Hempstead County’s Public Water System and Chromium-6
The Hope Water Light Community system supplies water to about 11,500 people via surface water sources. Water from this system undergoes treatment before reaching taps, but it can still contain trace levels of chromium-6 (hexavalent chromium or Cr(VI)), an element measured by federal surveys to help understand its presence and variability.
Trivalent Versus Hexavalent Chromium: Interpreting Total Chromium Data
Total chromium results do not specify chromium-6 levels
Total chromium measures all chromium forms combined, including chromium-3 (trivalent chromium), which differs chemically and in impact from chromium-6. Because these forms coexist, knowing total chromium alone cannot determine the concentration of chromium-6 specifically.
Chromium-6 is chemically distinct and monitored separately
Chromium-6 (Cr(VI)) is the hexavalent form recognized for its unique properties. Groundwater and surface water can contain varying amounts of this form based on environmental factors.
UCMR3 Survey Aims and Limitations for Household Water
UCMR3 measured chromium-6 across the Hope Water Light Community system (2013-2015)
During the Unregulated Contaminant Monitoring Rule (UCMR3) period, chromium-6 was detected in 7 of 16 samples from this system, with measured levels ranging from the reporting limit (0.03 micrograms per liter or parts per billion) up to 0.266 micrograms per liter, and a median detected value of 0.146 micrograms per liter.
Survey data reflect system-wide conditions, not individual household water quality
These results represent water samples from the public distribution system and cannot pinpoint the chromium-6 level in any specific home. Local plumbing and household plumbing devices may alter chromium-6 concentrations after water leaves the system.
Household Signs and Symptoms Related to Chromium-6
No direct sensory indicators linked to chromium-6 presence
Chromium-6 is tasteless and odorless at the low levels recorded by UCMR3 monitoring, so households cannot rely on smell, taste, or appearance to determine its presence.
Water discoloration or staining is not an indicator of chromium-6
Chromium-6 at typical detected levels does not cause visible staining, corrosion, or cloudiness in water.
What to Record Before Seeking Treatment Advice
Obtain a current water test that specifically reports chromium-6 levels
Testing your own water is essential since area data reflect system averages and do not indicate individual household status. Request analysis for hexavalent chromium measured in micrograms per liter or parts per billion.
Note your water source type and any treatment currently in use
Identifying whether your water comes from the public system, a private well, or other sources helps guide suitable treatment recommendations.
Document any health-based violations on your water system record
In Hempstead County, the Hope Water Light Community system has nine EPA-recorded health-based violations of various contaminants, but none specifically related to chromium-6. This does not mean chromium-6 levels are unsafe but highlights the importance of comprehensive water quality awareness.
Understanding Measured Chromium-6 Levels Against Federal Standards
No federal maximum contaminant level exists for chromium-6
Currently, the EPA has not established a federal maximum contaminant level (MCL) specifically for chromium-6. The total chromium MCL is 100 micrograms per liter, which covers all chromium forms combined.
Detected chromium-6 levels in Hempstead are well below total chromium limits
The highest chromium-6 reading of 0.266 micrograms per liter is far below the total chromium MCL. Therefore, these detections do not correspond to violations or regulatory exceedances.
Detection does not equate to a health finding or water contamination
A detection simply means the contaminant was measurable above the reporting threshold and does not imply any health risk or water safety concern by itself.
Final Notes on Area Data and What Not to Conclude
Residents should not assume that the reported chromium-6 concentrations precisely represent the levels in their household taps. Area-wide monitoring offers a snapshot for the public water system as a whole, not individual homes. Testing your own water is necessary for accurate information.
The chromium-6 detected in Hempstead’s public water system reflects low-level presence without any federal limit exceedance; it is a measured variable, not a violation or proof of risk.
For households seeking treatment options, the C-Series Chromium-6 Filter ships ready to configure and is engineered to address chromium(VI) in water. It provides a technology-backed solution after verification of your home’s specific water profile.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2015-12-07. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR3 monitoring (2013-2015) for Hope Water Light Comm. (AR0000230), AR: 32 results across 2 listed contaminants, 10 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L