Government Sampling Data Coverage and Limitations
Number of Wells and Samples
Regional data for sulfide in Madison County's aquifer 337FRPN comes from 12 sampling results collected from 2 wells between mid-2010 and mid-2024. These wells were about 35 to 50 feet deep.
Sample Size and Representativeness
A total of 12 results from only 2 wells is a limited dataset. While it shows sulfide is commonly detected in the area aquifer, the small sample size means these figures serve strictly as a regional reference, not a direct measure of your household water.
Additional Considerations for Non-Residential Water Usage
Industrial or Commercial Requirements
Unlike a household, commercial or industrial sites often have higher water demand and need to meet specific regulatory limits or operational standards. They may require more frequent or specialized testing beyond basic sulfide detection.
Household-Specific Needs
For residential settings, the main focus tends to be on odor nuisance management and maintaining acceptable water aesthetics rather than broad regulatory compliance or process impacts.
Stepwise Approach to Diagnosing Sulfur Smell
Check for Plumbing-Related Causes First
Sometimes odors come not from source water but from plumbing system issues such as bacterial buildup or water stagnation. Replace or flush fixtures and run water lines to see if the smell decreases before investing in lab tests.
Conduct Basic Home Water Checks
Observe if the sulfur smell is isolated to hot water or cold water taps, whether it appears constantly or intermittently, and any changes after recent plumbing work or water outage.
Order Laboratory Testing to Confirm Sulfide Presence
If odor persists and household clues suggest source water sulfide, arrange water testing for sulfide levels to verify if your own water contains sulfur compounds.
Interpreting the Median and Range in Regional Sulfide Data
Median Sulfide Level of 0.025 mg/L
The median value from sampled Madison County wells is 0.025 mg/L sulfide. This means half of the readings were below this and half were above within the recorded range.
Variability and Maximum Detected Level
The highest detected sulfide concentration was 0.27 mg/L in the regional samples. All measurements were below federal health thresholds, confirming no regulatory exceedances in this dataset.
Implications for Homeowners
These measurements confirm sulfide is naturally present in the aquifer but do not determine whether your household water contains sulfide or at what concentration. Testing your own water is necessary for accurate assessment.
Influence of Plumbing Materials and System Age
Plumbing Materials Do Not Affect Source Sulfide Levels
The regional sulfide data relate to source aquifer water only and do not account for changes caused by plumbing materials or aging pipes within a home.
Potential for Odor Generation Within Plumbing
Older or corroded plumbing, or specific pipe materials, may harbor bacteria that produce sulfur odors independently from the well source water. This factor should be investigated when diagnosing household sulfur smell.
Final Step: Confirm Your Water’s Sulfide Level with a Laboratory Test
The definitive way to settle whether sulfur smell in your home arises from source water sulfide is by ordering a water test focused on sulfide concentration. A single, precise measurement will guide treatment decisions.
If sulfide is detected at levels causing odor nuisance, the C-Series Rotten-Egg Sulfur Smell Filter ships ready to configure and can reduce sulfur odor effectively when properly selected for household use.
Where this information comes from
Source: USGS groundwater sampling. Sampled 2024-08-21. 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 337FRPN aquifer (Madison County): 12 results from 2 wells, median 0.025 mg/L, range 0.0-0.27 mg/L; none above any federal threshold