Autotrol Chromium-6 Filter

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1. Trivalent Versus Hexavalent Chromium: Why a Total-Chromium Result Cannot Answer the Question

When evaluating chromium in drinking water, it's important to distinguish between chromium's two main oxidation states: trivalent chromium (Cr(III)) and hexavalent chromium (Cr(VI), also called chromium-6). Total chromium measurements include both forms but do not specify their proportions. Since chromium-6 can have different chemical behaviors and health considerations than chromium(III), knowing total chromium alone does not clarify the chromium-6 situation. Tulare County's water system measurements report both chromium and chromium-6 separately, acknowledging this distinction in the data.

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

The oxidation state of chromium in water may shift as water moves from the groundwater source through treatment facilities and distribution mains to the tap. Factors such as exposure to oxygen, pH, and other compounds can affect chromium's form. For Tulare County's CA Water Service – Visalia system, groundwater is the source, and chromium-6 was detected consistently in monitoring from 2013 through 2015. However, individual household tap water chromium-6 levels can vary due to local plumbing and water chemistry changes. This means a detection in the system's record does not precisely define what a single household receives.

3. What the Reader Should Write Down Before Asking Anyone for Treatment Advice

Before seeking treatment options, households should note specific information:

• The water source (in this case, groundwater served by the local public system)
• Any prior water quality tests available from a recent tap water sample
• Any particular water quality concerns or physical signs (taste, staining, or others)
• The system's monitoring data: for Tulare County's CA Water Service – Visalia, chromium-6 was detected in 120 sampling results, with a median of 0.73 micrograms per liter (or parts per billion) and a highest measured concentration of 2.7 micrograms per liter

Having this information ready improves clarity in discussions about water treatment.

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

Chromium-6 in groundwater can arise from natural geologic sources or industrial activities. In Tulare County's groundwater, the chromium-6 presence is typically linked to geogenic conditions common in arid, alkaline aquifers rather than industrial contamination. This natural origin implies differing treatment considerations compared to chromium-6 from industrial plating waste. Understanding this distinction helps in determining appropriate water management and treatment approaches for households relying on this water.

5. What 'Detected', 'Median' and 'Range' Mean in the Sampling Record on This Page

The term 'detected' simply indicates the presence of chromium-6 above the method's reporting level, which is 0.03 micrograms per liter for this system's measurements; it is not a health violation or indication of unsafe water. The 'median' value of 0.73 micrograms per liter represents the middle point among detected values, showing a typical level found in the monitoring period. The 'range' from the lowest detectable level to the highest measured 2.7 micrograms per liter provides context on variability in the system's water over time. These statistics describe system-wide findings, not one household's water.

Closing this review, the single most informative action a household can take is to have a water sample analyzed specifically for chromium-6 at a certified laboratory. This targeted test will yield a definitive chromium-6 concentration for the household's tap water. If chromium-6 is present at levels of concern to the resident, the Autotrol Chromium-6 Filter ships ready to configure as a documented option to address hexavalent chromium in residential water supplies. This technology is designed to work with chromium-6 in household water to provide an additional layer of treatment when desired.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2016-01-12. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for CA Water Service - Visalia (CA5410016), CA: 240 results across 2 listed contaminants, 238 detections above the reporting level; no federal MCL for hexavalent chromium; total chromium MCL 100 ug/L