Why are aesthetic secondary standards different from health-based limits when it comes to total dissolved solids?
In Duval County’s aquifer 120FLRD, total dissolved solids (TDS) have been measured in multiple wells. These TDS values reflect the concentration of minerals and salts dissolved in the water. The U.S. Geological Survey sampled 149 results from 13 wells, finding concentrations ranging from as low as 0.3 mg/L to as high as 1850 mg/L, with a median value of 306 mg/L. An aesthetic secondary standard for TDS is set at 500 mg/L, which is a threshold related to taste, staining, or corrosion potential rather than health effects. Importantly, exceeding this aesthetic threshold is not a violation of safety standards and does not imply the water is unsafe to drink. It only suggests that some users may notice changes in water taste or appearances such as scaling or staining.
What additional considerations does a commercial or industrial operator have compared to a household?
Commercial or industrial water users typically face different challenges from homeowners. They often require continuous water flow at higher volumes and have stricter specifications for water quality affecting equipment or product quality. Their concerns include regulatory compliance beyond aesthetic thresholds, potential health-based standards, and the impact of water constituents on large-scale systems. Households, in contrast, primarily focus on consistent daily demand and managing aesthetic effects like taste and staining. Thus, while a household will evaluate treatment capacity mainly to meet demand and comfort, commercial users add layers of legal and operational criteria.
How can a Duval County homeowner interpret the median and range of TDS results for their well water?
The median TDS concentration of 306 mg/L reflects the middle value of measurements recorded in the sampled wells across Duval County’s aquifer. This median suggests typical water quality in the area but does not guarantee that any individual well matches this figure. The broad range, from 0.3 mg/L to 1850 mg/L, indicates that some wells may have very low TDS while others have much higher levels. Homeowners should understand that their well's TDS concentration requires a specific test because local and well-specific geological factors can cause significant differences. Knowing the range encourages awareness that while many wells fall below the aesthetic threshold, some may exceed it and could require treatment tailored to the water's actual quality.
How does the Autotrol Complete Well System address total dissolved solids and treatment capacity for a household?
The Autotrol Complete Well System is designed to manage treatment demands in households where existing equipment may not keep pace with water use or quality challenges. With a grain capacity of 32,000, this system is capable of handling substantial volumes of water and prolonged use without frequent interruptions. Though not designed specifically to remove all dissolved solids, the system effectively conditions water to improve taste and reduce staining related to elevated TDS. By maintaining water quality within aesthetic preferences and supporting higher volume treatment, it helps households in Duval County manage well water more reliably when capacity is a limiting factor.
What does a certified laboratory test for total dissolved solids report, and how should homeowners read the results?
A certified laboratory test for TDS typically measures the total concentration of dissolved minerals and salts in the water, reported in milligrams per liter (mg/L). The report will indicate the precise TDS value for the specific sample, allowing homeowners to compare it to regional data and aesthetic secondary standards. It’s critical to remember that this result applies to the tested water only and cannot be assumed to reflect the entire well or other locations. A result below the 500 mg/L secondary standard suggests no aesthetic concerns, while values above it signal potential changes in taste or staining that might warrant treatment consideration.
The single test every Duval County homeowner should order is a certified laboratory analysis of total dissolved solids for their own well water. A TDS result at or below the aesthetic secondary standard of 500 mg/L can provide reassurance about typical water characteristics; a higher value may indicate the need for enhanced treatment capacity, such as the Autotrol Complete Well System, to manage water quality and volume effectively.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2014-08-07. 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 Total dissolved solids in the 120FLRD aquifer (Duval County): 149 results from 13 wells, median 306.0 mg/L, range 0.3-1850.0 mg/L; 32 above an AESTHETIC secondary standard only (secondary standard 500.0 mg/L (aesthetic)) - not a health finding
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