The water serving households in Des Moines, Polk County, Iowa comes primarily from surface water sources managed by Des Moines Waterworks. This public water system delivers water to roughly 246,055 people through about 94,000 connections. Understanding the quality of this water, including trace-level detections of chemical constituents like 1,4-dioxane, helps guide residential treatment choices.
Why is 1,4-dioxane reported with such precise decimal points in Polk County water data?
The detected concentrations of 1,4-dioxane in the Des Moines Waterworks public system are recorded to three decimal places to reflect the sensitivity and precision of the laboratory instruments used. A reporting level of 0.07 micrograms per liter (µg/L) — or parts per billion — is the threshold above which a detection is noted. This decimal precision helps distinguish very low-level trace presence from non-detects, but it does not imply a violation or unsafe condition at these levels.
What do 'detected,' 'median,' and 'range' mean in 1,4-dioxane measurements here?
- 'Detected' means the laboratory instruments measured a concentration at or above 0.07 µg/L during sampling.
- The 'median' is the middle value in a set of measurements, used to summarize central tendency but not provided for 1,4-dioxane in this record since all results were below detection.
- 'Range' indicates the span between lowest and highest measured concentrations across samples, with all 12 samples showing non-detects for 1,4-dioxane.
These terms describe occurrence in the public water system broadly and do not specify conditions in any individual home’s water.
How do landfill leachate, degreasing sites, and consumer products influence 1,4-dioxane in this region?
1,4-dioxane, the cyclic ether sometimes called a solvent stabiliser, can enter water sources from industrial degreasing operations, landfill leachate, and the breakdown of certain consumer products with this chemical. In Polk County, surface water supplies might be affected by runoff or seepage carrying trace amounts of dioxane from these sources. Although detected levels in Des Moines Waterworks samples are below reporting limits, these potential contributors underline the importance of monitoring.
What can occur if low levels of 1,4-dioxane remain untreated over many years?
1,4-dioxane is persistent and highly soluble, allowing it to travel with water without easily breaking down. Over time, untreated dioxane may accumulate to levels detectable by sensitive instruments. It does not typically cause immediate aesthetic issues but is closely watched due to its classification as a probable human carcinogen by EPA. Long-term exposure assessments are done based on water use, concentration, and regulatory guidance rather than immediate health risk alarms at detected trace levels.
How does 1,4-dioxane enter groundwater or the distribution system in Des Moines, IA?
In this region, the solvent stabiliser enters surface water primarily through industrial and commercial activities releasing it into rivers or reservoirs. Since Des Moines Waterworks relies on surface water, these trace amounts can pass into the municipal system's intake. Groundwater contamination pathways exist chiefly near industrial sites, but the record here is from a surface water system, so distribution system contamination reflects source water quality rather than infiltration from underground aquifers.
What information should you note before seeking advice on 1,4-dioxane treatment?
- Obtain a current water test specific to your residence to determine your actual 1,4-dioxane concentration, as system averages do not reflect individual conditions.
- Document any water quality reports or notices provided by Des Moines Waterworks.
- Note any household water uses that may concentrate or expose you more to water constituents.
- Understand that treatment needs vary according to detected levels and usage patterns.
Having this information ready supports choosing the appropriate class of treatment.
Summary of the Des Moines Waterworks 1,4-dioxane Record and Next Steps
The federal occurrence monitoring data for the Des Moines Waterworks system serving Polk County residents shows no detections of 1,4-dioxane above the reporting level of 0.07 micrograms per liter in the samples taken between 2014 and 2015. This indicates very low or undetectable levels in the public surface water supply rather than individual home water quality. For residents evaluating treatment options, a specific test of your own water is essential. The Autotrol 1,4-Dioxane Filter ships ready to configure and is designed to address solvent stabilisers like dioxane effectively when present at concerning levels.
For detailed federal water system occurrence data, refer directly to the EPA Safe Drinking Water Information System records.
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: 12 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level
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