 103 samples
  • Arsenic 105 samples
  • Fluoride 101 samples
  • HFPO-DA (GenX) 39 samples
  • Lead 98 samples
  • Nitrite 109 samples
  • PFOA 47 samples
  • PFOS 47 samples
  • Sulfate 103 samples
  • Uranium 70 samples
  • Total Coliform 56 samples
  • Sodium 102 samples
  • pH 118 samples
  • PFBS 39 samples
  • Hardness 104 samples
  • E. coli 56 samples

Public vs. Private Water in Clinton County

31 Active public water systems
32,517 Residents on public water
38% Households on private wells

Public water systems in Clinton 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 Clinton 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 Clinton County Prevalence PA Average Source Year
Arsenic Cancer prevalence 6.1% 7.0% 2020
Arsenic Kidney disease rate 2.8% 3.0% 2020

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