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Non-Transient Non-Community Water System · PWS PA1460847

Constellation Nuclear Pwr Plnt

Pottstown, Pennsylvania 19464 - drinking water served from groundwater sources to 1,650 people, tracked in EPA SDWIS and UCMR5.

1,650
People served
123
EPA violations
4
Health-based
Untested
UCMR5 result

The verdict

EPA records 123 drinking-water violations at Constellation Nuclear Pwr Plnt, 3% of them health-based - below the Pennsylvania per-system average.

123
Total EPA violations on record
3%
Health-based (MCL / treatment failure)
1,650
People served by this system
N/A
PFAS compounds detected (UCMR5)

Water Quality Snapshot: Constellation Nuclear Pwr Plnt

Constellation Nuclear Pwr Plnt is a local-owned non-transient non-community water system that delivers drinking water to 1,650 residents in Pottstown, Pennsylvania (Montgomery County) through 9 service connections. Its water is drawn from groundwater sources. EPA's Safe Drinking Water Information System records 123 total violations for this system , of which 4 (3%) are health-based, meaning a contaminant exceeded an EPA Maximum Contaminant Level or a required treatment technique failed. A further 112 monitoring and reporting violations are on file. The most recent violation on record dates to 2025.

The most frequently cited contaminant at this system is 1,2-DIBROMO-3-CHLOROPROPANE, recorded in 10 violations (MR). This system has not yet been sampled under EPA's UCMR5 PFAS monitoring program, so no PFAS detection data is available here.

Across Pennsylvania, EPA tracks 7,701 public water systems serving 12,630,061 people, with 1,159,868 cumulative violations and 68,517 health-based violations on record. About 97% of systems in the state carry at least one violation, and state-wide the average per system is 150.6 violations. Statewide, 224 of 389 UCMR5-tested systems have reported PFAS detections (57.6%).

Constellation Nuclear Pwr Plnt's 123 violations sit below the Pennsylvania average.

All figures above are sourced directly from EPA SDWIS and UCMR5 public data releases and are updated as EPA publishes new reporting cycles.

Population Served
1,650
Total Violations
123
Health-Based Violations
4
Water Source
Groundwater

System Details

System Type
Non-Transient Non-Community
Owner Type
Local
Connections
9
County
Montgomery
School/Daycare
No
MCL Violations
4
Monitoring Violations
112
Treatment Tech Violations
0

Violation History

Contaminant violations recorded by EPA.

Contaminant Category Count Latest
1,2-DIBROMO-3-CHLOROPROPANE MR 10 1996
BHC-GAMMA MR 10 1996
Methoxychlor MR 10 1996
ETHYLENE DIBROMIDE MR 10 1996
LASSO MR 8 1996
Atrazine MR 8 1996
Simazine MR 7 1996
Arsenic MR 7 2006
Public Notice Other 4 2006
Arsenic MCL 4 2005
CYANIDE MR 3 1997
Fluoride MR 3 1997
Nickel MR 3 1997
Selenium MR 3 1997
Antimony, Total MR 3 1997
Nitrate MR 3 1999
Beryllium, Total MR 3 1997
Barium MR 3 1997
Mercury MR 3 1997
Chromium MR 3 1997
Cadmium MR 3 1997
Thallium, Total MR 3 1997
Chlorine MR 2 2011
Coliform (TCR) MR 2 1998
Lead and Copper Rule MR 2 2025

Verify This Water System

The figures above are aggregated from EPA's public databases. To verify the underlying records, or to file a complaint, request a Consumer Confidence Report, or check current monitoring status, go directly to the federal and state regulators that enforce the Safe Drinking Water Act for Constellation Nuclear Pwr Plnt.

Federal Source of Truth

EPA SDWIS, Federal Reports

EPA's Safe Drinking Water Information System (SDWIS) holds the federal compliance record for every regulated public water system. Open the system-level report by PWS ID:

View PWS ID PA1460847 on SDWIS

Source: EPA SDWIS Federal Reports Search

State Regulator

Pennsylvania Drinking Water Authority

Pennsylvania DEP, Bureau of Safe Drinking Water is the primacy agency that licenses and inspects Constellation Nuclear Pwr Plnt under EPA-delegated authority.

Open PA regulator portal

Source: Pennsylvania DEP, Bureau of Safe Drinking Water

Violation Timeline

Each row links to the EPA SDWIS public record for verification. Cross-reference the contaminant code on EPA's federal report to see violation dates, return-to-compliance status, and enforcement actions.

