Alloy Processing
Active WDID 4 19I024577 Compton, Los Angeles County Region 4 · Los Angeles
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Compton, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Compton Creek (as reported by the facility)
- Evidence: identification corroborated Compton Creek Details
- Identified receiving water on the 2026 303(d) list
- Yes · 8 Appendix A decisions, category 5 Evidence: State-published
- Describes the waterbody, not this facility · Waterbody profile
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- None
- Monitoring results Evidence: facility-reported
- 495 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 19, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 8 violation records · 3 enforcement actions
- Counts as published in SMARTS; not a compliance determination · Details
Each label shows where a statement comes from. How to read the labels.
Overview and location
Reported facility location HUC12 watershed Corroborated receiving water 2026 Integrated Report waterbodies nearby
Reported location Evidence: facility-reported
- Coordinates
- 33.875493, -118.246948
- Precision
- 6 decimal places
- Shared point
- No
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 1900 W Walnut Street, Compton 90220
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Compton Creek-Los Angeles River HUC12 180701050402
The facility's reported location lies within this HUC12 watershed (spatial derivation); it is not a discharge location.
Permits and applications Evidence: SMARTS record
Current permit record
- Permit type
- Industrial
- Application type
- Notice of Intent (WDID code I)
- Status
- Active
- Operator
- Alloy Processing
- Primary industry (SIC)
- 3399-Primary Metal Products, NEC
- Application ID
- 443080
- NOI processed
- Dec 02, 2013
- Last certified
- Oct 09, 2026
- Facility size
- 6.5 Acres
- Impervious area
- 98 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 443080 | Industrial | Active | Dec 02, 2013 | — | Oct 09, 2026 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Compton Creek
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: identification corroborated Compton Creek CAR4051501019990202111430
Receiving water reported by facility — waterbody identification corroborated by geographic evidence.
Nearest distance from the reported facility location: 2.1 km. Method receiving_water/2.
2026 Integrated Report status Evidence: State-published
Compton Creek is on the 2026 Clean Water Act section 303(d) list (8 Appendix A decisions; category 5).
| Pollutant | Category | Listing decision | TMDL requirement | Decision ID |
|---|---|---|---|---|
| Aluminum | 5 | List on 303(d) list (TMDL required list) | 5A | 153906 |
| Benthic Community Effects | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 153905 |
| Copper | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Metals (13) | 89976 |
| Indicator Bacteria | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Pathogens (15) | 150286 |
| Lead | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Metals (13) | 70408 |
| pH | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Nitrogen (11) | 90033 |
| Trash | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | 5B · Los Angeles River Trash (12) | 70557 |
| Zinc | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Metals (13) | 138332 |
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. State Board adoption 2026-02-03; USEPA approval not confirmed. A listing describes the waterbody, not this facility. Waterbody profile.
Impaired waters and TMDLs
Two kinds of information, kept apart: 2026 Integrated Report waterbodies near the reported location (geographic proximity only), and TMDL records that SMARTS lists for this facility. Neither establishes where the facility discharges; see Receiving water for the facility's own statement.
Nearby waterbodies Evidence: geographic proximity
Spatial proximity only; discharge pathway not established. Being near a waterbody does not mean the facility discharges to it.
No 2026 Integrated Report waterbody lies within the proximity threshold of the reported location.
SMARTS TMDL records Evidence: SMARTS-reported
SMARTS TMDL record as reported for this facility; it is not a determination that the TMDL applies to the facility.
| TMDL | Waterbody (as reported) | Parameter | Limit | Type | Period | Due | Discharges to TMDL water |
|---|---|---|---|---|---|---|---|
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Cadmium, Total | .0031 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Copper, Total | .06749 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Lead, Total | .094 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Zinc, Total | .159 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrate, Total (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite Plus Nitrate (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite, Total (as N) | 1 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
7 records. Links between these records and specific TMDL projects or listed waterbodies have not been reviewed and are not shown.
Reported monitoring results Evidence: facility-reported
Numeric Action Level (NAL) screening is being independently validated and is not shown. Nothing on this page states whether a result exceeded a NAL.
