(a) No person or municipality shall initiate, create, originate or maintain any discharge of water, substance or material into the waters of the state without a permit for such discharge issued by the commissioner. Any person who initiated, created or originated a discharge prior to May 1, 1967, and any municipality which initiated, created or originated a discharge prior to April 10, 1973, for which a permit has not been issued pursuant to this section, shall submit an application for a permit for such discharge on or before July 1, 1987. Application for a permit shall be on a form prescribed by the commissioner, shall include such information as the commissioner may require and shall be accompanied by a fee of twenty-five per cent more than the amount established in regulations in effect on July 1, 1990. On and after July 1, 1991, such fees shall be as prescribed by regulations adopted by the commissioner in accordance with chapter 54. The commissioner shall not issue or renew a permit unless such issuance or renewal is consistent with the provisions of the federal Clean Water Act (33 USC 1251 et seq.).

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(b) The commissioner, at least thirty days before approving or denying a permit application for a discharge, shall publish once in a newspaper having a substantial circulation in the affected area notice of (1) the name of the applicant; (2) the location, volume, frequency and nature of the discharge; (3) the tentative decision on the application, and (4) additional information the commissioner deems necessary to comply with the federal Clean Water Act (33 USC 1251 et seq.). There shall be a comment period following the public notice during which period interested persons and municipalities may submit written comments. After the comment period, the commissioner shall make a final determination either that (A) such discharge would not cause pollution of any of the waters of the state, in which case he shall issue a permit for such discharge, or (B) after giving due regard to any proposed system to treat the discharge, that such discharge would cause pollution of any of the waters of the state, in which case he shall deny the application and notify the applicant of such denial and the reasons therefor, or (C) the proposed system to treat such discharge will protect the waters of the state from pollution, in which case he shall, except as provided pursuant to subsection (j) of this section, require the applicant to submit plans and specifications and such other information as he may require and shall impose such additional conditions as may be required to protect such water, and if the commissioner finds that the proposed system to treat the discharge, as described by the plans and specifications or such other information as may be required by the commissioner pursuant to subsection (j) of this section, will protect the waters of the state from pollution, he shall notify the applicant of his approval and, when such applicant has installed such system, in full compliance with the approval thereof, the commissioner shall issue a permit for such discharge, or (D) the proposed system to treat such discharge, as described by the plans and specifications, will not protect the waters of the state, in which case he shall promptly notify the applicant that its application is denied and the reasons therefor. No permit shall be issued for an alternative on-site sewage treatment system, as defined in the Public Health Code, in a drinking water supply watershed unless the commissioner determines that (i) such system is the only feasible solution to an existing pollution problem and that the proposed system capacity does not exceed the capacity of the failed on-site system, or (ii) such system is for the expansion of an existing municipal or public school project or for new construction of a municipal or public school project on an existing municipal or public school site, in a municipality in which a majority of the land is located within a drinking water supply watershed. The commissioner shall, by regulations adopted in accordance with the provisions of chapter 54, establish procedures, criteria and standards as appropriate for determining if (I) a discharge would cause pollution to the waters of the state, and (II) a treatment system is adequate to protect the waters of the state from pollution. Such procedures, criteria and standards may include schedules of activities, prohibitions of practices, operating and maintenance procedures, management practices and other measures to prevent or reduce pollution of the waters of the state, provided the commissioner in adopting such procedures, criteria and standards shall consider best management practices. The regulations shall specify the circumstances under which procedures, criteria and standards for activities other than treatment will be required. For the purposes of this section, “best management practices” means those practices which reduce the discharge of waste into the waters of the state and which have been determined by the commissioner to be acceptable based on, but not limited to, technical, economic and institutional feasibility. Any applicant, or in the case of a permit issued pursuant to the federal Water Pollution Control Act, any person or municipality, who is aggrieved by a decision of the commissioner where an application has not been given a public hearing shall have the right to a hearing and an appeal therefrom in the same manner as provided in sections 22a-436 and 22a-437. Any applicant, or in the case of a permit issued pursuant to the federal Water Pollution Control Act, any person or municipality, who is aggrieved by a decision of the commissioner where an application has been given a public hearing shall have the right to appeal as provided in section 22a-437. The commissioner may, by regulation, exempt certain categories, types or sizes of discharge from the requirement for notice prior to approving or denying the application if such category, type or size of discharge is not likely to cause substantial pollution. The commissioner may hold a public hearing prior to approving or denying any application if in his discretion the public interest will be best served thereby, and he shall hold a hearing upon receipt of a petition signed by at least twenty-five persons. Notice of such hearing shall be published at least thirty days before the hearing in a newspaper having a substantial circulation in the area affected.

