Depth's Role in Understanding Local Water Quality
Groundwater samples taken in San Juan County, specifically from the 110AVMB aquifer, have been collected between 35 and 68 feet below the surface. The depth of these wells is significant because water chemistry, including factors that contribute to corrosivity, can vary within this range. A household drawing water from a similar depth range in this aquifer will generally encounter water conditions represented by these regional samples, but exact conditions require individual testing.
Interpreting Chloride Concentrations: Median and Range Insights
The U.S. Geological Survey’s sampling over recent years shows chloride levels with a median of 64.0 mg/L. The range extends from 19.0 to 470.0 mg/L across nine wells and 228 samples. Chloride at these concentrations influences water corrosivity—higher concentrations can increase the risk of pipe and fixture degradation even if no safety concerns are indicated. For many households, this means existing protective measures against corrosive water may be strained or insufficient.
Effect of Fleck System Treatment at the Tap
Applying a Fleck Corrosive Water Damaging Pipes Filter modifies water at the point of use by reducing factors that accelerate corrosion. This technology works by conditioning water to reduce its aggressive effects on home plumbing, thus extending the lifespan of pipes and fixtures. Households experiencing equipment wear or leaks related to corrosion often find that the water treated by this system is more manageable for their plumbing infrastructure, even when prior measures have lagged behind the water's impact.
Patterns in Water Quality: Seasonal and Multi-Year Fluctuations
The data collected spans from mid-2010 to late 2025, capturing both seasonal shifts and longer-term trends in the aquifer’s chloride levels. Variations within this timeframe show that water corrosivity can increase or decrease over months and years, which aligns with regional hydrological changes or human activity. Homeowners monitoring corrosivity concerns should consider periodic testing, as reliance on a single point measurement will not capture the full scope of variability observed in San Juan County.
Steps to Confirm Household Water Conditions
To determine the corrosive nature of their own water supply, homeowners should begin with checking for signs like frequent pipe leaks, metal staining on fixtures, or premature equipment failures. The next level involves straightforward water testing focusing on parameters indicative of corrosivity, such as chloride concentration and other chemical factors. If results suggest corrosive tendencies, laboratory analysis can provide a detailed chemical profile. This staged approach helps prioritize expense and effort relative to the evidence of corrosivity arising from visual inspection and initial tests.
What Not to Assume from Regional Data
While the San Juan County aquifer sampling provides valuable insight into water quality trends over a substantial area and duration, it does not reveal the exact chemical makeup of any individual household’s water. Variations within the aquifer and differences in well construction or depth can produce distinct water characteristics. Therefore, area data should not be interpreted as a direct diagnosis of corrosivity for a single property or used in place of personal water testing.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2025-09-19. 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 110AVMB aquifer (San Juan County): 228 results from 9 wells, median 64.0 mg/L, range 19.0-470.0 mg/L; 20 above an AESTHETIC secondary standard only (secondary standard 250.0 mg/L (aesthetic)) - not a health finding
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