Distinguishing Chromium Types: Why Total Chromium Data Isn't Enough
Total chromium includes multiple forms
Total chromium measures all chromium species combined, including trivalent chromium and hexavalent chromium (chromium-6). These forms differ in chemical behavior and potential effects.
Hexavalent chromium requires separate consideration
Chromium-6 (hexavalent chromium, Cr(VI)) is chemically distinct and monitored separately in surveys. Total chromium levels do not reveal chromium-6 concentrations directly.
Sampling in Dickson shows chromium-6 detected throughout
The Water Authority of Dickson County's public water records show chromium-6 detected in all tested samples between 2013-2015, with measured levels ranging from 0.03 to 0.24 micrograms per liter (µg/L), or parts per billion (ppb).
Understanding the UCMR3 Survey and Its Household Limits
The survey sampled the public water system, not individual households
The federal Unregulated Contaminant Monitoring Rule 3 (UCMR3) measured chromium-6 in the Dickson County public water supply, covering surface water sources serving about 68,675 people through 25,530 connections.
Results are occurrence measures, not compliance tests
These chromium-6 measurements are detections indicating presence in the system but do not represent violations or unsafe levels. No health-based violations for chromium-6 were recorded in this system.
Your household’s chromium-6 level may differ
Because data reflect area-wide sampling, testing your own household water is necessary to know specific chromium-6 levels before choosing equipment.
Recognizing Household Symptoms Linked to Chromium-6
Chromium-6 presence generally lacks obvious sensory clues
Chromium-6 does not typically cause taste, odor, or appearance changes in water that a household can detect.
Symptoms often stem from other water issues
Water discoloration, staining, or unusual tastes usually arise from other elements or compounds and are not reliable indicators of hexavalent chromium.
Adjusting for Large Households, Second Homes, or Seasonal Properties
Water demand impacts equipment sizing for chromium-6 management
A larger household or frequently used second home typically requires equipment that handles higher volumes of water to maintain effective chromium-6 processing.
Seasonal properties need consideration for intermittent use
Properties used seasonally may face challenges such as equipment stagnation or maintenance that influence chromium-6 treatment choices.
Influence of Sample Depth, Well Depth, and Water Source Type
Surface water sources differ from well water in chromium speciation
In Dickson, the public supply uses surface water, so chromium-6 levels measured reflect that source type. Well water in the area may have different chromium forms or concentrations.
Sample depth in monitoring affects measured chromium-6 levels
Sampling at different points in the distribution system can show variability in chromium-6, so testing household water directly is important for accurate understanding.
Distinguishing Chromium-6 Issues From Similar Water Concerns
Chromium-6 is distinct from total chromium and other metals
Understanding hexavalent chromium's chemistry is essential to avoid confusing it with trivalent chromium or other metal contaminants which have different treatment needs.
Chromium-6 presence does not imply secondary aesthetic issues
Unlike compounds causing staining or taste problems, chromium-6 levels detected in Dickson do not correlate with such aesthetic water complaints.
Recommended Solution Based on Your Measured Demand and Needs
After testing your household's water for chromium-6 content and assessing your demand, consider the Pentair Chromium-6 Filter. This equipment ships ready to configure and is documented to address chromium(VI) effectively according to your specific water volume requirements.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-06-12. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Water Authority of Dickson County (TN0000191), TN: 48 results across 2 listed contaminants, 31 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L