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Clean Water Act discharge permit · NPDES CT0000434

AHLSTROM NONWOVENS LLC, Windsor Locks, CT: NPDES CT0000434 discharge permit, effluent exceedances, inspections, penalties

AHLSTROM NONWOVENS LLC holds NPDES permit CT0000434, which discharges to Connecticut River. EPA’s file records it issued September 24, 2009 and expiring September 30, 2014. 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 filedAHLSTROM NONWOVENS LLC
Permittee as filedAHLSTROM NONWOVENS LLC
NPDES IDCT0000434
Permit statusAdministratively continued (past its expiration date and still in force until reissued)
Permit typeIndividual permit
Discharger classMajor discharger
Facility typeNot a publicly owned treatment works
IssuedSeptember 24, 2009
Expiration dateSeptember 30, 2014
Issuing agencyCT DEP
AddressWindsor Locks, CT 06096
Receiving waterCONNECTICUT RIVER
Receiving water impaired303(D) Listed
SubwatershedFreshwater Brook-Connecticut River (HUC 010802050105)

Cited to the EPA ICIS-NPDES permit file (ECHO download).

Effluent limits and exceedances

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 measureLimitsViolations, any kindEffluent exceedancesLatest exceedanceLargest exceedance, as filed
LC50 Static 48Hr Acute Pimephales promelas299December 31, 202579% over the limit
pH3266March 31, 2023
LC50 Static 48Hr Acute D. Pulex255December 31, 202082% over the limit
Solids, total suspended11104June 30, 201956% over the limit
Temperature, water deg. fahrenheit3154July 31, 20244% over the limit
Chlorine, total residual1454July 31, 20042,036% over the limit
Oil & Grease244March 31, 2024194% over the limit
BOD, 5-day, 20 deg. C663May 31, 20158% over the limit
Flow rate133February 28, 20218% over the limit
Oxygen, dissolved [DO]1242January 31, 201478% over the limit
Flow1032February 28, 2022410% over the limit
Flow, maximum during 24 hr period2311February 28, 20221% over the limit
Flow rate2211August 31, 20250% over the limit
NOAEL Static 48Hr Acute D. pulex311July 31, 2013100% over the limit
Aluminum, total [as Al]920
Iron, total [as Fe]620
Nitrogen, total [as N]120
Pentachlorophenol120
Trichlorophenol120
Copper, total [as Cu]510
Manganese, total [as Mn]510
NOAEL Static 48Hr Acute Pimephales promelas310
Nitrogen, ammonia total [as N]110
Nitrogen, nitrite total [as N]110
Phosphorus, total [as P]110
Surfactants [MBAS]110
Bromine, reported as the element110
BOD, 5-day, percent removal010
Solids, suspended percent removal010
Zinc, total [as Zn]2000
Lead, total [as Pb]300
Epichlorohydrin200
Nitrogen, nitrate total [as N]100
Sulfate, total [as SO4]100
Nickel, total [as Ni]100
Solids, total dissolved100
Formaldehyde100

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

DateWhat EPA recordedAgency
December 9, 2025Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
October 15, 2025Permit Violations - Violation Specified in CommentST6
October 15, 2025Reporting Violations - Improper/ Incorrect ReportingST6
October 15, 2025Effluent Violations - Failed Toxicity TestST6
October 15, 2025Reporting Violations - Failure to NotifyST6
October 15, 2025Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
October 15, 2025Monitoring Violations - Failure to Monitor for Toxicity RequirementsST6
October 15, 2025Management Practice Violations - Failure to Maintain RecordsST6
October 15, 2025Effluent Violations - Numeric effluent violationST6
January 31, 2023Effluent Violations - Numeric effluent violationST6
January 31, 2023Reporting Violations - Failure to NotifyST6
January 31, 2023Effluent Violations - Failed Toxicity TestST6
January 31, 2023Permit Violations - Violation Specified in CommentST6
January 31, 2023Reporting Violations - Failure to submit required report (non-DMR non-pretreatment)ST6
January 31, 2023Reporting Violations - Improper/ Incorrect ReportingST6

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, CT0000434.

Start the watch

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  • One watershed — $2,990/year
  • One state — $4,990/year
  • The whole register — $18,000/year

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 CT0000434 there.

Nearby on the register

Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.