Data & Methodology — Lucas County

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

Contaminant Data — All Analytes

2416 well testing events on record, covering 19 analytes. Data spans 1962 to 2021.

Contaminant Samples Years Detection Rate Distribution LowModHigh vs. Limit vs. OH Avg
Iron 126 1977–2005 96%
93% of limit ↓ 79% below
Sulfate 100 1978–1999 99%
23% of limit ↓ 47% below
Manganese 120 1977–2005 94%
36% of limit ↓ 80% below
Chloride 2349 1977–2005 100%
28% of limit ↑ 83% above
Lead 87 1978–2005 49%
0% of limit ↓ 100% below
Nitrate 88 1977–1999 47%
1% of limit ↓ 71% below
Arsenic 89 1987–2005 67%
0% of limit ↓ 100% below
Fluoride 120 1977–2005 84%
32% of limit ↑ 209% above
HFPO-DA (GenX) municipal 28 2023–2025 0%
— —
Nitrite 79 1987–1999 15%
1% of limit ↑ 57% above
PFHxS municipal 28 2023–2025 0%
— —
PFNA municipal 30 2010–2025 0%
— —
PFOA municipal 31 2010–2025 0%
— —
PFOS municipal 28 2023–2025 0%
— —
Uranium 26 1987 88%
1% of limit ↓ 74% below
Hardness 106 1978–2005 100%
— ~ typical
PFBS municipal 28 2023–2025 0%
— —
pH 977 1977–2005 100%
— ~ typical
Sodium 2252 1977–2005 100%
— ↓ 37% 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 OH.

Compare your result with Lucas County

Of the 89 arsenic tests on record for Lucas County (1987–2005), 33% found none.

Of the 2349 chloride tests on record for Lucas County (1977–2005), 0% found none, and half were below 69 mg/L.

Of the 120 fluoride tests on record for Lucas County (1977–2005), 16% found none, and half were below 990 µg/L.

Of the 126 iron tests on record for Lucas County (1977–2005), 4% found none, and half were below 260 µg/L.

Of the 87 lead tests on record for Lucas County (1978–2005), 51% found none.

Of the 120 manganese tests on record for Lucas County (1977–2005), 6% found none, and half were below 17 µg/L.

Of the 88 nitrate tests on record for Lucas County (1977–1999), 53% found none.

Of the 100 sulfate tests on record for Lucas County (1978–1999), 1% found none, and half were below 57 mg/L.

Of the 26 uranium tests on record for Lucas County (1987), 12% found none, and half were below 0.135 µg/L.

Have a number from your lab? Enter it to see where it falls. Nothing is sent anywhere.

Want the full picture for your well? Check all your results.

Data Coverage & Gaps

Well-sampled analytes (15+ samples)

  • Iron 126 samples
  • Sulfate 100 samples
  • Manganese 120 samples
  • Chloride 2349 samples
  • Lead 87 samples
  • Nitrate 88 samples
  • Arsenic 89 samples
  • Fluoride 120 samples
  • Nitrite 79 samples
  • PFNA 30 samples
  • PFOA 31 samples
  • Uranium 26 samples
  • Hardness 106 samples
  • pH 977 samples
  • Sodium 2252 samples

Public vs. Private Water in Lucas County

46 Active public water systems
433,180 Residents on public water
4% Households on private wells

Public water systems in Lucas 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 Lucas 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 Lucas County Prevalence OH Average Source Year
Lead Heart disease rate 7.8% 7.6% 2020
Nitrate Cancer prevalence 5.8% 6.8% 2020

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