Full contaminant data, sample history, and sourcing for Huntingdon County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
134 well testing events on record, covering
20 analytes.
Data spans 1926 to 2024.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. PA Avg
Manganese
53
1969–1994
85%
80% of limit
↓ 84% below
Radon
7
1994–2018
100%
9% of limit
↓ 93% below
Lead
15
1973–1985
27%
1000% of limit
↑ 21519% above
Iron
63
1933–1994
89%
33% of limit
↓ 94% below
PFOS
municipal
72
2023–2025
8%
412% of limit
↑ 224% above
Arsenic
13
1980–2018
15%
426% of limit
↑ 1355% above
PFOA
municipal
74
2023–2025
11%
132% of limit
↑ 42% above
Sulfate
67
1933–1994
100%
8% of limit
↓ 53% below
Chloride
68
1933–1994
100%
1% of limit
↓ 89% below
Fluoride
62
1969–1994
73%
2% of limit
↓ 44% below
HFPO-DA (GenX)
municipal
55
2023–2025
0%
—
—
Nitrate
70
1933–2018
99%
4% of limit
↓ 76% below
Nitrite
66
1973–2018
14%
1% of limit
↓ 33% below
PFHxS
municipal
16
2023–2024
0%
—
—
PFNA
municipal
16
2023–2024
0%
—
—
Uranium
3
1994
33%
5% of limit
↑ 103% above
Sodium
60
1933–1994
98%
—
↓ 75% below
pH
78
1969–2019
100%
—
~ typical
PFBS
municipal
55
2023–2025
0%
—
—
Hardness
68
1933–1994
100%
—
↓ 25% below
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 Huntingdon County
Of the 68 chloride tests on record for Huntingdon County (1933–1994),
0% found none, and half were below 3 mg/L.
Of the 62 fluoride tests on record for Huntingdon County (1969–1994),
27% found none, and half were below 100 µg/L.
Of the 63 iron tests on record for Huntingdon County (1933–1994),
11% found none, and half were below 80 µg/L.
Of the 53 manganese tests on record for Huntingdon County (1969–1994),
15% found none, and half were below 30 µg/L.
Of the 70 nitrate tests on record for Huntingdon County (1933–2018),
1% found none, and half were below 324 µg/L.
Of the 58 pfoa tests on record for Huntingdon County (2025),
86% found none.
Of the 56 pfos tests on record for Huntingdon County (2025),
89% found none.
Of the 67 sulfate tests on record for Huntingdon County (1933–1994),
0% found none, and half were below 20 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Manganese 53 samples
Lead 15 samples
Iron 63 samples
PFOS 72 samples
PFOA 74 samples
Sulfate 67 samples
Chloride 68 samples
Fluoride 62 samples
HFPO-DA (GenX) 55 samples
Nitrate 70 samples
Nitrite 66 samples
Sodium 60 samples
pH 78 samples
PFBS 55 samples
Hardness 68 samples
Limited data (<15 samples) — interpret with caution
Radon 7 samples
Arsenic 13 samples
Uranium 3 samples
Public vs. Private Water in Huntingdon County
91Active public water systems
40,685Residents on public water
56%Households on private wells
Public water systems in Huntingdon 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 Huntingdon 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.
This report aggregates data from the following public databases:
Water Quality Portal (WQP) — groundwater sample results for Huntingdon County from EPA, USGS, and state agencies. Browse WQP data →
EPA Safe Drinking Water Information System (SDWIS) — public water system inventory used to estimate the share of residents on private wells. Browse SDWIS →
Census ACS 5-Year Estimates — well and cistern household counts (variable DP04_0074E) used to calculate the private-well percentage for Huntingdon County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Huntingdon County, which informs which contaminants are geologically likely. USGS Aquifer Atlas →
EPA UCMR 5 (2023–2025) — PFAS occurrence data from public water systems, used as a proxy indicator for aquifer PFAS exposure. Rows marked "municipal" in the table above come from this source. About UCMR 5 →
EPA Toxics Release Inventory (TRI) — industrial facility chemical releases near Huntingdon County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Huntingdon County, used in contamination risk scoring. Superfund site search →
CDC PLACES — county-level health outcome prevalence (kidney disease, cancer, heart disease) correlated with detected contaminants. About CDC PLACES →
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.