1. What the UCMR3 Nationwide Survey Tells Us and Its Limits for Your Home
The Environmental Protection Agency (EPA) conducted a monitoring program called the Unregulated Contaminant Monitoring Rule 3 (UCMR3) from 2013 to 2015. This survey gathered data on various contaminants in public water systems across the country but was not intended as a compliance or safety test for individual homes. For Fayetteville's Cliffdale West public water system, which serves over 15,000 people in Cumberland County, groundwater was tested extensively for chromium-6 or hexavalent chromium (Cr(VI)). Results showed chromium-6 was detected in 82 out of 99 samples, with a highest measured concentration of 1.9 micrograms per liter (µg/L or parts per billion). However, these results represent the water system as a whole and do not specify the chromium-6 level at any individual household's tap.
2. Trivalent Chromium versus Hexavalent Chromium: Why Total Chromium Results Are Not Enough
Chromium in water exists primarily in two states: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). The EPA has set a maximum contaminant level (MCL) for total chromium at 100 µg/L, which includes both forms. Hexavalent chromium, or chromium-6, is chemically different and may have distinct health and aesthetic considerations. The Cliffdale West system's monitoring found a median chromium-6 level of 0.0745 µg/L in detected samples and total chromium median at 0.285 µg/L. Since total chromium combines both forms, the presence of chromium-6 can't be inferred from total chromium measurements alone, making specific identification important for a household concerned with chromium-6.
3. How the Autotrol Chromium-6 Filter Addresses Hexavalent Chromium
When a household identifies a need to manage chromium-6 in their water, the Autotrol Chromium-6 Filter offers a direct-purchase option designed to specifically target and treat hexavalent chromium. This technology uses a filtration process that reduces chromium-6 concentrations by transforming or capturing this form, thereby lowering its presence in the water supplied at the point of use. The unit ships ready to configure and connects to a home's water supply line without requiring additional services or adjustments.
4. Consequences of Leaving Chromium-6 Untreated Over Time
Long-term exposure to chromium-6 in drinking water has been a subject of scientific study and regulatory interest. While EPA has not established a federal MCL for chromium-6, prolonged ingestion at elevated levels has been linked to health concerns in some research. The Cliffdale West system’s data show chromium-6 well below levels regulated for total chromium, but households with personal water sources or concerns might consider treatment to reduce chromium-6 presence over many years to mitigate potential risks related to consumption.
5. Measuring Treatment Capacity Against Household Water Use
To determine if a treatment device like the Autotrol Chromium-6 Filter fits your home’s needs, consider daily water demand. Typical residential water usage averages about 80 to 100 gallons per person per day. The filter’s capacity must accommodate peak and average consumption volumes while effectively managing chromium-6 concentrations found in the source water. This ensures continuous treatment without sacrificing water flow or quality.
6. The Reason Behind California’s 10 µg/L Chromium-6 Limit and Its Implications
California has set a state-specific chromium-6 drinking water limit of 10 micrograms per liter, based on state health objectives and scientific assessments. This limit helps guide consumers and water suppliers in managing chromium-6 risks. Though Fayetteville’s system measurements are significantly below this level, the California standard illustrates a precautionary approach that some states adopt. It encourages residents elsewhere, including Cumberland County, to monitor chromium-6 and consider treatment options if their own water tests show elevated levels.
Closing: What You Should Not Conclude from Area Data Alone
While public water system data provide important context for chromium-6 levels in Fayetteville's Cumberland County, these figures do not reveal the exact chromium-6 concentration in your household water. Individual water quality depends on plumbing, storage, and home-specific factors. Testing your own water source is essential to determine whether chromium-6 levels require action. The area data serve as a guide but do not replace direct testing and evaluation. For those concerned, the Autotrol Chromium-6 Filter is a documented, ready-to-configure technology to reduce chromium-6 presence, offering peace of mind when your water has been tested and treatment is needed.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-11-13. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Cliffdale West (NC0326332), NC: 198 results across 2 listed contaminants, 110 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L