Clean Water Act discharge permit · NPDES CTP002389
PROTON ENERGY SYSTEMS, INC., Wallingford, CT: NPDES CTP002389 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 21Pollutants under a numeric limit
- 5Pollutants with an effluent exceedance
PROTON ENERGY SYSTEMS, INC., held by PROTON ENERGY SYSTEMS, holds NPDES permit CTP002389, which discharges to Quinnipiac River. EPA’s file records it issued June 3, 2011 and expiring June 30, 2016. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | PROTON ENERGY SYSTEMS, INC. |
|---|---|
| Permittee as filed | PROTON ENERGY SYSTEMS |
| NPDES ID | CTP002389 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual industrial user permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 3, 2011 |
| Expiration date | June 30, 2016 |
| Issuing agency | CT DEP |
| Address | Wallingford, CT 06492 |
| Receiving water | QUINNIPIAC RIVER |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 21Pollutants on file
- 21Under a numeric limit
- 10With a violation of any kind
- 5With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Flow, maximum during 24 hr period | 3 | 3 | 2 | June 30, 2023 | 12,229% over the limit |
| pH | 6 | 2 | 2 | September 30, 2015 | |
| pH, maximum | 1 | 2 | 2 | February 28, 2018 | |
| Fluoride, total [as F] | 3 | 2 | 1 | August 31, 2007 | 3% over the limit |
| Flow | 4 | 1 | 1 | June 30, 2023 | 107% over the limit |
| Organics, total toxic [TTO] | 3 | 2 | 0 | ||
| Cyanide, total [as CN] | 3 | 1 | 0 | ||
| Zirconium, total | 1 | 1 | 0 | ||
| Platinum, total [as Pt] | 1 | 1 | 0 | ||
| pH, minimum | 1 | 1 | 0 | ||
| Chromium, total [as Cr] | 6 | 0 | 0 | ||
| Copper, total [as Cu] | 6 | 0 | 0 | ||
| Lead, total [as Pb] | 6 | 0 | 0 | ||
| Zinc, total [as Zn] | 6 | 0 | 0 | ||
| Cadmium, total [as Cd] | 5 | 0 | 0 | ||
| Nickel, total [as Ni] | 5 | 0 | 0 | ||
| Silver, total [as Ag] | 5 | 0 | 0 | ||
| Solids, total suspended | 4 | 0 | 0 | ||
| Titanium, total [as Ti] | 1 | 0 | 0 | ||
| Oil petroleum, total recoverable | 1 | 0 | 0 | ||
| Boron, total | 1 | 0 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 4Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| October 6, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| April 10, 2025 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| February 26, 2024 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| February 26, 2024 | Permit Violations - Violation Specified in Comment | ST6 |
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID CTP002389 there.
Nearby on the register
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- Every permit record in Wallingford, A to Z
- Discharge permits in Connecticut
- Every permit record in Connecticut, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.