Amends GS 143-215.1C(b), expanding upon the required acts of an owner or operator of any wastewater collection or treatment works which primarily collects or treats municipal or domestic wastewater and is permittee, to require, within 24 hours of discharging 1,000 gallons or more of untreated wastewater to the surfaces waters of the State: (1) providing notice to the local health director for the county in which the discharge occurs; and (2) providing notice to customers of the wastewater collection or treatment works or other interested parties by posting notice on its website for a period of 12 months from the last date of discharge (currently only requires issuance of a press release).  Expands upon the required acts of an owner or operator of any wastewater collection or treatment works which primarily collects or treats municipal or domestic wastewater and is permittee, to require, upon discharging 15,000 gallons or more of untreated wastewater to the surfaces waters of the State: (1) providing notice to the local health director for each county downstream from the point of discharge that is significantly affected by the discharge, as determined by the Secretary of the Department of Environmental Quality (Secretary), within 24 hours of the Secretary's determination in the manner specified; and (2) providing notice on or with the customer's wastewater bill within 60 days following discharge, as specified. Provides that these requirements are in addition to the notice requirements upon discharge of 1,000 gallons or more of untreated wastewater, as amended above.

Makes identical changes to the notice requirements of owners of operators of any wastewater collection or treatment works under subsection (c) to mirror those under subsection (b), for systems other than those that primarily collect or treat municipal or domestic wastewater. 

Enacts new subsection (d) to require notice to customers by prepaid mail or email for those who opt into a discharge notification mailing list. Requires owners or operators subject to the notice requirements of subsection (b) to inform customers of the opportunity to sign up for an emailed notification, at least twice per year. Requires maintaining records of notifications for 36 months from the date of notice. 

Provides authority for the Secretary to extend the time period for making, issuing, or publishing reports and follow-up reports required by the statute during extraordinary circumstances. 

Effective October 1, 2021.