Why Aesthetic Secondary Standards Differ from Health-Based Limits for Manganese
The manganese concentrations found by government sampling in Marion County's aquifer fall well below federal health-based thresholds. Manganese is regulated primarily by secondary standards that address taste, staining, and appearance rather than direct health risks. This means that detection or even reaching an aesthetic threshold does not indicate unsafe water but may cause discoloration or other visual effects in household water.
The Role of Plumbing Material and Age, Separate from the Source Water
Manganese-related staining and deposits can sometimes worsen due to older plumbing materials or pipes susceptible to deposits. The presence of manganese in water alone does not guarantee stain formation; factors such as pipe composition, water chemistry, and flow conditions influence whether household fixtures exhibit visible manganese effects.
How the Documented Treatment Technology Removes or Neutralizes Manganese
The Fleck Black Manganese Stains Filter is designed to reduce manganese concentrations that contribute to staining and other aesthetic concerns. This system employs filtration technology that traps manganese particles and prevents their accumulation in plumbing and fixtures, helping maintain clean, clear water for household use. The filter ships ready to configure for use in residential settings.
What the Measured Range Means Against the Relevant Federal Standard, and What It Does Not Mean
Government samples of five wells in the aquifer showed manganese ranging from 0.18 to 10.8 micrograms per liter (ug/L) with a median concentration of 0.83 ug/L. All results were below federal thresholds for manganese. This range reflects natural variability in groundwater but does not imply that individual wells exceed limits or present health risks. Local water testing is necessary to determine the manganese level for a specific household.
What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page
In the United States Geological Survey record, manganese was detected in all 20 samples tested from the five wells, meaning instruments measured manganese presence at some concentration. The median value represents the midpoint concentration level across these samples, while the range shows the lowest and highest manganese concentrations found. These statistics describe the aquifer’s general water quality and should not be interpreted as definitive data for any individual household.
The Household or Facility Symptoms That Do and Do Not Point to This Problem
Visible signs that may point toward manganese presence include black or dark stains on plumbing fixtures, laundry discoloration, and deposits in appliances. However, these symptoms can also arise from other water constituents. Manganese does not cause health-related symptoms when present below federal health thresholds, so any suspected health issue should be investigated separately. Confirming manganese as a cause requires specific water testing at the household point of use.
Government sampling in Marion County's S100SURFCL aquifer examined five wells from shallow depths (2 to 31 feet) and offers a regional overview of manganese data for this area. For more detailed and current information, refer to the U.S. Geological Survey groundwater database linked in the metadata above.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2010-08-04. 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 Manganese in the S100SURFCL aquifer (Marion County): 20 results from 5 wells, median 0.83 ug/L, range 0.18-10.8 ug/L; none above any federal threshold
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