Non-Transient Non-Community Water System · PWS PA1460847
Constellation Nuclear Pwr Plnt
Operator location Pottstown, Pennsylvania - upper-third violation load (> 74 violations) with 123 EPA violations; groundwater source; 1,650 served (PWS-level, not municipal population).
- 1,650
- People served (this PWS)
- 123
- EPA violations (this PWS)
- 4
- Health-based (this PWS)
- Untested
- UCMR5 (this PWS)
Constellation Nuclear Pwr Plnt standing, high SDWIS violation third
123 EPA SDWIS violations on record - upper-third violation load (> 74 violations). Corpus terciles use 29,740 systems serving 500+ (the sitemap cohort). Health-based share 3% is middle-third health share (≤ 23%). Population rank #15,107 of 29,740 among systems serving 500+.
The verdict
Constellation Nuclear Pwr Plnt sits in the upper third of the sitemap cohort by violation count (123), so the tables below sample a dense compliance trail rather than a near-clean ledger. Population served is mid-pack at 1,650 (mid served population (≤ 3,309)). Health-based share is 3% (middle-third health share (≤ 23%)). No UCMR5 PFAS test appears for this system in this extract.
- #15,107 of 29,740
- Population · /systems
- #587 of 1,340
- Population · PA
- 123
- Total EPA violations on record
- 3%
- Health-based (MCL / treatment failure)
Population ordinals match the sitemap cohort (systems serving 500+, population_served DESC). See methodology · corpus placement.
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 |
Violation Count vs. the National Corpus
Constellation Nuclear Pwr Plnt has 123 recorded EPA violations, 77% of the 29,740 public water systems serving 500+ people nationwide carry fewer, and 23% carry more. 3% of this system's own violations are health-based (4 of 123), and it ranks #15,107 of 29,740 by population served among that same cohort.
EPA violations vs. the national water-system corpus
Public water systems serving 500+ people (EPA SDWIS)
123 Higher than most more violations than 77% of 29,740 water systems
the national water-system corpus, bucketed by value
Each bar is a band; taller bars hold more water systems. The dashed line + filled bar mark this entry. Hover or tap any bar for its full count and share, and where it sits relative to this entry.
Source EPA SDWIS · 2026-05-15
SDWIS compliance record for Constellation Nuclear Pwr Plnt
123 violations on record for PA1460847; use EPA SDWIS to confirm return-to-compliance dates and monitoring categories.
Sources: EPA SDWIS · Pennsylvania DEP, Bureau of Safe Drinking Water
Nationwide peers
123 violations · 1,650 served: nearest cross-state SDWIS matches.
Cross-state systems with comparable violation load
Nearest cross-state community systems (500+ served) by total SDWIS violations on record.
Cross-state systems near this population served
Nearest cross-state systems by EPA SDWIS population_served (same 500+ sitemap gate).
What to do with Constellation Nuclear Pwr Plnt
Use this system's EPA-reported record as a starting filter, not a final verdict.
- See how every tracked system in Pennsylvania compares on the same EPA violation measures. Pennsylvania systems
- Check whether PFAS was detected at this system under UCMR5 testing. PFAS guide
- Find and compare another public water system by name or PWSID. Search systems
EPA SDWIS and UCMR5 figures are informational only, not a substitute for a certified lab test of your own tap water.