Clean Water Act discharge permit · NPDES CT0003981
SPECIALTY MINERALS DOLOMITE PLANT, Canaan, CT: NPDES CT0003981 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 19Pollutants under a numeric limit
- 0Pollutants with an effluent exceedance
SPECIALTY MINERALS DOLOMITE PLANT, held by SPECIALTY MINERALS, INC., holds NPDES permit CT0003981, which discharges to Blackberry River. EPA’s file records it issued June 1, 2012 and expiring May 31, 2017. 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 | SPECIALTY MINERALS DOLOMITE PLANT |
|---|---|
| Permittee as filed | SPECIALTY MINERALS, INC. |
| NPDES ID | CT0003981 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | June 1, 2012 |
| Expiration date | May 31, 2017 |
| Issuing agency | CT DEP |
| Address | Canaan, CT 06018 |
| Receiving water | BLACKBERRY RIVER |
| Receiving water impaired | 303(D) Listed |
| Subwatershed | Blackberry River (HUC 011000050303) |
| Other EPA IDs (FRS) | RCRA handler CTD001442979; ICIS-AIR source CT0000000900500046 |
Cited to the EPA ICIS-NPDES permit file (ECHO download); cross-program IDs from EPA’s FRS facility-registry crosswalk.
Effluent limits and exceedances
- 19Pollutants on file
- 19Under a numeric limit
- 19With a violation of any kind
- 0With 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 |
|---|---|---|---|---|---|
| pH | 4 | 28 | 0 | ||
| NOAEL Static 48Hr Acute D. pulex | 4 | 14 | 0 | ||
| NOAEL Static 48Hr Acute Pimephales promelas | 4 | 14 | 0 | ||
| E. coli | 3 | 14 | 0 | ||
| Solids, total suspended | 2 | 14 | 0 | ||
| Oil & Grease | 2 | 14 | 0 | ||
| Nitrogen, ammonia total [as N] | 2 | 14 | 0 | ||
| Nitrogen, Kjeldahl, total [as N] | 2 | 14 | 0 | ||
| Phosphorus, total [as P] | 2 | 14 | 0 | ||
| Copper, total [as Cu] | 2 | 14 | 0 | ||
| Lead, total [as Pb] | 2 | 14 | 0 | ||
| Manganese, total [as Mn] | 2 | 14 | 0 | ||
| Zinc, total [as Zn] | 2 | 14 | 0 | ||
| Chlorine, total residual | 2 | 14 | 0 | ||
| Oxygen demand, chem. [low level] [COD] | 2 | 12 | 0 | ||
| Nitrogen, nitrate total [as N] | 2 | 10 | 0 | ||
| Flow rate | 1 | 9 | 0 | ||
| Flow, maximum during 24 hr period | 1 | 9 | 0 | ||
| Flow | 1 | 9 | 0 |
EPA’s effluent violation file records no exceedance of a numeric limit for NPDES CT0003981.
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
- 9Single-event violations
| Date | What EPA recorded | Agency |
|---|---|---|
| September 23, 2024 | Management Practice Violations - Failure to Maintain Records | ST6 |
| November 9, 2021 | Management Practice Violations - Improper Operation and Maintenance | ST6 |
| November 9, 2021 | Management Practice Violations - Best Management Practice Deficiencies | ST6 |
| November 9, 2021 | Monitoring Violations - Invalid/Unrepresentative Sample | ST6 |
| November 9, 2021 | Permit Violations - Discharge Without a Valid Permit | ST6 |
| November 9, 2021 | Reporting Violations - Improper/ Incorrect Reporting | ST6 |
| November 9, 2021 | Monitoring Violations - Improper Analysis or Lab Error | ST6 |
| November 9, 2021 | Management Practice Violations - Failure to Maintain Records | ST6 |
| November 9, 2021 | 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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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 CT0003981 there.
Nearby on the register
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.