Clean Water Act discharge permit · NPDES CT0100307
MATTABASSETT DISTRICT CROMWELL, Cromwell, CT: NPDES CT0100307 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 24Pollutants under a numeric limit
- 10Pollutants with an effluent exceedance
MATTABASSETT DISTRICT CROMWELL holds NPDES permit CT0100307, which discharges to Connecticut River. EPA’s file records it issued June 30, 2009 and expiring June 30, 2014. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | MATTABASSETT DISTRICT CROMWELL |
|---|---|
| Permittee as filed | MATTABASSETT DISTRICT CROMWELL |
| NPDES ID | CT0100307 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Publicly owned treatment works |
| Program | Publicly owned treatment works |
| Issued | June 30, 2009 |
| Expiration date | June 30, 2014 |
| Issuing agency | CT DEP |
| Address | Cromwell, CT 06416 |
| Receiving water | CONNECTICUT RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Reservoir Brook-Connecticut River (HUC 010802050506) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 25Pollutants on file
- 24Under a numeric limit
- 10With a violation of any kind
- 10With 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, in conduit or thru treatment plant | 2 | 28 | 28 | January 31, 2009 | 44% over the limit |
| Solids, total suspended | 3 | 11 | 11 | June 30, 2024 | 99,999% over the limit |
| Coliform, fecal general | 2 | 9 | 9 | May 31, 2014 | 99,999% over the limit |
| Carbonaceous oxygen demand, % removal | 1 | 9 | 9 | April 30, 2004 | 173% over the limit |
| Chlorine, total residual | 2 | 3 | 3 | June 30, 2019 | 50% over the limit |
| Enterococci | 0 | 3 | 3 | September 30, 2023 | 384% over the limit |
| BOD, carbonaceous [5 day, 5 C] | 3 | 2 | 2 | January 31, 2019 | 84% over the limit |
| NOAEL Static 48Hr Acute D. pulex | 2 | 1 | 1 | November 30, 2012 | 7% over the limit |
| NOAEL Static 48Hr Acute Pimephales promelas | 2 | 1 | 1 | February 28, 2014 | 9% over the limit |
| Solids, suspended percent removal | 1 | 1 | 1 | December 31, 2003 | 60% over the limit |
| pH | 2 | 0 | 0 | ||
| Nitrogen, total [as N] | 1 | 0 | 0 | ||
| Polychlorinated biphenyls [PCBs] | 1 | 0 | 0 | ||
| Arsenic, sludge tot. dry wt [as As] | 1 | 0 | 0 | ||
| Beryllium, sludge, tot. dry wt [as Be] | 1 | 0 | 0 | ||
| Solids, total, percent | 1 | 0 | 0 | ||
| Solids, fixed, % of total solids | 1 | 0 | 0 | ||
| Solids, volatile % of total solids | 1 | 0 | 0 | ||
| Zinc, sludge, total, dry weight [as Zn] | 1 | 0 | 0 | ||
| Lead, sludge, total, dry weight [as Pb] | 1 | 0 | 0 | ||
| Nickel, sludge, total, dry weight [as Ni] | 1 | 0 | 0 | ||
| Mercury, sludge, total, dry weight [as Hg] | 1 | 0 | 0 | ||
| Chromium, sludge, total, dry weight [as Cr] | 1 | 0 | 0 | ||
| Copper, sludge, total, dry weight [as Cu] | 1 | 0 | 0 | ||
| Cadmium, sludge, total, dry weight [as Cd] | 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
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES CT0100307.
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
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, CT0100307.
Start the watch
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How we handle your data → Privacy
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 CT0100307 there.
Nearby on the register
- Discharge permits in Cromwell
- Every permit record in Cromwell, A to Z
- Discharge permits in Connecticut
- Every permit record in Connecticut, A to Z
Figures from EPA’s ICIS-NPDES download, loaded September 14, 2026.