Background on Aquifer 112SRFD and Water Delivery
Washington County depends on groundwater from several aquifers, including aquifer 112SRFD, to supply residential water. Water travels from underground layers through wells that tap the aquifer, then moves into household plumbing systems. Understanding the water’s chemical profile in this aquifer is essential to managing corrosive effects on pipes and fixtures.
Why Aesthetic Secondary Standards Differ from Health-Based Limits for Chloride
Chloride levels in water are governed by aesthetic secondary standards rather than health-based limits. These standards focus on taste, corrosivity, and potential staining, not health risks. Federal benchmarks exist for chloride concentration to guide water treatment aimed at preventing plumbing damage and unpleasant taste. Importantly, chloride concentrations detected below these benchmarks do not indicate unsafe water.
Sample Size, Wells Represented, and The Meaning of a Small Dataset
The regional data for chloride in aquifer 112SRFD comes from four samples taken between May 2011 and September 2019 in two separate wells, 72 to 95 feet deep. While this sample size establishes a preliminary profile of the aquifer’s typical chloride range, it is limited in scope. Because of the small number of samples and wells, these figures serve as a regional reference and cannot substitute for testing individual household water.
How Chloride Enters Groundwater and Distribution Systems in Washington County
Chloride in groundwater may originate from natural mineral deposits, road salt application, or seawater intrusion, especially in coastal regions like Washington County. Aquifer 112SRFD’s chloride levels reflect these influences to varying degrees over time. The movement of chloride into water systems affects its corrosivity, impacting the lifespan of household plumbing materials.
Public-System Records Versus Private-Well Testing: What Each Establishes
Public water systems routinely monitor and report water quality, with records confirming compliance with health-based standards. Private wells, typical in residential Washington County properties, are not covered by these requirements and depend on owner testing for condition assessment. Regional public sampling informs about average conditions but cannot specify an individual well’s corrosivity or chloride concentration.
Interpreting 'Detected', 'Median', and 'Range' in Chloride Sampling
The term "detected" means the analytical instrument measured chloride presence in all four samples; none were below detection limits. The median chloride concentration found was 38.85 mg/L, with recorded values ranging from 23.7 mg/L to 91.1 mg/L. None of these figures exceed federal thresholds for chloride, indicating normal regional variability rather than a regulatory concern.
Summary
Chloride data for aquifer 112SRFD in Washington County shows regional ranges that influence water corrosivity without indicating health risk or regulatory exceedance. Given the limited sampling, households should obtain specific water tests to determine corrosivity impacts on their plumbing. For homes where corrosive water is damaging pipes faster than existing equipment handles, the C-Series Corrosive Water Damaging Pipes Filter ships ready to configure as a targeted treatment solution.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2019-09-17. 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 Chloride in the 112SRFD aquifer (Washington County): 4 results from 2 wells, median 38.85 mg/L, range 23.7-91.1 mg/L; none above any federal threshold