Prado Basin Management Zone

2026 303(d) list Waterbody ID CAW8012100019991014103600 Wetland, Freshwater Region 8 · Santa Ana

At a glance

2026 listing Evidence: State-published: On the 2026 303(d) list · 1 Appendix A decision; Category 5: a TMDL is required; What a listing means
Pollutants and stressors: 1 pollutant in 1 Appendix A category; Other Cause (1); Listing decisions
TMDL information Evidence: State-published: 1 decision with a TMDL requirement status; Status codes as published: 5A; TMDL details
Regional Water Board: Region 8 · Santa Ana; Wetland, Freshwater · Map
Industrial stormwater facilities: 1 report it as their receiving water Evidence: identification corroborated; 349 within 1 km Evidence: geographic proximity; Neither count establishes a discharge · Facilities

What a 303(d) listing means

The Clean Water Act section 303(d) list names waters that do not meet water quality standards for one or more pollutants or stressors. California publishes it in the Integrated Report; this page shows the 2026 decisions from Appendix A as published.

A listing describes the condition of the waterbody. It does not identify which sources cause the impairment, and it does not by itself place a requirement on any particular facility.
Listed waters do not all have the same status. The Integrated Report category says how an impairment is being addressed: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant. This waterbody's decisions are in category 5.
TMDL requirement status values (such as 5A or 5B) are shown exactly as published in Appendix A.

2026 listing status Evidence: State-published

On the 2026 303(d) list: Yes
Appendix A decisions: 1
Integrated Report category: 5 (a TMDL is required)
Listing cycle: 2026
State Board adoption: 2026-02-03 (Resolution 2026-0005)
USEPA approval: not confirmed — submittal letter to USEPA published; no approval found on the report page (checked 2026-10-22)
Regional Water Board: 8 — Santa Ana

Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. A listing describes the condition of this waterbody, not of any facility.

Location

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Open this area on the statewide map · Browse impaired waters

Listing decisions and pollutants Evidence: State-published

Grouped by the Pollutant Category published in Appendix A. Pollutant names, categories and decisions are exactly as published.

Other Cause (1 decision)

Other Cause: Appendix A decisions
Pollutant	Pollutant category	Category	Final listing decision	Decision status	Sources	Decision ID
pH	Other Cause	5	List on 303(d) list (TMDL required list)	Original	A Source Unknown	80650

TMDL information Evidence: State-published

TMDL information published for this waterbody
Pollutant	TMDL requirement status	TMDL project	Priority	USEPA approval of TMDL	Expected attainment
pH	5A	—	Low	—	—

This is TMDL information for the waterbody. It does not establish that a TMDL applies to any particular facility. Facility-specific TMDL requirements recorded in SMARTS appear on facility pages and are not linked to this waterbody until reviewed.

HUC12 watersheds

Published with the listing Evidence: publisher-reported

Lake Norconian-Temescal Wash 180702030606
Middle Chino Creek 180702030703
Lower Cucamonga Creek 180702030705
Lower Chino Creek 180702030706
East Etiwanda Creek-Santa Ana River 180702030804

Overlapping the waterbody's shape Evidence: spatial

Lake Norconian-Temescal Wash 180702030606 also published
Middle Chino Creek 180702030703 also published
Lower Cucamonga Creek 180702030705 also published
Lower Chino Creek 180702030706 also published
East Etiwanda Creek-Santa Ana River 180702030804 also published
Aliso Creek-Santa Ana River 180702031001

Industrial stormwater facilities

Evidence: identification corroborated

Shows: the facility named this waterbody as its receiving water in SMARTS, and the name and the facility's location are consistent with it. Does not establish: a discharge pathway, a discharge of any pollutant, or a cause of the listing.

Evidence: geographic proximity

Shows: the facility's reported location is within 1 km of the waterbody's mapped shape. Does not establish: that the facility discharges to this waterbody, or any other relationship.

Report this waterbody as their receiving water Evidence: identification corroborated

Facilities whose reported receiving water is identified as this waterbody
Facility	WDID	Status	Distance from reported location	Map
aerosport fuel cells LLC	8 36I030616	Terminated	2.3 km	map

Receiving water reported by facility — waterbody identification corroborated by geographic evidence. 1 facility.