495 distinct measurements across 10 parameters, most recent sample Feb 19, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 80 | 10 | 0 | Oct 14, 2025 | Feb 19, 2026 |
| 2024 | 30 | 10 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 50 | 10 | 0 | Dec 21, 2023 | Mar 06, 2024 |
| 2022 | 120 | 10 | 0 | Nov 08, 2022 | Mar 29, 2023 |
| 2021 | 90 | 10 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 26 | 9 | 0 | Jan 29, 2021 | Jan 29, 2021 |
| 2019 | 18 | 3 | 0 | Dec 04, 2019 | Mar 12, 2020 |
| 2018 | 27 | 3 | 0 | Dec 06, 2018 | Mar 06, 2019 |
| 2017 | 18 | 3 | 0 | Jan 09, 2018 | Mar 22, 2018 |
| 2016 | 27 | 3 | 0 | Dec 22, 2016 | Feb 17, 2017 |
| 2015 | 9 | 3 | 0 | Jan 05, 2016 | Jan 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| pH | SU | 73 | 3 | Jan 05, 2016 | Feb 19, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 73 | 0 | Jan 05, 2016 | Feb 19, 2026 | Results |
| Oil and Grease | mg/L | 72 | 33 | Jan 05, 2016 | Feb 19, 2026 | Results |
| Cadmium, Total | mg/L | 40 | 17 | Jan 29, 2021 | Feb 19, 2026 | Results |
| Copper, Total | mg/L | 40 | 1 | Jan 29, 2021 | Feb 19, 2026 | Results |
| Lead, Total | mg/L | 40 | 0 | Jan 29, 2021 | Feb 19, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 40 | 0 | Jan 29, 2021 | Feb 19, 2026 | Results |
| Nitrite, Total (as N) | mg/L | 40 | 23 | Jan 29, 2021 | Feb 19, 2026 | Results |
| Zinc, Total | mg/L | 40 | 0 | Jan 29, 2021 | Feb 19, 2026 | Results |
| Nitrate, Total (as N) | mg/L | 37 | 5 | Oct 25, 2021 | Feb 19, 2026 | Results |
All results (495 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 19, 2026 | Cadmium, Total | < .00004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Cadmium, Total | .0001 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Cadmium, Total | < .00004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Copper, Total | .002 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Copper, Total | .0012 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Copper, Total | .0027 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Lead, Total | .0002 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Lead, Total | .0001 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Lead, Total | .0003 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Nitrate, Total (as N) | .09 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrate, Total (as N) | .088 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrate, Total (as N) | .11 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .09 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .088 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .11 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrite, Total (as N) | .09 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrite, Total (as N) | .088 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Nitrite, Total (as N) | .11 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365283 | |
| Feb 19, 2026 | Oil and Grease | < 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1365283 | |
| Feb 19, 2026 | Oil and Grease | < 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1365283 | |
| Feb 19, 2026 | Oil and Grease | < 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1365283 | |
| Feb 19, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | A4500HB | 1365283 | |
| Feb 19, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | A4500HB | 1365283 | |
| Feb 19, 2026 | pH | 6 | SU | Effluent | Qualifying Storm Event | A4500HB | 1365283 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 1.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1365283 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 1.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1365283 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 2.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1365283 | |
| Feb 19, 2026 | Zinc, Total | .052 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Zinc, Total | .076 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Feb 19, 2026 | Zinc, Total | .064 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365283 | |
| Dec 27, 2025 | Cadmium, Total | .0004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Cadmium, Total | < .00004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Cadmium, Total | < .00004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Copper, Total | .0018 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Copper, Total | .0029 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Copper, Total | .0045 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Lead, Total | .0004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Lead, Total | .0005 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Lead, Total | .0003 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1365257 | |
| Dec 27, 2025 | Nitrate, Total (as N) | .096 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrate, Total (as N) | .081 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrate, Total (as N) | .13 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrite Plus Nitrate (as N) | .096 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrite Plus Nitrate (as N) | .081 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrite Plus Nitrate (as N) | .13 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrite, Total (as N) | .096 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrite, Total (as N) | .081 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Nitrite, Total (as N) | .13 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1365257 | |
| Dec 27, 2025 | Oil and Grease | 2.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1365257 | |
| Dec 27, 2025 | Oil and Grease | 3.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1365257 |
Results are shown exactly as reported by the discharger. Identical rows repeated in the State's export are shown once. Where the export contains different versions of the same sample and parameter, each version is listed and flagged. Details.
