What 'Detected', 'Median', and 'Range' Mean in the Sampling Record for Chlorine
Government sampling data from the Portland Water District-Greater system, which serves over 135,000 people across Cumberland County towns including Cape Elizabeth, Portland, and South Portland, records chlorine as a routinely monitored constituent. When a report states chlorine is 'detected,' it means a laboratory measurement showed the presence of chlorine compounds at a quantifiable level. The 'median' represents the middle value of all measurements taken during the specified period, providing a central tendency of chlorine levels found in the water supply. The 'range' indicates the lowest to highest measurements recorded, showing variability over time or location within the system. These terms describe the system-wide findings, not conditions in any specific household's water.
Adjusting Considerations for Large Households, Second Homes, or Seasonal Properties
Households with larger water use or those located in seasonal residences may experience different practical factors in maintaining water quality related to chlorine.
- Large households might need to evaluate higher water flow impact on filter media capacity to ensure continued effectiveness.
- Second or seasonal homes may face variable chlorine levels if water sits in pipes for extended periods, altering taste or smell.
- Monitoring and maintenance rhythms for treatment equipment could differ based on usage patterns, influencing the choice of treatment approach.
What a Certified Laboratory Test for Chlorine Reports and How to Read It
A laboratory test specific to a home's water supply typically measures the concentration of free chlorine and chloramines, the disinfectant residuals maintained in distribution systems like Portland Water District-Greater. The test report lists these concentrations in milligrams per liter (mg/L) or parts per million (ppm). Results below established secondary standards address aesthetic factors such as taste and odor rather than safety violations. Understanding your own water report requires noting these levels and consulting local sampling records for context, as individual household plumbing and usage may affect chlorine presence.
How the Fleck Chlorine Taste & Smell Filter Removes or Neutralizes Chlorine
The Fleck Chlorine Taste & Smell Filter provides an effective method to reduce chlorine compounds responsible for noticeable taste and smell in residential water. Its filtration system uses catalytic media designed to adsorb and neutralize chlorine residuals from treated surface water sourced by the Portland Water District-Greater system. The filter ships ready to configure and is suitable for various household sizes and usage patterns. By targeting the chlorine molecule specifically, it enhances water quality without altering other water characteristics.
How Chlorine Enters Groundwater or the Distribution System in Cumberland County
In Cumberland County, the primary water supply is surface water treated and distributed by the Portland Water District-Greater system. Chlorine is introduced intentionally during water treatment as a disinfectant to control microbial presence and ensure public health. It persists in the distribution network as a residual to maintain microbial control but can cause taste or odor detectable at the tap. Unlike groundwater systems, where chlorine might enter through treatment or contamination, here it reflects controlled treatment practices managing safety and quality.
What You Should NOT Conclude from Area Chlorine Data
Area-wide sampling results from the Portland Water District-Greater system do not define the chlorine concentration in any individual home’s water. A detected level only confirms laboratory observation and is not a violation or an indication of unsafe water. Secondary standards related to chlorine address taste and odor, not health risks, and no health-based violations have been recorded for this system. To understand chlorine impact on your household water, an individual certified test is essential before deciding on treatment methods.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2023-12-31. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for PORTLAND WATER DISTRICT-GREATER (ME0091300), surface water supply, serving 135068 people: 0 health-based violations of 6 total; lead 90th percentile 0.0019 mg/L
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