What Laboratory Arsenic Reports Reflect in Your Water Analysis
When a laboratory test report lists arsenic in water, it shows the concentration in micrograms per liter (ug/L) measured at that sample point. Such results are specific to the tested water and do not represent other locations or times. According to U.S. Geological Survey sampling of five separate wells in St. Clair County aquifer 110QRNR between July 2011 and August 2015, arsenic was detected in all six results, ranging from 0.13 to 20.0 ug/L with a median of 1.625 ug/L. None of these measurements exceeded any federal threshold for arsenic in drinking water. This data reflects conditions in wells sampled at depths between 31 and 60 feet, not necessarily your household well or tap water.
Household Fixtures and Appliances First Affected by Arsenic
Arsenic in water primarily impacts fixtures and appliances that use water directly or have internal components exposed continuously to water flow. Faucets, showerheads, water-using appliances such as coffee makers, ice machines, and humidifiers often show early signs of arsenic-related buildup or changes in taste, although arsenic itself is not typically visible or directly damaging in aesthetic ways. Filtration and water treatment systems in homes may struggle to maintain the necessary removal rates if water arsenic levels fluctuate near the higher end of local measurements, potentially requiring capacity reassessment.
The Influence of Plumbing Material and Age on Arsenic Presence
While plumbing materials and system age do not add arsenic to water, they can affect how certain metals interact with arsenic compounds. For example, older pipes with corrosion or specific metal compositions might influence arsenic mobility or particle adherence, potentially affecting water clarity or treatment effectiveness. It is important to consider both source water quality and internal plumbing conditions when evaluating water treatment options for arsenic.
How Arsenic Enters Groundwater in St. Clair County
Arsenic in the St. Clair County aquifer 110QRNR primarily originates from natural geological formations where arsenic-bearing minerals dissolve into groundwater over time. Human activities have not been identified as primary contributors in this regional sampling. Variations in arsenic concentrations can result from the interaction of groundwater with aquifer materials at sampled depths of 31 to 60 feet, influencing measured levels during the 2011 to 2015 period.
Seasonal and Multi-Year Variation Observed in Local Arsenic Levels
The U.S. Geological Survey’s data includes samples taken between July 2011 and August 2015 showing arsenic levels ranging from 0.13 to 20.0 ug/L. This range indicates some natural fluctuation over multiple years and seasons. Understanding these variations helps in assessing whether existing household water treatment equipment is adequate or if additional capacity could be beneficial to address periods of higher arsenic presence.
Distinguishing Aesthetic Secondary Standards from Health-Based Limits for Arsenic
Aesthetic secondary standards relate to taste, odor, color, and staining but do not apply to arsenic as it is regulated by a stringent federal health-based limit. The sampled arsenic concentrations in St. Clair County did not exceed these health-based thresholds. It is important to recognize that detecting arsenic does not imply a violation or unsafe condition but does justify monitoring and treatment consideration designed to reduce arsenic exposure when levels approach the upper range of measurements.
Summary of Arsenic Data Scope and Treatment Resource
The U.S. Geological Survey groundwater data for St. Clair County’s 110QRNR aquifer includes six arsenic measurements from five wells sampled at depths of 31 to 60 feet between mid-2011 and mid-2015. This regional data reflects typical arsenic presence but does not represent individual household water. To address challenges when current equipment struggles to maintain arsenic reduction, the C-Series Arsenic Filter system ships ready to configure and provides documented treatment capacity tailored for such conditions.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2015-08-05. 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 Arsenic in the 110QRNR aquifer (St. Clair County): 6 results from 5 wells, median 1.625 ug/L, range 0.13-20.0 ug/L; none above any federal threshold