Data & Methodology — Miller County

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

Contaminant Data — All Analytes

82 well testing events on record, covering 16 analytes. Data spans 1958 to 2023.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. GA Avg
Nitrate 51 1958–2015 98%
11% of limit ↑ 67% above
Manganese 50 1977–2023 56%
2% of limit ↓ 97% below
Iron 51 1977–2023 31%
5% of limit ↓ 88% below
Nitrite 46 1977–2015 33%
2% of limit ↑ 100% above
Fluoride 57 1958–2023 53%
2% of limit ↓ 50% below
Fluoride 57 1958–2023 53%
2% of limit ↓ 50% below
Nitrite 46 1977–2015 33%
2% of limit ↑ 100% above
Chloride 60 1958–2023 100%
1% of limit ↓ 32% below
Arsenic 26 1977–2023 23%
0% of limit ↓ 92% below
Lead 27 1977–2023 52%
1% of limit ↓ 46% below
Sulfate 57 1958–2023 100%
0% of limit ↓ 84% below
Radon 10 1993–2002 100%
8% of limit ↓ 56% below
Uranium 24 1995–2023 96%
0% of limit ↓ 57% below
Hardness 57 1958–2023 100%
— ↑ 71% above
Sodium 57 1958–2023 100%
— ↓ 70% below
pH 78 1958–2023 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 GA.

Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Nitrate 51 samples
  • Manganese 50 samples
  • Iron 51 samples
  • Nitrite 46 samples
  • Fluoride 57 samples
  • Fluoride 57 samples
  • Nitrite 46 samples
  • Chloride 60 samples
  • Arsenic 26 samples
  • Lead 27 samples
  • Sulfate 57 samples
  • Uranium 24 samples
  • Hardness 57 samples
  • Sodium 57 samples
  • pH 78 samples

Limited data (<15 samples) — interpret with caution

  • Radon 10 samples

No private-well PFAS data for Miller County

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

Public vs. Private Water in Miller County

1 Active public water systems
1,998 Residents on public water

Public water systems in Miller 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 Miller 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 Miller County Prevalence GA Average Source Year
Nitrate Cancer prevalence 5.8% 6.3% 2020

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

Last updated: 2026-08-03

Full methodology →