Non-Compliance Clean Water Act RCRA

ZYGO CORPORATION

Quick Summary

•Currently out of compliance in at least one environmental program (CAA, CWA, or RCRA).
•Assessed $0 in total penalties since records began.

Address: 21 LAUREL BROOK RD
MIDDLEFIELD, CT 06455
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County: MIDDLESEX County
Industry: Manufacturing
NAICS (North American Industry Classification): 333295
Inspections: 3 · last Jan 5, 2026
Total Penalties: $0 · last Apr 11, 2002
Registry ID: 110030345589

Compliance Status (Last 12 Quarters)

Number of calendar quarters, out of the last 12, in which this facility was in violation of its permit. Zero means no recorded violations in that program over the past three years.

Water (CWA)
Qtrs Non-Compliant

Hazardous Waste (RCRA)
Qtrs Non-Compliant

Compliance Violations

Individual permit violations recorded by the EPA across air, water, and hazardous waste programs. Open violations are unresolved as of the most recent ECHO data update.

Program	Type	Violation Date	Return to Compliance	Status
cwa	Reporting Violations - Improper/ Incorrect Reporting	Jan 5, 2026	—	Open
cwa	Effluent Violations - Numeric effluent violation	Jan 5, 2026	—	Open
cwa	Reporting Violations - Late Submittal of DMRs	Jan 5, 2026	—	Open
cwa	Reporting Violations - Late Submittal of DMRs	Feb 24, 2025	—	Open
cwa	Management Practice Violations - Failure to Maintain Records	Feb 24, 2025	—	Open
cwa	Reporting Violations - Improper/ Incorrect Reporting	Feb 24, 2025	—	Open
cwa	Reporting Violations - Failure to Notify	Feb 24, 2025	—	Open
cwa	Monitoring Violations - Invalid/Unrepresentative Sample	Nov 18, 2024	—	Open
cwa	Permit Violations - Violation Specified in Comment	Nov 18, 2024	—	Open
cwa	Effluent Violations - Numeric effluent violation	Nov 18, 2024	—	Open
cwa	Reporting Violations - Improper/ Incorrect Reporting	Nov 18, 2024	—	Open
cwa	Management Practice Violations - Failure to Maintain Records	Nov 18, 2024	—	Open
cwa	Reporting Violations - Failure to Notify	Dec 13, 2023	—	Open
cwa	Permit Violations - Violation Specified in Comment	Dec 13, 2023	—	Open
cwa	Monitoring Violations - Invalid/Unrepresentative Sample	Dec 13, 2023	—	Open
cwa	Effluent Violations - Numeric effluent violation	Dec 13, 2023	—	Open
cwa	Reporting Violations - Improper/ Incorrect Reporting	Dec 13, 2023	—	Open
cwa	Schedule Event unachieved and not reported	Oct 3, 2023	Nov 13, 2023	Resolved
cwa	Schedule Event reported late	Oct 3, 2023	—	Open
cwa	Schedule Event achieved late but reported	Oct 3, 2023	—	Open
cwa	Schedule Event unachieved but reported	Oct 3, 2023	Nov 13, 2023	Resolved
rcra	Standards Applicable to Generators of HW: General	Jul 11, 2001	Oct 29, 2001	Resolved
rcra	Standards Applicable to Generators of HW: Pre-Transport Requirements Applicable to Small and Large Quantity Generators	Jul 11, 2001	Apr 1, 2002	Resolved
rcra	Standards Applicable to Generators of HW: General	Mar 13, 1987	Jul 11, 2001	Resolved

Discharge Limit Exceedances

Instances where this facility's reported discharge monitoring results exceeded its permitted limits under the Clean Water Act. Exceedance percentage shows how far over the permit limit the discharge was.

Pollutant	Violation	Reported	Limit	Exceedance	Period	Status
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.09 mg/L	0.05	+73%	Jan 2026	Open
Zinc, total [as Zn]	DMR, Limited - Numeric Violation	1.64 mg/L	1.00	+64%	Jul 2025	Open
Solids, total suspended	DMR, Limited - Numeric Violation	133.00 mg/L	100.00	+33%	Jun 2025	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	1.26 mg/L	0.05	+2,420%	Jun 2025	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.05 mg/L	0.05	+2%	Oct 2024	Open
Solids, total suspended	DMR, Limited - Numeric Violation	131.00 mg/L	100.00	+31%	Jul 2024	Open
Oil & Grease	DMR, Limited - Numeric Violation	108.00 mg/L	100.00	+8%	Jun 2024	Open
Fluoride, total [as F]	DMR, Limited - Numeric Violation	69.00 mg/L	30.00	+130%	Jun 2024	Open
Fluoride, total [as F]	DMR, Limited - Numeric Violation	23.58 mg/L	20.00	+18%	Jun 2024	Open
Oil & Grease	DMR, Limited - Numeric Violation	108.00 mg/L	100.00	+8%	May 2024	Open
Flow, maximum during 24 hr period	DMR, Limited - Numeric Violation	0.00 MGD	0.00	+3%	Apr 2024	Open
Oil & Grease	DMR, Limited - Numeric Violation	187.00 mg/L	100.00	+87%	Feb 2024	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.06 mg/L	0.05	+10%	Jan 2024	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.20 mg/L	0.05	+294%	Dec 2023	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.45 mg/L	0.05	+796%	Nov 2023	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.14 mg/L	0.05	+172%	Oct 2023	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.38 mg/L	0.05	+660%	Sep 2023	Open
Fluoride, total [as F]	DMR, Limited - Numeric Violation	32.30 mg/L	30.00	+8%	Sep 2023	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.27 mg/L	0.05	+432%	Aug 2023	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.19 mg/L	0.05	+286%	Jul 2023	Open
Fluoride, total [as F]	DMR, Limited - Numeric Violation	20.90 mg/L	20.00	+5%	Jun 2023	Open
Arsenic, total [as As]	DMR, Limited - Numeric Violation	0.44 mg/L	0.05	+770%	May 2023	Open

Enforcement Actions

Formal enforcement cases brought by the EPA or state agencies, including administrative orders and civil penalties assessed. Penalty amounts reflect what was formally assessed, not necessarily what was collected.

WRITTEN INFORMAL

RCRA (Hazardous Waste) · Case RCRA-CTD052536570-001 · Apr 11, 2002

$8,596

WRITTEN INFORMAL

RCRA (Hazardous Waste) · Case RCRA-CTD052536570-003 · May 20, 1987