Rio Hondo Reach 2 (At Spreading Grounds)
2026 303(d) list Waterbody ID CAR4051501019990202114543 River & Stream Region 4 · Los Angeles
At a glance
- 2026 listing Evidence: State-published
- On the 2026 303(d) list · 2 Appendix A decisions
- Category 5: a TMDL is required
- What a listing means
- Pollutants and stressors
- 2 pollutants in 2 Appendix A categories
- Pathogens (1) · Toxic Inorganics (1)
- Listing decisions
- TMDL information Evidence: State-published
- 2 decisions with a TMDL requirement status; 1 name a TMDL project
- Status codes as published: 5A, 5B
- TMDL details
- Industrial stormwater facilities
- 2 report it as their receiving water Evidence: identification corroborated
- 139 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
- 2
- 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
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.
Pathogens (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Coliform Bacteria | Pathogens | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | Original | A Source Unknown | 70436 |
Toxic Inorganics (1 decision)
| Pollutant | Pollutant category | Category | Final listing decision | Decision status | Sources | Decision ID |
|---|---|---|---|---|---|---|
| Cyanide | Toxic Inorganics | 5 | List on 303(d) list (TMDL required list) | Original | A Source Unknown | 78681 |
TMDL information Evidence: State-published
| Pollutant | TMDL requirement status | TMDL project | Priority | USEPA approval of TMDL | Expected attainment |
|---|---|---|---|---|---|
| Coliform Bacteria | 5B | Los Angeles River Pathogens (15) | — | 2012-03-23 | — |
| Cyanide | 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
- Alhambra Wash-Rio Hondo 180701050303
Overlapping the waterbody's shape Evidence: spatial
- Alhambra Wash-Rio Hondo 180701050303 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 |
|---|---|---|---|---|
| Amware Pallet Services | 4 19I029619 | Active | 644 m | map |
| USA Waste of California Inc | 4 19I027524 | Terminated | 651 m | map |
Receiving water reported by facility — waterbody identification corroborated by geographic evidence. 2 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 |
|---|---|---|---|---|
| WM Recycle America Pico Rivera | 4 19I019832 | Terminated | 651 m | map |
| USA Waste of California Inc | 4 19I027524 | Terminated | 651 m | map |
| KAIZEN LOGISTICS INC | 4 19NNA002332 | Terminated | 667 m | map |
| KAIZEN LOGISTICS INC | 4 19NNA003382 | No Action Required | 667 m | map |
| Hollander Sleep Products | 4 19I029612 | Terminated | 679 m | map |
| Montebello Plastics LLC | 4 19I020786 | Active | 692 m | map |
| Bay Cities Containers | 4 19NEC010772 | Active | 697 m | map |
| ABF Freight System Inc | 4 19I002408 | Terminated | 711 m | map |
| ABF Freight System Inc | 4 19NEC000160 | Active | 711 m | map |
| Conroy and Knowlton Inc | 4 19NEC008678 | Terminated | 711 m | map |
| CONROY AND KNOWLTON INC | 4 19NEC011491 | Active | 711 m | map |
| GRM Information Management Services of California | 4 19NNA001844 | No Action Required | 720 m | map |
| Neils Logistics | 4 19NEC016133 | Active | 725 m | map |
| Source Logistics LLC | 4 19NEC005110 | Active | 734 m | map |
| Heavy Trans Logistics Inc | 4 19NEC014382 | Active | 776 m | map |
| Pico Rivera | 4 19NEC012818 | Active | 776 m | map |
| Barrett Distribution Centers | 4 19NEC015726 | Active | 777 m | map |
| Angry Horse Brewing | 4 19NEC009265 | Active | 780 m | map |
| Rcrd made by mistake See const Rcrd | 4 19IN602582 | No Action Required | 787 m | map |
| Leggett & Platt Inc | 4 19I011751 | Terminated | 809 m | map |
| WM Recycle America Fishman Buyback | 4 19I019846 | Terminated | 814 m | map |
| Lilly Industries Inc | 4 19I000617 | Terminated | 820 m | map |
| Lilly Industries Inc | 4 19I016192 | Terminated | 820 m | map |
| Valspar Industries Usa Inc | 4 19I016421 | Terminated | 820 m | map |
| KRAFT BAG USA | 4 19NEC014751 | Active | 827 m | map |
| Jimco Inc | 4 19I029808 | Active | 842 m | map |
| Le Chef Bakery | 4 19NEC008745 | Active | 847 m | map |
| Jimco Greenwood | 4 19NNA001671 | No Action Required | 848 m | map |
| W R Grace Construction Co | 4 19I009618 | Terminated | 855 m | map |
| GCP Applied Technologies Inc | 4 19I026391 | Active | 855 m | map |
| Usf Distribution Svc | 4 19I010844 | Terminated | 900 m | map |
| National Construction Rentals | 4 19I019298 | Active | 900 m | map |
| Xtreme Recycling | 4 19NNA001325 | NEC Required | 901 m | map |
| Penske Logistics | 4 19I023842 | Terminated | 927 m | map |
| Scully Transportation Services Inc | 4 19I021439 | Terminated | 936 m | map |
| Certified Industrial Fabricators Inc | 4 19NEC010992 | Terminated | 941 m | map |
| DPF Cleaning Service | 4 19IN607971 | NOI Required | 966 m | map |
| Eastco Powder Coating | 4 19NEC013532 | Active | 976 m | map |
| SOS Metals Inc | 4 19I002238 | Terminated | 976 m | map |
139 facilities, nearest first. Page 3 of 3: previous
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.