How Sulfide Enters Groundwater in Madison County's Aquifer 110QRNR
In Madison County, Illinois, the sulfur smell commonly noticed in household water originates from sulfide compounds dissolved in groundwater drawn from aquifer 110QRNR. Sulfide forms naturally where organic materials decompose in oxygen-poor underground environments. Certain bacteria reduce sulfate, producing hydrogen sulfide gas, which is responsible for the characteristic rotten-egg odor when water is exposed to air in faucets or plumbing.
Seasonal and Multi-Year Variation in Sulfide Levels
Water quality monitoring done by the U.S. Geological Survey from July 2011 through August 2013 sampled four wells in this aquifer. Results showed sulfide concentrations ranging from 0.001 to 0.015 milligrams per liter, with a median of 0.007 mg/L. These values reflect natural variation over time and location but remained below any federal health thresholds throughout the sampling period. This suggests that sulfide levels in the region fluctuate modestly but do not reach concentrations deemed harmful by regulatory standards.
Information to Record Before Seeking Treatment
If you are experiencing a sulfur smell in your household water, it is important to document details before selecting a treatment approach. Maintain records of:
- Dates when the odor is noticeable and any changes in intensity
- Locations within the home where the smell occurs most strongly
- Any recent changes in water source, plumbing, or filtration equipment
- Depth and type of your well or water source, if known
- Results from any professional water testing specific to your water supply
This information helps differentiate between regional sulfide presence and conditions unique to your water system.
Fixtures, Appliances, and Processes Most Affected by Sulfur Smell
The sulfur smell is usually first noticed at taps and fixtures where water is exposed to air, such as kitchen sinks, bathroom faucets, and showers. Water heaters may also concentrate the odor because heat accelerates the release of dissolved gases. Because the smell is a gas liberated from water, appliances relying on aeration or water storage can intensify its detectability. The odor does not indicate contamination of water used for drinking but can affect the sensory quality and experience.
Influence of Well Depth and Source on Expected Sulfide Levels
The sampled wells in Madison County’s aquifer varied between 24 and 102 feet deep. Sulfide concentrations in groundwater can change with well depth because different soil and rock layers influence oxygen availability and organic content. Shallower wells may show different sulfide levels compared to deeper wells due to variations in bacterial activity and water chemistry. Knowing your well depth and construction details can help anticipate the likelihood and severity of sulfur smell.
Maintenance Rhythm of the Autotrol Rotten-Egg Sulfur Smell Filter
The Autotrol Rotten-Egg Sulfur Smell Filter ships ready to configure and offers a documented method to reduce sulfide-related odors. This filtration system typically requires periodic media replacement or regeneration based on water usage and sulfide concentrations, which should be tracked following the product guidelines. Regular maintenance ensures the filter continues to effectively minimize sulfur odors in household water.
What Not to Conclude from Area Sulfide Data
Area-level sulfide measurements reflect general groundwater conditions but do not specify your water supply’s sulfide concentration. Detection in regional samples is not a violation or indication of unsafe water. Similarly, the presence of sulfide does not imply health risk, as the federal thresholds were not exceeded in monitored wells. To understand your well or household water quality accurately, obtain a professional water test specific to your plumbing system and water source.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2013-08-21. These figures describe groundwater sampled in this area. They are not a test of any individual private well - only a test of that well can establish its own water.
On record: U.S. Geological Survey sampling of Sulfide in the 110QRNR aquifer (Madison County): 4 results from 4 wells, median 0.007 mg/L, range 0.001-0.015 mg/L; none above any federal threshold
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