Montgomery County, Maryland, receives its public water supply primarily from surface water sources managed under the City of Rockville system (PWSID MD0150003). This system serves about 52,000 residents through 17,500 connections. It employs various treatment processes to ensure water quality, including disinfectants such as chloramine, a chemical used widely to maintain water safety in distribution.
Myth: 'Detected' Means a Fixed Level in Your Home Water
Government water quality records use terms like 'detected,' 'median,' and 'range' to summarize sampling data. 'Detected' indicates that instruments found chloramine within the system's water at some point(s), but it does not specify a constant or individual home concentration. The 'median' reflects the middle value among samples, and 'range' shows the lowest and highest values observed. These statistics describe the system's water broadly; only a specific water test at your residence can confirm your home's actual chloramine concentration.
Myth: All Samples Are Alike Regardless of Source or Depth
The water system in Montgomery County relies on surface water sources, which means chloramine levels and related qualities can vary by treatment stage and distribution. Sample depth or source type affects detected levels, so measurements may differ depending on where and when samples are collected within the system. Homeowners should understand their home's place within this system when considering treatment options.
Myth: Few Samples Give a Full Picture
The City of Rockville system's chloramine figures are based on numerous samples collected throughout the network, though exact sample counts are not detailed here. Sampling frequency and volume influence the reliability of reported median and range values. A small number of samples would mean less certainty about typical chloramine levels. Larger, consistent sampling better represents overall water quality trends, aiding homeowners in making informed decisions.
Myth: Median and Range Values Describe Your Home Water Exactly
For example, the public records report a range of chloramine presence reflecting system-wide variability. This range does not predict your individual tap water; it only frames what has been measured across different locations and times in the system. To determine the chloramine level at your home, testing your tap water is necessary.
Myth: Treated Water with Chloramine Is the Same Before and After Home Filtering
The C-Series Chloramine (City Water) Filter ships ready to configure for residential use and offers a targeted approach to reducing chloramine at the tap. This technology is designed specifically for municipal water with chloramine presence, adapting to the variations documented in Montgomery County's water system. Utilizing this filter can change the water's chemical profile as it reaches household fixtures.
Myth: All Fixtures Are Affected Equally by Chloramine
When using a treatment like the C-Series system, certain household components such as drinking water outlets, ice makers, and appliances sensitive to disinfectants often experience the most noticeable changes first. These points benefit directly from reduced chloramine levels, which can impact taste, odor, and material interaction differently across devices and usage types.
The City of Rockville water system record reflects broad sampling over time in Montgomery County, showing no health-based violations related to chloramine. Understanding the meaning of these data and how the C-Series Chloramine (City Water) Filter operates can help homeowners weigh two technical approaches to managing chloramine. For more details, consult the EPA's official public water system record for MD0150003.
Where this information comes from
Source: EPA SDWIS public water system record. Sampled 2018-06-30. These figures describe the public water system's record, not the plumbing inside any individual building.
On record: EPA SDWIS record for CITY OF ROCKVILLE (MD0150003), surface water supply, serving 52000 people: 0 health-based violations of 20 total; lead 90th percentile 0 mg/L