Sampling Scope and Its Implications
The Bangor Water District serves a diverse area including Bangor, Clifton, Eddington, Hampden, Hermon, Orrington, Veazie, and other parts of Penobscot County with surface water as its source. Records show monitoring was done under the EPA's Unregulated Contaminant Monitoring Rule (UCMR1) between 2002 and 2003. Four samples were tested for perchlorate, none with detections above a reporting threshold of 4.0 micrograms per liter. Though the sample size is limited, this data represents the public water system level and not any individual residence.
Because the monitoring involved a small number of samples from the main system, it provides an overview but not specific details about individual household water quality. Homeowners considering their perchlorate risk should seek direct testing of their supply to understand their unique situation.
Interpreting Median and Range: An Example for Homeowners
In this water system’s perchlorate record, the median and range cannot be calculated since no detections exceeded the reporting level. For a homeowner, this means the consistent absence of perchlorate detections in public monitoring samples, but it does not establish that no perchlorate is present in any particular home. The median refers to the middle value when all results are arranged numerically, and range indicates the span between the lowest and highest detected levels. Since all samples were non-detects, the inferred median and range are effectively below the reporting limit.
Symptoms That May Relate to Perchlorate – and Those That Do Not
Perchlorate, a chemical sometimes resulting from industrial or military use, can interfere with thyroid function by affecting iodine uptake. However, it does not cause common water issues such as taste anomalies, staining, or typical household plumbing corrosion. If your household experiences these latter symptoms, perchlorate is unlikely to be the cause.
Health symptoms related to perchlorate exposure involve thyroid-related conditions, but these are generally linked to long-term ingestion at significant levels, which is not established for your area’s water system given the monitoring results. Routine water-use symptoms like cloudiness or odor do not indicate perchlorate presence.
Additional Considerations for Commercial or Industrial Operators
Businesses or facilities with larger or variable water demand may need more comprehensive testing and monitoring of perchlorate levels to meet regulatory or operational standards. Unlike typical residential concerns, their water usage patterns and supply points might require periodic verification beyond what the public water system monitoring covers. For residential households, such extensive measures are typically not necessary but can inform treatment needs in complex cases.
Understanding Terminology in the Monitoring Record
Terms like “detected,” “median,” and “range” have specific meanings in these reports. “Detected” means a measurement instrument found perchlorate present at some level, not that it exceeds a limit or poses a health risk. Because no federal Maximum Contaminant Level (MCL) currently exists for perchlorate, detections are observations rather than violations. The median and range help describe the data spread but are not available here due to non-detects.
Information to Document Before Seeking Water Treatment Advice
Before exploring treatment options, record the following details about your water situation:
- Source of your water (municipal surface water or private well)
- Any recent water quality testing results, especially perchlorate-specific if available
- Symptoms or household concerns related to water use
- Water usage volume and patterns
- The age and condition of your household plumbing
This information helps clarify your perchlorate exposure risk and treatment needs.
Final Note on Treatment Options for Perchlorate
For households in Penobscot County seeking a targeted approach to perchlorate, the C-Series Perchlorate Filter ships ready to configure and addresses perchlorate reduction based on your specific demand volume. This documented technology offers a practical solution once your water testing clarifies your perchlorate levels and treatment requirements.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2003-04-16. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA UCMR1 monitoring (2001-2005) for BANGOR WATER DISTRICT (ME0090110), ME: 4 results across 1 listed contaminants, 0 detections above the reporting level; nothing detected above the method reporting level