Cascade Steel Rolling Mills Inc
Active WDID 4 19I004254 El Monte, 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
- El Monte, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Identified receiving water on the 2026 303(d) list
- Not established
- Shown only when the reported receiving water is identified and corroborated.
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- 2 waterbodies; 2 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 331 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Feb 19, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 3 inspections · 6 violation records · 4 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
- 34.0617, -118.01222
- Precision
- 4 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
- 3240 Durfee Ave, El Monte 91732
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Santa Fe Flood Control Basin-San Gabriel River HUC12 180701060601
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
- Cascade Steel Rolling Mills Inc
- Primary industry (SIC)
- 4225-General Warehousing and Storage
- Application ID
- 189333
- NOI processed
- Apr 06, 1992
- Last certified
- Mar 03, 2024
- Facility size
- 7 Acres
- Impervious area
- 29 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 189333 | Industrial | Active | Apr 06, 1992 | — | Mar 03, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- —
- Discharges directly / indirectly
- N / N (as answered in the permit application)
No receiving-water text was reported for this permit.
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.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| San Gabriel River Reach 3 (Whittier Narrows to Ramona) CAR4053100019980917153706 | 604 m | listed | 2 |
| Walnut Creek Wash (Drains from Puddingstone Res) CAR4053100019980918112433 | 622 m | listed | 4 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
SMARTS TMDL records Evidence: SMARTS-reported
No TMDL records for this facility in the SMARTS TMDL export.
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.
331 distinct measurements across 9 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 | 45 | 9 | 0 | Oct 14, 2025 | Feb 19, 2026 |
| 2024 | 25 | 9 | 0 | Feb 07, 2025 | Mar 13, 2025 |
| 2023 | 54 | 9 | 0 | Aug 21, 2023 | Feb 20, 2024 |
| 2022 | 41 | 9 | 0 | Nov 08, 2022 | Feb 24, 2023 |
| 2021 | 45 | 9 | 0 | Dec 14, 2021 | Jun 22, 2022 |
| 2020 | 27 | 9 | 0 | Dec 28, 2020 | Dec 29, 2021 |
| 2019 | 43 | 9 | 0 | Nov 20, 2019 | Apr 06, 2020 |
| 2018 | 21 | 8 | 0 | Dec 06, 2018 | Jan 31, 2019 |
| 2017 | 6 | 3 | 0 | Jan 09, 2018 | Mar 02, 2018 |
| 2016 | 12 | 3 | 0 | Oct 24, 2016 | Jan 19, 2017 |
| 2015 | 12 | 3 | 0 | Dec 22, 2015 | Mar 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 45 | 12 | Dec 22, 2015 | Feb 19, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 45 | 0 | Dec 22, 2015 | Feb 19, 2026 | Results |
| pH | SU | 43 | 0 | Dec 22, 2015 | Feb 19, 2026 | Results |
| Chemical Oxygen Demand (COD) | mg/L | 35 | 7 | Dec 06, 2018 | Feb 19, 2026 | Results |
| Copper, Total | mg/L | 35 | 3 | Dec 06, 2018 | Feb 19, 2026 | Results |
| Zinc, Total | mg/L | 35 | 3 | Dec 06, 2018 | Feb 19, 2026 | Results |
| Iron, Total | mg/L | 34 | 3 | Dec 06, 2018 | Feb 19, 2026 | Results |
| Lead, Total | mg/L | 33 | 4 | Jan 31, 2019 | Feb 19, 2026 | Results |
| Temperature | Degrees C | 26 | 0 | Nov 20, 2019 | Feb 19, 2026 | Results |
All results (331 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 19, 2026 | Chemical Oxygen Demand (COD) | ND | mg/L | Effluent | Qualifying Storm Event | E410.4 | 1369187 | |
| Feb 19, 2026 | Copper, Total | .00977 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1369187 | |
| Feb 19, 2026 | Iron, Total | 2.14 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1369187 | |
| Feb 19, 2026 | Lead, Total | .00888 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1369187 | |
| Feb 19, 2026 | Oil and Grease | 2.71 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1369187 | |
| Feb 19, 2026 | pH | 8.87 | SU | Effluent | Qualifying Storm Event | pH_Field | 1369187 | |
| Feb 19, 2026 | Temperature | 13.22222 | Degrees C | Effluent | Qualifying Storm Event | A2550B | 1369187 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | 35.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1369187 | |
| Feb 19, 2026 | Zinc, Total | .246 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1369187 | |
| Feb 16, 2026 | Chemical Oxygen Demand (COD) | 10.14 | mg/L | Effluent | Qualifying Storm Event | E410.4 | 1367455 | |
| Feb 16, 2026 | Copper, Total | .0115 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1367455 | |
| Feb 16, 2026 | Iron, Total | 1.93 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1367455 | |
| Feb 16, 2026 | Lead, Total | .0128 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1367455 | |
| Feb 16, 2026 | Oil and Grease | 4.28 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1367455 | |
| Feb 16, 2026 | pH | 8.95 | SU | Effluent | Qualifying Storm Event | pH_Field | 1367455 | |
| Feb 16, 2026 | Temperature | 57 | Degrees C | Effluent | Qualifying Storm Event | A2550B | 1367455 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 45.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1367455 | |
| Feb 16, 2026 | Zinc, Total | .254 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1367455 | |
| Nov 21, 2025 | Chemical Oxygen Demand (COD) | ND | mg/L | Effluent | Qualifying Storm Event | E410.4 | 1360075 | |
| Nov 21, 2025 | Copper, Total | .00778 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360075 | |
| Nov 21, 2025 | Iron, Total | .903 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1360075 | |
