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
- TMDL information Evidence: State-published
- 1 decision with a TMDL requirement status
- Status codes as published: 5A
- TMDL details
- 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)
| 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
| 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
| 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.
| Facility | WDID | Status | Distance | Map |
|---|---|---|---|---|
| Garbiso Machine | 8 36NEC010898 | Terminated | 481 m | map |
| Walmart Distribution Center 8103 | 8 36NEC001796 | Active | 484 m | map |
| USA Truck bodies | 8 33NEC014609 | Active | 486 m | map |
| CITRUS AND ALLIED ESSENCES LTD | 8 33NNA001058 | No Action Required | 490 m | map |
| Westlake Royal Roofing LLC | 8 33I029922 | Active | 494 m | map |
| Amazon com Services Inc DLA7 | 8 36NEC003390 | Terminated | 509 m | map |
| Airtech International Incorporated | 8 36NEC006753 | Active | 511 m | map |
| MEDIWASTE DISPOSAL | 8 33NEC007704 | Active | 519 m | map |
| Mega Plastic | 8 33NEC011314 | Active | 528 m | map |
| Webb Stotler Engineering Inc. | 8 33IN606063 | Terminated | 536 m | map |
| Webb Stotler Engineering Inc. | 8 33NEC007566 | Terminated | 536 m | map |
| Aircraft Eagle Engineering | 8 33NNA000802 | No Action Required | 542 m | map |
| Lechuga Tech | 8 33NEC007886 | Active | 543 m | map |
| ALMEX USA INC | 8 33NEC014668 | Active | 547 m | map |
| California Wire Products | 8 33NEC009767 | Active | 548 m | map |
| YD Window Inc | 8 33I029410 | Active | 549 m | map |
| Great Pacific Elbow | 8 36I027218 | Terminated | 554 m | map |
| Bimbo Bakeries USA Inc Corona Sales Center | 8 33NNA000575 | No Action Required | 556 m | map |
| Greenland Resource Inc | 8 36NEC009972 | Active | 557 m | map |
| Athena By Virgil | 8 36I011804 | Terminated | 558 m | map |
| Luchador Brewing Company | 8 36NEC008739 | Active | 560 m | map |
| United Metal Products | 8 33I028915 | Active | 569 m | map |
| Premier Gear & Machining | 8 33NEC011548 | Active | 571 m | map |
| Gro Power Inc | 8 36I020912 | Terminated | 571 m | map |
| Rohart Precision Molds Inc | 8 36NEC008072 | Active | 573 m | map |
| Tree House Pad & Paper Inc | 8 33NEC008253 | Active | 576 m | map |
| Trical Inc | 8 33I009489 | Terminated | 586 m | map |
| MillworX Precision Machining Inc | 8 33I027347 | Active | 586 m | map |
| Universal Polymer Corporation | 8 36NEC002571 | Active | 587 m | map |
| Leitner Designs | 8 33NEC014890 | Active | 589 m | map |
| Dart Container CA | 8 33I002752 | Active | 597 m | map |
| MegaPlastic | 8 33NEC006261 | Terminated | 601 m | map |
| Gilder Corporation | 8 33NNA000873 | No Action Required | 602 m | map |
| AMERIFLEX | 8 33NEC006136 | Terminated | 603 m | map |
| Corona Fire Dept | 8 33I001302 | Terminated | 604 m | map |
| Boral Roofing LLC | 8 33I000230 | Terminated | 605 m | map |
| LEGACY AEROSPACE | 8 33NEC015975 | Active | 607 m | map |
| Alta Environmental Services Inc | 8 33IN607766 | NOI Required | 607 m | map |
| Alta Environmental Services Inc | 8 33NEC012467 | Active | 607 m | map |
| Total Chaos Fabrication Incorporated | 8 33NEC007220 | Active | 610 m | map |
| Rohart Precision Molds Inc | 8 36NEC007298 | Terminated | 615 m | map |
| INHOUSE MEDIA GROUP INC | 8 36NEC015629 | Active | 616 m | map |
| BrassCraft Manufacturing Company Corona | 8 33I010438 | Terminated | 626 m | map |
| WB Powell Inc | 8 33I027791 | Active | 627 m | map |
| CAL PRECISION INC | 8 33NEC001135 | Terminated | 643 m | map |
| SCR Molding Inc | 8 33NEC003313 | Active | 653 m | map |
| Dansereau Health Products Incorporated | 8 33NEC007183 | Active | 653 m | map |
| Dansereau Health Products Incorporated | 8 33NEC012433 | Terminated | 653 m | map |
| TWTH Express Inc | 8 36NEC014611 | Active | 655 m | map |
| FV Autoparts LLC | 8 33NEC012849 | Active | 658 m | map |
Sources and provenance
| 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.