Reading Laboratory Reports for Chromium-6 in Your Water
Test Report Entries Typically Include:
- Hexavalent chromium concentration in micrograms per liter (µg/L) or parts per billion (ppb)
- Total chromium measurement, which combines multiple chromium forms
- Reporting limits that set the minimum detected concentration
- Dates and locations of sampling
A household water test report clearly differentiates chromium-6 (Cr(VI)) from total chromium, since chromium-6's toxicology differs significantly from chromium(III).
Trivalent Versus Hexavalent Chromium: Why Total Chromium Alone Is Insufficient
Differences That Matter:
- Trivalent chromium (chromium(III)) is an essential nutrient in trace amounts and less bioavailable
- Hexavalent chromium (chromium-6) is more chemically active and has been studied separately for health effects
- Total chromium tests combine both but cannot identify chromium-6 levels precisely
- A total chromium reading within standards does not confirm low chromium-6 presence
Geogenic Chromium-6 Sources Versus Industrial Contributions
Common Origins in Leavenworth Area:
- The Leavenworth Water Department uses surface water which can collect chromium-6 from natural rock leaching
- Industrial activities may add chromium-6, but local records show no health-based violations
- The measured chromium-6 concentrations are below federal maximum contaminant levels for total chromium
- Understanding your water's source helps clarify whether chromium-6 is geogenic or industrial
Ruling Out Causes: A Stepwise Approach
What to Consider Before Testing:
- Check recent local water quality reports—Leavenworth sampling shows chromium-6 detected at a median of 0.085 µg/L
- Evaluate any changes in water taste, color, or staining, though these are typically unrelated to chromium-6
- Consider if your current household water treatment is adequate or struggling with chromium-6
- Order an independent laboratory test for chromium-6 specifically to understand your home's water
Understanding Sampling Results: Detected, Median, and Range in Context
Interpreting Leavenworth Water Department Data:
- All 16 chromium-6 samples detected levels above the reporting limit of 0.03 µg/L
- The highest chromium-6 detected was 0.13 µg/L, with a median at 0.085 µg/L
- Total chromium showed 11 detections above 0.2 µg/L, with a highest reading of 0.5 µg/L
- These figures represent measurements, not violations, and are within federal safety criteria for total chromium
Sample Size and Meaning: What 16 Samples Tell You
Limitations and Strengths of the Dataset:
- Sixteen samples reflect a limited but federally standardized monitoring effort
- Sampling covers the public system, not individual household variations
- Smaller sample sizes mean individual homes may have different chromium-6 levels
- Consistent detection indicates chromium-6 presence but not concentration for any specific home
The UCMR3 Survey: Goals and Household Implications
What This Nationwide Monitoring Means for You:
- Designed to gather occurrence data on unregulated contaminants including chromium-6
- Provides a snapshot of chromium-6 presence in public water systems, including Leavenworth
- Not intended for compliance or health-based violation determinations
- Helps inform research and regulatory consideration but does not substitute for home-level testing
Recommended Testing to Clarify Your Household Water Quality
To understand chromium-6 concentration in your own water precisely, order a specific laboratory analysis for chromium-6. A result below detection or close to the system's median (around 0.085 µg/L) can help determine if additional water treatment is warranted. If test results show chromium-6 levels are challenging your existing water treatment, the C-Series Chromium-6 Filter ships ready to configure and is designed to support homes needing to address chromium-6 more effectively.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-14. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Leavenworth Water Department (KS2010317), KS: 32 results across 2 listed contaminants, 27 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L