A Worked Example: Reading Median and Maximum Chromium-6 in MP's Public Water System
The public water system record for Commonwealth Utilities Corp. (Saipan) serving MP connections shows that chromium-6 was detected in all 46 samples taken between 2015 and 2016, with a median concentration of 0.755 micrograms per liter (µg/L) and a highest measured value of 7.2 µg/L. These figures represent the central tendency and upper range of chromium-6 found across the system's supply points during that period, not any individual household's water. Understanding this median and range helps put a household's own test results in context.
What Do 'Detected', 'Median', and 'Range' Indicate in the Chromium-6 Sampling Record?
In this record, 'detected' means that measurement instruments found chromium-6 above the reporting threshold of 0.03 µg/L in every sample. The 'median' concentration is the middle value when all measurements are arranged from lowest to highest, showing a typical level throughout the system. The 'range' extends from the lowest detection (just above 0.03 µg/L) to the highest measured (7.2 µg/L), indicating variability in chromium-6 across samples. This information does not represent a violation or unsafe condition; no health-based federal limits exist for chromium-6, and the total chromium levels recorded remain well below the 100 µg/L maximum contaminant level (MCL) for total chromium.
What Should You Record Before Evaluating Treatment Options?
Before considering household water treatment, note the following:
- Your home's specific chromium-6 concentration from a certified laboratory test.
- Water source type and any known system updates or changes since the 2015-2016 monitoring.
- Other water quality parameters that may affect treatment choice.
Gathering this data will provide clarity when selecting treatment technologies appropriate for your water conditions.
How Does Treated Water Differ at the Tap When Using the Autotrol Chromium-6 Filter?
Once configured, the Autotrol Chromium-6 Filter acts on water entering your household, reducing chromium-6 concentrations by targeting the constituent specifically. Treated water delivered at faucets and appliances typically shows significantly lowered chromium-6 levels compared to untreated water, improving water quality based on your household's own test results. This system operates continuously to maintain consistent water quality without altering other water characteristics.
How Does Seasonal or Multi-Year Variation Appear in the MP Chromium-6 Record?
The monitoring data from February 2015 through June 2016 reflects chromium-6 levels over roughly 16 months. Within this timeframe, concentrations varied from just above the reporting level (0.03 µg/L) up to 7.2 µg/L, demonstrating variability likely influenced by source water changes, environmental factors, and treatment system adjustments. Long-term seasonal trends are not detailed here, so individual household testing over time is recommended to understand local fluctuations.
How the Autotrol Chromium-6 Filter Removes or Neutralizes Chromium-6
The Autotrol System uses specialized filtration media designed to target chromium-6 molecules, effectively reducing their presence in water before use. This technology traps chromium-6 ions while allowing desirable minerals to pass through, preserving overall water balance. Its design enables straightforward operation and maintenance tailored for residential needs, providing a dependable means to address chromium-6 concerns identified by household testing.
What You Should Not Conclude from MP Public Water System Chromium-6 Data
It is important not to infer that your household's water has a chromium-6 concentration equal to the median or highest values reported for the system. These figures describe the broader water system's sampling results and not individual home water. Without specific testing of your residence's water, precise chromium-6 levels remain unknown. Also, the presence of detected chromium-6 does not mean the water is unsafe or violates any federal limits, since no health-based maximum contaminant level exists for chromium-6 and the total chromium levels are well under established federal limits.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2016-06-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Commonwealth Utilities Corp. (Saipan) (MP0000001), MP: 93 results across 2 listed contaminants, 93 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L
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