Year (latest) Contaminant Category Count EPA Record
2025 Lead and Copper Rule MR 2 SDWIS / PA1460847 / 5000
2011 Chlorine MR 2 SDWIS / PA1460847 / 0999
2006 Arsenic MR 7 SDWIS / PA1460847 / 1005
2006 Public Notice Other 4 SDWIS / PA1460847 / 7500
2005 Arsenic MCL 4 SDWIS / PA1460847 / 1005
1999 Nitrate MR 3 SDWIS / PA1460847 / 1040
1998 Coliform (TCR) MR 2 SDWIS / PA1460847 / 3100
1997 CYANIDE MR 3 SDWIS / PA1460847 / 1024
1997 Fluoride MR 3 SDWIS / PA1460847 / 1025
1997 Nickel MR 3 SDWIS / PA1460847 / 1036
1997 Selenium MR 3 SDWIS / PA1460847 / 1045
1997 Antimony, Total MR 3 SDWIS / PA1460847 / 1074
1997 Beryllium, Total MR 3 SDWIS / PA1460847 / 1075
1997 Barium MR 3 SDWIS / PA1460847 / 1010
1997 Mercury MR 3 SDWIS / PA1460847 / 1035

How Constellation Nuclear Pwr Plnt Compares

Cross-reference this system's record against state averages and the federal MCL framework for context.

Metric Constellation Nuclear Pwr Plnt Pennsylvania avg Federal benchmark
Total violations 123 150.6 SDWA compliance, any non-zero count is a recorded breach
Health-based violations 4 8.9 Indicates a contaminant exceeded a federal MCL
PFAS detection None 57.6% EPA final rule (2024): PFOA/PFOS MCL = 4.0 ppt
Population served 1,650 1,640 Sizing context for compliance burden

Sources: EPA SDWIS and EPA National Primary Drinking Water Regulations (40 CFR Part 141). State averages computed across 7,701 regulated public water systems in Pennsylvania.

Federal MCL reference, Safe Drinking Water Act thresholds ▼
Contaminant Federal MCL / Action Level Note
Lead 0 mg/L (Action Level: 0.015 mg/L) Lead and Copper Rule treatment technique
Arsenic 0.010 mg/L (10 ppb) Health-based MCL since 2006
Total Coliform Treatment technique (RTCR) Indicator organism, monitoring trigger
PFOA / PFOS (PFAS) 4.0 ppt each (final 2024 rule) Compliance deadline 2029 (EPA proposed extending to 2031, not yet final as of May 2026)
Nitrate (as N) 10 mg/L Acute health risk for infants

Frequently Asked Questions

Is Constellation Nuclear Pwr Plnt water safe to drink? ▼
Constellation Nuclear Pwr Plnt (PWS ID: PA1460847) has 123 recorded violations in the EPA SDWIS database. No PFAS contamination was detected in UCMR5 testing. This system serves 1,650 people using Groundwater sources.
How many people does Constellation Nuclear Pwr Plnt serve? ▼
Constellation Nuclear Pwr Plnt serves 1,650 people in Pottstown, Pennsylvania. It is a Local-owned system using Groundwater water sources with 9 service connections.
What type of violations does Constellation Nuclear Pwr Plnt have? ▼
Constellation Nuclear Pwr Plnt has 123 total violations: 4 health-based violations (MCL exceedances or treatment failures), 112 monitoring/reporting violations, and 0 treatment technique violations. Health-based violations indicate contaminant levels exceeded EPA safe limits.
Has PFAS been detected in Constellation Nuclear Pwr Plnt water? ▼
No PFAS testing data is available for Constellation Nuclear Pwr Plnt under the EPA's UCMR5 monitoring program.
What water source does Constellation Nuclear Pwr Plnt use? ▼
Constellation Nuclear Pwr Plnt uses Groundwater as its primary water source. It is classified as a Non-Transient Non-Community Water System, serving the same people for at least 6 months per year.
Where does this data come from? ▼
All data comes from the EPA Safe Drinking Water Information System (SDWIS) and the UCMR5 PFAS monitoring program. SDWIS tracks compliance for all public water systems regulated under the Safe Drinking Water Act.
Data Sources: EPA Safe Drinking Water Information System (SDWIS), Q4 2025. This data is provided for informational purposes only.

Read our methodology - how this data is sourced, computed, and verified.

Data sourced from EPA SDWIS and UCMR5 PFAS monitoring data. See our methodology for details. Retrieved and formatted by PlainWater Editorial

Every figure on PlainWater is rendered directly from EPA SDWIS drinking-water data, no number is typed in by an editor. This system's figures are rendered directly from EPA SDWIS data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.