Compliance and enforcement records Evidence: SMARTS record
These are records as the State Water Board publishes them in SMARTS, with the source's own types and statuses. They are not a compliance determination or rating. A record listed here is not proof of a violation beyond what the source states, and the absence of records does not establish compliance.
| Record type | Records | As published | Dates | Retrieved | List |
|---|---|---|---|---|---|
| Violations | 8 | 8 Violation · 0 Potential (preliminary) · 0 Dismissed | Dec 20, 2023 – Sep 26, 2024 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Dec 20, 2023 – Sep 26, 2024 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Apr 08, 2024 – Apr 08, 2024 | Oct 21, 2026 | All inspections |
| Annual reports | 11 | certified reports (contents not shown) | 2015 – 2025 | Oct 21, 2026 | All reports |
| Water-quality-based corrective action reports | 1 | reports, by parameter | 2022-23 – 2022-23 | Oct 21, 2026 | All reports |
Each record type is counted by its own SMARTS identifier. A violation and the enforcement action that cites it are two records in two lists; they are never added together.
Chronological record history (24 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 13, 2026 | Annual reports | 1338248 | Annual report 2025 | — | |
| Jul 23, 2025 | Annual reports | 1297232 | Annual report 2024 | — | |
| Nov 21, 2024 | Water-quality-based corrective action reports | 1314553 | WQBCAR 2022-23 | — | Zinc, Total |
| Sep 26, 2024 | Enforcement actions | 454907 | ACL (Administrative Civil Liability) | Historical | R4-2024-0349 |
| Sep 26, 2024 | Violations | 890539 | Effluent | Violation | Report |
| Sep 26, 2024 | Violations | 890540 | Late Report | Violation | Report |
| Aug 22, 2024 | Enforcement actions | 454116 | NOV (Notice of Violation) | Historical | |
| Aug 22, 2024 | Violations | 889785 | Incomplete/Insufficient SWPPP | Violation | Report |
| Jun 28, 2024 | Annual reports | 1246456 | Annual report 2023 | — | |
| Apr 08, 2024 | Inspections | 2064018 | B Type compliance | Finalized | Additional Info Required |
| Dec 20, 2023 | Enforcement actions | 452521 | ACL (Administrative Civil Liability) | Historical | R4-2023-0397 |
| Dec 20, 2023 | Violations | 887676 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887677 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887678 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887679 | Effluent | Violation | Report |
| Dec 20, 2023 | Violations | 887680 | Late Report | Violation | Report |
| Jul 15, 2023 | Annual reports | 1192605 | Annual report 2022 | — | |
| Jul 11, 2022 | Annual reports | 1116314 | Annual report 2021 | — | |
| Jul 20, 2021 | Annual reports | 1064470 | Annual report 2020 | — | |
| Jul 11, 2020 | Annual reports | 981471 | Annual report 2019 | — | |
| Jun 25, 2019 | Annual reports | 957789 | Annual report 2018 | — | |
| Jul 09, 2018 | Annual reports | 943233 | Annual report 2017 | — | |
| Jul 14, 2017 | Annual reports | 882766 | Annual report 2016 | — | |
| Aug 03, 2016 | Annual reports | 839312 | Annual report 2015 | — |
Sources and provenance
| Information | Source | Retrieved or published |
|---|---|---|
| Permit, location, receiving-water text | SMARTS Industrial Application Specific Data | Oct 20, 2026 |
| Permit history | SMARTS Storm Water Applications | Oct 20, 2026 |
| Monitoring results | SMARTS Industrial Parameter Data | Oct 20, 2026 |
| 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 with methods facility_huc12/1, proximity/1, receiving_water/2, tmdl_reference/1, waterbody_huc12_ovl/1, waterbody_huc12_pub/1; proximity threshold 1.0 km.
How to read the evidence labels
- Evidence: SMARTS record Evidence: facility-reported Information as published in SMARTS or reported by the discharger.
- Evidence: identification corroborated The reported receiving-water name identifies one official waterbody and the facility's location is consistent with it. It does not establish a discharge pathway.
- Evidence: candidate, awaiting review Evidence: not confirmed The reported name could match one or more official waterbodies, but no identification has been confirmed; nothing is assigned without review.
- Evidence: spatial Evidence: geographic proximity Derived from the reported location only.
- Evidence: SMARTS-reported Source records whose links to official references are not yet reviewed.
- Evidence: unavailable The information could not be loaded or is not in the sources.
Records are shown as published and are not compliance determinations. How geographic context is derived.