San Tomas Aquino Creek (Santa Clara County)
2026 303(d) list Waterbody ID CAR2055004020080624165713 River & Stream Region 2 · San Francisco Bay
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 4 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 4 pollutants in 4 Appendix A categories
- Nutrients (1) · Other Cause (1) · Total Toxics (1) · Trash (1)
- Listing decisions
- TMDL information Evidence: State-published
- 4 decisions with a TMDL requirement status
- Status codes as published: 5A, 5C
- TMDL details
- Industrial stormwater facilities
- 0 report it as their receiving water Evidence: identification corroborated
- 121 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
- 4
- 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
- 2 — San Francisco Bay
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.
Nutrients (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Ammonia | Nutrients | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 151012 |
Other Cause (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Benthic Community Effects | Other Cause | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 154159 |
Total Toxics (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Toxicity | Total Toxics | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 142736 |
Trash (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Trash | Trash | 5 | Do Not Delist from 303(d) list (being addressed with action other than TMDL) | Original | A Source Unknown | 99866 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Ammonia | 5A | — | Low | — | — |
| Benthic Community Effects | 5A | — | Low | — | — |
| Toxicity | 5A | — | Low | — | — |
| Trash | 5C | — | — | — | 2029 |
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
- San Jose International Airport-Frontal San Francisco Bay Estuaries 180500030306
- San Tomas Aquinas Creek 180500030401
- Saratoga Creek 180500030402
- Calabazas Creek-Frontal San Francisco Bay Estuaries 180500030405
- San Francisco Bay Estuaries-Frontal San Francisco Bay 180500041001
Overlapping the waterbody's shape Evidence: spatial
- San Tomas Aquinas Creek 180500030401 also published
- Saratoga Creek 180500030402 also published
- Calabazas Creek-Frontal San Francisco Bay Estuaries 180500030405 also published
- San Francisco Bay Estuaries-Frontal San Francisco Bay 180500041001 also published
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 |
|---|---|---|---|---|
| Ultratech Stepper Inc | 2 43I006944 | Terminated | 1 m | map |
| Kawaski Wafer Tech | 2 43I010007 | Terminated | 6 m | map |
| Memc Electronic Materials | 2 43I011136 | Terminated | 6 m | map |
| Unisil Corp | 2 43I013308 | Terminated | 6 m | map |
| Coherent Medical Grp | 2 43I015197 | Terminated | 24 m | map |
| Lumenis Inc | 2 43I016533 | Terminated | 24 m | map |
| Celeritek Inc | 2 43I011031 | Terminated | 89 m | map |
| Mimix Broadband Inc | 2 43I019576 | Terminated | 89 m | map |
| Universal Semiconductor Technology Inc | 2 43I020384 | Terminated | 89 m | map |
| West Valley Graphics | 2 43I004278 | Terminated | 93 m | map |
| Verb Surgical Incorporate | 2 43NEC008434 | Active | 113 m | map |
| Auris Health Inc | 2 43NEC015932 | Active | 113 m | map |
| Prosil Div Unisil | 2 43I006550 | Terminated | 121 m | map |
| Ultratech Stepper Inc | 2 43I006943 | Terminated | 129 m | map |
| Collinear Corporation | 2 43I020394 | Terminated | 133 m | map |
| Santa Clara City Gianera Power | 2 43I013076 | Active | 140 m | map |
| Rosemount Analytical | 2 43I009052 | Terminated | 148 m | map |
| Samtec | 2 43NEC003929 | Active | 179 m | map |
| Whizz Systems Incorporation | 2 43NEC004508 | Active | 193 m | map |
| Shockwave Medical Inc | 2 43NEC011631 | Active | 208 m | map |
| US Postal Ser | 2 43I013042 | Terminated | 222 m | map |
| Shockwave Medical | 2 43NEC011632 | Active | 258 m | map |
| Synergy Semiconductor Inc | 2 43I013140 | Terminated | 264 m | map |
| Synergy Semiconductor | 2 43I014928 | Terminated | 264 m | map |
| Shockwave Medical Inc | 2 43NEC015162 | Active | 265 m | map |
| Westinghouse Security Elect | 2 43I006644 | Terminated | 265 m | map |
| Qualitau Inc | 2 43NEC006145 | Terminated | 271 m | map |
| Apple Inc | 2 43NEC009373 | Terminated | 274 m | map |
| Media Sciences | 2 43I006869 | Terminated | 294 m | map |
| Cordis US Corp | 2 43NEC009277 | Terminated | 305 m | map |
| Cordis US Corp | 2 43NEC010317 | Active | 305 m | map |
| Analog Devices Inc | 2 43NEC007586 | Terminated | 336 m | map |
| Dupont Photomasks | 2 43I006914 | Terminated | 339 m | map |
| Electroglas Inc | 2 43I009048 | Terminated | 339 m | map |
| Crystal Solar Inc | 2 43I022335 | Terminated | 341 m | map |
| Crystal Solar Inc | 2 43NEC000081 | Terminated | 341 m | map |
| Applied Materials Inc | 2 43I011684 | Terminated | 345 m | map |
| Shockwave Medical Inc | 2 43NEC011819 | Active | 345 m | map |
| Garage Winemaker LLC | 2 43NEC000939 | Terminated | 356 m | map |
| Toppan Photomasks Inc | 2 43I022247 | Terminated | 359 m | map |
| Alta Devices Inc | 2 43I022717 | Terminated | 374 m | map |
| Keysight Technologies | 2 43NEC011713 | Active | 376 m | map |
| Toppan Photomasks Inc | 2 43NEC000257 | Terminated | 395 m | map |
| Qualitau Inc | 2 43NEC013114 | Active | 406 m | map |
| ENS Technology | 2 43I028208 | Active | 409 m | map |
| FujiFilm | 2 43I019034 | Active | 432 m | map |
| Intel | 2 43I006616 | Terminated | 440 m | map |
| MiaSole Bldg #1 | 2 43I021935 | Terminated | 464 m | map |
| Vishay Siliconix | 2 43I006538 | Terminated | 466 m | map |
| Building Robotics Inc | 2 43NEC013377 | Terminated | 467 m | map |
121 facilities, nearest first. Page 1 of 3: 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.