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SIU - FAQsBack to SIU Main PageWhen is an SIU Permit Needed?An SIU Permit is required to be obtained for any wastewater to be discharged into a publicly owned sewage treatment plant by a Significant Indirect User prior to beginning discharge. An existing discharger which becomes aware that it is a Significant Indirect User must apply for a permit immediately. An existing or proposed discharger planning to modify activities in such a way as to become a Significant Indirect User must apply at least 180 days prior to the proposed initiation of the relevant discharge, and cannot begin the discharge until the permit is issued.If you discharge to a non-delegated agency and are not sure if you are an SIU, complete an indirect discharger questionnaire in ADOBE Acrobat .pdf format). or e-mail Gary Torres at gtorres@dep.state.nj.us. Note that some non-delegated POTWs require their users to obtain "permits". A permit, contract or other agreement from a non-delegated POTW is not an SIU permit and does not eliminate any requirement to obtain or hold an SIU permit. How do I apply for an SIU Permit?An SIU discharging to a Delegated Local Agency should contact that agency regarding forms and procedures. An SIU discharging to any other New Jersey sewage treatment plant must file an application on specific forms ( available in ADOBE Acrobat .pdf format) directly with the Department of Environmental Protection.What else must I file?A user must file a Baseline Report as required by 40 CFR 403.12(b) within 180 days of promulgation of a Federal Categorical Standard applicable to one or more of its activities; or prior to commencing any such activity. An SIU permit or modification of an existing permit may be required prior to discharge. Optional forms are available in ADOBE Acrobat .pdf format to assist non-delegated POTW users in determining applicability and filing Baseline Reports. Which local agency serves my area?We need some information to tell you that...What is in an SIU Permit?A Department - issued SIU permit will contain limitations and pretreatment standards and related requirements based upon Federal and State laws and regulations. Additional information is found in N.J.A.C. 7:14A-21, in EPA and DEP basis documents, and in the "Technical Manual For Division of Water Quality Bureau of Pretreatment and Residuals NJPDES/SIU Permit".What is a control authority?A Control Authority is the agency responsible for, among other things, issuance of SIU permits. In particular, the Control Authority is either (1) a Delegated Local Agency operating the sewage treatment plant receiving the discharge or (2) for discharges into sewage treatment plants not operated by any Delegated Local Agency, the Department of Environmental Protection.
Which Control Authority serves my location?look it up...
What is a Significant Indirect User?Relevant definitions are found in N.J.A.C. 7:14A-1.2 within the NJPDES Regulations ( available as ADOBE Acrobat .pdf), including the following:"Significant indirect user"* or "SIU" means... 1. Any user in the State including, but not limited to, any significant industrial user* as defined in 40 CFR 403.3(t) but excluding municipal collection systems, who discharges wastewater into a local agency where: i. The user is subject to Categorical Pretreatment Standards under 40 CFR 403.6 and 40 CFR Chapter I, Subchapter N;ii. The user's average volume of process wastewater** exceeds 25,000 gallons per day; iii. The amount of BOD, COD or Suspended Solids in the industrial process wastewater discharge exceeds the mass equivalent of 25,000 gallons per day of the domestic waste of the affected local agency; iv. The volume of industrial process wastewater in the discharge exceeds five percent or more of the average daily dry weather flow of the local agency; v. The user's discharge of process wastewater contributes, five percent or more of the daily mass loading of any of the pollutants listed in N.J.A.C. 7:14A-4, Appendix A Tables II through V; vi. The user is designated as an SIU by the control authority on the basis that the user has a reasonable potential for adversely affecting the local agency's operation;vii. The user is designated as an SIU by the control authority on the basis that the user has been in violation of any Federal, State, or local pretreatment standard or requirement, including, but not limited to, significant noncompliance as defined in 40 CFR 403.8(f)(2)(vii); or viii. The control authority determines it would be consistent with the intent of the Pretreatment Act or State Act to require a permit*** for the indirect user; and 2. Any user in areas of the State in which the Department is the control authority where:i. The user is determined to be a hazardous waste facility that received a permit in accordance with N.J.A.C. 7:26-12; ii. The user's discharge consists of landfill leachate, which is either pure, treated, or diluted; or iii. The user's discharge consists of 25,000 gallons per day or more of process wastewater and/or polluted ground water which is pumped from the ground in order to decontaminate an aquifer... Notes on the definition of SIU *Historically, the terms "Significant Indirect User" and "Significant Industrial User" have been used interchangeably. EPA defines "Significant Industrial User" in 40 CFR 403 ( available in ADOBE Acrobat format).**For this purpose, process wastewater includes any wastewater generated by a commercial or industrial activity and any watewater which comes in contact with it before it enters the public sanitary or combined sewers or POTW treatment works. It does not include domestic sanitary wastewater or non-contact cooling water reaching public sewers through a separate sewer connection. ***Some delegated POTWs require additional classes of users to obtain permits.
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