Government groundwater sampling in Gwinnett County’s aquifer 320CRSL found calcium and magnesium concentrations related to scale formation consistently detected in 13 samples from 9 wells over 2010 to 2013. The median concentration was 96.3 mg/L with a range from 62.1 to 118.0 mg/L, all measured in wells 280 to 600 feet deep. These figures reflect typical regional groundwater but do not specify conditions in any one household well or tap water.
If you leave scale formation untreated in your water heater for years
Scale deposits accumulate gradually as calcium and magnesium minerals precipitate during water heating. Over time, scale reduces heat transfer efficiency, increasing energy use and potentially shortening the heater’s lifespan. Scale buildup can also reduce water flow through pipes and fixtures. However, the effect's timing and severity vary with water chemistry, temperature, and water use.
If you consider seasonal or multi-year variations in groundwater hardness in Gwinnett County
The government record indicates measurements taken from June 2010 through June 2013. Across this multi-year span, hardness values remained consistently detected and within the specified range. This suggests relative stability in groundwater mineral content in aquifer 320CRSL over typical seasonal or annual cycles, although individual local wells can differ.
If you want to compare Gwinnett County’s water scale potential with a neighbouring county
When comparing this area's sampled hardness to neighboring regions, note that differences in aquifer geology and well depths can affect calcium and magnesium levels. However, such area-wide comparisons should not be used to infer the exact scale risk in a specific household. Test results from your own source water are essential for accurate assessment.
If you consider public water system records versus private well testing
Public system water quality reports typically reflect treated surface or groundwater, tested at central points and follow regulatory standards. Private well testing, especially for hardness, is necessary to identify household-specific scale risks. The government sampling cited here is from private wells, providing regional context but not individual water conditions.
If you wonder why secondary standards for minerals like calcium and magnesium differ from health-based limits
The calcium and magnesium concentrations measured relate to aesthetic secondary standards—factors influencing taste, water clarity, and scale formation, not health risks. None of the samples exceeded federal health-based regulatory thresholds. Scale formation is primarily a functional and maintenance concern instead of a safety issue.
If your well depth or water source differs from those sampled in aquifer 320CRSL
The sampled wells ranged from 280 to 600 feet deep, representing deep groundwater conditions. If your household well is shallower or draws from a different source type, water mineral content may vary. Testing your specific water is necessary to determine your water heater scale risk and appropriate response.
This summary is based on government measurements from 13 water hardness results collected between 2010 and 2013 from nine wells in Gwinnett County’s aquifer 320CRSL, reflecting regional groundwater characteristics. For more details, see the U.S. Geological Survey groundwater sampling data at waterdata.usgs.gov.
To address ongoing scale buildup when existing equipment falls short, the Autotrol Scale in the Water Heater System provides a documented technology for managing mineral deposits effectively, shipping ready to configure for residential use.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-06-18. 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 320CRSL aquifer (Gwinnett County): 13 results from 9 wells, median 96.3 mg/L, range 62.1-118.0 mg/L; none above any federal threshold
- ✓ 90-Day Money-BackNo restocking fees — return within 90 days.
- ✓ Manufacturer WarrantyGenuine Fleck · Pentair · VIQUA equipment.
- ✓ Free Expert SizingTalk to a specialist and buy the right system the first time.