Understanding Montgomery County's Water and Chromium-6 Presence
The North Penn Water Authority in Montgomery County supplies surface water to over 91,000 people across nearly 36,000 connections. Between 2013 and 2015, federal sampling under the Unregulated Contaminant Monitoring Rule detected chromium-6—also called hexavalent chromium or Cr(VI)—in the water system. Chromium-6 was found in 38 out of 50 samples at concentrations above 0.03 micrograms per liter (µg/L or parts per billion), with the highest recorded level at 1.2 µg/L and a median detected concentration of 0.08 µg/L. Importantly, there are no health-based violations recorded for this water system, and total chromium levels remain well below the EPA’s maximum contaminant level of 100 µg/L.
Why California’s 10 µg/L Benchmark Matters Here
California’s Hexavalent Chromium Limit Origins
California enacted a public health goal of 10 µg/L for hexavalent chromium based on toxicological evaluations. While this is not a federal enforceable limit, it guides awareness about potential health concerns over long-term exposure to chromium-6 in drinking water. Montgomery County’s detected chromium-6 levels are mostly below this benchmark, reflecting generally lower concentrations compared to areas that prompted California’s regulation.
Applicability to Montgomery County Households
This benchmark helps households gauge whether specific treatment approaches targeting chromium(VI) might be worthwhile. Since concentrations vary by location and system, households should still test their own water to confirm whether chromium-6 is present at levels meaningful for treatment decisions.
How Ion Exchange and Reverse Osmosis Differ in Addressing Chromium(VI)
Ion Exchange Capabilities
Ion exchange technology targets chromium-6 by exchanging chromium ions in the water with less problematic ions, effectively reducing hexavalent chromium concentrations. This process typically supports higher water throughput and may be better suited for larger households or higher water use scenarios.
Reverse Osmosis Specifics
Reverse osmosis filters water through a membrane that captures chromium(VI) among other dissolved solids. It is highly effective in reducing chromium-6 but usually provides a lower flow rate and generates some wastewater, which may influence suitability for a household depending on water demand and conservation priorities.
Interpreting Sampling Terms in Montgomery County’s Record
What 'Detected' Means
Detection indicates that chromium-6 was measured above the reporting level of 0.03 µg/L. It does not imply contamination or exceedance of safety limits, merely that the constituent was found by the monitoring instrument.
Median and Range Explained
The median of detections (0.08 µg/L) represents the middle value among detected chromium-6 concentrations, giving a sense of typical levels. The range (up to 1.2 µg/L) shows the variability across samples from different times or locations within the system.
Steps to Evaluate Your Household’s Chromium-6 Status
Check Your Local Water Quality Report
Start by reviewing the latest water quality data from your public water supplier, which reflects general regional conditions.
Test Your Specific Water Supply
Because area data represents averages and multiple sampling points, individual household water testing is needed to know the exact chromium-6 concentration at your tap.
Assess Water Demand Versus Treatment Capacity
When considering chromium-6 treatment, compare expected daily water use in your home with the capacity of treatment technologies to ensure adequate supply without frequent maintenance or replacement.
What Montgomery County Area Data Does Not Show
The available chromium-6 sampling reflects general water system conditions and is not a direct measure of any single home’s water. The presence of chromium-6 detections at levels below California’s 10 µg/L public health goal does not imply the water is unsafe. Testing your own water is the only way to determine if chromium-6 is a concern for your household. For those seeking targeted treatment to address chromium(VI), the C-Series Chromium-6 Filter ships ready to configure and employs technology suited to reduce this constituent in residential water supplies.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-10-07. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for North Penn Water Authority (PA1460034), PA: 100 results across 2 listed contaminants, 43 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L