Arsenic in Cleveland County Water: Understanding Local Aquifer 318GRBR Data
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When considering arsenic levels in household water, area-wide data like that from Cleveland County's aquifer 318GRBR can provide guidance but does not define individual well conditions. The U.S. Geological Survey collected 41 samples from 6 wells ranging in depth from 360 to 698 feet across this aquifer between May 2012 and May 2013. Every sample detected arsenic, with results spanning 9.8 to 94.1 micrograms per liter (µg/L). While these figures reveal presence, they do not indicate any exceedance of federal arsenic thresholds in these specific wells.
If arsenic in water remains untreated for years
Continuous exposure to arsenic in drinking water, even at concentrations below federal thresholds, can be a concern over long periods. Arsenic is a naturally occurring element that may enter groundwater through soil and rock dissolution. Its presence is not always apparent without testing, as it is tasteless and colorless. Prolonged consumption of water containing arsenic can affect health, so understanding whether household water contains elevated levels is important for managing potential risks.
If sample depth and well characteristics vary
The depth of groundwater wells can influence arsenic concentrations. In the Cleveland County data, wells sampled were 360 to 698 feet deep. Variability in arsenic within different depths of the aquifer is expected due to geology and water flow patterns. Shallow or deeper wells may sample water with different arsenic content than those in the government data set. Therefore, the data from these six wells provides a regional overview but may not mirror individual household well conditions.
If considering the number of samples and wells behind the data
The 41 samples from six wells offer a snapshot of arsenic levels over approximately one year in the aquifer. While this sampling is useful for regional assessment, it is limited in scope compared to the total number of private wells in Cleveland County. A small number of wells sampled cannot capture the full variability within the aquifer, so individual well testing is necessary to accurately gauge household water arsenic content.
If exploring how arsenic enters groundwater here
Arsenic in Cleveland County groundwater primarily originates from natural geochemical sources, where arsenic-bearing minerals release it into water as it passes through the aquifer matrix. Human activities are not identified as primary contributors in this aquifer. Understanding this helps explain why arsenic presence can be consistent across multiple wells in an area yet vary significantly between specific locations and depths.
If examining seasonal or multi-year variation in arsenic
The existing dataset spans May 2012 to May 2013 and shows arsenic concentrations ranging from 9.8 to 94.1 µg/L. No data beyond this period is included, so insight into seasonal fluctuations or multi-year trends specific to this aquifer is limited. The measurements demonstrate that arsenic levels can vary within at least a one-year span but do not reveal a consistent increase or decrease over time.
To determine your household water's arsenic status, the essential step is to have your water tested specifically for arsenic concentration. Only that will confirm whether treatment is warranted. Should you find arsenic at levels of concern, a Pentair Arsenic Filter ships ready to configure and can address arsenic effectively, helping ensure safer water for your household.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-05-01. 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 318GRBR aquifer (Cleveland County): 41 results from 6 wells, median 49.1 ug/L, range 9.8-94.1 ug/L; none above any federal threshold