Clean Water Act discharge permit · NPDES CTP000020
BST SYSTEMS INC, Plainfield, CT: NPDES CTP000020 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 12Pollutants under a numeric limit
- 9Pollutants with an effluent exceedance
BST SYSTEMS INC holds NPDES permit CTP000020, which discharges to Moosup River. EPA’s file records it issued November 10, 2011 and expiring November 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 | BST SYSTEMS INC |
|---|---|
| Permittee as filed | BST SYSTEMS INC |
| NPDES ID | CTP000020 |
| 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 | November 10, 2011 |
| Expiration date | November 30, 2016 |
| Issuing agency | CT DEP |
| Address | Plainfield, CT 06374 |
| Receiving water | MOOSUP RIVER |
| Other EPA IDs (FRS) | RCRA handler CTD980906804 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 14Pollutants on file
- 12Under a numeric limit
- 14With a violation of any kind
- 9With 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 | 42 | 30 | December 31, 2024 | 17% over the limit |
| Flow | 3 | 33 | 20 | December 31, 2024 | 17% over the limit |
| Zinc, total [as Zn] | 4 | 25 | 8 | November 30, 2022 | 4,290% over the limit |
| Mercury, total [as Hg] | 2 | 19 | 5 | January 31, 2006 | 609% over the limit |
| pH | 4 | 20 | 2 | August 31, 2018 | |
| Lead, total [as Pb] | 4 | 16 | 2 | April 30, 2021 | 60% over the limit |
| Cyanide, free [amenable to chlorination] | 0 | 16 | 1 | October 31, 2021 | 1,500% over the limit |
| Chromium, total [as Cr] | 4 | 9 | 1 | August 31, 2010 | 34% over the limit |
| Flow rate | 0 | 1 | 1 | February 29, 2008 | 87% over the limit |
| Cadmium, total [as Cd] | 4 | 18 | 0 | ||
| Silver, total [as Ag] | 4 | 10 | 0 | ||
| Cyanide, total [as CN] | 4 | 6 | 0 | ||
| Manganese, total [as Mn] | 4 | 6 | 0 | ||
| Nickel, total [as Ni] | 4 | 6 | 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
- 3Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| December 17, 2024 | Effluent Violations - Numeric effluent violation | ST6 |
| December 17, 2024 | Pretreatment - Failure to submit required report (non-DMR) | ST6 |
| December 6, 2024 | Reporting Violations - Failure to Submit DMRs | 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 CTP000020 there.
Nearby on the register
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- Every permit record in Connecticut, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.