What does a certified laboratory test for calcium and magnesium report, and how should I read it?
Certified laboratory testing for calcium (Ca) and magnesium (Mg) in water reports their concentrations usually expressed in milligrams per liter (mg/L). These two minerals combined define water's hardness. High hardness means more dissolved Ca and Mg, which often leads to mineral deposits forming on dishes and glassware after washing, causing spots or cloudiness.
A lab report will list specific concentrations for these minerals in your water sample. Recognizing these figures helps you understand how much hardness your water contains. However, because water varies widely, testing your own tap water with a certified lab is necessary to know your exact levels.
What do 'detected', 'median', and 'range' mean in the Travis County groundwater sampling data?
The U.S. Geological Survey sampled 19 wells in Travis County aquifer 218EDRDA between 2010 and 2024, collecting 94 results for calcium and magnesium concentrations. All samples showed these minerals 'detected,' meaning instruments measured them consistently. The median concentration found was 346.5 mg/L, indicating half of the samples were below this level and half above. Concentrations ranged from 222.0 to 404.0 mg/L across all sampled wells.
This range reflects typical water hardness in the area’s aquifer but is not a measure of safety or violation—no federal safety thresholds were exceeded in this dataset. It only shows the variability people in Travis County might expect from groundwater sources.
How does treated water at the tap differ once the C-Series Spotty Dishes & Glassware System is in place?
The C-Series Spotty Dishes & Glassware System is designed to address mineral residue that causes spots on dishes and glassware. By conditioning or selectively reducing minerals that cause water hardness, this technology changes water chemistry at the tap so that after washing, dishes rinse more cleanly and dry spot-free.
Using this system means less manual polishing or frequent re-washing of glassware—saving time and improving kitchen convenience. Its design ships ready to configure for your home's setup.
How do sample depth, well depth, or water source type change what I should expect about mineral content?
Samples from Travis County wells in aquifer 218EDRDA ranged from 100 to 582 feet deep. Generally, deeper wells may encounter different mineral compositions than shallower ones, sometimes with higher mineral content. Surface water sources and municipal systems may also differ in mineral levels compared to groundwater.
Therefore, even within the same area, your water's hardness might vary depending on your source depth and type. Only a current, specific test of your water reveals your household’s actual conditions.
Which household symptoms suggest my water's causing spotted dishes, and which do not?
If your dishes and glassware frequently show spots or a cloudy film after washing and drying, this suggests your water has mineral deposits that are not rinsing away completely. You might notice similar scaling on faucets or inside kettles.
However, spotting can also result from dishwasher detergent type, water temperature, or drying methods. These factors are not due to mineral content. If you do not see spots but have other water concerns, those issues might stem from different causes unrelated to hardness minerals.
What should I not conclude from Travis County area water data regarding my own water?
The regional water data from Travis County offers valuable context on typical mineral concentrations but does not specify your home's water quality. No individual well or tap water sample is represented directly by this data. Mineral levels in your water may be higher or lower than the area median or range.
Importantly, detection of minerals in area samples is not a health or safety violation but an indication of naturally occurring water characteristics. To understand your water’s impact on dish spotting, a direct test of your household water is essential before choosing treatment options.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-02-14. 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 218EDRDA aquifer (Travis County): 94 results from 19 wells, median 346.5 mg/L, range 222.0-404.0 mg/L; none above any federal threshold