Public water system · PA1460847
ActiveConstellation Nuclear Pwr Plnt
At a glance
Constellation Nuclear Pwr Plnt (PWSID PA1460847) is an active non-transient non-community water system in Montgomery County, Pennsylvania. It reports serving 1,650 people through 9 service connections. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2025.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
1,650
Service connections
9
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Constellation Nuclear Pwr Plnt compare with other water systems in Montgomery County?
By EPA's size categories, Constellation Nuclear Pwr Plnt is a small system (501 to 3,300 people). Montgomery County has 166 active public water systems. Its population served is well below the county average of 7,675 people per system, and accounts for 0.1% of the 1,274,113 people reported by systems filed under the county. Across Pennsylvania, the 7,217 active systems average 1,741 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Constellation Nuclear Pwr Plnt is about 3.8 times 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. Pennsylvania has 1,026 active non-transient non-community water systems, 14% 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 Constellation Nuclear Pwr Plnt?
EPA lists Constellation Nuclear Pwr Plnt 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. 15 of the 166 active systems in Montgomery County (9%) are also owned by a local government.
Does Constellation Nuclear Pwr Plnt have drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 2025. The violations listed here began between January 1997 and January 2025. By type: 10 monitoring and reporting, 1 public notice, recordkeeping or other and 1 contaminant level above the legal limit. The contaminant or rule involved most often is Lead and Copper Rule (2 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 |
|---|---|---|---|---|
| 2025-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2022-01-01 | Monitoring and reportingLead Consumer Notice · code 66 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2011-01-01 | Monitoring and reportingMonitoring and Reporting (DBP) · code 27 | Chlorinecode 0999 | No | Resolved |
| 2006-05-11 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2006-01-01 | Monitoring and reportingMonitoring, Check/Repeat/Confirmation · code 04 | Arseniccode 1005 | No | Resolved |
| 2005-04-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Single Sample · code 01 | Arseniccode 1005 | Yes | Resolved |
| 1999-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 1998-06-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1998-05-01 | Monitoring and reportingMonitoring, Routine Minor (TCR) · code 24 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Cyanidecode 1024 | No | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Antimonycode 1074 | No | Resolved |
| 1997-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nickelcode 1036 | 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.
Constellation Nuclear Pwr Plnt: frequently asked questions
Who runs Constellation Nuclear Pwr Plnt?
Constellation Nuclear Pwr Plnt (PWSID PA1460847) is a non-transient non-community water system owned by a local government. It is regulated by the PA state drinking water program.
How many people does Constellation Nuclear Pwr Plnt serve?
Constellation Nuclear Pwr Plnt reports serving 1,650 people through 9 service connections in Montgomery County, Pennsylvania.
Where does Constellation Nuclear Pwr Plnt 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 Constellation Nuclear Pwr Plnt have any drinking water violations?
Of the 12 most recent violations in EPA's records, one is health-based, and the most recent began in January 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 Constellation Nuclear Pwr Plnt'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, one is health-based, and the most recent began in January 2025. For current results, consult EPA ECHO, or the PA state drinking water program.
Where can I find Constellation Nuclear Pwr Plnt's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Constellation Nuclear Pwr Plnt 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 Montgomery County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Aqua Pa Main System | Montgomery | 822,600 | Community | Surface water |
| North Penn Water Authority | Montgomery | 91,941 | Community | Purchased surface water |
| Pa American Norristown | Montgomery | 88,885 | Community | Surface water |
| North Wales Water Authority | Montgomery | 72,496 | Community | Surface water |
| Pottstown Borough Water Auth | Montgomery | 36,000 | Community | Surface water |
| Horsham Water&Sewer Authority | Montgomery | 26,000 | Community | Purchased 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, “Constellation Nuclear Pwr Plnt, PWSID PA1460847, Pennsylvania”, https://aquacensus.com/water-systems/pennsylvania/constellation-nuclear-pwr-plnt-pa1460847 (data as of October 1, 2026).