Many households in Johnson, Pettis, and Saline counties notice a slight metallic taste or unexplained changes in water clarity at faucets and question whether chromium-6 might be a factor. This page reviews regional public water system data and weighs common approaches to dealing with hexavalent chromium, also called chromium(VI) or Cr(VI), in household water.
Trivalent Versus Hexavalent Chromium: Why Total Chromium Levels Don’t Give You the Full Picture
Chromium appears in water mainly in two oxidation states: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI)). While total chromium measurements combine both, they don’t differentiate between the less mobile Cr(III) and the more reactive, and sometimes more concerning, Cr(VI). According to the EPA's Unregulated Contaminant Monitoring Rule (UCMR3) data for the Pettis/Johnson/Saline Public Water Supply District #1 serving Saline, Johnson, Pettis, and Saline counties, total chromium was detected in 6 out of 32 samples with a highest value under 1 microgram per liter (µg/L or parts per billion). Hexavalent chromium was detected in 15 out of 32 samples with a highest result of 0.94 µg/L. This indicates that chromium(VI) comprises only a portion of total chromium in this water system. Since no federal maximum contaminant level (MCL) exists for chromium-6, total chromium standards do not directly apply to Cr(VI) concerns.
How Ion Exchange and Reverse Osmosis Address Chromium-6 Differently
When considering household water treatment focused on chromium(VI), two main technical approaches stand out: ion exchange and reverse osmosis. Ion exchange uses resin to selectively capture chromium-6 ions from water. It is effective at targeting chromium(VI) specifically and can treat larger volumes efficiently, making it suitable for households with higher water demand or whole-house applications. Reverse osmosis employs a semipermeable membrane to filter out many dissolved contaminants, including chromium(VI), but also removes minerals and can reduce water pressure, making it better for point-of-use treatment like kitchen taps. Both methods ship ready to configure and require regular maintenance.
What Changes When Serving Larger Households, Second Homes, or Seasonal Properties
Water usage patterns influence how chromium(VI) treatment techniques perform. Large households using more water daily may favor ion exchange systems for their capacity and ease of delivering treated water throughout the home. Seasonal or second homes with intermittent use might lean toward reverse osmosis at specific taps, balancing lower water treatment volumes with convenience. The regional chromium-6 data from the Pettis/Johnson/Saline PWSD #1 system suggest chromium-6 detections vary but remain below 1 µg/L, factors which might affect system sizing and maintenance schedules.
The Logical Steps to Assess and Address Chromium(VI) in Your Household Water
Before choosing treatment equipment, begin with simple checks such as noticing taste or staining, followed by testing your household water to identify chromium-6 levels specifically. Testing helps confirm if your water reflects regional conditions or if your well or connection has different chromium concerns. Accredited laboratories can measure chromium(VI) directly. This step is essential because the public water system sampling covers broad service areas and does not represent individual household water quality precisely.
Understanding Detected Values, Medians, and Ranges in Regional Chromium-6 Sampling
The EPA’s record notes 15 detected values for chromium-6 above a reporting limit of 0.03 µg/L out of 32 samples, with a median detected value of 0.045 µg/L and a highest measurement of 0.94 µg/L. These figures describe the range and frequency of chromium-6 presence in the public water system, not exceedances of health-based limits. Detected does not mean unsafe; it means that instruments measured chromium-6 at those concentrations during monitoring between 2013 and 2015. Understanding these statistics helps inform whether treatment options are worthwhile but does not replace direct testing of your water.
How the Fleck Chromium-6 Filter Responds to Hexavalent Chromium in Household Water
The Fleck Chromium-6 Filter uses ion exchange technology tailored to reduce hexavalent chromium concentrations in household water. It operates by attracting chromium(VI) onto its resin material, effectively lowering chromium-6 levels before the water reaches taps. This method is suited for whole-home treatment, providing treated water consistently where needed. The equipment ships ready to configure and is designed for straightforward upkeep with periodic resin replacement or regeneration cycles.
While the regional data from Johnson, Pettis, and Saline counties do not indicate chromium-6 levels that breach federal maximum contaminant levels (which do not exist specifically for chromium-6), awareness of detected concentrations helps residents weigh treatment choices. Testing your own water supplies the precise information needed to decide whether the documented Fleck technology or alternative methods best fit your household’s needs.
Do not conclude from area-wide data alone that your individual home's water contains chromium-6 at the same levels. Confirming your water’s quality through specific testing is the necessary next step before selecting treatment equipment.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2014-10-07. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Pettis/Johnson/Saline PWSD #1 (MO3021332), MO: 64 results across 2 listed contaminants, 21 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L