Understanding the UCMR3 Survey and Its Household Limits
The Purpose of the UCMR3 Nationwide Survey
The EPA’s third Unregulated Contaminant Monitoring Rule (UCMR3) collected data from public water systems, including Sunrise Water Authority in Clackamas County, OR. It sampled chromium-6 levels in surface water sources from 2013 to 2015 to understand broader occurrence patterns.
Limitations for Individual Household Implications
These data represent system-wide measurements, not specific household plumbing or well water. Individual household chromium(VI) concentrations can differ and require direct testing. The survey detects presence but does not define safety or violation status.
The California Chromium-6 Guideline and Its Regional Meaning
Why California Set a 10 µg/L (ppb) Advisory Limit
California issued a public health goal of 10 micrograms per liter for chromium(VI) based on toxicological studies. This advisory guides treatment considerations but is not a federal enforceable standard.
Implications for Clackamas County Residents
The EPA record shows no health-based chromium-6 violations for Sunrise Water Authority, although levels up to 1.7 µg/L were detected, below California’s advisory. This means local water meets federal safety records but individual concerns may justify treatment choices.
Sources of Chromium(VI) in Clackamas County Water
Natural and Man-Made Origins
Chromium(VI) can enter surface water through natural erosion of mineral deposits and industrial activities. In Clackamas County, surface water supply is subject to these influences, contributing to the detected chromium-6 levels.
Distribution System Considerations
Chromium(VI) presence in treated water reflects source water quality; it is not introduced by plumbing materials, which mainly affect other contaminants.
Testing and Evaluation Steps for Households
Start with the Water Source
Verify whether your water provider is Sunrise Water Authority or another system, since chromium(VI) occurrence varies by source. If using a private well, testing is essential.
Check Basic Water Quality Indicators
Routine water quality testing can rule out other issues before focusing on chromium(VI). This is a lower-cost first step.
Conduct Specific Chromium(VI) Testing
Only laboratory testing designed to quantify hexavalent chromium provides accurate household-level data to inform equipment choices.
Fixtures and Uses Most Affected by Chromium-6
Where Chromium(VI) Impacts Are Noticed First
Chromium(VI) can affect taste and staining in water fixtures and appliances. Faucets and water-using appliances are where treatment benefits are most apparent.
Focus on Drinking and Cooking Water Points
Equipment configured for chromium-6 treatment is most valuable for fixtures providing water for consumption and food preparation.
Interpreting 'Detected', Median, and Range in Sampling Records
What 'Detected' Means in This Context
Detection above 0.03 µg/L means the analytical method measured chromium(VI) presence, not that levels exceed safety limits.
Understanding the Median and Highest Values Reported
The median of detected chromium(VI) is 0.125 µg/L, with a highest reported of 1.7 µg/L. These values reflect system-wide conditions from multiple sampling points over time, not an average household level.
Why These Numbers Don’t Indicate a Violation
Since no federal maximum contaminant level (MCL) for chromium-6 exists, and total chromium MCL is 100 µg/L, these detections do not imply noncompliance with regulations.
Overall, the EPA's public water system data for Sunrise Water Authority serve as a guide to chromium(VI) occurrence in Clackamas County surface water but do not define the specific conditions of any single household. Direct testing and thoughtful selection of treatment equipment, such as the Pentek Chromium-6 Filter that ships ready to configure, are recommended for those aiming to manage chromium-6 concerns based on personal water quality analysis.
For more detailed government data, refer to the EPA's UCMR3 public water system records for Sunrise Water Authority.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-07-28. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Sunrise Water Authority (OR4100635), OR: 60 results across 2 listed contaminants, 45 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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