Within 1 km of a facility's reported location Evidence: geographic proximity

Spatial proximity only; discharge pathway not established. Being near this waterbody does not mean a facility discharges to it.

Facilities whose reported location is within 1 km of this waterbody
Facility	WDID	Status	Map
WCAC Operating Company California LLC	8 33I001186	Terminated	map
Corona Municipal Airport	8 33I001303	Active	map
Syann Dairy - 14950 River Rd	8 33I005304	Terminated	map
Dairy Farmers Of America	8 33I005553	Terminated	map
Certified Grocers	8 33I006758	Terminated	map
Golden Cheese Co CA	8 33I007117	Terminated	map
Blue Ribbon Nursery & Land	8 33I010893	Terminated	map
Fiskars Consumer Prod Inc	8 33I015786	Terminated	map
Merit Aluminum Corp	8 33I017102	Active	map
Syroco, Inc.	8 33I019064	Terminated	map
Talco Plastics Inc	8 33I019364	Active	map
RW Lyall Co	8 33I020417	Terminated	map
Fleetwood Aluminum Products	8 33I020494	Terminated	map
Thoro Packaging	8 33I022359	Active	map
Kobelco Compressors America Inc	8 33I023488	Active	map
Noranco	8 33I023912	Terminated	map
PTI Sand and Gravel Inc	8 33I024588	Terminated	map
Water Reclamation Facility No 1	8 33I026688	Active	map
MiTek USA INC	8 33I027650	Terminated	map
PANROSA ENTERPRISES INC	8 33I028255	Terminated	map
AMRO FABRICATING	8 33I030410	Active	map
PTI Sand and Gravel	8 33IN602452	Undetermined	map
Viramontes Express	8 33IN603669	NOI Required	map
Red Star Fertilizer Company	8 33IN603905	NOI Required	map
PTI Sand and Gravel Inc	8 33NEC000029	Terminated	map
Natures Specialties LLC	8 33NEC005405	Active	map
MCCOY DOORS & MORE	8 33NEC005961	Active	map
ARIS helicopters	8 33NEC006569	Active	map
Stark Venture United	8 33NEC007031	Active	map
Hughes Aerospace	8 33NEC007468	Active	map
Procraft Aviation Incorporated	8 33NEC007701	Active	map
Trimedyne Inc Corona	8 33NEC008793	Active	map
Carpenter & Paterson	8 33NEC009385	Active	map
CMA Company LLC	8 33NEC009445	Active	map
Com Tech Mechanical Solutions Inc	8 33NEC009969	Active	map
Corona	8 33NEC011055	Terminated	map
Laltitude LLC	8 33NEC013096	Active	map
VERIFLUX SOLUTION INC	8 33NEC015286	Active	map
Liberty Ranch	8 36I000052	Terminated	map
Flamingo Dairy	8 36I000223	Terminated	map
Henry Vander Poel 2 Dairy	8 36I005279	Terminated	map
Stueve Dairy 6	8 36I005677	Terminated	map
Scotts Hyponex Growing Media Plant Chino	8 36I011337	Terminated	map
Regional Solids Handling Facility No 2	8 36I019200	Terminated	map
Red Star Fertilizer Co	8 36I027943	Active	map
Viramontes Express Inc	8 36I027944	Active	map
Solo Cup Operating Corporation	8 36NEC006713	Active	map
u pathfinder inc	8 36NEC014198	Active	map
FLOW X INTERNATIONAL USA INC	8 36NEC015981	Active	map
Motivational Marketing LLC	8 36NEC016345	Active	map

349 facilities, nearest first. Page 1 of 7: next

Sources and provenance

Sources behind this page
Information	Source	Retrieved
Watershed Boundary Dataset HU2 GeoPackages 15, 16, 18 (WBDHU12)	USGS	2026-10-22
2026 California Integrated Report, Appendix A: 2026 303(d) List (final)	SWRCB	2026-10-22
Final_2026_Rivers_and_Streams + Final_2026_Lakes_and_Reservoirs (FeatureServer 0)	SWRCB GIS	2026-10-22
SMARTS TMDL requirements	SMARTS	2026-10-21

Relationships computed 2026-10-22 (facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1).

Integrated Report categories: 5, a TMDL is required; 4a, addressed by a USEPA-approved TMDL; 4b, addressed by other pollution control requirements; 4c, impairment not caused by a pollutant.