Public water system · PA5650903
ActiveLoyalhanna Dam
At a glance
Loyalhanna Dam (PWSID PA5650903) is an active transient non-community water system in Westmoreland County, Pennsylvania. It reports serving 75 people through 7 service connections. Its primary water source is groundwater, and EPA lists it as owned by the federal government. EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in April 2022.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
75
Service connections
7
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does Loyalhanna Dam compare with other water systems in Westmoreland County?
By EPA's size categories, Loyalhanna Dam is a very small system (500 people or fewer). Westmoreland County has 74 active public water systems. Its population served is well below the county average of 3,544 people per system, and accounts for less than 0.1% of the 262,253 people reported by systems filed under the county. Across Pennsylvania, the 7,217 active systems average 1,741 people each. Nationally, the average active transient non-community water system reports serving 144 people, so Loyalhanna Dam is about half of 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. Pennsylvania has 4,429 active transient non-community water systems, 61% of the state's 7,217 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 6,632 Pennsylvania systems (92%) list groundwater as their primary source.
Who owns and regulates Loyalhanna Dam?
EPA lists Loyalhanna Dam as owned by the federal government. The PA state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 2 of the 74 active systems in Westmoreland County (2.7%) are also owned by the federal government.
Does Loyalhanna Dam have drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in April 2022. The violations listed here began between July 1995 and April 2022. By type: 2 monitoring, 2 monitoring and reporting and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Revised Total Coliform Rule (2 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 |
|---|---|---|---|---|
| 2022-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2016-04-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
| 2006-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1995-09-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1995-07-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | 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.
Loyalhanna Dam: frequently asked questions
Who runs Loyalhanna Dam?
Loyalhanna Dam (PWSID PA5650903) is a transient non-community water system owned by the federal government. It is regulated by the PA state drinking water program.
How many people does Loyalhanna Dam serve?
Loyalhanna Dam reports serving 75 people through 7 service connections in Westmoreland County, Pennsylvania.
Where does Loyalhanna Dam 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 Loyalhanna Dam have any drinking water violations?
EPA's records list 5 violations for this system; 1 is health-based, and the most recent began in April 2022. 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 Loyalhanna Dam'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; 1 is health-based, and the most recent began in April 2022. For current results, consult EPA ECHO, or the PA state drinking water program.
Where can I find Loyalhanna Dam's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Loyalhanna Dam 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 Westmoreland County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Mawc Sweeney Plant | Westmoreland | 143,000 | Community | Surface water |
| New Kensington Muni Auth | Westmoreland | 47,800 | Community | Surface water |
| Latrobe Muni Auth | Westmoreland | 30,000 | Community | Surface water |
| Highridge Water Auth | Westmoreland | 16,000 | Community | Surface water |
| Derry Boro Muni Auth | Westmoreland | 6,500 | Community | Surface water |
| Ligonier Twp Muni Auth | Westmoreland | 3,293 | Community | 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, “Loyalhanna Dam, PWSID PA5650903, Pennsylvania”, https://aquacensus.com/water-systems/pennsylvania/loyalhanna-dam-pa5650903 (data as of October 1, 2026).