Little Dalton Wash
2026 303(d) list Waterbody ID CAR4052000020210323060989 River & Stream Region 4 · Los Angeles
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 5 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 5 pollutants in 3 Appendix A categories
- Metals (3) · Pathogens (1) · Pesticides (1)
- Listing decisions
- TMDL information Evidence: State-published
- 5 decisions with a TMDL requirement status
- Status codes as published: 5A
- TMDL details
- Industrial stormwater facilities
- 19 report it as their receiving water Evidence: identification corroborated
- 85 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
- 5
- 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
- 4 — Los Angeles
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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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.
Metals (3 decisions)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Copper | Metals | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 140193 |
| Lead | Metals | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 140198 |
| Zinc | Metals | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 140206 |
Pathogens (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Indicator Bacteria | Pathogens | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 150296 |
Pesticides (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| alpha-Endosulfan (Endosulfan 1) | Pesticides | 5 | List on 303(d) list (TMDL required list) | Revised | A Source Unknown | 140194 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| alpha-Endosulfan (Endosulfan 1) | 5A | — | Low | — | — |
| Copper | 5A | — | Low | — | — |
| Indicator Bacteria | 5A | — | Low | — | — |
| Lead | 5A | — | Low | — | — |
| Zinc | 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
- Big Dalton Wash 180701060402
Overlapping the waterbody's shape Evidence: spatial
- Big Dalton Wash 180701060402 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
| Facility | WDID | Status | Distance from reported location | Map |
|---|---|---|---|---|
| Complete Metal Design Inc | 4 19I027490 | Active | 58 m | map |
| Woodturning USA Inc | 4 19I019151 | Terminated | 450 m | map |
| Quality Bearings Inc | 4 19I028015 | Active | 647 m | map |
| AMR Irwindale | 4 19I019508 | Terminated | 648 m | map |
| Hannemann Fiberglass inc | 4 19I030048 | Active | 668 m | map |
| V L Auto Salvage | 4 19I023600 | Terminated | 749 m | map |
| Lots of Parts Auto Dismantler Inc | 4 19I022522 | Terminated | 810 m | map |
| Tecomet Inc | 4 19I019285 | Active | 855 m | map |
| Cemex Construction Materials Pacific LLC | 4 19I001527 | Terminated | 1.2 km | map |
| H K Concrete Co | 4 19I002122 | Terminated | 1.2 km | map |
| USA Waste of California Inc | 4 19I004450 | Active | 1.2 km | map |
| Standridge Granite Corp | 4 19I027579 | Active | 1.3 km | map |
| Harrison & Nichols | 4 19I027052 | Terminated | 1.4 km | map |
| CA Amforge | 4 19I001029 | Active | 1.6 km | map |
| Azusa Refinishing Company | 4 19I027947 | Terminated | 1.7 km | map |
| Lindsey Manufacturing Co | 4 19I031371 | Active | 1.8 km | map |
| Lindsey Manufacturing Co | 4 19NEC012829 | Terminated | 1.8 km | map |
| Dalou Corporation dba Tomco Product | 4 19I029257 | Terminated | 2.2 km | map |
| Dalou Corporation dba Tomco Product | 4 19NEC005047 | Terminated | 2.2 km | map |
Receiving water reported by facility — waterbody identification corroborated by geographic evidence. 19 facilities.
