What Government Sampling Reveals About Iron in Mobile County Groundwater
The U.S. Geological Survey collected 26 groundwater samples in Mobile County's aquifer 122MOCN during summer 2011, measuring iron levels ranging from 3.3 to 59.8 micrograms per liter (ug/L), with a median of 8.9 ug/L. Iron was detected in 25 of these wells, all located between 14 and 68 feet deep. Importantly, no measurements exceeded federal limits for iron in drinking water.
Understanding Aesthetic Secondary Standards Versus Health-Based Limits
Iron's presence in water is primarily an aesthetic concern rather than a safety issue at typical concentrations. Secondary standards address effects like staining, slight discoloration, and metallic taste rather than health risks. The iron values in this Mobile County record are well within federal health-based thresholds, so detection alone does not indicate unsafe water.
Interpreting the Median and Range for a Residential Well
As a homeowner, you can view the record’s median (8.9 ug/L) as a typical iron concentration seen in this area’s wells, while the range (3.3 to 59.8 ug/L) highlights natural variability. This shows that iron levels can fluctuate significantly even within the same aquifer, reinforcing the need for your own water test to understand your specific conditions.
The Influence of Plumbing Materials and Age on Iron Bacteria Challenges
Iron bacteria issues often relate to the interaction of iron in water with household plumbing materials and system age. Older pipes and certain metals may provide surfaces where iron bacteria accumulate, causing slime formation and clogging. These factors can affect the severity of iron bacteria presence independently of source water iron levels.
Seasonal and Multi-Year Variations Evident in Sampling Dates
The sampling dates, spanning June through August 2011, show a snapshot during summer months. Seasonal shifts in groundwater chemistry can influence iron concentrations, sometimes elevating iron bacteria activity in warmer months. Multi-year trends aren’t covered here, so ongoing testing remains valuable for tracking fluctuations over time.
The Scope of Data: Number of Samples, Wells, and Limitations
With 26 wells sampled in the aquifer, the record offers a useful regional overview but remains limited in capturing all local variations. Each sample reflects a separate well, yet individual household wells may experience different results based on precise location, depth, and drilling specifics. Testing your own water is essential to complement this regional data.
How Sampling and Well Depth Affect Iron Expectations
The wells sampled ranged from 14 to 68 feet deep, which corresponds to typical residential well depths in Mobile County. Iron concentrations can differ at various depths due to geological layering and groundwater flow. Your well’s depth relative to this range influences what iron levels and iron bacteria tendencies you might expect.
Addressing Iron Bacteria With the C-Series Iron Bacteria & Slime Filter
For households experiencing iron bacteria problems after existing equipment failure, the C-Series Iron Bacteria & Slime Filter ships ready to configure and effectively targets iron bacteria and associated slime. Using this filter helps manage iron bacteria buildup and maintains clearer, more reliable water flow. Selecting a solution based on your water’s measured iron demand ensures effective treatment tailored to your needs.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2011-08-11. 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 Iron in the 122MOCN aquifer (Mobile County): 26 results from 26 wells, median 8.9 ug/L, range 3.3-59.8 ug/L; none above any federal threshold