Public water system · MD0100041
ActiveKnolls of Windsor
At a glance
Knolls of Windsor (PWSID MD0100041) is an active community water system in Frederick County, Maryland. It reports serving 1,553 people through 1,062 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as owned by a local government. EPA's Safe Drinking Water Act records list no violations for this system.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,553
Service connections
1,062
Primary source
GU
Groundwater under influence of surface water
System type
CWS
Community water system
System record
How does Knolls of Windsor compare with other water systems in Frederick County?
By EPA's size categories, Knolls of Windsor is a small system (501 to 3,300 people). Frederick County has 211 active public water systems. Its population served is about 54% above the county average of 1,007 people per system, and accounts for 0.7% of the 212,367 people reported by systems filed under the county. Across Maryland, the 2,992 active systems average 1,947 people each. Nationally, the average active community water system reports serving 6,703 people, so Knolls of Windsor is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Maryland has 422 active community water systems, 14% of the state's 2,992 active systems. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 29 Maryland systems (1%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Knolls of Windsor?
EPA lists Knolls of Windsor as owned by a local government. The MD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 41 of the 211 active systems in Frederick County (19%) are also owned by a local government.
Does Knolls of Windsor have drinking water violations?
No SDWA violations on record.
EPA's SDWA violation and enforcement data (via EPA ECHO, updated quarterly) lists no violations for Knolls of Windsor. For the latest compliance status, check EPA ECHO for current compliance history.
Knolls of Windsor: frequently asked questions
Who runs Knolls of Windsor?
Knolls of Windsor (PWSID MD0100041) is a community water system owned by a local government. It is regulated by the MD state drinking water program.
How many people does Knolls of Windsor serve?
Knolls of Windsor reports serving 1,553 people through 1,062 service connections in Frederick County, Maryland.
Where does Knolls of Windsor get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Knolls of Windsor have any drinking water violations?
EPA's Safe Drinking Water Act records list no violations for this system.
Is Knolls of Windsor's water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's Safe Drinking Water Act records list no violations for this system. For current results, consult the system's annual water quality report, EPA ECHO, or the MD state drinking water program.
Where can I find Knolls of Windsor's water quality report?
As a community water system, Knolls of Windsor must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Frederick County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| New Design - Frederick County | Frederick | 74,911 | Community | Surface water |
| City of Frederick | Frederick | 54,000 | Community | Surface water |
| Town of Walkersville | Frederick | 8,440 | Community | Groundwater under influence of surface water |
| Fort Detrick | Frederick | 7,900 | Community | Surface water |
| City of Brunswick | Frederick | 7,312 | Community | Surface water |
| Town of Thurmont | Frederick | 6,200 | Community | Groundwater under influence of surface water |
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About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Knolls of Windsor, PWSID MD0100041, Maryland”, https://aquacensus.com/water-systems/maryland/knolls-of-windsor-md0100041 (data as of October 1, 2026).