San Marcos Creek, unnamed fork at Twin Oaks Valley Road
Not in 2026 Appendix A Waterbody ID CAR9045300020110812113554 River & Stream Region 9 · San Diego
At a glance
- Pollutants and stressors
- No Appendix A decisions
- Industrial stormwater facilities
- 0 report it as their receiving water Evidence: identification corroborated
- 97 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.
- 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
- No (2026 geometry only)
- Appendix A decisions
- 0
- Integrated Report category
- —
- Listing cycle
- 2026
- Regional Water Board
- 9 — San Diego
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
No Appendix A decisions for this waterbody.
TMDL information Evidence: State-published
Appendix A records no TMDL requirement status for this waterbody.
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
None published.
Overlapping the waterbody's shape Evidence: spatial
- San Marcos Creek 180703030503
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
No facility's reported receiving water is identified as this waterbody.
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 |
|---|---|---|---|---|
| tosti design | 9 37NEC002719 | Terminated | 40 m | map |
| tosti design | 9 37NEC012399 | Terminated | 40 m | map |
| Hydraulic Systems Components Inc | 9 37I020193 | Terminated | 40 m | map |
| Mandaric Bicycles | 9 37IN601122 | Undetermined | 40 m | map |
| Dallmann Confections Inc | 9 37NEC008989 | Active | 44 m | map |
| Hydraulic Systems and Components Inc | 9 37NEC008373 | Terminated | 46 m | map |
| PSN Machine | 9 37NEC003821 | Active | 49 m | map |
| D&D Cycle | 9 37NEC014941 | Active | 50 m | map |
| D & D Cycle | 9 37NEC007501 | Active | 56 m | map |
| CML Engineering Sales Inc | 9 37NNA002639 | NONA Submitted | 56 m | map |
| Aguilar Fine Cabinetry | 9 37IN601134 | Undetermined | 75 m | map |
| D and D Cycle | 9 37IN601189 | Undetermined | 78 m | map |
| MPP San Diego | 9 37I006302 | Terminated | 98 m | map |
| GPM Engineering | 9 37IN601108 | Undetermined | 99 m | map |
| CFF Woodworks | 9 37IN601129 | Undetermined | 100 m | map |
| CFF Woodworks | 9 37IN601130 | Undetermined | 100 m | map |
| Harvey Eng | 9 37IN601090 | Undetermined | 100 m | map |
| Tanaka Designs | 9 37I014803 | Terminated | 101 m | map |
| US Postal Ser San Marcos | 9 37I013155 | Terminated | 113 m | map |
| PACIFIC METAL PRODUCTS | 9 37NEC001001 | Terminated | 117 m | map |
| PACIFIC METAL PRODUCTS | 9 37NEC004657 | Terminated | 117 m | map |
| Bera Stained Glass Studios | 9 37NEC001629 | Active | 130 m | map |
| Busch Woodworking | 9 37NEC011815 | Active | 132 m | map |
| CubeSmart 227 | 9 37NNA001808 | NONA Submitted | 132 m | map |
| WHITE GLOVE SERVICES INC | 9 37NNA001661 | NONA Submitted | 139 m | map |
| WHITE GLOVE SERVICES INC | 9 37NNA002670 | NONA Submitted | 140 m | map |
| Unique Functional Product | 9 37I002008 | Terminated | 143 m | map |
| MoreauWorks LLC | 9 37NEC014727 | Active | 147 m | map |
| leinig incorporated | 9 37NEC001090 | Terminated | 156 m | map |
| VES | 9 37NEC016154 | Active | 164 m | map |
| Innovative Microscopes | 9 37NEC016230 | Active | 164 m | map |
| Twin Oaks Commerse Center | 9 37NNA003653 | NONA Submitted | 212 m | map |
| Newest Sheet Metal | 9 37I028840 | Active | 215 m | map |
| Twin Oaks Business Park | 9 37NEC015135 | Active | 222 m | map |
| Dexter Marine Products LLC | 9 37I024990 | Active | 223 m | map |
| Tomar | 9 37NEC007651 | Terminated | 224 m | map |
| Lamb Screen Printing Inc | 9 37NEC014601 | Active | 224 m | map |
| Mandaric Bicycles | 9 37NEC008661 | Terminated | 266 m | map |
| Tomar Water Systems 131 | 9 37NEC011356 | Terminated | 266 m | map |
| Premier Desings And Manufacturing LLC | 9 37NEC014623 | Active | 266 m | map |
| Old World Wood | 9 37NEC002643 | Terminated | 356 m | map |
| Aloha Printing | 9 37NEC013405 | Active | 357 m | map |
| Larios Plaster Equipment | 9 37NNA002974 | NONA Submitted | 357 m | map |
| Storage West San Marcos | 9 37IN600838 | Undetermined | 452 m | map |
| CubeSmart 153 | 9 37NNA002079 | NONA Submitted | 548 m | map |
| Table Space | 9 37NEC009640 | Active | 552 m | map |
| Stomar Inc | 9 37NNA001524 | NONA Submitted | 572 m | map |
| Motoport USA | 9 37NEC008028 | Terminated | 586 m | map |
| AFB Warehouse | 9 37NNA002725 | NONA Submitted | 587 m | map |
| Cycleport USA | 9 37IN601200 | Undetermined | 609 m | map |
97 facilities, nearest first. Page 1 of 2: next
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.