Public water system · MD0120006
ActiveConowingo Hydroelectric Station
At a glance
Conowingo Hydroelectric Station (PWSID MD0120006) is an active non-transient non-community water system in Harford County, Maryland. It reports serving 90 people through 4 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2002.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
90
Service connections
4
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Conowingo Hydroelectric Station compare with other water systems in Harford County?
By EPA's size categories, Conowingo Hydroelectric Station is a very small system (500 people or fewer). Harford County has 226 active public water systems. Its population served is well below the county average of 956 people per system, and accounts for less than 0.1% of the 215,993 people reported by systems filed under the county. Across Maryland, the 2,992 active systems average 1,947 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Conowingo Hydroelectric Station is well below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Maryland has 491 active non-transient non-community water systems, 16% 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 Conowingo Hydroelectric Station?
EPA lists Conowingo Hydroelectric Station 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. 176 of the 226 active systems in Harford County (78%) are also privately owned.
Does Conowingo Hydroelectric Station have drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2002. By type: 1 monitoring and reporting. The contaminant or rule involved is Lead and Copper Rule. EPA lists 1 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 |
|---|---|---|---|---|
| 2002-10-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
The one violation in EPA's records.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.
Conowingo Hydroelectric Station: frequently asked questions
Who runs Conowingo Hydroelectric Station?
Conowingo Hydroelectric Station (PWSID MD0120006) is a non-transient non-community water system privately owned. It is regulated by the MD state drinking water program.
How many people does Conowingo Hydroelectric Station serve?
Conowingo Hydroelectric Station reports serving 90 people through 4 service connections in Harford County, Maryland.
Where does Conowingo Hydroelectric Station 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 Conowingo Hydroelectric Station have any drinking water violations?
EPA's records list one violation for this system; it is not health-based, and the most recent began in October 2002. 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 Conowingo Hydroelectric Station'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 one violation for this system; it is not health-based, and the most recent began in October 2002. For current results, consult EPA ECHO, or the MD state drinking water program.
Where can I find Conowingo Hydroelectric Station's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Conowingo Hydroelectric Station is a non-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 Harford County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Harford County D.P.W. | Harford | 104,567 | Community | Surface water |
| City of Aberdeen | Harford | 18,006 | Community | Purchased surface water |
| Chapel Hill - Aberdeen Proving Grounds | Harford | 15,000 | Community | Groundwater |
| City of Havre De Grace | Harford | 14,000 | Community | Surface water |
| Maryland American Water Company | Harford | 13,200 | Community | Surface water |
| Harford Community College - Main Campus | Harford | 2,500 | Non-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, “Conowingo Hydroelectric Station, PWSID MD0120006, Maryland”, https://aquacensus.com/water-systems/maryland/conowingo-hydroelectric-station-md0120006 (data as of October 1, 2026).