Data & Methodology — Lawrence County

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

Contaminant Data — All Analytes

73 well testing events on record, covering 22 analytes. Data spans 1972 to 2023.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. OH Avg
Manganese 55 1973–2019 100%
820% of limit ↑ 364% above
Iron 57 1973–2019 93%
266% of limit ↓ 39% below
Radon 2 2019 100%
118% of limit ↑ 436% above
PFOA municipal 16 2023–2025 31%
108% of limit ↓ 21% below
Lead 53 1973–2019 89%
0% of limit ↓ 100% below
Arsenic 48 1979–2019 85%
0% of limit ↓ 100% below
Chloride 59 1973–2019 100%
11% of limit ↓ 28% below
Fluoride 36 1973–2019 83%
2% of limit ↓ 84% below
HFPO-DA (GenX) municipal 16 2023–2025 25%
55% of limit ~ typical
Nitrate 21 1973–2019 100%
8% of limit ↑ 66% above
Nitrite 3 1974–2019 100%
1% of limit ↑ 73% above
PFHxS municipal 16 2023–2025 12%
80% of limit ↑ 50% above
PFNA municipal 16 2023–2025 0%
— —
PFOS municipal 16 2023–2025 0%
— —
Sulfate 6 2012–2019 100%
22% of limit ↓ 51% below
Uranium 2 2019 100%
1% of limit ↓ 50% below
E. coli 2 2019 0%
— —
Hardness 30 1973–2019 100%
— ↓ 68% below
PFBS municipal 16 2023–2025 25%
— ↓ 24% below
pH 29 1973–2019 100%
— ~ typical
Sodium 57 1973–2019 100%
— ↓ 44% below
Total Coliform 2 2019 0%
— —

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 Lawrence County

Of the 48 arsenic tests on record for Lawrence County (1979–2019), 15% found none.

Of the 59 chloride tests on record for Lawrence County (1973–2019), 0% found none, and half were below 27 mg/L.

Of the 36 fluoride tests on record for Lawrence County (1973–2019), 17% found none.

Of the 57 iron tests on record for Lawrence County (1973–2019), 7% found none, and half were below 718 µg/L.

Of the 53 lead tests on record for Lawrence County (1973–2019), 11% found none.

Of the 55 manganese tests on record for Lawrence County (1973–2019), 0% found none, and half were below 410 µg/L.

Of the 21 nitrate tests on record for Lawrence County (1973–2019), 0% found none, and half were below 800 µg/L.

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Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Manganese 55 samples
  • Iron 57 samples
  • Lead 53 samples
  • Arsenic 48 samples
  • Chloride 59 samples
  • Fluoride 36 samples
  • Nitrate 21 samples
  • Hardness 30 samples
  • pH 29 samples
  • Sodium 57 samples

Limited data (<15 samples) — interpret with caution

  • Radon 2 samples
  • Nitrite 3 samples
  • Sulfate 6 samples
  • Uranium 2 samples
  • E. coli 2 samples
  • Total Coliform 2 samples

No private-well PFAS data for Lawrence County

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

6 Active public water systems
61,075 Residents on public water
3% Households on private wells

Public water systems in Lawrence 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 Lawrence 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 Lawrence County Prevalence OH Average Source Year
Arsenic Cancer prevalence 7.9% 6.8% 2020
Arsenic Kidney disease rate 3.7% 3.1% 2020
Lead Heart disease rate 9.4% 7.6% 2020

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

Last updated: 2026-08-04

Full methodology →