Public water system · MD1181062
ActiveCallaway Shell
At a glance
Callaway Shell (PWSID MD1181062) is an active transient non-community water system in St. Mary's County, Maryland. It reports serving 59 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 2 violations for this system; all are health-based, and the most recent began in April 1992.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
59
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Callaway Shell compare with other water systems in St. Mary's County?
By EPA's size categories, Callaway Shell is a very small system (500 people or fewer). St. Mary's County has 194 active public water systems. Its population served is well below the county average of 642 people per system, and accounts for less than 0.1% of the 124,635 people reported by systems filed under the county. Across Maryland, the 2,992 active systems average 1,947 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Callaway Shell is about 59% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. Maryland has 2,079 active transient non-community water systems, 69% of the state's 2,992 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,870 Maryland systems (96%) list groundwater as their primary source.
Who owns and regulates Callaway Shell?
EPA lists Callaway Shell as privately owned. 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. 137 of the 194 active systems in St. Mary's County (71%) are also privately owned.
Does Callaway Shell have drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in April 1992. The violations listed here began between January 1992 and April 1992. By type: 2 contaminant level above the legal limit. The contaminant or rule involved most often is Total coliform bacteria (TCR) (2 of them). EPA lists 2 as archived. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 1992-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
| 1992-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Archived |
All 2 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.
Callaway Shell: frequently asked questions
Who runs Callaway Shell?
Callaway Shell (PWSID MD1181062) is a transient non-community water system privately owned. It is regulated by the MD state drinking water program.
How many people does Callaway Shell serve?
Callaway Shell reports serving 59 people through 1 service connection in St. Mary's County, Maryland.
Where does Callaway Shell get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Callaway Shell have any drinking water violations?
EPA's records list 2 violations for this system; all are health-based, and the most recent began in April 1992. 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 Callaway Shell'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 2 violations for this system; all are health-based, and the most recent began in April 1992. For current results, consult EPA ECHO, or the MD state drinking water program.
Where can I find Callaway Shell's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Callaway Shell is a transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in St. Mary's County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Lexington Park | St. Mary's | 43,030 | Community | Groundwater |
| Patuxent Naval Air Station (Navfac-Wash) | St. Mary's | 22,000 | Community | Groundwater |
| Town of Leonardtown | St. Mary's | 5,000 | Community | Groundwater |
| Country Lakes | St. Mary's | 3,016 | Community | Groundwater |
| Cedar Cove | St. Mary's | 2,728 | Community | Groundwater |
| Saint Marys College | St. Mary's | 2,200 | 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, “Callaway Shell, PWSID MD1181062, Maryland”, https://aquacensus.com/water-systems/maryland/callaway-shell-md1181062 (data as of October 1, 2026).