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Water from New Castle County's Aquifer 112CLMB and Its Journey to Your Tap

Water supplying households in New Castle County commonly comes from the aquifer designated 112CLMB. This groundwater travels through underground rock and sediment layers before reaching private wells or public water systems. The water’s composition can reflect the natural mineral content of the aquifer, which may affect household plumbing and water appearance.

Distinguishing Public System Records from Private Well Testing

Government sampling provides valuable insight into water quality across New Castle County’s aquifer but represents an average condition, not specific well water. For example, the U.S. Geological Survey monitored this aquifer through 18 samples from 11 wells between 2010 and 2023. These samples showed iron detected in 11 measurements, with levels ranging from 5.7 to 978.0 micrograms per liter (ug/L), though none exceeded federal health thresholds. However, this data does not indicate your private well’s iron concentration, which requires direct testing to confirm.

Sample Size and Interpretation: What Eleven Wells Tell Us

The sampling involved wells 10 to 95 feet deep, providing a geographic snapshot of iron presence within the aquifer. The median iron measurement was 12.7 ug/L, but variation among wells was significant, reflecting natural variability in groundwater conditions. While eleven wells sampled offer useful context, they represent a limited subset of the aquifer and cannot predict every household’s water quality exactly.

Steps to Identify Iron and Rust Causes in Household Water

• Begin by checking for visual evidence of rust-colored stains or reddish tint in water and fixtures.
• Test water directly from your source with an at-home iron test kit to establish if iron is present and at what approximate level.
• Consider sending a water sample to a certified laboratory for a detailed iron concentration report.
• Rule out recent plumbing work or pipe changes that might temporarily affect water appearance.

Impact of Plumbing Materials and Age on Iron and Rust Appearance

Rust-colored water may not only arise from iron in source water but also from corrosion inside household plumbing, particularly with older iron or steel pipes. Over time, rust can buildup and release iron particles, causing staining and discoloration independent of water quality from the aquifer. Understanding the age and condition of your plumbing helps differentiate source water issues from internal pipe corrosion.

Considering Seasonal and Multi-Year Variation in Water Quality

The government data spans sampling dates from March 2010 through August 2023. This long timeframe shows iron levels can vary within the aquifer over different years and conditions. Seasonal changes, water table fluctuations, and aquifer recharge can influence iron concentrations, meaning test results may differ depending on when and where samples are collected.

Summary and Next Steps

The iron measurements for New Castle County’s aquifer 112CLMB provide a broad look at groundwater conditions but do not determine individual well water quality. Iron presence in the area is commonly below federal thresholds, though natural variability exists. To confirm your household’s water characteristics, direct testing of your water source is necessary. Addressing iron and rust stains effectively can involve a Pentair Orange Iron & Rust Stains Filter, a system designed to reduce iron-related discoloration and improve water clarity. The government data used here comes from U.S. Geological Survey sampling and is publicly available for review.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2023-08-03. 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 112CLMB aquifer (New Castle County): 18 results from 11 wells, median 12.7 ug/L, range 5.7-978.0 ug/L; none above any federal threshold