(c) The permits issued pursuant to this section shall be for a period not to exceed five years, except that any such permit shall be subject to the provisions of section 22a-431. Such permits: (1) Shall specify the manner, nature and volume of discharge; (2) shall require proper operation and maintenance of any pollution abatement facility required by such permit; (3) may be renewable for periods not to exceed five years each in accordance with procedures and requirements established by the commissioner; and (4) shall be subject to such other requirements and restrictions as the commissioner deems necessary to comply fully with the purposes of this chapter, the federal Water Pollution Control Act and the federal Safe Drinking Water Act. An application for a renewal of a permit which expires after January 1, 1985, shall be filed with the commissioner at least one hundred eighty days before the expiration of such permit. The commissioner, at least thirty days before approving or denying an application for renewal of a permit, shall publish once in a newspaper having substantial circulation in the area affected, notice of (A) the name of the applicant; (B) the location, volume, frequency and nature of the discharge; (C) the tentative decision on the application; and (D) such additional information the commissioner deems necessary to comply with the federal Clean Water Act (33 USC 1251 et seq.). There shall be a comment period following the public notice during which period interested persons and municipalities may submit written comments. After the comment period, the commissioner shall make a final determination that (i) continuance of the existing discharge would not cause pollution of the waters of the state, in which case he shall renew the permit for such discharge, (ii) continuance of the existing system to treat the discharge would protect the waters of the state from pollution, in which case he shall renew a permit for such discharge, (iii) the continuance of the existing system to treat the discharge, even with modifications, would not protect the waters of the state from pollution, in which case he shall promptly notify the applicant that its application is denied and the reasons therefor, or (iv) modification of the existing system or installation of a new system would protect the waters of the state from pollution, in which case he shall renew the permit for such discharge. Such renewed permit may include a schedule for the completion of the modification or installation to allow additional time for compliance with the final effluent limitations in the renewed permit provided (I) continuance of the activity producing the discharge is in the public interest; (II) the interim effluent limitations in the renewed permit are no less stringent than the effluent limitations in the previous permit; and (III) the schedule would not be inconsistent with the federal Water Pollution Control Act. No permit shall be renewed unless the commissioner determines that the treatment system adequately protects the waters of the state from pollution. Any applicant, or in the case of a permit issued pursuant to the federal Water Pollution Control Act, any person or municipality, who is aggrieved by a decision of the commissioner where an application for a renewal has not been given a public hearing shall have the right to a hearing and an appeal therefrom in the same manner as provided in sections 22a-436 and 22a-437. Any applicant, or in the case of a permit issued pursuant to the federal Water Pollution Control Act, any person or municipality, who is aggrieved by a decision of the commissioner where an application for a renewal has been given a public hearing shall have the right to appeal as provided in section 22a-437. Any category, type or size of discharge that is exempt from the requirement of notice pursuant to subsection (b) of this section for the approval or denial of a permit shall be exempt from notice for approval or denial of a renewal of such permit. The commissioner may hold a public hearing prior to approving or denying an application for a renewal if in his discretion the public interest will be best served thereby, and he shall hold a hearing upon receipt of a petition signed by at least twenty-five persons. Notice of such hearing shall be published at least thirty days before the hearing in a newspaper having a substantial circulation in the area affected.

(d) If the commissioner finds that any person or municipality has initiated, created or originated or is maintaining any discharge into the waters of the state without a permit as required in subsection (a) of this section, or in violation of such a permit, the commissioner may issue an order to abate pollution which shall include a time schedule for the accomplishment of the necessary steps leading to the abatement of such pollution, or notwithstanding any request for a hearing pursuant to section 22a-436 or the pendency of an appeal therefrom, the commissioner may request the Attorney General to bring an action in the superior court for the judicial district of Hartford (1) to enjoin such discharge by such person or municipality until the person or municipality has received a permit from the commissioner or has complied with a permit which the commissioner has issued pursuant to this section, or (2) for injunctive relief to remediate the effects of such discharge. Any such action brought by the Attorney General shall have precedence in the order of trial as provided in section 52-191.

(e) When the commissioner determines that any person or municipality has complied with an order issued pursuant to section 22a-428, 22a-431 or 22a-432, he may issue a permit which shall thereafter be deemed equivalent to a permit issued under subsection (b) of this section, provided a public hearing shall not be required prior to issuing such permit unless required by the federal Water Pollution Control Act and the federal Safe Drinking Water Act.

(f) The commissioner may, by regulation, establish and define categories of discharges, including but not limited to, residential swimming pools, small community sewerage systems, household and small commercial disposal systems and clean water discharges, for which he may delegate authority to any other state agency, water pollution control authority, municipal building official or municipal or district director of health to issue permits or approvals in accordance with this section or to issue orders pursuant to sections 22a-428, 22a-431, 22a-432 and 22a-436. In establishing such categories the commissioner shall consider (1) whether each discharge in such category, because of size and character, is likely to cause significant pollution to the waters of the state; (2) whether knowledge and training concerning disposal systems for each discharge in such category is within the expertise of such agency, authority, official or director; (3) whether the source of each discharge in such category is likely to be within the jurisdiction of such agency, authority, official or director for other matters. The commissioner shall establish, by regulation, minimum requirements for disposal systems for discharges in such categories. Any permit denied or order issued by any such agency, authority, official or director shall be subject to hearing and appeal in the manner provided in sections 22a-436 and 22a-437, provided such agency, authority, official or director has been duly delegated authority by the commissioner pursuant to this subsection. Any permit granted by any such agency, authority, official or director to which the commissioner has delegated authority pursuant to this subsection shall thereafter be deemed equivalent to a permit issued under subsection (b) of this section.

