How do public water system records differ from private well testing when determining my water quality?
Government groundwater sampling in San Juan County’s aquifer 110AVMB provides an aggregated view of water quality. For example, the U.S. Geological Survey collected 229 samples from nine wells between 2010 and 2025, measuring constituents like hardness, calcium, and magnesium. These samples reflect conditions across the area and should not be interpreted as the exact profile of any individual household’s water, including your own well. Unlike private well testing, public system records report median and range values but cannot pinpoint specific concentrations inside a single home’s plumbing. To understand your own water, individual testing from your source is necessary.
How can I compare water quality data from San Juan County’s aquifer 110AVMB with neighboring counties without overinterpreting the information?
When contrasting water data across counties, recognize that sampling methods, well depths, and water sources vary. For instance, the San Juan County data show hardness measurements ranging from 644 to 1,750 mg/L with a median of 1,190 mg/L, all from wells 35 to 68 feet deep. Neighboring areas may have different aquifer characteristics or sampling depths, which affect these ranges. Avoid assuming that a difference in median values automatically indicates better or worse water quality. Such comparisons only offer general regional context, not specific household conditions.
What does the measured hardness range mean relative to federal standards, and what conclusions should I avoid?
All hardness values reported in San Juan County’s aquifer 110AVMB fall below federal thresholds for safety. This means no sample exceeded any health-based limits. However, hardness is primarily an aesthetic and operational concern, affecting factors like scale buildup and appliance performance rather than safety. It is important not to interpret a measured detection or range as a violation or indication of unsafe water. Instead, these figures highlight variations in mineral content that may influence treatment choices.
How do well depth, sample depth, or water source type affect what I should expect from my water quality?
The sampled wells in the Public USGS data were between 35 and 68 feet deep. Your own well may be deeper, shallower, or access a different water layer, which can affect constituent levels like hardness. Generally, shallower wells may show different mineral profiles than deeper ones. Differences in source type—such as groundwater versus surface water—also impact water composition. Given these variables, the area data serve as a guide but do not substitute for targeted testing of your household supply.
Why do aesthetic secondary standards differ from health-based limits for hardness in this area?
Hardness in water reflects calcium and magnesium content and influences taste, scaling in pipes, and appliance lifespan. Aesthetic secondary standards set by agencies address these quality factors, not health concerns. In the San Juan County samples, hardness levels remain within federal safety thresholds. Exceeding secondary standards does not pose a health risk but may cause practical issues that lead homeowners to consider treatment solutions. This distinction is essential in deciding how to manage your water after equipment failure.
What is the single test I should order to clarify my well water needs, and how will the Fleck Total Well Chlorination System help?
After your existing equipment has failed, the key step is to order a comprehensive water test specific to your well, including hardness, calcium, magnesium, and potential bacterial presence. This test will confirm your water’s precise condition and guide appropriate treatment. The Fleck Total Well Chlorination System, with a grain capacity of 32,000, ships ready to configure and is designed to address total well water issues like mineral buildup and microbial contaminants. It can restore water quality reliably based on your confirmed water profile.
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 Hardness, Ca, Mg in the 110AVMB aquifer (San Juan County): 229 results from 9 wells, median 1190.0 mg/L, range 644.0-1750.0 mg/L; none above any federal threshold
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