Fleck Chromium-6 Filter

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Step 1: Why California set its own 10 µg/L chromium-6 limit and what that history means for a reader elsewhere

California established a public health goal of 10 micrograms per liter (µg/L), or parts per billion (ppb), specifically for hexavalent chromium (chromium(VI)) in drinking water because early scientific assessments suggested potential health concerns at higher levels. This state-level threshold is unique and does not represent a federal Maximum Contaminant Level (MCL). In places like Roanoke City, where federal regulations apply, no specific MCL exists for chromium-6. Therefore, while California’s limit frames one cautious approach to water quality, it does not impose a legal standard here. Households should consider this context as a point of reference, not as a regulation or an immediate indication of unsafe water.

Step 2: What the reader should write down before asking anyone for treatment advice

Before seeking equipment or treatment suggestions to address chromium-6, document your water source type and any recent water quality results you have, such as lab report details. Note your location within Roanoke City and any prior water equipment used, especially since prior household technology was not meeting expectations. Also record any specific water quality concerns you observe, such as taste, staining, or odors, even though these are not direct indicators of chromium-6 levels. This information helps tailor advice to your household’s unique situation and ensures consideration of local water context.

Step 3: What the UCMR3 nationwide survey was designed to learn, and its limits for one household

The Unregulated Contaminant Monitoring Rule 3 (UCMR3) survey conducted by the EPA between 2013 and 2015 collected data on hexavalent chromium in the Western Virginia Water Authority system serving Roanoke City. This survey measured occurrence in source and treated water samples but is not a compliance test or a household-specific evaluation. It provides a broad snapshot of the system’s water and helps regulators understand contaminant prevalence. For individual homes, results may vary significantly, so direct testing of your household water is crucial if you want to know your specific chromium-6 concentration.

Step 4: How to compare this area's record with a neighbouring county's without overreading it

When comparing chromium-6 findings from Roanoke City with those from adjacent counties, consider the source water differences, population served, and sampling methods. For example, Roanoke’s data showed 57 samples with 45 positive detections for chromium-6 ranging up to 0.8 µg/L, while neighboring areas might have lower or higher medians or maximums. Such comparisons indicate regional trends but do not determine individual home water quality or safety. Avoid assuming your water matches the system-wide numbers without a specific test.

Step 5: What 'detected', 'median' and 'range' mean in the sampling record on this page

In the EPA data, 'detected' means the measurement instrument found chromium-6 at a level above its minimum reporting threshold of 0.03 µg/L—this is not the same as a health violation. The 'median' of detections (0.13 µg/L) represents the middle value when all detected levels are ordered from low to high, helping to describe typical concentrations found. The 'range' or highest detected value recorded was 0.8 µg/L. These figures show presence and extent of chromium-6 in the water system but do not predict your household’s water quality precisely.

Step 6: Why aesthetic secondary standards differ from health-based limits, applied to this constituent

Aesthetic secondary standards relate to water characteristics like taste, odor, color, or staining potential rather than health risks. Although chromium compounds can influence water appearance or taste, no aesthetic limit governs chromium-6 levels. Health-based federal regulations only set a maximum contaminant level for total chromium at 100 µg/L, which includes all chromium types, far above detected chromium-6 levels in Roanoke City's water. Understanding this difference helps when assessing whether water issues are an aesthetic nuisance or a health consideration requiring treatment.

In conclusion, the local government data for Roanoke City shows chromium-6 is present in the municipal water system but well below any federal health limits. To understand your specific household water, a certified laboratory test for chromium-6 is necessary. Following this, equipment such as the Fleck Chromium-6 Filter ships ready to configure and offers a documented approach for managing chromium(VI) in residential water, especially important after prior equipment failure.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-12-17. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Western Virginia Water Authority (VA2770900), VA: 114 results across 2 listed contaminants, 78 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L