Government groundwater sampling in Cumberland County’s bedrock aquifer area found iron present in all tested wells, with measured concentrations ranging from 4.5 to 382 micrograms per liter and a median near 39.8 micrograms per liter. These values reflect three samples taken from separate wells between early and late October 2011, each well ranging from 265 to 680 feet deep. No measurement exceeded federal health-based thresholds. This record offers a regional snapshot, not a specific reading of any individual household’s water.
Reading the Median and Range of Iron Concentrations as a Cumberland County Resident
The median value of 39.8 micrograms per liter means half the sampled wells measured below this and half above. The broad range from 4.5 to 382 micrograms per liter indicates variability in iron levels across different wells within this bedrock aquifer. Homeowners can expect that iron concentrations may vary significantly depending on their well’s depth, geological features, and location within the county. To know personal water iron levels, household water quality testing from a certified laboratory is necessary because regional data cannot substitute for individual results.
Why Secondary Aesthetic Standards for Iron Do Not Equate to Health-Based Limits
Iron presence in water is governed by secondary standards that focus on aesthetics such as taste, color, staining, and slime formation, not on direct health risks, as federal regulations do not classify iron at typical levels as a health hazard. Thus, detecting iron—even above typical sensory thresholds—is not a violation or a safety concern. These standards guide expectations around water appearance and potential plumbing impacts rather than mandate treatment for safety.
How Variation Across Sampling Dates Reflects Real-World Iron Level Fluctuations
The samples taken over three weeks in October 2011 show a snapshot within a limited timeframe. Iron concentrations in groundwater can vary seasonally or over longer periods due to factors like rainfall, temperature, and aquifer recharge rates. This data set’s single-month scope highlights the need for multiple or continuous testing to understand fully how iron levels might change in a household water supply over time.
Distinguishing Iron Bacteria From Similar Water Issues
Iron bacteria problems often get confused with problems like iron sediment or manganese. Unlike inert iron particles that settle out, iron bacteria are living organisms that create slime and cause staining or unpleasant tastes. Both can originate in the source water, but iron bacteria also can colonize plumbing surfaces, forming biofilms that require treatment methods targeting biological activity in addition to mineral removal.
How Plumbing Materials and Age Affect Iron Bacteria Presence Separately From Source Water
The condition and type of household plumbing can influence iron bacteria buildup independently of source water iron content. Older pipes and some materials provide surfaces conducive to bacterial growth, while newer or smoother materials may resist colonization. Periodic pipe cleaning or replacement can reduce iron bacteria effects but does not address iron levels in the supply water itself.
What homeowners should NOT conclude from this regional data is that their own well’s water iron concentration or iron bacteria levels match the reported range or median. Only direct testing of a household water supply can establish that. For addressing iron bacteria, the C-Series Iron Bacteria & Slime Filter ships ready to configure and specializes in managing iron bacteria and slime in residential water systems, making it a solution to consider once testing clarifies the specific water conditions present.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2011-10-26. 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 (Cumberland County): 3 results from 3 wells, median 39.8 ug/L, range 4.5-382.0 ug/L; none above any federal threshold