| Nov 21, 2025 | Lead, Total | .0055 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360075 | |
| Nov 21, 2025 | Oil and Grease | 1.36 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1360075 | |
| Nov 21, 2025 | pH | 8.48 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360075 | |
| Nov 21, 2025 | Temperature | 59 | Degrees C | Effluent | Qualifying Storm Event | A2550B | 1360075 | |
| Nov 21, 2025 | Total Suspended Solids (TSS) | 11.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360075 | |
| Nov 21, 2025 | Zinc, Total | .137 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360075 | |
| Nov 14, 2025 | Chemical Oxygen Demand (COD) | 21 | mg/L | Effluent | Qualifying Storm Event | E410.4 | 1359030 | |
| Nov 14, 2025 | Copper, Total | .0133 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1359030 | |
| Nov 14, 2025 | Iron, Total | .448 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1359030 | |
| Nov 14, 2025 | Lead, Total | .00381 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1359030 | |
| Nov 14, 2025 | Oil and Grease | .943 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1359030 | |
| Nov 14, 2025 | pH | 7.64 | SU | Effluent | Qualifying Storm Event | pH_Field | 1359030 | |
| Nov 14, 2025 | Temperature | 17.83 | Degrees C | Effluent | Qualifying Storm Event | A2550B | 1359030 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | 11.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359030 | |
| Nov 14, 2025 | Zinc, Total | .232 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1359030 | |
| Oct 14, 2025 | Chemical Oxygen Demand (COD) | 29.7 | mg/L | Effluent | Qualifying Storm Event | E410.4 | 1355065 | |
| Oct 14, 2025 | Copper, Total | .0173 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355065 | |
| Oct 14, 2025 | Iron, Total | .000922 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1355065 | |
| Oct 14, 2025 | Lead, Total | .00646 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355065 | |
| Oct 14, 2025 | Oil and Grease | .638 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355065 | |
| Oct 14, 2025 | pH | 7.31 | SU | Effluent | Qualifying Storm Event | pH_Field | 1355065 | |
| Oct 14, 2025 | Temperature | 18.3333 | Degrees C | Effluent | Qualifying Storm Event | A2550B | 1355065 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 9.6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355065 | |
| Oct 14, 2025 | Zinc, Total | .297 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355065 | |
| Mar 13, 2025 | Chemical Oxygen Demand (COD) | 26.2 | mg/L | Effluent | Qualifying Storm Event | E410.4 | 1331717 | |
| Mar 13, 2025 | Copper, Total | .00867 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331717 | |
| Mar 13, 2025 | Iron, Total | .602 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1331717 | |
| Mar 13, 2025 | Lead, Total | .00322 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1331717 | |
| Mar 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1331717 |
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 | 6 | 6 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Sep 21, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 4 | 4 issued · 0 draft · 0 withdrawn, rescinded or superseded | Apr 22, 2002 – Sep 21, 2026 | Oct 21, 2026 | All actions |
| Inspections | 3 | inspections, not findings | Mar 26, 2002 – May 11, 2015 | Oct 21, 2026 | All inspections |
| Annual reports | 10 | certified reports (contents not shown) | 2015 – 2025 | Oct 21, 2026 | All reports |
| Water-quality-based corrective action reports | 0 | reports, by parameter | — | Oct 21, 2026 |
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 (23 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Sep 21, 2026 | Enforcement actions | 473346 | EPL (Expedited Payment Letter) | Active | R4-2026-0255 |
| Sep 21, 2026 | Violations | 907285 | Late Report | Violation | Report |
| Jul 15, 2026 | Annual reports | 1334040 | Annual report 2025 | — | |
| Jul 09, 2024 | Annual reports | 1241801 | Annual report 2023 | — | |
| Jun 05, 2023 | Annual reports | 1187723 | Annual report 2022 | — | |
| Feb 06, 2023 | Enforcement actions | 449432 | NOV (Notice of Violation) | Historical | |
| Feb 06, 2023 | Violations | 884495 | Late Report | Violation | Report |
| Jul 11, 2022 | Annual reports | 1110978 | Annual report 2021 | — | |
| Jul 01, 2021 | Annual reports | 1066906 | Annual report 2020 | — | |
| Jul 07, 2020 | Annual reports | 984052 | Annual report 2019 | — | |
| Jul 29, 2019 | Annual reports | 951546 | Annual report 2018 | — | |
| Jun 20, 2018 | Annual reports | 936953 | Annual report 2017 | — | |
| Jun 12, 2017 | Annual reports | 876096 | Annual report 2016 | — | |
| Jun 22, 2016 | Annual reports | 840898 | Annual report 2015 | — | |
| May 11, 2015 | Enforcement actions | 419525 | NTC (Notice to Comply) | Historical | |
| May 11, 2015 | Inspections | 2025775 | B Type compliance | — | Additional Info Required |
| May 11, 2015 | Violations | 857306 | Incomplete/Insufficient SWPPP | Violation | Inspection |
| May 11, 2015 | Violations | 857307 | Deficient BMP Implementation | Violation | Inspection |
| May 08, 2002 | Inspections | 1734153 | Enforcement Follow-up | — | |
| Apr 22, 2002 | Enforcement actions | 242204 | NOV (Notice of Violation) | Historical | UNKNOWN |
| Mar 26, 2002 | Inspections | 1734152 | B Type compliance | — | Additional Info Required |
| Mar 26, 2002 | Violations | 205253 | Deficient BMP Implementation | Violation | Inspection |
| Jul 02, 1999 | Violations | 154368 | Deficient Report | Violation | Inspection |
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.