Public water system · MD1101302
ActiveShell Oil Co(Mt. Airy Shell)
At a glance
Shell Oil Co(Mt. Airy Shell) (PWSID MD1101302) is an active transient non-community water system in Frederick County, Maryland. It reports serving 152 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 7 violations for this system; all are health-based, and the most recent began in November 2013.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
152
Service connections
1
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Shell Oil Co(Mt. Airy Shell) compare with other water systems in Frederick County?
By EPA's size categories, Shell Oil Co(Mt. Airy Shell) is a very small system (500 people or fewer). Frederick County has 211 active public water systems. Its population served is well below the county average of 1,007 people per system, and accounts for less than 0.1% 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 transient non-community water system reports serving 144 people, so Shell Oil Co(Mt. Airy Shell) is roughly in line with 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 Shell Oil Co(Mt. Airy Shell)?
EPA lists Shell Oil Co(Mt. Airy 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. 156 of the 211 active systems in Frederick County (74%) are also privately owned.
Does Shell Oil Co(Mt. Airy Shell) have drinking water violations?
EPA's records list 7 violations for this system; all are health-based, and the most recent began in November 2013. The violations listed here began between July 1999 and November 2013. By type: 7 contaminant level above the legal limit. The contaminant or rule involved most often is Nitrate (4 of them). EPA lists 7 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 |
|---|---|---|---|---|
| 2013-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2011-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2010-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2010-03-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Nitratecode 1040 | Yes | Resolved |
| 2010-02-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 2000-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Average · code 02 | Nitratecode 1040 | Yes | Resolved |
| 1999-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
All 7 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.
Shell Oil Co(Mt. Airy Shell): frequently asked questions
Who runs Shell Oil Co(Mt. Airy Shell)?
Shell Oil Co(Mt. Airy Shell) (PWSID MD1101302) is a transient non-community water system privately owned. It is regulated by the MD state drinking water program.
How many people does Shell Oil Co(Mt. Airy Shell) serve?
Shell Oil Co(Mt. Airy Shell) reports serving 152 people through 1 service connection in Frederick County, Maryland.
Where does Shell Oil Co(Mt. Airy 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 Shell Oil Co(Mt. Airy Shell) have any drinking water violations?
EPA's records list 7 violations for this system; all are health-based, and the most recent began in November 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 Shell Oil Co(Mt. Airy 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 7 violations for this system; all are health-based, and the most recent began in November 2013. For current results, consult EPA ECHO, or the MD state drinking water program.
Where can I find Shell Oil Co(Mt. Airy Shell)'s water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Shell Oil Co(Mt. Airy 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 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, “Shell Oil Co(Mt. Airy Shell), PWSID MD1101302, Maryland”, https://aquacensus.com/water-systems/maryland/shell-oil-co-mt-airy-shell-md1101302 (data as of October 1, 2026).