Understanding Iron Concentration Data: A Homeowner’s Perspective
Median and Range Explained
The U.S. Geological Survey sampled groundwater from 20 wells in Washoe County’s 100VLFL aquifer between May 2010 and September 2023. Iron was detected in 22 results out of 37, with a median value of 9.2 micrograms per liter and a range from 3.2 to 977 micrograms per liter. These numbers represent iron concentrations measured across various wells 14 to 815 feet deep, not any single household water supply.
What These Numbers Do and Don’t Mean
The detection of iron in this aquifer’s wells is common but remains below federal thresholds, indicating no regulatory exceedances. However, iron bacteria can still develop if iron and organic matter combine in plumbing environments. Understanding these ranges helps homeowners anticipate potential iron-related issues without assuming their water matches any specific value.
The Role of Plumbing Material and Age in Iron Bacteria Development
Older Plumbing May Encourage Bacterial Growth
Materials such as galvanized iron or older steel pipes can provide surfaces that facilitate iron bacteria colonies, even if source water iron is moderate. Corrosion or deposits inside pipes may serve as a habitat for iron bacteria slime.
Plumbing Conditions Affect Iron Bacteria Beyond Source Concentrations
Iron bacteria presence depends on chemical conditions in the plumbing system, including oxygen levels, temperature, and pipe material, which do not directly correlate with iron in the raw aquifer water.
Differences Between Public System Sampling and Private Well Testing
Public Records Reflect Area-Wide Aquifer Conditions
The USGS data represent multiple wells sampled over years, giving a broad picture of iron concentrations in the Washoe County aquifer but do not describe any individual well’s current condition.
Private Wells Require Specific Testing
Homeowners should obtain certified laboratory tests of their own water to know their actual iron levels and whether iron bacteria bacteria are present locally, as this data cannot replace direct testing.
Additional Questions for Commercial or Industrial Water Users
Water Volume and Process Sensitivity
Commercial users may need to evaluate iron bacteria impact on equipment or production quality differently, including system-specific thresholds and maintenance protocols.
Regulatory and Monitoring Requirements
Businesses might face additional standards or monitoring obligations related to water quality that households typically do not encounter.
Sample Size and Well Distribution Behind These Figures
Number of Samples and Wells Indicates Moderate Data Depth
The figures come from 37 samples collected across 20 wells over more than a decade, offering a reasonable but not exhaustive dataset for the region.
Variability Among Wells
Iron concentrations vary widely, reflecting differences in well depth, geology, and local conditions within Washoe County’s aquifer system.
Pathways of Iron and Iron Bacteria into Local Groundwater
Iron Originates from Natural Aquifer Geology
Iron dissolves from minerals in soil and rock into groundwater and is normally present in low levels across the 100VLFL aquifer.
Iron Bacteria Thrive Where Iron Meets Organic Matter
These bacteria feed on iron and can form slime deposits primarily inside plumbing or distribution systems rather than in raw groundwater itself.
This summary of iron concentrations and bacterial considerations is based on U.S. Geological Survey sampling of 20 wells in Washoe County’s 100VLFL aquifer from 2010 to 2023. For detailed results and updates, consult the official USGS groundwater data sources.
Homes experiencing iron bacteria growth beyond what existing equipment manages may want to consider treatment solutions such as the C-Series Iron Bacteria & Slime Filter, which ships ready to configure to help reduce bacterial slime and associated issues.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2023-09-21. 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 100VLFL aquifer (Washoe County): 37 results from 20 wells, median 9.2 ug/L, range 3.2-977.0 ug/L; none above any federal threshold