Public water system · PA5650032
ActiveMawc Sweeney Plant
At a glance
Mawc Sweeney Plant (PWSID PA5650032) is an active community water system in Westmoreland County, Pennsylvania. It reports serving 143,000 people through 60,233 service connections. Its primary water source is surface water, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in February 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
143,000
Service connections
60,233
Primary source
SW
Surface water
System type
CWS
Community water system
System record
How does Mawc Sweeney Plant compare with other water systems in Westmoreland County?
By EPA's size categories, Mawc Sweeney Plant is a very large system (more than 100,000 people). Westmoreland County has 74 active public water systems, and Mawc Sweeney Plant is the largest of them by population served. Its population served is about 40 times the county average of 3,544 people per system, and accounts for 55% 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 community water system reports serving 6,703 people, so Mawc Sweeney Plant is about 21 times 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. Pennsylvania has 1,762 active community water systems, 24% of the state's 7,217 active systems. Surface water means the system draws its water from rivers, lakes, streams or reservoirs. 246 Pennsylvania systems (3.4%) list surface water as their primary source.
Who owns and regulates Mawc Sweeney Plant?
EPA lists Mawc Sweeney Plant as owned by a local 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. 11 of the 74 active systems in Westmoreland County (15%) are also owned by a local government.
Does Mawc Sweeney Plant have drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in February 2025. The violations listed here began between June 2018 and February 2025. By type: 7 monitoring and reporting, 2 public notice, recordkeeping or other, 2 required treatment not met and 1 reporting. The contaminant or rule involved most often is Carbon, total (5 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2025-02-01 | Monitoring and reportingMonitoring of Treatment (SWTR-Filter) · code 36 | Surface Water Treatment Rulecode 0200 | No | Resolved |
| 2023-06-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2022-11-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2022-10-01 | Public notice, recordkeeping or otherConsumer Confidence Report Inadequate Reporting · code 72 | Consumer Confidence Rulecode 7000 | No | Resolved |
| 2020-09-01 | Monitoring and reportingMonitoring, Turbidity (Enhanced SWTR) · code 38 | Interim Enhanced Surface Water Treatment Rulecode 0300 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Total trihalomethanes (TTHM)code 2950 | No | Resolved |
| 2019-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Haloacetic acids (HAA5)code 2456 | No | Resolved |
| 2019-02-10 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2019-01-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2018-10-01 | Required treatment not metTreatment Technique Precursor Removal · code 46 | Carbon, totalcode 2920 | Yes | Resolved |
| 2018-07-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Carbon, totalcode 2920 | No | Resolved |
| 2018-06-01 | ReportingReport Sample Result/Fail Monitor (RTCR) · code 4B | Revised Total Coliform Rulecode 8000 | No | Resolved |
The 12 most recent 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.
Mawc Sweeney Plant: frequently asked questions
Who runs Mawc Sweeney Plant?
Mawc Sweeney Plant (PWSID PA5650032) is a community water system owned by a local government. It is regulated by the PA state drinking water program.
How many people does Mawc Sweeney Plant serve?
Mawc Sweeney Plant reports serving 143,000 people through 60,233 service connections in Westmoreland County, Pennsylvania.
Where does Mawc Sweeney Plant get its water?
EPA SDWIS lists this system's primary water source as surface water. Surface water means the system draws its water from rivers, lakes, streams or reservoirs.
Does Mawc Sweeney Plant have any drinking water violations?
Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in February 2025. 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 Mawc Sweeney Plant'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. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in February 2025. For current results, consult the system's annual water quality report, EPA ECHO, or the PA state drinking water program.
Where can I find Mawc Sweeney Plant's water quality report?
As a community water system, Mawc Sweeney Plant 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 Westmoreland County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| 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 |
| Mawc Furnace Run | Westmoreland | 3,100 | Community | Purchased surface water |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
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, “Mawc Sweeney Plant, PWSID PA5650032, Pennsylvania”, https://aquacensus.com/water-systems/pennsylvania/mawc-sweeney-plant-pa5650032 (data as of October 1, 2026).