General Information
Party ID	Party Name	Party Classification	Mailing Address	Work Phone	Email/Website
S660366	CTK USA INC	Privately-Owned Business	2110 S Parco Ave Ontario, CA 91761	909-406-5388 1008	accounting@ctkusa.com	

Related Places
Place ID	Place Name	County	Region	Place Type	Relationship to Party	Relationship Start Date	Relationship End Date
S878374	CTK USA INC	San Bernardino	8	Facility	Discharger	01/10/2020	null	

Related Parties
Party ID	Party Name	Party Type	Role/Relationship	Relationship Start Date	Relationship End Date	Classification
N/A	Chang Oh	Contact	Owner Contact	null	null	null	

Regulatory Measures(non-enforcement)
Reg. Measure ID	Regulatory Measure Type	Region	WDID	Title	Status	Program	Order No.	RM Effective Date	RM Termination Date	Relationship	Relationship Start Date	Relationship End Date
S516205	Industrial	8	8 36NEC006150	Notice Of Intent New Application	Active	INDSTW	2014-0057-DWQ	02/25/2020	null	Discharger	01/10/2020	null	

Violations within the past calendar year
Violation ID	Occurrence Date	Violation Type	Violation Description	Violation Status	Priority	Source	Facility Name	Violated Reg. Meas. ID	Violated Reg. Meas. Order No.	Linked To Enf.
S901200	10/02/2025	SW - Failure to meet NEC criteria	Failure to re-certify the NEC for 2025-2026 reporting year.	Violation	N	Report	CTK USA INC	S516205	2014-0057-DWQ	Y	

Enforcement Actions
Enforcement ID	Enforcement Type	Enf. Order No.	Title	Program	Effective Date	Status
S466684	Notice of Violation	null	8 36NEC006150	INDSTW	10/17/2025	Active	
S449002	Notice of Violation	null	8 36NEC006150	INDSTW	12/09/2022	Active	

Regulatory Measures linked to Related Parties
Reg. Measure ID	Organization	Regulatory Measure Type	Program	Effective Date	Status