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The Norwalk WPCF involves the following processes prior to discharging clean water into the Norwalk River:

• Headworks/Preliminary Treatment (Mechanical Bar Screens, Main Lift Station, Aerated Grit Chambers);
• Primary Treatment (Primary Clarifiers);
• Secondary Treatment (Aeration tanks, Final Clarifiers, Secondary Lift Station);
• Disinfection (Chlorination and Dechlorination);
• Supplemental Treatment (Wet Weather)

The Norwalk WPCF also handles the solid waste generated during the wastewater treatment process. The final product in the biosolids treatment process is liquid sludge and dewatered cake which are removed to offsite locations for further treatment and disposal. The solids handling processes includes:

• Primary Sludge Thickening using Gravity Thickener Tanks;
• Waste Activated Sludge (WAS) Thickening using Gravity Belt Thickeners;
• Primary and Thickened WAS Blending Tank and Storage;
• Sludge Dewatering using Centrifuges

The Norwalk WPCA continues to commission various projects, studies, and treatment technology evaluations with the important goal of ensuring continuous and adequate wastewater treatment that is also environmentally sustainable and enhances water quality.

The WPCF is staffed twenty-four hours a day, seven days a week, 365 days a year. The WPCF is equipped with a Supervisory Control and Data Acquisition (SCADA) System to monitor and control the whole WPCF operations as well as all the remote pump stations in the entire collection system.

Vehicle owners are required to renew their licenses/registrations every June at a location and date specified by the WPCA.

• Each truck must be inspected and an application filled out by a Sanitarian from the Norwalk Health Department prior to license/registration approval.
• If approved, one (1) septage disposal permit sticker for each vehicle will be issued to the applicant. Each vehicle must display the sticker as long as the license/registration is valid.

Licensed/registered haulers disposing septic tank or cesspool liquid wastes at the Norwalk Septage Receiving Station shall be charged a fee based on volume per load at $100 per 1000 gallons (effective September 10, 2002).

https://portal.ct.gov/DEEP/Water-Regulating-and-Discharges/Industrial-Wastewater/Industrial-Wastewater#Reissuance

Link to Additional Resources

The Connecticut Department of Energy and Environmental Protection (CTDEEP)regulates the discharge of industrial wastewater to the ground water, surface water, and to sewage treatment plants. These discharge limits and requirements for treatment, monitoring and reporting are designed to protect the waters of the state from pollution. Individual permits customized to an applicant and General permits issued to authorize similar activities by one or more applicants are available for industrial waste water discharges. The CTDEEP General permit set terms and conditions for Miscellaneous Industrial Users (MIU) and when complied with, are protective of the environment.

MIU wastewater includes but is not limited to air compressor condensate & blowdown, boiler blowdown, building maintenance wastewater, commercial laundry wastewater, contact cooling &heating water, cutting & grinding wastewater, fire suppression system test water, food processing wastewater, hydrostatic pressure testing wastewater, water treatment wastewater, and vehicle maintenance wastewater.

The WPCA receives and reviews discharge notifications and monitoring reports, and, in conjunction with DEEP, enforces effluent limits and permit conditions of MIU wastewater discharges under the CTDEEP General Permit.