Purpose and Scope of the UCMR3 Survey for Hexavalent Chromium
The U.S. Environmental Protection Agency’s Third Unregulated Contaminant Monitoring Rule (UCMR3) conducted from 2013 to 2015 collected data on chromium-6, also known as hexavalent chromium or chromium(VI), across various public water systems. In Pulaski County, the Central Arkansas Water system supplied surface water to over 360,000 people and detected chromium-6 consistently above its 0.03 micrograms per liter (µg/L) reporting level, with a highest measurement of 0.104 µg/L (0.104 parts per billion). This survey was designed to understand nationwide occurrence but is not intended to precisely define levels at individual households or wells, as local variations in plumbing and water use can affect actual exposure.
California’s Chromium-6 Guideline and Its Broader Implications
California established a public health goal of 10 µg/L for chromium-6 in drinking water, a figure derived from scientific assessments of potential health risks over time. This limit, while authoritative in California, serves as a cautionary benchmark rather than a nationwide regulatory standard. For residents of Pulaski County, the recorded chromium-6 levels in public water are well below this number, providing context within a broader risk framework. Understanding how this state guideline contrasts with federal monitoring can assist consumers in evaluating what concentrations mean within their own water consumption decisions.
Public Water Records Versus Private Well Testing: Distinctions in Data
Public water system monitoring results, such as those reported by Central Arkansas Water, represent composite data from multiple sampling locations and times, indicating overall system water quality. This differs from testing a private residential well or tap water, which reflects a discrete point of use. To determine actual chromium-6 presence in a home’s water, individual testing is necessary. Public records do not establish individual levels or guarantee uniformity in water composition, especially for private well users. Understanding this distinction is essential before considering treatment options or making water quality assumptions.
Assessing Treatment Needs Against Household Water Use
When evaluating treatment solutions capable of addressing chromium-6, households must consider daily water demand. A household with a higher volume of water use requires equipment sized to manage the load consistently. Treatment technology such as the C-Series Chromium-6 Filter ships ready to configure and is designed to address chromium(VI) at the point of water entry. Matching treatment capacity with household water consumption ensures effective management of chromium-6 levels, avoiding overburdening the system or compromising performance.
Considerations for Larger, Seasonal, or Multiple Residences
Variables arise when water treatment is needed for larger families, second homes, or seasonal properties. A large household may exceed typical daily water usage assumptions, necessitating more robust filtration capacity or multiple units. Seasonal usage patterns, such as infrequent occupancy, may affect water quality and require maintenance considerations for the filter system to prevent stagnation or biofilm buildup. Owners of multiple homes in the Pulaski County area should assess each location’s water source and usage patterns separately to select appropriate chromium-6 treatment configurations.
In summary, the Central Arkansas Water system’s EPA UCMR3 data provides valuable regional insight into chromium-6 presence for Pulaski County residents. While detections of chromium(VI) above the reporting level occurred, they remain below health-based violation thresholds and far lower than the California guideline. Individual water testing is the definitive step to establish a home’s chromium-6 content. For those seeking treatment, considering household demand and property use patterns will guide appropriate equipment choices. This information draws solely from the EPA SDWIS public water system record available at the official EPA website.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-11-09. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Central Arkansas Water (AR0000465), AR: 32 results across 2 listed contaminants, 19 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L