Autotrol Chromium-6 Filter

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How Oxidation State Changes Between the Well, the Distribution Main and the Tap

Hexavalent chromium presence varies by water chemistry

The chromium detected in Wailuku's public water system is present predominantly as hexavalent chromium (chromium-6, Cr(VI)), a form distinct from other chromium states. Oxidation state transformation can occur naturally as water moves from the surface source through treatment and distribution, altering the balance between chromium(VI) and other forms. Testing results reflect chromium-6 measured after these processes, yet concentrations at an individual tap depend on plumbing and local conditions.

Detection levels do not establish individual water quality

Federal monitoring from 2013 to 2015 found chromium-6 consistently detected in Wailuku's surface water supply, with levels reported between 0.03 and 2.9 micrograms per liter (ppb). These detections indicate presence but are not safety violations and cannot substitute for a test of your own household water.

Geogenic Hexavalent Chromium in Arid and Alkaline Aquifers Versus Industrial Plating Sources

Wailuku’s chromium-6 largely stems from natural surface waters, not industrial sources

Hexavalent chromium can originate from geogenic sources, especially in alkaline or dry aquifers with mineral-rich soils, or from industrial plating operations. Wailuku's public water system uses surface water, and no industrial chromium-6 contamination is documented here. The consistent detection levels reflect natural contributions typical for similar Hawaiian surface sources.

The Order in Which to Rule Things Out, From Cheapest Check to Laboratory Test

Start by verifying public water system records and household plumbing condition

Because chromium-6 is detected in Wailuku’s system water, first check your most recent water quality report and whether your plumbing materials are known to affect chromium levels. Household plumbing can sometimes change water quality independently.

If concerns persist, send a sample for laboratory analysis

Only a laboratory test of your household water can establish exact chromium-6 concentration in your tap water, accounting for your plumbing and usage patterns. General area data are informative but cannot confirm your water’s specific chemistry.

The Household or Facility Symptoms That Do and Do Not Point to This Problem

Chromium-6 presence generally does not cause sensory or visible changes

Chromium(VI) at levels detected in Wailuku water is colorless and tasteless, so it typically does not cause noticeable odor, discoloration, or staining in household water. Symptoms like unusual taste or discoloration are unlikely indicators of chromium-6.

Water quality issues like staining or taste changes often relate to other causes

Issues such as metallic taste, staining, or scaling may have causes unrelated to chromium-6, such as iron, manganese, or hardness minerals. Testing is needed to identify these factors.

How the Constituent Enters Groundwater or the Distribution System in This Region

Surface water sources in Wailuku carry naturally occurring hexavalent chromium

Chromium-6 enters the Wailuku system primarily through surface water that interacts with soils and minerals from surrounding areas. These natural geologic factors contribute chromium(VI) at levels recorded in the EPA database.

Distribution system monitoring reflects variations in source water and treatment

The public water system samples multiple points, capturing how chromium-6 moves and changes from source to tap. These results provide an overview for the system serving over 74,000 residents but do not measure individual household conditions.

Addressing Your Water’s Chromium-6

If you have tested your household water and found levels of hexavalent chromium that you wish to reduce, a targeted treatment device designed for chromium-6, such as the Autotrol Chromium-6 Filter, ships ready to configure for residential use. This equipment is sized according to your daily water demand and helps address chromium(VI) specifically, complementing your water management approach.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-02-20. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Wailuku (HI0000212), HI: 174 results across 2 listed contaminants, 174 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L