Public water system · MD0100015
ActiveCity of Frederick
At a glance
City of Frederick (PWSID MD0100015) is an active community water system in Frederick County, Maryland. It reports serving 54,000 people through 16,600 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in July 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
54,000
Service connections
16,600
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does City of Frederick compare with other water systems in Frederick County?
By EPA's size categories, City of Frederick is a large system (10,001 to 100,000 people). Frederick County has 211 active public water systems, and City of Frederick is the 2nd-largest of them by population served. Its population served is about 54 times the county average of 1,007 people per system, and accounts for 25% 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 City of Frederick is about 8.1 times 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. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 31 Maryland systems (1%) list surface water as their primary source.
Who owns and regulates City of Frederick?
EPA lists City of Frederick 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 City of Frederick have drinking water violations?
EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in July 2013. The violations listed here began between April 2008 and July 2013. By type: 1 contaminant level above the legal limit, 1 required treatment not met, 1 public notice, recordkeeping or other and 1 monitoring and reporting. The contaminants or rules involved are Haloacetic acids (HAA5), Long Term 2 Enhanced Surface Water Treatment Rule, Consumer Confidence Rule and Cryptosporidium. EPA lists 4 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2013-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Haloacetic acids (HAA5)code 2456 | Yes | Resolved |
| 2009-10-01 | Required treatment not metFailure Submit Treatment Requirement Rpt · code 33 | Long Term 2 Enhanced Surface Water Treatment Rulecode 0800 | Yes | Resolved |
| 2008-07-01 | Public notice, recordkeeping or otherConsumer Confidence Report Complete Failure to Report · code 71 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2008-04-01 | Monitoring and reportingMonitoring, Source Water (LT2) · code 32 | Cryptosporidiumcode 3015 | No | Resolved |
All 4 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
City of Frederick: frequently asked questions
Who runs City of Frederick?
City of Frederick (PWSID MD0100015) is a community water system owned by a local government. It is regulated by the MD state drinking water program.
How many people does City of Frederick serve?
City of Frederick reports serving 54,000 people through 16,600 service connections in Frederick County, Maryland.
Where does City of Frederick get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does City of Frederick have any drinking water violations?
EPA's records list 4 violations for this system; 2 are health-based, and the most recent began in July 2013. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is City of Frederick'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 records list 4 violations for this system; 2 are health-based, and the most recent began in July 2013. For current results, consult the system's annual water quality report, EPA ECHO, or the MD state drinking water program.
Where can I find City of Frederick's water quality report?
As a community water system, City of Frederick 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 |
| 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 |
| Town of Middletown | Frederick | 4,288 | Community | Groundwater |
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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, “City of Frederick, PWSID MD0100015, Maryland”, https://aquacensus.com/water-systems/maryland/city-of-frederick-md0100015 (data as of October 1, 2026).