Autotrol 1,4-Dioxane Filter

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Local Water Supply Overview in Modesto, Stanislaus County

The City of Modesto sources its public water primarily from surface water, serving over 218,000 residents through more than 70,000 connections. This system's water travels from collection points through treatment and distribution networks before reaching household taps. Understanding the composition of this water is essential for residents assessing their drinking water concerns.

Contributions to 1,4-Dioxane Presence: Landfill Leachate, Industrial Sites, and Consumer Products

1,4-Dioxane, also referred to as dioxane or the cyclic ether solvent stabilizer, can enter water supplies from several sources. Landfill leachate can carry trace amounts from disposed consumer and industrial waste. Degreasing operations and manufacturing sites historically used solvents containing cyclic ethers, contributing to local water detections. Additionally, some consumer products contain this solvent stabilizer, which may indirectly affect water quality through wastewater streams.

Why Low-Level Detection Reports Use Three Decimal Places

Government sampling records show 1,4-dioxane concentrations measured in micrograms per liter (µg/L) or parts per billion (ppb) with precision to three decimal places. This level of detail reflects the analytical methods' sensitivity, allowing identification of even minimal traces in the water. Such precision helps characterize background levels but does not imply regulatory limits or safety concerns since no health-based maximum contaminant level exists federally for 1,4-dioxane.

Sampling Size and Interpretation: What 112 Samples Tell Us

Data from 112 samples collected from the City of Modesto’s water system provide a snapshot of 1,4-dioxane occurrence. Eight detections were above the reporting threshold of 0.07 µg/L, with the highest measured at 0.17 µg/L. However, this sample size represents the system’s distributed water, not individual household plumbing or wells. Small detection counts indicate occasional presence rather than constant or elevated levels within the entire system.

Reading the Median and Range as a Homeowner

A median concentration among detected samples of 0.094 µg/L means that half of those detections measured above and half below this value. With a range topping at 0.17 µg/L and no federal maximum level, these figures suggest 1,4-dioxane exists in trace amounts within the system's treated water. Homeowners cannot assume their tap water has this level without specific testing but can recognize these values as typical system findings.

Differentiating 1,4-Dioxane from Other Common Water Concerns

Unlike many contaminants regulated with enforceable limits, 1,4-dioxane currently has no federal maximum contaminant level. Its chemical behavior as a stable cyclic ether solvent stabilizer distinguishes it from pollutants like chlorinated solvents or volatile organic compounds often confused with it. Understanding these differences helps in selecting appropriate treatment tailored specifically to this compound’s properties.

Summary of the Data Scope and Your Household Decision

The government record details 1,4-dioxane monitoring in the City of Modesto's public water system, serving much of Stanislaus County from surface water sources and does not reflect specific household water quality variations. Homeowners considering options to address possible 1,4-dioxane in their water supply should begin by testing their own tap water for this specific cyclic ether. For households seeking a documented treatment approach, the Autotrol 1,4-Dioxane Filter ships ready to configure and provides technology designed to reduce trace levels of this constituent effectively.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-06-11. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for City of Modesto (CA5010010), CA: 112 results across 1 listed contaminants, 8 detections above the reporting level; no federal MCL; EPA cancer risk reference concentration 0.35 ug/L