Salinas River (upper, confluence of Nacimiento River to Santa Margarita Reservoir)
2026 303(d) list Waterbody ID CAR3098117720020319112226 River & Stream Region 3 · Central Coast
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 6 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 6 pollutants in 4 Appendix A categories
- Nutrients (1) · Other Cause (2) · SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES (2) · Total Toxics (1)
- Listing decisions
- TMDL information Evidence: State-published
- 6 decisions with a TMDL requirement status
- Status codes as published: 5A
- TMDL details
- Industrial stormwater facilities
- 0 report it as their receiving water Evidence: identification corroborated
- 96 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
- 6
- 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
- 3 — Central Coast
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 |
|---|---|---|---|---|---|---|
| Oxygen, Dissolved | Nutrients | 5 | List on 303(d) list (TMDL required list) | Revised | No Source Analysis Available | 108870 |
Other Cause (2 decisions)
| 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 | No Source Analysis Available | 131891 |
| pH | Other Cause | 5 | Do Not Delist from 303(d) list (TMDL required list) | Revised | No Source Analysis Available | 108871 |
SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES (2 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Chloride | SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES | 5 | Do Not Delist from 303(d) list (TMDL required list) | Original | A Source Unknown | 83883 |
| Sodium | SALINITY/TOTAL DISSOLVED SOLIDS/CHLORIDES/SULFATES | 5 | Do Not Delist from 303(d) list (TMDL required list) | Original | A Source Unknown | 77887 |
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 | No Source Analysis Available | 108875 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Benthic Community Effects | 5A | — | Low | — | — |
| Chloride | 5A | — | Low | — | — |
| Oxygen, Dissolved | 5A | — | Low | — | — |
| pH | 5A | — | Low | — | — |
| Sodium | 5A | — | Low | — | — |
| Toxicity | 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
- Town of Estrella-Estrella River 180600040410
- San Margarita Lake-Salinas River 180600050104
- Pilitas Creek-Salinas River 180600050203
- Paloma Creek-Salinas River 180600050205
- Lower Huerhuero Creek 180600050307
- Graves Creek-Salinas River 180600050403
- Town of Templeton-Salinas River 180600050404
- Mustard Creek-Salinas River 180600050405
- Bridge Canyon-Salinas River 180600050407
- Vineyard Canyon 180600050801
The published list is truncated in Appendix A; it is not a complete list of watersheds.
Overlapping the waterbody's shape Evidence: spatial
- Town of Estrella-Estrella River 180600040410 also published
- San Margarita Lake-Salinas River 180600050104 also published
- Pilitas Creek-Salinas River 180600050203 also published
- Paloma Creek-Salinas River 180600050205 also published
- Lower Huerhuero Creek 180600050307 also published
- Graves Creek-Salinas River 180600050403 also published
- Town of Templeton-Salinas River 180600050404 also published
- Mustard Creek-Salinas River 180600050405 also published
- Bridge Canyon-Salinas River 180600050407 also published
- Vineyard Canyon 180600050801 also published
- Portuguese Canyon-Salinas River 180600050802
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 |
|---|---|---|---|---|
| Artesia Ready Mix | 3 40I012506 | Terminated | 62 m | map |
| Hanson Aggregates | 3 40I020154 | Terminated | 62 m | map |
| Santa Margarita Asphalt Plant | 3 40IN602748 | No Action Required | 124 m | map |
| Santa Margarita Aggregates | 3 40I030416 | Active | 140 m | map |
| Santa Margarita Asphalt Plant | 3 40I025189 | Terminated | 148 m | map |
| Hanson Aggregates | 3 40I016009 | Terminated | 159 m | map |
| Paso Robles Wastewater Plant | 3 40I000177 | Terminated | 180 m | map |
| Paul Viborg | 3 40IN600395 | No Action Required | 242 m | map |
| Black Oak Lodge | 3 40I030729 | Terminated | 251 m | map |
| Al Lago Wines | 3 40NEC012011 | Active | 262 m | map |
| Paris Precision | 3 40NEC000838 | Terminated | 262 m | map |
| Giornata | 3 40IN603800 | No Action Required | 268 m | map |
| Calportland Construction | 3 40I016584 | Active | 268 m | map |
| Terrizzi Vino | 3 40NEC003395 | Active | 269 m | map |
| Tdl Ent | 3 40I011010 | Terminated | 278 m | map |
| Rossi Trans | 3 40I004498 | Terminated | 298 m | map |
| Rossi Trans | 3 40NEC000407 | Terminated | 298 m | map |
| Granite Construction Templeton | 3 40I031679 | Active | 310 m | map |
| Paso Robles Recycling Center | 3 40I019489 | Terminated | 316 m | map |
| Holliday Rock Paso Robles | 3 40I030314 | Active | 335 m | map |
| Hanson Aggregates | 3 40I024078 | Terminated | 335 m | map |
| Turtle Rock Vineyards | 3 40IN607924 | No Action Required | 373 m | map |
| Turtle Rock Vineyards | 3 40NEC013048 | Active | 374 m | map |
| North SLO County Recycling | 3 40I024694 | Terminated | 386 m | map |
| ONX Wines | 3 40IN603796 | No Action Required | 399 m | map |
| ONX Winery Inc | 3 40NEC003400 | Terminated | 399 m | map |
| Quinn Rental Services | 3 40I022737 | Terminated | 412 m | map |
| ONX Winery Inc | 3 40I028032 | Active | 413 m | map |
| Powell Mountain Cellars | 3 40IN603795 | NEC Required | 420 m | map |
| Powell Mountain Cellars | 3 40NEC004915 | Active | 429 m | map |
| Kritz Excavating and Trucking Inc | 3 40NEC012003 | Active | 429 m | map |
| Daniel B Giroux Auto Wrecking | 3 40I010042 | Terminated | 431 m | map |
| Paso Robles Auto Wrecking | 3 40I016770 | Active | 431 m | map |
| Desperada | 3 40IN603803 | No Action Required | 432 m | map |
| Wine Shine | 3 40IN603792 | NEC Required | 433 m | map |
| Desparada Wines | 3 40NEC003306 | Active | 433 m | map |
| Brian Benson Cellars | 3 40IN603805 | NOI Required | 437 m | map |
| Templeton Sch Dist Trans Fac | 3 40I000957 | Terminated | 447 m | map |
| Transportation Yard | 3 40I018574 | Active | 447 m | map |
| Alliance Ready Mix Incorporated | 3 40I026964 | Active | 448 m | map |
| Firestone Walker Inc | 3 40NEC001948 | Active | 449 m | map |
| North SLO County Transfer and Recycling | 3 40I030501 | Active | 455 m | map |
| End of the Day Wines (Caliza Wines) | 3 40IN607920 | NEC Required | 462 m | map |
| Field Recordings | 3 40IN603801 | No Action Required | 468 m | map |
| The Fableist | 3 40IN603802 | No Action Required | 468 m | map |
| Lefondusac | 3 40IN603798 | No Action Required | 468 m | map |
| Jacob Toft | 3 40IN603799 | NEC Required | 468 m | map |
| 22 Hundred Cellars DBA Field Recordings | 3 40NEC013137 | Active | 469 m | map |
| CONCUR Wines | 3 40NEC013403 | Active | 471 m | map |
| BarrelHouse Brewing Co. | 3 40IN603806 | NEC Required | 474 m | map |
96 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.