Data & Methodology — Crisp County

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

Contaminant Data — All Analytes

35 well testing events on record, covering 20 analytes. Data spans 1951 to 2026.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. GA Avg
Manganese 13 1971–2015 85%
10% of limit ↓ 84% below
Nitrate 26 1951–2015 100%
6% of limit ~ typical
Iron 13 1971–2015 69%
3% of limit ↓ 93% below
Sulfate 28 1951–2015 96%
1% of limit ↓ 74% below
PFOS municipal 8 2023–2024 0%
— —
PFHxS municipal 8 2023–2024 0%
— —
Lead 6 1971–2015 67%
14% of limit ↑ 798% above
Radon 2 1993–1994 100%
8% of limit ↓ 53% below
Uranium 4 1994–2015 75%
1% of limit ↑ 43% above
Sulfate 28 1951–2015 96%
1% of limit ↓ 74% below
HFPO-DA (GenX) municipal 8 2023–2024 0%
— —
Arsenic 6 1971–2015 50%
1% of limit ↓ 80% below
Chloride 29 1951–2015 100%
1% of limit ↓ 31% below
PFNA municipal 8 2023–2024 0%
— —
PFOA municipal 8 2023–2024 0%
— —
Radon 2 1993–1994 100%
8% of limit ↓ 53% below
PFBS municipal 8 2023–2024 0%
— —
Hardness 29 1951–2015 100%
— ↑ 42% above
pH 28 1951–2015 100%
— ~ typical
Sodium 26 1957–2015 100%
— ↓ 72% 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 GA.

Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Nitrate 26 samples
  • Sulfate 28 samples
  • Sulfate 28 samples
  • Chloride 29 samples
  • Hardness 29 samples
  • pH 28 samples
  • Sodium 26 samples

Limited data (<15 samples) — interpret with caution

  • Manganese 13 samples
  • Iron 13 samples
  • Lead 6 samples
  • Radon 2 samples
  • Uranium 4 samples
  • Arsenic 6 samples
  • Radon 2 samples

No private-well PFAS data for Crisp County

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

20 Active public water systems
18,550 Residents on public water

Public water systems in Crisp 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 Crisp 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 Crisp County Prevalence GA Average Source Year
Nitrate Cancer prevalence 5.6% 6.3% 2020

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