What the Measured Chloride Range Means Against Federal Standards
Government sampling in Barnstable County, specifically aquifer 112OTSH, shows chloride levels varying widely across wells. Chloride is primarily a marker affecting taste, staining, and corrosion potential. The secondary standard for chloride is 250 mg/L, which governs aesthetics rather than health. Out of 261 samples from 208 wells, 71 exceeded this secondary level, but this does not indicate contamination or unsafe water. It simply means that in some wells, residents might notice a salty taste or see staining effects on plumbing fixtures.
Understanding 'Detected,' 'Median,' and 'Range' in the Sampling Record
All samples (261) tested positive for chloride, which means chloride was measurable in every tested well within the aquifer. The median chloride concentration was 38.4 mg/L, representing the middle value when results are ordered, indicating typical concentrations encountered across wells. The range from 4.84 to 17,200 mg/L shows there is great variability in chloride levels depending on the specific groundwater source, well depth, and location. This range does not describe your home's water exactly; only testing your own well can determine that.
Seasonal and Multi-Year Variation Reflected in Sampling Dates and Ranges
The data obtained from June 2016 to August 2023 captures both seasonal and longer-term fluctuations in chloride concentrations. Such variability can arise from rainfall, groundwater recharge rates, and human activities affecting the aquifer. Sampling wells from 2 to 69 feet deep also contributes to variation, as shallower wells may be more affected by environmental changes. While some wells crossed the aesthetic threshold during this period, others remained below, highlighting the dynamic nature of groundwater quality in Barnstable County.
Simplifying Maintenance Rhythm of the C-Series Total Well Chlorination System
When considering treatment options to address total well water concerns, the C-Series Total Well Chlorination System offers a robust approach to disinfect and maintain water quality. This system is designed for lasting capacity, with a grain capacity of 32,000, requiring attention according to usage and water quality results. Maintenance involves periodic monitoring and replenishing the chlorination media to ensure continuous water treatment. The system ships ready to configure, allowing homeowners to manage their water treatment with flexibility and control.
Comparing Public-System Records with Private Well Testing
Data from the Barnstable County aquifer represents an aggregate of multiple wells sampled by the U.S. Geological Survey and reflects regional groundwater characteristics, not any individual's well water. Public water system records typically provide ongoing surveillance and meet EPA health standards, but private wells require individual sampling to determine specific water conditions. Homeowners weighing treatment options should obtain laboratory analysis of their well water to identify constituents relevant to their household. Such tailored testing will guide the choice of an appropriate treatment system like the C-Series Total Well Chlorination System.
In summary, the chloride sampling record from 208 wells in Barnstable County's aquifer 112OTSH, collected over seven years, documents a broad range of chloride levels from natural and environmental factors. This regional data helps inform treatment decisions for private wells experiencing taste, staining, or corrosion issues. For more details and to review the full governmental source data, consult the U.S. Geological Survey groundwater monitoring resources.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2023-08-24. 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 112OTSH aquifer (Barnstable County): 261 results from 208 wells, median 38.4 mg/L, range 4.84-17200.0 mg/L; 71 above an AESTHETIC secondary standard only (secondary standard 250.0 mg/L (aesthetic)) - not a health finding