Iron Bacteria in New Hanover County Residential Wells: What Aquifer 124CSLH Data Shows

The groundwater supplying New Hanover County taps often comes from aquifer 124CSLH. This aquifer's water moves through underground layers and reaches wells drilled between about 39 and 176 feet deep. Public data from 2012 through 2024 collected by the U.S. Geological Survey (USGS) offers a snapshot of iron levels, relevant because iron bacteria, which thrive where iron is present, can impact residential water quality.

What household signs might indicate iron bacteria, and which do not?

Common iron bacteria symptoms include a reddish-brown slime buildup on plumbing fixtures, staining on sinks or laundry, and sometimes a slimy film in toilets or water storage tanks. These symptoms result from iron bacteria feeding on iron dissolved in water. However, red staining can also come from non-bacterial iron deposits or even rust from older pipes, so staining alone does not confirm iron bacteria presence.

Conversely, cloudiness in water or unpleasant smells often stem from other causes like sediment or organic material unrelated to iron bacteria.

What information should I record before seeking treatment advice?

• Document any visible slime or staining and describe its color and location.
• Note changes in water taste or texture over time.
• Record your well depth and age if known, since bacteria thrive at different depths.
• Keep track of any water tests already performed and their dates.
• Note household size and water use patterns to determine flow demands.

How can I compare New Hanover County's iron bacteria data with data from nearby areas without overinterpreting it?

The USGS sampling of aquifer 124CSLH in New Hanover County shows iron detected in 46 of 54 samples, with a median concentration of 239 micrograms per liter and a range from 3.8 to 11,900 micrograms per liter. These numbers reflect findings from multiple wells, not any single household's water. Nearby counties with different aquifers may show different iron levels due to geology and groundwater conditions.

Comparisons should be qualitative: for example, a higher median iron concentration in another county may suggest a greater regional presence of iron bacteria potential, but it does not predict your well's condition without testing.

What changes if the home is large, a second home, or only used seasonally?

Larger households may see more pronounced iron bacteria symptoms due to higher water usage increasing biofilm buildup in plumbing. Seasonal homes left unused for months can experience iron bacteria growth inside stagnant water systems, as bacteria multiply without regular flushing. Second homes may require additional water system maintenance to reduce buildup risks.

How can I distinguish iron bacteria from other commonly confused water issues?

Iron bacteria produce a slimy accumulation that can be scraped from pipes or fixtures. This slime often feels slippery and appears reddish-brown. In contrast, iron sediment or rust tends to be granular and may settle out after water is allowed to sit. Manganese bacteria can create black slime and are less commonly encountered in this area. Routine water hardness or mineral content problems do not create slime.

What water test should I order to clarify iron bacteria presence, and how would results inform treatment?

The definitive step is to order a laboratory test that quantifies total iron and includes a bacteria presence assessment specifically for iron bacteria. This test is usually done through certified water testing labs that accept water samples from your home. A test that confirms iron bacteria will guide treatment choices.

The Fleck Iron Bacteria & Slime Filter ships ready to configure and is designed to reduce iron bacteria slime and iron concentrations. It works by filtering these constituents effectively, improving water quality for households experiencing iron bacteria symptoms.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2024-06-18. 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 124CSLH aquifer (New Hanover County): 54 results from 38 wells, median 239.0 ug/L, range 3.8-11900.0 ug/L; none above any federal threshold