Full contaminant data, sample history, and sourcing for Pike County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
195 well testing events on record, covering
22 analytes.
Data spans 1965 to 2019.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. OH Avg
Manganese
158
1978–2019
84%
760% of limit
↑ 330% above
Iron
158
1978–2019
85%
445% of limit
~ typical
Chloride
163
1972–2019
100%
13% of limit
~ typical
Arsenic
65
1980–2019
100%
40% of limit
↑ 154% above
Nitrate
103
1972–2019
70%
11% of limit
↑ 135% above
Fluoride
46
1972–2019
83%
3% of limit
↓ 67% below
HFPO-DA (GenX)
municipal
4
2024–2025
0%
—
—
Lead
62
1981–2019
87%
0% of limit
↓ 100% below
Nitrite
93
1991–2019
22%
2% of limit
↑ 214% above
PFHxS
municipal
4
2024–2025
0%
—
—
PFNA
municipal
4
2024–2025
25%
53% of limit
↑ 23% above
PFOA
municipal
4
2024–2025
0%
—
—
PFOS
municipal
4
2024–2025
0%
—
—
Radon
1
2019
100%
58% of limit
↑ 161% above
Sulfate
105
1972–2019
98%
27% of limit
↓ 39% below
Uranium
1
2019
100%
3% of limit
~ typical
E. coli
1
2019
0%
—
—
Hardness
137
1972–2019
100%
—
~ typical
PFBS
municipal
4
2024–2025
0%
—
—
pH
148
1972–2019
100%
—
~ typical
Sodium
165
1972–2019
100%
—
↓ 44% below
Total Coliform
1
2019
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 OH.
Compare your result with Pike County
Of the 65 arsenic tests on record for Pike County (1980–2019),
0% found none, and half were below 4 µg/L.
Of the 163 chloride tests on record for Pike County (1972–2019),
0% found none, and half were below 32 mg/L.
Of the 46 fluoride tests on record for Pike County (1972–2019),
17% found none, and half were below 105 µg/L.
Of the 158 iron tests on record for Pike County (1978–2019),
15% found none, and half were below 1.12 mg/L.
Of the 62 lead tests on record for Pike County (1981–2019),
13% found none.
Of the 158 manganese tests on record for Pike County (1978–2019),
16% found none, and half were below 340 µg/L.
Of the 103 nitrate tests on record for Pike County (1972–2019),
30% found none, and half were below 230 µg/L.
Of the 105 sulfate tests on record for Pike County (1972–2019),
2% found none, and half were below 66 mg/L.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Manganese 158 samples
Iron 158 samples
Chloride 163 samples
Arsenic 65 samples
Nitrate 103 samples
Fluoride 46 samples
Lead 62 samples
Nitrite 93 samples
Sulfate 105 samples
Hardness 137 samples
pH 148 samples
Sodium 165 samples
Limited data (<15 samples) — interpret with caution
Radon 1 sample
Uranium 1 sample
E. coli 1 sample
Total Coliform 1 sample
No private-well PFAS data for Pike County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Pike 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 Pike County
15Active public water systems
28,449Residents on public water
9%Households on private wells
Public water systems in Pike 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 Pike 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 Pike 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 Pike County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Pike 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 Pike County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Pike 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 OH with at least one sample for that analyte.