What Does the Measured Arsenic Range Mean Compared to Federal Standards?
The U.S. Geological Survey sampled nine wells in Lee County's 230SDMR aquifer between May and June 2012, reporting arsenic concentrations from 0.14 to 4.8 micrograms per liter (µg/L) with a median of 1.1 µg/L. Importantly, no sample exceeded the federal maximum contaminant level for arsenic. This means while arsenic was detected in every well, the concentrations found in these regional samples do not establish a violation or immediate health concern by regulatory standards.
However, it's vital to remember these results represent multiple wells in the aquifer and cannot predict arsenic levels in any single home’s water supply. Arsenic concentrations can vary significantly between wells depending on depth, geology, and other factors.
How to Compare Arsenic Levels Between Lee County and Neighboring Counties Without Overreading
Regional groundwater arsenic data reflect broad conditions in aquifers but can differ from well to well. Comparing Lee County's 230SDMR aquifer levels to adjacent counties requires caution. Neighboring areas may report different median and range values due to natural variability in mineral deposits and water chemistry.
For example, a neighboring county might have a slightly higher median or wider range of arsenic concentrations. Yet these differences do not necessarily imply one region's water is safer or riskier overall. Such comparisons are useful for understanding local water trends but do not replace testing your specific water source.
Worked Example: Reading Median and Range as a Homeowner
Imagine you live in Lee County and learn that regional arsenic sampling found a median of 1.1 µg/L and a range of 0.14 to 4.8 µg/L. This median suggests most wells sampled had arsenic near 1.1 µg/L, a level well below federal thresholds. The range shows variation, with some wells measuring closer to 5 µg/L, still under regulatory limits.
As a homeowner, you should view these numbers as an indicator of what might be typical rather than what your water contains. Without your own test, you cannot determine your home's arsenic concentration.
Sequence for Ruling Things Out: From Affordable Checks to Targeted Testing
Before ordering arsenic tests, begin with straightforward user observations:
- Check if your water provider or well report includes recent arsenic data.
- Observe any unusual taste, staining, or odor, although arsenic is generally tasteless and odorless.
- Review any previous water quality reports for changes over time.
If concerns remain, the definitive step is to send a water sample from your tap to a certified laboratory for arsenic analysis. This test will confirm your water's arsenic level, which cannot be inferred from regional data alone.
Understanding Differences Between Secondary Aesthetic Standards and Health-Based Limits for Arsenic
It's important to distinguish arsenic from constituents regulated primarily by secondary standards, which govern taste, discoloration, or corrosion but are not health-based. Arsenic is regulated solely by a federal maximum contaminant level aimed at protecting health, not aesthetics.
Although the reported arsenic concentrations in Lee County wells fall below this health-based limit, treatments designed to reduce arsenic can improve safety margins and provide peace of mind when elevated levels are confirmed by testing.
For homes with confirmed elevated arsenic, a Pentair Arsenic Filter system ships ready to configure and provides a documented solution to reduce arsenic concentration in residential water supplies effectively.
Recommended Test to Settle Your Water Quality Question
The single test you should order is a certified laboratory arsenic analysis of your home's tap water. This result will clarify whether your water meets federal guidelines or if treatment like the Pentair Arsenic Filter is advisable. Regional measurements inform potential risk but cannot substitute for your water's direct assessment.
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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