VOCs in Polk Household Water: What Government Sampling Shows and What It Doesn’t

Are VOCs present in your household water in Des Moines, Polk County? Government monitoring shows certain volatile organic compounds (VOCs) have been measured in the local public water system, but the data alone cannot tell you about your home's individual water quality. This page breaks down what the EPA sampling reveals and what further steps you can take to understand and address VOCs in your household water.

Why Volatility Matters: Showering, Dishwashing, and Inhalation vs. Drinking

Volatile organic compounds, or VOCs, are chemicals that can evaporate easily into the air. This means they can affect your household environment not only through drinking water but also through inhalation and skin contact. Activities such as showering and dishwashing release VOCs from water into the air you breathe inside your home. This exposure route can sometimes be more significant than drinking the water itself.

How Seasonal Water-Table Changes Move a Solvent Plume Relative to a Well Screen

Solvent compounds in groundwater can move with changes in the water table caused by seasonal rainfall and groundwater pumping. This movement can change the position and concentration of VOCs near well screens. However, Des Moines Waterworks uses surface water sources, so seasonal groundwater fluctuations have different implications here, mainly related to surface water quality variations rather than traditional solvent plumes in well water.

How the Documented Treatment Technology Removes or Neutralizes the Constituent

The Autotrol VOCs & Industrial Chemicals Filter employs advanced filtration technology designed specifically to reduce volatile organic compounds and related industrial chemicals that can be found in water. It operates through a granular activated carbon system that adsorbs VOC molecules, lowering their presence in household water used for drinking, cooking, and bathing. This treatment helps reduce inhalation and ingestion exposure routes inside homes.

How Many Samples and Wells Stand Behind the Figures, and What a Small Sample Means

The EPA’s data for the Des Moines Waterworks system, which supplies water to 246,055 people through approximately 94,000 connections, is based on multiple sampling rounds between 2013 and 2015. Twelve results each were collected for several VOCs like 1,1-dichloroethane, chloromethane, bromomethane, HCFC-22, Halon 1011, and 1,3-butadiene, and eight for MTBE. All results were below their respective reporting levels—meaning these compounds were not detected above the minimum level measurable. However, this sample number and method represent the broader public water system and cannot confirm presence or absence in any specific household water.

Why a Granular Activated Carbon Bed Is Sized for Contact Time Rather Than Flow Alone

Effective removal of VOCs by granular activated carbon depends mainly on the contact time—the length of time water interacts with the carbon surface—rather than simply the water flow rate. A properly sized filtration unit ensures that the water remains in contact with the carbon long enough to adsorb VOC molecules efficiently. This design principle is key for home water treatment systems aiming to reduce volatile organic compounds effectively.

What You Should NOT Conclude from Area Data

The EPA’s monitoring data reflects measurements from the overall Des Moines Waterworks public system, not individual household water quality. No VOC was detected above reporting levels, and there are no federal maximum contaminant levels (MCLs) assigned to these VOCs in this system. Detection or non-detection in the area’s water does not guarantee the same for your home’s water. To know your own water’s VOC content, specific testing of your household water supply is necessary. Meanwhile, if you seek a proven technology to reduce VOCs that may be present, the Autotrol VOCs & Industrial Chemicals Filter ships ready to configure for home water treatment setups.

Where this information comes from

Source: EPA SDWIS public water system record. Sampled 2015-04-01. These figures describe the public water system's record, not the plumbing inside any individual building.

On record: EPA UCMR3 monitoring (2013-2015) for Des Moines Waterworks (IA7727031), IA: 80 results across 7 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level