Government groundwater sampling in Lee County focused on aquifer 230SDMR found arsenic detected in all 9 samples collected from 9 different wells between May and June 2012. The results ranged from 0.14 to 4.8 micrograms per liter (µg/L) with a median of 1.1 µg/L. None of these results exceeded federal arsenic thresholds. These data provide insight into the general arsenic levels in this aquifer, but do not establish the arsenic concentration in your household water, which requires direct testing.
Why Aesthetic Secondary Standards Differ from Health-Based Limits for Arsenic
Secondary standards relate to taste, staining, and corrosion, not safety
Arsenic has both health-based federal maximum contaminant levels (MCLs) and secondary standards. The secondary standards focus on aesthetic issues such as taste or discoloration but do not indicate health risks. The government data show all sampled wells are well below the health-based MCL, meaning no federal safety exceedance was detected in the Lee County aquifer.
Health-based limits assess long-term exposure risk
Health-based limits are designed to protect against potential chronic effects from arsenic ingestion over a lifetime. Monitoring these limits guides treatment decisions for household water sources to reduce arsenic below recommended levels.
The Order to Rule Things Out: From Cost-Effective Checks to Laboratory Testing
Check existing water equipment operation
Since your current water treatment has failed, confirming its condition and whether it is functioning properly is a practical first step.
Test your household water directly for arsenic
Because regional data do not define your specific water quality, a certified laboratory test of your tap or well water is essential to confirm your arsenic levels.
Evaluate other water quality factors
Assess parameters like pH, iron, and manganese which can affect treatment performance and water aesthetics but are unrelated to arsenic safety thresholds.
Additional Considerations for Commercial or Industrial Operators
Compliance with stricter regulatory requirements
Commercial and industrial water users may face additional arsenic monitoring and reporting standards, potentially requiring more frequent testing and documentation.
Higher volume water usage and treatment capacity
Operators must assess whether arsenic treatment systems can handle larger flow rates and water volumes compared to residential needs.
Household or Facility Symptoms That Do and Do Not Indicate Arsenic
Symptoms not strongly linked to arsenic presence
- Appearance of discoloration or staining is unlikely caused by arsenic.
- Unusual taste or odor typically does not relate to arsenic levels.
Symptoms warranting arsenic testing
- Known failure of previous arsenic treatment equipment.
- Health advisories or known local concerns based on official sampling.
Worked Example: Interpreting Lee County Arsenic Sampling Data as a Homeowner
Median arsenic concentration indicates typical aquifer value
The median 1.1 µg/L suggests most wells in the aquifer area have low arsenic levels, well under federal thresholds.
Range informs possible variations around the median
Some wells reached up to 4.8 µg/L but still remain below safety limits, indicating pockets of slightly higher arsenic that may affect some users.
Direct testing remains necessary for individual household accuracy
Your own well or water source could differ significantly from the regional data presented here because of local geology or well depth.
In summary, the U.S. Geological Survey sampling of nine wells in the 230SDMR aquifer of Lee County found detectable arsenic in all samples but none above federal safety limits. This record covers only aquifer-source groundwater and does not represent individual household water without a specific test. For detailed results and updates, consult the U.S. Geological Survey groundwater monitoring resources.
When ready to address arsenic concerns following confirmation by testing, consider the Pentair Arsenic Filter, which ships ready to configure as a direct-purchase solution tailored for residential water treatment needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2012-06-08. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of Arsenic in the 230SDMR aquifer (Lee County): 9 results from 9 wells, median 1.1 ug/L, range 0.14-4.8 ug/L; none above any federal threshold
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