Manganese in Queens County Water: Understanding What Government Sampling Reveals
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Fleck Black Manganese Stains Filter
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How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means
The U.S. Geological Survey sampled groundwater in Queens County's aquifer 112GLCLU over an 11-year period, from 2010 to 2021. Their record includes 214 manganese results from 48 wells ranging in depth from 23 to 265 feet. This data set reflects a broad view of manganese concentrations in the area but does not represent any one household well directly. While 213 samples detected manganese, the concentrations ranged widely from 0.2 to 19,000 micrograms per liter (ug/L), with a median value of 6.29 ug/L. This variation means manganese presence can fluctuate significantly depending on local geology and well characteristics. It is important to note that these figures show measured values in the area’s wells, not necessarily in your water supply.
Why Aesthetic Secondary Standards Differ From Health-Based Limits, Applied to This Constituent
Federal standards do not list manganese as a health-based violation in the Queens County aquifer samples. None of the results exceeded federal manganese thresholds. Aesthetic secondary standards for manganese exist to address taste, discoloration, and staining issues rather than health concerns. Exceeding these secondary standards is not classified as unsafe or illegal but may cause water to look or taste unpleasant and can stain plumbing fixtures, laundry, or appliances. Understanding the distinction between aesthetic effects and health risks is critical when evaluating manganese in your water.
Which Fixtures, Appliances or Processes Are Affected First and Why
Manganese primarily affects household fixtures and appliances through staining and discoloration. Toilets, sinks, bathtubs, and dishwashers may show brown or black stains linked to manganese deposits. Laundry may also be affected by discoloration of white or light-colored fabrics. Additionally, water-using appliances prone to buildup, such as coffee makers or humidifiers, may accumulate manganese deposits over time. These issues typically occur before any taste changes or water clarity issues become noticeable. Observing such staining is often the first indication that manganese concentrations in your water might be elevated enough to consider treatment options.
A Worked Example: Reading the Record's Median and Range as a Homeowner Would
The median manganese concentration of 6.29 ug/L in Queens County's aquifer indicates that about half the sampled wells had manganese levels at or below this measure. Meanwhile, some individual wells reached concentrations as high as 19,000 ug/L, illustrating the broad range possible within the area. This means that while many homes may not experience noticeable manganese presence, others could have levels high enough to cause stains or water quality changes. Without a test of your own water, it is impossible to know where your home's water fits within this range. The recorded range serves as a frame of reference to understand what is typical and what may be exceptional in this area.
How Seasonal or Multi-Year Variation Shows in the Record (Dates and Ranges Given)
Sampling data from June 2010 through May 2021 shows manganese concentrations can vary over time in this aquifer. Seasonal changes in groundwater levels, rainfall, and other environmental factors can influence manganese mobilization and detection. Variability between wells sampled at different times confirms that manganese presence is dynamic rather than constant. Homeowners should be aware that a single test captures conditions at one moment, and concentrations may shift over months or years. Monitoring over time or retesting can provide a clearer picture of manganese trends affecting your water supply.
Final Consideration: To determine if manganese affects your household water, order a certified laboratory test specifically measuring manganese concentration in your tap or well water. This result will clarify whether manganese levels in your home warrant treatment. For those seeking a solution to manganese-related staining or discoloration, the Autotrol Black Manganese Stains Filter ships ready to configure and provides a documented technology to remove manganese from residential water supplies effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2021-05-14. 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 112GLCLU aquifer (Queens County): 214 results from 48 wells, median 6.29 ug/L, range 0.2-19000.0 ug/L; none above any federal threshold