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The U.S. Geological Survey sampled groundwater from eight separate wells in the San Juan County aquifer between September 2024 and September 2025. The results show the presence of calcium and magnesium, components contributing to water hardness, detected consistently with a median concentration of 1120 mg/L and a range from 449 mg/L to 1560 mg/L. None of these results exceeded federal thresholds. These data reflect the area's aquifer conditions and do not represent any individual household’s water.

If Your Certified Laboratory Test Reports Calcium and Magnesium Levels

A certified laboratory test measuring calcium and magnesium concentrations will indicate your water’s hardness level. These minerals often appear as milligrams per liter (mg/L). Understanding these numbers helps determine the scale of water hardness contributing to spotting on dishes and glassware. However, the specific test result is necessary for your household’s conditions because the San Juan County area shows a broad range in sampled wells.

If You Are Deciding What to Check Before Laboratory Testing

• Start with visual inspection: note the frequency and pattern of spotting on dishes after washing.
• Check your detergent and rinse aid use and dishwasher settings; improper use can mimic hardness spotting.
• Consider your water source depth and look for any available local water quality reports.
• If spotting persists despite these checks, a laboratory test for calcium and magnesium concentration is the next step to confirm hard water as the cause.

If You Wonder How Calcium and Magnesium Enter San Juan County Groundwater

These hardness minerals originate from natural rock and soil formations that the groundwater passes through. The sampled wells, ranging from 37 to 101 feet in depth, show consistent detection of calcium and magnesium, indicating they are typical components of the regional aquifer water. These minerals enter groundwater gradually over time, influenced by geological composition and local hydrology.

If You Consider What Happens When Hardness Is Left Unmanaged

Untreated hardness in water can lead to mineral deposits on dishes and glassware appearing as spots or film. Over several years, this buildup can affect appliance efficiency and dish appearance but does not constitute a health risk. Addressing hardness before it causes visible spotting improves dishwasher performance and preserves the clarity of your glassware.

If You Compare Public-System Water Records to Private Well Testing

Public water systems in San Juan County provide regular water quality reports though they may not specifically reflect private well conditions. The USGS well samples represent a broad aquifer area rather than individual taps. Private well testing offers precise data for your household and is essential to tailor your water treatment effectively, while public records can guide general expectations about the local water mineral content.

This summary reflects the U.S. Geological Survey sampling of the San Juan County aquifer conducted from September 2024 through September 2025. For more detailed information, you may consult the official government source at waterdata.usgs.gov.

When deciding on water treatment for spot-free dishes, the Fleck Spotty Dishes & Glassware System ships ready to configure and is designed to handle the hardness minerals common to this region. This technology offers a documented approach for improving dish appearance in households facing similar water quality conditions.

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 aquifer (San Juan County): 11 results from 8 wells, median 1120.0 mg/L, range 449.0-1560.0 mg/L; none above any federal threshold