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Understanding 'Detected', 'Median', and 'Range' in Androscoggin County Iron Data

The U.S. Geological Survey sampled three bedrock aquifer wells in Androscoggin County between August and October 2011. Iron was detected in all three, with results ranging from 5.3 to 21.5 micrograms per liter (ug/L). The median value was 7.0 ug/L. 'Detected' means iron was measurable in every sample; 'median' is the middle concentration between the lowest and highest; and 'range' shows the spread from smallest to largest value during the sampling period. None of these results exceeded federal thresholds for iron concentration.

Iron Bacteria vs. Commonly Confused Water Issues: Clarifying the Problem

Iron bacteria are microorganisms that thrive in iron-rich waters, causing slime buildup and possible staining in household plumbing. This differs from iron that is simply dissolved in water, which might cause color or metallic taste but no bacterial growth. It also differs from manganese issues, which can produce similar staining but originate from a different mineral. Correctly identifying iron bacteria helps determine if biologically oriented treatment or mineral filtration is more appropriate.

Seasonal and Multi-Year Changes Reflected in Local Iron Measurements

The sampling was conducted over a short period from late summer to early fall in 2011. This snapshot reflects stable iron presence in the aquifer during those months but does not capture seasonal fluctuations that may occur over winter or spring. Iron levels can vary with changes in groundwater flow, temperature, and bacterial activity. Long-term or repeated testing would be required to define these patterns fully.

Comparing Androscoggin County to Neighboring Areas With Care

While Androscoggin County's bedrock aquifer samples show iron presence within a modest range, neighboring counties may report different iron levels due to geologic and hydrologic differences. Such comparisons should be made cautiously, considering the type of aquifer sampled, depth of wells, and sample sizes. Differences in reported iron concentrations do not necessarily indicate better or worse water quality but rather natural variation in local groundwater.

Sample Size and Its Implications for Interpreting the Iron Bacteria Risk

The data come from only three wells at depths between 262 and 304 feet. This limited sample size means the results provide a general indication of iron presence in the bedrock aquifer but do not represent every well or household. Individual wells may vary significantly, so homeowners should perform their own water testing to determine specific iron bacteria levels before deciding on treatment.

What This Means for Your Household Water Treatment Decisions

The local government data show iron is commonly detected in the Androscoggin County bedrock aquifer but at concentrations well below any federal limit. This suggests that iron bacteria could be present, given the measured iron, but does not confirm their level in your well. To address iron bacteria effectively, households often use specialized treatment systems designed to reduce bacterial slime and iron-related issues. The Pentair Iron Bacteria & Slime Filter is one documented solution that ships ready to configure for residential use and targets this problem specifically.

Important: Do Not Assume

Do not conclude from this area data alone that your water exhibits these exact iron levels or bacterial activity. Each well is unique, and only direct testing of your water for iron bacteria and iron concentration can reveal your home's water condition. The government sampling provides regional context to help guide testing and treatment choices but is not a substitute for well-specific analysis.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2011-10-13. 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 BEDROCK aquifer (Androscoggin County): 3 results from 3 wells, median 7.0 ug/L, range 5.3-21.5 ug/L; none above any federal threshold