Sulfur Smell in Cumberland County Water: What Bedrock Aquifer Data Shows

Government sampling by the U.S. Geological Survey from October 2011 recorded sulfide in bedrock aquifer wells in Cumberland County, Maine, with a median of 0.0 mg/L and a range from 0.0 to 0.01 mg/L across three wells sampled between 265 and 680 feet deep.

Reading the Area Sulfide Data as a Homeowner

Median Indicates Half the Wells Had No Detected Sulfide

The median sulfide value of zero means that at least half of these sampled wells in the area showed no measurable sulfide at the time of testing.

Range Shows Some Wells Had Minimal Sulfide Detected

The detected sulfide concentrations ranged up to 0.01 mg/L, which is very low and well below any federal threshold for health effects.

Samples Reflect Area Conditions, Not Your Well Specifically

These results apply to this region's bedrock aquifer wells sampled by USGS, not directly to your household water. Your water must be individually tested to confirm its sulfide level.

How Plumbing Materials and Age Affect Sulfur Smell

Older Pipes Can Influence Water Taste and Odor

Corrosion or biofilm inside older plumbing can contribute to or intensify sulfur-like odors, independent of source water sulfide levels.

Pipe Material May React With Water Chemistry

Certain materials interact with sulfur compounds or bacteria, which may enhance the rotten-egg smell regardless of aquifer conditions.

Interpreting 'Detected', 'Median', and 'Range' in the USGS Sampling

Detected Means Sulfide Was Measured Above Reporting Limit

All three samples had sulfide detected, meaning instruments found it at a measurable level, but these levels are minimal and do not imply health risks.

Median Reflects the Middle Value of All Samples

A median of zero shows that multiple wells had no sulfide detected, balancing the low-level detections in others.

Range Covers Lowest to Highest Detected Values

The range from 0.0 to 0.01 mg/L captures the variability in the samples but remains far below any safety or aesthetic thresholds.

Commercial or Industrial User Questions Beyond Household Concerns

Volume and Flow Rates May Affect Odor Control Strategies

Large-scale users often need to consider how water system design impacts sulfur smell treatment and management.

Additional Testing Parameters Often Required

Businesses may need more comprehensive water chemistry analysis to meet regulatory or process needs beyond simple aesthetic concerns.

What the Detected Sulfide Range Means Against Federal Standards—and What It Does Not

All Measured Results Are Below Health-Based Federal Limits

None of the sulfide levels from the sampled wells exceed federal thresholds, indicating no health violation documented in this record.

Low-Level Detection Is Not a Safety Concern

Detecting sulfide at these low concentrations mainly relates to odor or taste, not toxicity or health risk.

Exceeding Aesthetic Guidelines Is Not a Health Violation

Federal secondary standards address water appearance and odor but are not enforceable health limits.

Sample Size and Well Depths Behind These Sulfide Readings

Three Wells Sampled Offer Limited Regional Insight

While three samples provide some area context, more sampling could better define sulfide variability in the aquifer.

Depths From 265 to 680 Feet Reflect Bedrock Aquifer Conditions

The data represent relatively deep groundwater typical of bedrock wells in Cumberland County, not shallow or surface water sources.

If your household water has a persistent sulfur smell, testing your own well water for sulfide concentration remains necessary. To address this issue, the Autotrol Rotten-Egg Sulfur Smell Filter ships ready to configure and is designed to reduce sulfur odors effectively based on your measured demand.

Where this information comes from

Source: USGS groundwater sampling. Sampled 2011-10-26. 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 BEDROCK aquifer (Cumberland County): 3 results from 3 wells, median 0.0 mg/L, range 0.0-0.01 mg/L; none above any federal threshold