Understanding Regional Sampling Versus Individual Well Testing
Water in St. Louis County typically comes from the aquifer labeled 111ALVM, a common source for residential wells. The U.S. Geological Survey sampled groundwater from two wells in this area, measuring iron concentrations on November 7, 2013. These results represent a regional snapshot, not a direct test of any one household’s well water. A homeowner’s water quality can only be confirmed by specific testing of their own system. Publicly available records like these provide context but do not indicate the exact iron bacteria levels in your water.
Interpreting the Median and Range of Iron Measurements
The recorded iron concentrations in these samples ranged from 4580 to 6200 micrograms per liter (ug/L), with a median value of 5420 ug/L. These figures come from wells between 25 and 80 feet deep. For a homeowner, this means iron is commonly present at measurable levels in the regional aquifer. However, the range indicates natural variability between different points in the groundwater system. Your well’s concentration may fall above, below, or within this range depending on local conditions.
Federal Standards and What the Iron Data Does Not Indicate
It is significant that none of the samples exceeded any federal iron-related thresholds. These federal standards cover both health and aesthetic factors such as staining potential and taste changes. The data does not imply unsafe conditions but rather the presence of iron consistent with the natural geochemistry of the aquifer. Detection of iron is not equivalent to a violation or health risk; it is a common component in groundwater that may require treatment for household use.
Differentiating Iron Bacteria from Other Water Issues
The presence of iron bacteria can be confused with other water quality concerns, such as simple iron sediment or sulfur bacteria. Iron bacteria produce slime and may cause clogging or unpleasant appearances in plumbing, which differs from mineral deposits alone. Unlike mineral iron particles that settle, iron bacteria involve biological activity altering water properties. Identifying iron bacteria specifically requires laboratory tests targeting bacterial presence in addition to iron measurement.
Effect of Treatment on Water Quality at the Tap
When iron bacteria affect household water, treatment technologies like the Autotrol Iron Bacteria & Slime Filter can be employed. This system conditions water to reduce bacterial slime and iron-related staining, improving clarity and appliance longevity. After treatment, taps typically deliver water free of slime buildup and with diminished iron staining potential. The change is noticeable in water appearance as well as plumbing maintenance demands.
Influence of Plumbing Age and Material on Iron Bacteria Issues
The condition of your home's plumbing can play a role independent of source water quality. Older piping or specific materials may harbor bacterial colonies more readily, worsening iron bacteria symptoms. Even with the same groundwater iron concentration, newer or different plumbing might reduce accumulation and slime. Therefore, addressing iron bacteria often involves considering both water treatment and plumbing system characteristics.
In summary, the USGS data from St. Louis County’s aquifer 111ALVM shows iron is regularly detected within a moderate range, with no exceedances of federal limits in the sampled wells. This regional information assists in understanding what might be expected in residential wells but cannot substitute for personal water testing. Homeowners evaluating treatment options to address iron bacteria may consider the documented Autotrol Iron Bacteria & Slime Filter system, which ships ready to configure for residential use. For detailed regional data, visit the U.S. Geological Survey groundwater monitoring site covering aquifer 111ALVM.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-11-07. 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 111ALVM aquifer (St. Louis County): 4 results from 2 wells, median 5420.0 ug/L, range 4580.0-6200.0 ug/L; none above any federal threshold