Public water system · MD0080028
ActiveMariellen Park
At a glance
Mariellen Park (PWSID MD0080028) is an active community water system in Charles County, Maryland. It reports serving 184 people through 70 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. EPA's records list 5 violations for this system; none is health-based, and the most recent began in October 2023.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
184
Service connections
70
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Mariellen Park compare with other water systems in Charles County?
By EPA's size categories, Mariellen Park is a very small system (500 people or fewer). Charles County has 134 active public water systems. Its population served is about 39% below the county average of 300 people per system, and accounts for 0.5% of the 40,197 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 Mariellen Park 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 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 Mariellen Park?
EPA lists Mariellen Park 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. 11 of the 134 active systems in Charles County (8.2%) are also owned by a local government.
Does Mariellen Park have drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in October 2023. The violations listed here began between October 2008 and October 2023. By type: 5 monitoring and reporting. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 5 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 |
|---|---|---|---|---|
| 2023-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2017-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2014-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2011-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2008-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
All 5 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.
Mariellen Park: frequently asked questions
Who runs Mariellen Park?
Mariellen Park (PWSID MD0080028) is a community water system owned by a local government. It is regulated by the MD state drinking water program.
How many people does Mariellen Park serve?
Mariellen Park reports serving 184 people through 70 service connections in Charles County, Maryland.
Where does Mariellen Park 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 Mariellen Park have any drinking water violations?
EPA's records list 5 violations for this system; none is health-based, and the most recent began in October 2023. 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 Mariellen Park'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 5 violations for this system; none is health-based, and the most recent began in October 2023. For current results, consult the system's annual water quality report, EPA ECHO, or the MD state drinking water program.
Where can I find Mariellen Park's water quality report?
As a community water system, Mariellen Park 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 Charles County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Town of La Plata | Charles | 11,535 | Community | Groundwater |
| Town of Indian Head | Charles | 4,100 | Community | Groundwater |
| Naval Support Facility, Indian Head | Charles | 3,321 | Community | Groundwater |
| Potomac Heights | Charles | 1,800 | Community | Groundwater |
| Welcome Center (Newburg) | Charles | 1,004 | Transient non-community | Groundwater |
| Beantown Texaco Food -Dash in | Charles | 900 | Transient non-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, “Mariellen Park, PWSID MD0080028, Maryland”, https://aquacensus.com/water-systems/maryland/mariellen-park-md0080028 (data as of October 1, 2026).