Overview

The City of Rock Hill owns and operates a Publicly Owned Treatment Works (POTW), Manchester Creek Wastewater Treatment Plant (MCWWTP), that collects and treats domestic, commercial and industrial wastewaters generated within City limits and adjacent service areas. Treatment is provided at the MCWWTP in accordance with a National Pollutant Discharge Elimination System (NPDES) permit that is issued by the South Carolina Department of Health and Environmental Control (SCDHEC). The United States Government, through the U.S. Environmental Protection Agency (EPA) has established regulations that require municipal permit holders that receive industrial wastewaters to develop Industrial Pretreatment Programs.

If any IU (Industrial User) is deemed to be an SIU (Significant Industrial User), it is based upon the following criteria being met that is detailed in the City Ordinance:

1. All industrial users subject to categorical pretreatment standards under 40 CFR 403.6 and 40 CFR chapter I, subchapter N; and
2. Any other industrial user that discharges an average of 25,000 gallons per day or more of process wastewater to the city's sewer system (excluding sanitary, non-contact cooling and boiler blowdown wastewater), contributes a process waste stream which makes up five percent or more of the average dry weather hydraulic or organic capacity of the city's treatment plant, or is designated as such by the city on the basis that the industrial user has a reasonable potential for adversely affecting the operation of the city's sewer system or treatment works or for violating any pretreatment standard or requirement (in accordance with 40 CFR 403.8(f)(6)).
3. The city may determine that an industrial user subject to categorical pretreatment standards in subsection (1) of this definition is a non-significant categorical industrial user rather than a significant industrial user when the industrial user meets the conditions under the definition for an NSCIU in section 29-152.
4. Upon finding that an industrial user meeting the criteria in subsection (2) of this definition has no reasonable potential for adversely affecting the operation of the city's sewer system or treatment works or for violating any pretreatment standard or requirement, the city may at any time, on its own initiative or in response to a petition received from an industrial user, and in accordance with 40 CFR 403.8(f)(6), determine that such industrial user is not a significant industrial user.

If the industrial user is not an SIU, but the City determines, for the purpose of apportioning the costs of wastewater treatment, that the discharge of the pollutants should be measured and regulated, an Industrial User Permit may be issued.

Relevant Documents

• Pretreatment Program Industrial User Survey (PDF)