Attachment 4: Order No. as amended

CALIFORNIA REGIONAL WATER QUALITY CONTROL BOARD

SAN DIEGO REGION

2375 Northside Drive. Suite 100, San Diego, CA 92108
(619) 516-1990 - Fax (619) 516-1994
https://www.waterboards.ca.gov/sandiego/

ORDER NO. R9-2021-0001

AS AMENDED BY ORDER NO. R9-2023-0009

AS AMENDED BY ORDER NO. R9-2026-0005

NPDES NO. CA0108928

WASTE DISCHARGE REQUIREMENTS

FOR THE UNITED STATES SECTION OF THE

INTERNATIONAL BOUNDARY AND WATER COMMISSION

SOUTH BAY INTERNATIONAL WASTEWATER TREATMENT PLANT

DISCHARGE TO THE PACIFIC OCEAN

THROUGH THE SOUTH BAY OCEAN OUTFALL

The following Discharger is subject to waste discharge requirements (WDRs) set forth in this Order:
Discharger
Name of Facility
Facility Address

United States Section of the International Boundary and Water Commission (USIBWC)
South Bay International Wastewater Treatment Plant
South Bay Ocean Outfall
2995 Clearwater Way
San Diego, CA 92154
San Diego County
Table 1. Discharge Location

Discharge
Point

Effluent Description

Discharge Point
Latitude (North)

Discharge Point
Longitude (West)

Receiving
Water

Advanced primary- and
secondary-treated
wastewater (blended)

32º 32’ 16” N

117º 11’ 00” W

Pacific
Ocean

This Order was adopted on:
May 12, 2021
This Order originally became effective on:
July 1, 2021
This Order as amended by Order No. R9-2023-0009 became effective on: March 8, 2023 This Order as amended by Order No. R9-2026-0005 became effective on: April 8, 2026 This Order shall expire on:
June 30, 2026

U.S. International Boundary and
Water Commission
South Bay International Wastewater
Treatment Plant

Order No. R9-2021-0001
As Amended by Order No. R9-2023-0009
As Amended by Order No. R9-2026-0005

NPDES No. CA0108928

The Discharger shall file a Report of Waste Discharge (ROWD) as an application for reissuance of WDRs in accordance with title 23, California Code of Regulations (CCRs), and an application for reissuance of a National Pollutant Discharge Elimination System (NPDES) permit no later than 180 days prior to the Order expiration date. The United States Environmental Protection Agency (USEPA), and the California Regional Water Quality Control Board, San Diego Region (San Diego Water Board) have classified the discharge as a Major Discharge.
I, David W. Gibson, Executive Officer, do hereby certify that this Order with all attachments is a full, true, and correct copy of the Order adopted by the San Diego Water Board on the date indicated above and amended on April 8, 2026.