(g) The commissioner shall, by regulation adopted prior to October 1, 1977, establish and define categories of discharges that constitute household and small commercial subsurface sewage disposal systems for which the commissioner shall delegate to the Commissioner of Public Health the authority to issue permits or approvals and to hold public hearings in accordance with this section, on and after said date. Not later than July 1, 2025, the commissioner shall amend such regulations to establish and define categories of discharges that constitute small community sewerage systems and household and small commercial subsurface sewage disposal systems. The Commissioner of Public Health shall, pursuant to section 19a-36, establish minimum requirements for small community sewerage systems and household and small commercial subsurface sewage disposal systems and procedures for the issuance of such permits or approvals by the local director of health or a sanitarian registered pursuant to chapter 395. As used in this subsection, small community sewerage systems and household and small commercial disposal systems shall include those subsurface sewage disposal systems with a capacity of ten thousand gallons per day or less. Notwithstanding any provision of the general statutes (1) the regulations adopted by the commissioner pursuant to this subsection that are in effect as of July 1, 2017, shall apply to household and small commercial subsurface sewage disposal systems with a capacity of seven thousand five hundred gallons per day or less, and (2) the regulations adopted by the commissioner pursuant to this subsection that are in effect as of July 1, 2025, shall apply to small community sewerage systems, household systems and small commercial subsurface sewerage disposal systems with a capacity of ten thousand gallons per day or less. Any permit denied by the Commissioner of Public Health, or a director of health or registered sanitarian shall be subject to hearing and appeal in the manner provided in section 19a-229. Any permit granted by the Commissioner of Public Health, or a director of health or registered sanitarian on or after October 1, 1977, shall be deemed equivalent to a permit issued under subsection (b) of this section.

(h) Each person holding a permit to discharge into the waters of the state shall pay an annual fee of twenty-five per cent more than the fee established by regulations in effect on July 1, 1990. The commissioner may adopt regulations, in accordance with the provisions of chapter 54, to prescribe the amount of the fees required pursuant to this section. Upon the adoption of such regulations, the fees required by this section shall be as prescribed in such regulations.

(i) (1) Notwithstanding the provisions of subsection (c) of this section, the commissioner may issue a permit for a discharge to waters of the state from any solid waste disposal area, as defined in section 22a-207, or from any subsurface sewage disposal system for a period not to exceed thirty years, and for any other discharge for a period not to exceed ten years, provided such permit is not inconsistent with the federal Water Pollution Control Act. Any permit issued pursuant to this subsection shall be subject to the provisions of section 22a-431. For the purpose of this subsection, “subsurface sewage disposal system” means a system consisting of a house or collection sewer, a septic tank followed by a leaching system, any necessary pumps or siphons and any groundwater control system on which the operation of the leaching system is dependent.

(2) Permits for the categories of discharge for which ten-year and thirty-year permits may be issued pursuant to subdivision (1) of this subsection which are in effect on October 1, 1996, shall not expire until five years or twenty-five years, respectively, after the expiration date stated in the permit, provided such extension is not inconsistent with the federal Water Pollution Control Act and further provided no such permit may be valid for a period greater than thirty years and further provided, the commissioner may, no earlier than two hundred seventy days before the expiration date stated in the permit, send notice to the permittee that an application for permit renewal must be submitted not later than one hundred eighty days prior to the expiration date stated in the permit. If a timely and sufficient application for renewal is submitted within such time, the permit shall be continued in accordance with subsection (b) of section 4-182. If a timely and sufficient application is not submitted within such time, the permit shall expire unless such permit is extended pursuant to section 22a-6j. Nothing in this section shall affect the commissioner’s authority to take action under this chapter, including but not limited to, issuance of orders under section 22a-431.

(j) (1) The commissioner may exempt persons who or municipalities which apply for permits for the following discharges from the requirement to submit plans and specifications under subsection (b) of this section:

(A) A discharge from a new treatment or disposal system which system is substantially the same as a system that the applicant is operating in compliance with a permit for said system issued by the commissioner;

(B) The discharge is described in a general permit issued by the commissioner pursuant to section 22a-430b;

(C) The discharge is from a system, the purpose of which, as determined by the commissioner, is not to treat any toxic or hazardous substances; or

(D) The discharge is exempt from public notice under subsection (b) of this section and regulations adopted thereunder.

(2) The commissioner shall adopt regulations not later than February 1, 2015, in accordance with the provisions of chapter 54, to establish other categories of discharges which may be exempted from the requirement to submit plans and specifications under subsection (b) of this section. Such regulations may include, but not be limited to, the following: (A) Minimum standards for the design and operation of treatment systems for such discharges; and (B) requirements for submission of information concerning such discharges.

(k) The commissioner shall not deny a permit under this section if the basis for such denial is a determination by the commissioner that the proposed activity for which application has been made is inconsistent with the state plan of conservation and development adopted under part I of chapter 297.