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 |
|---|---|---|---|---|
| SPS Glendora LLC | 4 19NNA001434 | No Action Required | 52 m | map |
| Complete Metal Design Inc | 4 19I027490 | Active | 58 m | map |
| Southwest Machine Plastic | 4 19NEC013749 | Active | 99 m | map |
| Swiss House | 4 19NEC007089 | Terminated | 132 m | map |
| Southwest Machine Plastic | 4 19I010695 | Terminated | 145 m | map |
| Southwest Machine Plastic | 4 19NEC004327 | Terminated | 145 m | map |
| Breeders Choice Pet Foods LLC | 4 19I029855 | Active | 184 m | map |
| Avery Dennison Co | 4 19I003299 | Terminated | 239 m | map |
| Artistic T Woodworking | 4 19NNA003412 | No Action Required | 278 m | map |
| Artistic T Woodworking | 4 19NNA003433 | No Action Required | 278 m | map |
| Sprint Graphics Inc. | 4 19NNA003667 | NONA Submitted | 279 m | map |
| Orange Blossom Cafe | 4 19NEC016256 | Active | 340 m | map |
| ELC Enterprise | 4 19NEC008812 | Terminated | 362 m | map |
| Acrylatex Coatings and Recycling Inc | 4 19I024436 | Terminated | 410 m | map |
| Citrus Cmnty College Dist | 4 19I018274 | Terminated | 413 m | map |
| Sparling Instruments LLC | 4 19NEC014051 | Active | 415 m | map |
| M&S Lighting | 4 19I029273 | Active | 443 m | map |
| Woodturning USA Inc | 4 19I019151 | Terminated | 450 m | map |
| Robert James Hull | 4 19I019154 | Terminated | 452 m | map |
| Panderia Aimaan Bakery | 4 19IN601013 | Undetermined | 466 m | map |
| M & S Lighting | 4 19IN600904 | Undetermined | 485 m | map |
| Alvaro Fabian Granite Cabinets | 4 19NEC009611 | Active | 487 m | map |
| Metal Engineering | 4 19IN600907 | Undetermined | 497 m | map |
| Covina Brake | 4 19IN600908 | Undetermined | 510 m | map |
| JAR Machine and Fabrication Inc | 4 19NEC004210 | Active | 516 m | map |
| JAR MACHINE AND FABRICATION INC | 4 19NEC005580 | Terminated | 520 m | map |
| Silverline Sheet Metal, LLC | 4 19IN604614 | Undetermined | 523 m | map |
| Sprint Graphics Inc | 4 19NEC007812 | Active | 526 m | map |
| Sprint Graphics Inc | 4 19NNA003668 | NONA Submitted | 526 m | map |
| Laidlaw Transit Irwindale Amr | 4 19I015006 | Terminated | 531 m | map |
| Nicks Cabinet Doors | 4 19IN601007 | Undetermined | 532 m | map |
| Laser Glass Dichroic | 4 19IN600957 | No Action Required | 535 m | map |
| Burrtec Waste Services LLC | 4 19I018755 | Active | 541 m | map |
| Place Racing Inc | 4 19IN600950 | No Action Required | 541 m | map |
| BMK PREMIUM FENCE | 4 19NEC011884 | Active | 543 m | map |
| Royal Dragon Inc | 4 19IN600951 | No Action Required | 557 m | map |
| Paramount | 4 19IN600952 | Undetermined | 560 m | map |
| Catalina Pacific Concrete | 4 19IN600958 | Undetermined | 560 m | map |
| New Allied Auto Wrecking | 4 19I015098 | Terminated | 576 m | map |
| J L Cruz Structural Steel | 4 19IN600953 | NOI Required | 582 m | map |
| Breeders Choice Pet Foods Inc | 4 19I020872 | Terminated | 586 m | map |
| Public Storage | 4 19NNA001374 | No Action Required | 600 m | map |
| PRECISION MACHINE PRODUCTS INC | 4 19NNA002949 | No Action Required | 604 m | map |
| Lilos Bakery | 4 19IN600928 | No Action Required | 624 m | map |
| Caliber Pool Services | 4 19IN601008 | No Action Required | 625 m | map |
| Quality Bearings Inc | 4 19I028015 | Active | 647 m | map |
| AMR Irwindale | 4 19I019508 | Terminated | 648 m | map |
| Quality Bearing Inc | 4 19IN601009 | No Action Required | 650 m | map |
| Hanneman Fiberglass | 4 19IN601010 | No Action Required | 660 m | map |
| Hannemann Fiberglass inc | 4 19I030048 | Active | 668 m | map |
85 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.