Why Aesthetic Secondary Standards Differ from Health-Based Limits, Applied to Chromium-6
Detection Does Not Indicate a Health Violation
The City of Elko public water system, which serves over 23,000 residents, has documented chromium-6 detected in all samples taken between 2013 and 2015. While chromium-6 was present, there are no EPA health-based violations recorded for this system. This distinction means chromium-6 detections are measurements, not indications of unsafe water.
Secondary Standards Guide Appearance and Taste, Not Safety
While aesthetic secondary standards exist for some constituents to manage taste or staining, no such federally enforceable health standard currently applies to chromium-6. Thus, exceeding secondary benchmarks does not imply a health risk or legal violation.
What 'Detected', 'Median', and 'Range' Mean in the Sampling Record
'Detected Above Reporting Level' Means Measurement Confirmed
Chromium-6 was detected in all 68 tested samples with concentrations above the reporting limit of 0.03 micrograms per liter, confirming presence in source water. Detection confirms measurement but not concentration at any specific residential tap.
Median and Highest Values Represent Sampling, Not Individual Homes
The median concentration was 0.685 micrograms per liter; the highest detected was 1.3 micrograms per liter. These values reflect the water system samples during the monitoring period and do not specify conditions in any single household supply.
What Distinguishes Chromium-6 from Commonly Confused Water Problems
Chromium-6 Versus Total Chromium
Total chromium includes chromium-6 and chromium-3 forms. Total chromium levels were also detected consistently but remain well below EPA's 100 micrograms per liter limit for total chromium, reaffirming regulatory compliance.
Chromium-6 Is Different from Other Metals or Aesthetic Issues
Chromium-6 presence should not be mistaken for problems like hardness or iron staining. Its detection focuses on a different chemical property and requires specific testing to confirm.
How the Documented Treatment Technology Removes or Neutralizes Chromium-6
Treatment via the C-Series Chromium-6 Filter
The C-Series chromium-6 filter is engineered to reduce chromium-6 from household water by filtering out the specific hexavalent form. This system ships ready to configure for residential water use, providing a targeted approach based on known chemistry and treatment capacity.
Questions Commercial or Industrial Operators Add That a Household Does Not
Scale and Consistency Considerations
Commercial users consider daily water demand, regulatory reporting, and possible occupational exposures, which differ from residential concerns primarily focused on household water quality and usability.
Compliance and Testing Frequency
Commercial operators often face more frequent testing and compliance standards, whereas residential customers focus on periodic testing to confirm treatment effectiveness.
What You Should Write Down Before Seeking Treatment Advice
Sample Information and Test Results
Note the sampling dates, chromium-6 concentration range, and water system identity. Confirm whether your water source aligns with the City of Elko system or a different supply.
Household Water Use Details
Document your household size, daily water use estimates, and any known water treatment systems already in place to help tailor advice.
What Not to Conclude from Area Data
Area Data Does Not Define Your Home’s Water Quality
Government sampling results represent the public water system broadly and do not establish the chromium-6 level in any individual household’s water. Only a laboratory test of your specific water supply can provide that information.
No Indication of Unsafe Conditions
The City of Elko's water system record shows no EPA health-based violations for chromium-6 or total chromium, underscoring compliance with federal health standards during the monitoring period.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-03. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for City of Elko (NV0000272), NV: 136 results across 2 listed contaminants, 136 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L