What is the chromium-6 level in Brattleboro's water supply? According to federal monitoring data, chromium-6 (hexavalent chromium) is regularly detected in the Brattleboro Water Department's surface water system but at concentrations well below any federal health-based standards.
Ion Exchange Versus Reverse Osmosis for Chromium(VI)
Ion exchange and reverse osmosis are two common water treatment methods addressing chromium(VI). Ion exchange uses a resin to bind chromium-6 ions selectively, effectively reducing their concentration. Reverse osmosis forces water through a semipermeable membrane that physically blocks chromium-6 molecules along with many other dissolved substances, providing broad-spectrum contaminant reduction. Households seeking to manage chromium-6 should understand these differences when considering treatment options.
Sources of Hexavalent Chromium: Geology and Industry
Hexavalent chromium can originate naturally or from human activities. In arid, alkaline aquifers, geogenic sources can release chromium(VI) into groundwater. However, Brattleboro's water supply is surface water, and local data does not indicate industrial chromium contamination sources like plating or manufacturing discharges. This distinction matters because the source affects chromium's concentration and chemistry in water.
Sample Location and Depth Effects on Chromium Measurements
The depth and type of water source influence chromium-6 levels. Surface water supplies like Brattleboro's typically show different chromium profiles than deep wells. Monitoring in Brattleboro occurred at the system level, not individual taps or private wells, so household water can vary depending on local plumbing and point of use filters.
Differentiating Chromium-6 from Other Similar Water Issues
Chromium-6 is distinct from total chromium and other metal contaminants. While total chromium includes chromium in all oxidation states, hexavalent chromium is specifically chromium in a +6 oxidation state. Brattleboro's total chromium levels are also measured and well below the federal maximum contaminant level (MCL) of 100 micrograms per liter (parts per billion), indicating no health-based violation for chromium overall.
Seasonal and Multi-Year Variation in Chromium(VI) Levels
The federal Unregulated Contaminant Monitoring Rule (UCMR3) data for Brattleboro spans from September 2014 to June 2015. During this period, chromium-6 was detected in 11 out of 12 samples with a highest result of 0.15 micrograms per liter and a median of 0.08 micrograms per liter. This range shows consistent but low-level presence without exceeding any federal standards or limits.
How the C-Series Chromium-6 Filter Addresses Chromium(VI)
The C-Series Chromium-6 Filter ships ready to configure and utilizes selective ion exchange technology tailored to target hexavalent chromium ions. This technology reduces chromium-6 concentrations effectively by exchanging chromium ions with less problematic ions, thereby improving water quality for residential use. Households concerned about chromium-6 can consider this documented solution as a targeted approach to manage the constituent.
In summary, Brattleboro's public water system, serving over 12,000 people in Windham County, has documented chromium-6 detections well below any federal health-based limits according to EPA records. Understanding the nature of chromium(VI), its sources, and the differences in treatment approaches is essential. For specific conditions, household water testing is necessary to determine individual chromium-6 levels. The government data and detailed water quality records are available through the EPA's Safe Drinking Water Information System.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-06-24. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Brattleboro Water Department (VT0005290), VT: 24 results across 2 listed contaminants, 23 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L