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

Loading the waterbody shape…

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	Distance	Map
Zep Inc	8 33NEC003622	Active	663 m	map
HDK PLASTIC FACTORY LTD USA	8 36NEC014676	Active	666 m	map
EVOLUTION ELECTRIC VEHICLES INC	8 36NEC015504	Active	666 m	map
JF GLOBAL SUPPLY CHAIN CO	8 33NEC016214	Active	667 m	map
M S Industrial Sheet Metal	8 33I003871	Terminated	679 m	map
Ms Industrial Sheet Metal Co	8 33I013299	Terminated	679 m	map
MV Transportation Div 581	8 33NEC004774	Active	682 m	map
DK ENGINEERING	8 36NEC009610	Active	682 m	map
Essential Flavors & Fragrances Inc	8 33NEC009061	Active	683 m	map
T&T Enterprises Inc	8 33NEC004372	Active	685 m	map
Nord Gear Corporation	8 33NEC003085	Terminated	686 m	map
Advanced Paper Forming	8 33NEC006469	Active	688 m	map
Signarama Corona	8 33NEC012348	Active	689 m	map
I Q Nut & Bolt	8 33NEC006052	Active	692 m	map
DECRA Metal Roofing	8 33NEC006524	Terminated	695 m	map
Do It American MFG Company LLC	8 33NEC015290	Active	696 m	map
Circor Aerospace	8 33I011050	Active	700 m	map
Paragon Tactical Incorporated	8 33NEC004399	Terminated	703 m	map
Kobelco Compressors America Inc	8 33I022567	Terminated	705 m	map
C M Spring Engineering Co Inc	8 36NEC008126	Active	705 m	map
Koda International Trading Corporation	8 36NEC015556	Active	715 m	map
Storytellers Brewery and Meet House LLC	8 33NEC007528	Active	718 m	map
IEUA Telephone Ave	8 36I005873	Terminated	719 m	map
Quick Crete Products Corp	8 33I021144	Active	737 m	map
Phoenix motor Sports inc	8 33NEC006810	Active	737 m	map
Diversified Aerospace Finishing	8 33NEC010007	Terminated	742 m	map
Skyland Ale Works	8 33NEC000794	Terminated	747 m	map
Win Soon Inc DBA EPOCA	8 33NEC014935	Active	747 m	map
CA Institution For Men	8 36I005625	Terminated	759 m	map
Watson Building 1	8 33NEC000203	Terminated	760 m	map
US Merchants	8 33NEC011488	Active	766 m	map
Universal Forest Prod Inc	8 33I013209	Terminated	771 m	map
OCPP	8 33NEC007238	Active	773 m	map
Bwd Automotive Corp	8 33I002565	Terminated	777 m	map
John Robbins Inc	8 33NEC006305	Terminated	778 m	map
WestRock CP LLC	8 33I023232	Active	778 m	map
Home	8 33NNA001936	No Action Required	779 m	map
Arvinyl Laminates LP	8 33I011695	Terminated	779 m	map
FlashCo LP	8 33I031600	Active	779 m	map
R&B Artistic Iron Inc dba Artistic Iron	8 33IN607695	Terminated	780 m	map
R&B Artistic Iron Inc dba Artistic Iron	8 33NEC012234	Active	780 m	map
Do It American MFG Company LLC	8 33IN608144	NOI Required	780 m	map
Do It American MFG Company LLC	8 33NEC015047	Active	781 m	map
Tech Recovery Solutions LLC	8 33NEC016399	Active	784 m	map
Boone Int Inc	8 33I017100	Terminated	785 m	map
DART INTERNATIONAL	8 33I028716	Terminated	789 m	map
Skyland Ale Works	8 33NEC003848	Active	791 m	map
R & J Albers Dairy	8 36I000188	Terminated	791 m	map
R & J Albers Dairy	8 36I005431	Terminated	791 m	map
Jackman Machining	8 33NEC006022	Terminated	812 m	map

349 facilities, nearest first. Page 6 of 7: previous 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.