DWQ-2025-004299

INSPECTION SUMMARY and FINDINGS
Permittee: St. George City
Facility: St. George Regional Water Reclamation Facility
Inspection Type: Biosolids Inspection
Permit Number: UTL024686
Start Date and Time: 2:00 pm; April 21, 2025
End Date and Time: 3:00 pm; April 21, 2025
Location: 2176 West 3780 South
St. George, UT 84790
OVERVIEW
Daniel Griffin, with the Division of Water Quality (DWQ) met with Ben Ford, and Eric Richins of St. George Regional Water Reclamation Facility (Facility) to conduct a Biosolids Inspection.
Identification was provided, and the purpose and scope of the inspection were explained.
PERMIT INFORMATION
Discharge
DWQ has issued an UPDES Permit to Saint George City; the permit number is UT0024686. The effective date of the UPDES Permit is August 1, 2020; the expiration date is July 31, 2025.The
Discharge Provisions are included in Part I of the UPDES Permit. The effluent discharges to Virgin River. The permit also contains standards for reuse in Part I. This was not discussed
as part of the inspection.
Biosolids
The permit includes provisions for biosolids in Part III. The Permittee has a Biosolids Program. This was discussed as part of the inspection. Information regarding the discussion can
be found in the Biosolids Section of this report.
Pretreatment
The permit includes provisions for pretreatment requirements.The Permittee has been approved by DWQ to implement an Approved Pretreatment Publicly Owned Treatment Works Program. This
is inspected more thoroughly during pretreatment inspections by DWQ. This was not discussed as part of the inspection.
Wastewater Collection System
The Permittee owns, maintains and operates a collection system. Requirements regarding overseeing the collection system are included in the General Permit issued by DWQ Permit No. UTG580000.
Additional information regarding this permit can be found at the following website:
https://deq.utah.gov/water-quality/utah-sewer-management-program-usmp
The effective date of the Permit is 1 April 2023; the expiration date is 31 March 2028. The permit requires the Permittee to reapply 30 days before the permit expires.This was not discussed
as part of the inspection.
INSPECTION
The Facility is a wastewater treatment facility located in St. George Utah. The Facility serves the cities of St. George, Ivins, Santa Clara, and Washington City. The inspector met with
Facility representatives at the Facility office and proceeded on to site walkthrough of the solids processing system. Following the walkthrough, the Biosolids Checklist.
Wastewater enters the facility via four 88-inch screw pumps, which pump the influent into the headworks building, where it is screened. From the headworks, wastewater flows to the bioselector,
to the anoxic basin, then to one of four aeration basins. Wastewater then flows to one of eight clarifiers. Wastewater that is discharged out of Outfall 001 is treated via ultraviolet
disinfection, and is then discharged through a cascade aeration system, and through Outfall 001 to a ditch, then to the Virgin River.
Wastewater that is discharged out of Outfall 001R flows from the clarifiers to the Reuse Disinfection Building, where it is treated with liquid chlorine, and is discharged out ofOutfall
001R to a reuse pipeline.
The solids are stabilized in the oxidation ditches with mean cell residence time of approximately 45 days. They solids are separated from the wastes water in the final clarifiers where
the waste activated sludge is sent off to the sludge thickeners. From here they are sent to digesters that are used as solids holding tanks. Then the solids go to the centrifuges for
dewatering to 15% to 20% solids. The dewatered solidsis then sent off to the local landfill for disposal
During the inspection, one of the centrifuges was down for servicing. The other two had previously been serviced and were back in operation.
During the inspection the facility noted they are working on plans to replace some clarifiers to expand and improve wastewater treatment capacity. The facility also noted that they planned
to increase expand the dewatering capacity along with the wastewater treatment capacity.
DEFICIENCIES
There were no deficiencies identified during the inspection.
RECOMMENDATIONS
There are no recommendations identified during the inspection.
PHOTO LOG
Photo No. 01
Date: April 21, 2025
Description: Inservice Centrifuges
Photo No. 02
Date: April 21, 2025
Description: Out of service centrifuge
[References to other D2 documents that are included or noted as part of the report
DWQ-2023-125139
Letter DWQ-2023-125159]
[Change the font for the footnotes to ensure the facility can adequately see the references utilized in the report.]