Full contaminant data, sample history, and sourcing for Accomack County. For readers who want to go beyond the summary.
Contaminant Data — All Analytes
957 well testing events on record, covering
19 analytes.
Data spans 1906 to 2026.
Contaminant
Samples
Years
Detection Rate
Distribution LowModHigh
vs. Limit
vs. VA Avg
Iron
135
1906–2023
70%
13% of limit
↓ 89% below
Manganese
81
1987–2023
57%
89% of limit
↓ 28% below
Chloride
178
1906–2026
100%
10% of limit
↑ 169% above
Nitrate
104
1906–2026
88%
2% of limit
↓ 45% below
Arsenic
52
1988–2023
48%
10% of limit
↑ 233% above
Sulfate
147
1906–2026
94%
3% of limit
↓ 51% below
PFNA
municipal
12
2024–2025
0%
—
—
HFPO-DA (GenX)
municipal
12
2024–2025
0%
—
—
Uranium
40
1998–2023
35%
0% of limit
↓ 81% below
Nitrite
54
1975–2026
41%
1% of limit
~ typical
PFHxS
municipal
12
2024–2025
0%
—
—
Fluoride
146
1948–2026
71%
5% of limit
~ typical
Radon
24
1988–2012
79%
8% of limit
↓ 38% below
Lead
52
1988–2023
23%
1% of limit
↓ 45% below
PFOS
municipal
12
2024–2025
0%
—
—
Sodium
147
1906–2026
100%
—
↑ 36% above
pH
184
1948–2023
100%
—
~ typical
PFBS
municipal
12
2024–2025
0%
—
—
Hardness
147
1906–2026
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 VA.
Compare your result with Accomack County
Of the 52 arsenic tests on record for Accomack County (1988–2023),
52% found none.
Of the 178 chloride tests on record for Accomack County (1906–2026),
0% found none, and half were below 24 mg/L.
Of the 146 fluoride tests on record for Accomack County (1948–2026),
29% found none, and half were below 100 µg/L.
Of the 135 iron tests on record for Accomack County (1906–2023),
30% found none, and half were below 10 µg/L.
Of the 52 lead tests on record for Accomack County (1988–2023),
77% found none.
Of the 81 manganese tests on record for Accomack County (1987–2023),
43% found none, and half were below 7.89 µg/L.
Of the 104 nitrate tests on record for Accomack County (1906–2026),
12% found none, and half were below 135 µg/L.
Of the 147 sulfate tests on record for Accomack County (1906–2026),
6% found none, and half were below 6.4 mg/L.
Of the 40 uranium tests on record for Accomack County (1998–2023),
65% found none.
Data Coverage & Gaps
Well-sampled analytes (15+ samples)
Iron 135 samples
Manganese 81 samples
Chloride 178 samples
Nitrate 104 samples
Arsenic 52 samples
Sulfate 147 samples
Uranium 40 samples
Nitrite 54 samples
Fluoride 146 samples
Radon 24 samples
Lead 52 samples
Sodium 147 samples
pH 184 samples
Hardness 147 samples
No private-well PFAS data for Accomack County
We have no private well sampling data for PFAS compounds (PFOA, PFOS, PFNA, and related chemicals) in Accomack 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 Accomack 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 Accomack 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 Accomack County. Census data explorer →
USGS Aquifer Atlas — principal aquifer type underlying Accomack 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 Accomack County, used in contamination risk scoring. TRI Explorer →
EPA Superfund NPL — National Priorities List sites in or near Accomack 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 VA with at least one sample for that analyte.