Mills Iron Works
Active WDID 4 19I006665 Rosewood, 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
- Rosewood, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Pacific Ocean (as reported by the facility)
- Evidence: candidate, awaiting review Details
- 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
- None
- Monitoring results Evidence: facility-reported
- 266 distinct results, 11 reporting years (2015 to 2025)
- Most recent sample Dec 24, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 6 violation records · 5 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
- 33.89725, -118.27173
- Precision
- 5 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
- 14834 S Maple Ave, Rosewood 90248
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Lower Dominguez Channel HUC12 180701060102
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
- Mills Iron Works
- Primary industry (SIC)
- 3494-Valves and Pipe Fittings, NEC
- Application ID
- 189640
- NOI processed
- Jul 09, 1993
- Last certified
- Dec 28, 2018
- Facility size
- 5 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 189640 | Industrial | Active | Jul 09, 1993 | — | Dec 28, 2018 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Pacific Ocean
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: not confirmed Evidence: candidate, awaiting review Awaiting review
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
Why it is not confirmed (1)
- C1 name is only a prefix of official names
290 official waterbodies share this name; none is assigned without review.
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 |
|---|---|---|---|---|---|---|---|
| R4 - Los Angeles and Long Beach Harbor Waters TMDL | Dominguez Channel Estuary | Zinc, Total | .095 mg/L | TMDL NAL instantaneous | FINAL | 2032-05-05 | Y |
1 record. 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.
266 distinct measurements across 13 parameters, most recent sample Dec 24, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 32 | 8 | 0 | Oct 14, 2025 | Dec 24, 2025 |
| 2024 | 40 | 8 | 0 | Feb 05, 2025 | Mar 31, 2025 |
| 2023 | 47 | 8 | 0 | Dec 20, 2023 | Apr 16, 2024 |
| 2022 | 25 | 10 | 0 | Nov 08, 2022 | Mar 29, 2023 |
| 2021 | 20 | 7 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 21 | 7 | 0 | Jan 29, 2021 | Mar 15, 2021 |
| 2019 | 28 | 7 | 0 | Nov 20, 2019 | Mar 23, 2020 |
| 2018 | 28 | 7 | 0 | Nov 29, 2018 | Feb 14, 2019 |
| 2017 | 7 | 7 | 0 | Jan 09, 2018 | Jan 09, 2018 |
| 2016 | 12 | 3 | 0 | Nov 17, 2016 | Jan 09, 2017 |
| 2015 | 6 | 3 | 0 | Nov 25, 2015 | Jan 05, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 39 | 30 | Nov 25, 2015 | Dec 24, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 39 | 2 | Nov 25, 2015 | Dec 24, 2025 | Results |
| pH | SU | 37 | 0 | Nov 25, 2015 | Dec 24, 2025 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 32 | 2 | Jan 09, 2018 | Dec 24, 2025 | Results |
| Iron, Total Recoverable | mg/L | 21 | 0 | Oct 25, 2021 | Dec 24, 2025 | Results |
| Aluminum, Total Recoverable | mg/L | 20 | 1 | Oct 25, 2021 | Dec 24, 2025 | Results |
| Zinc, Total Recoverable | mg/L | 20 | 0 | Oct 25, 2021 | Dec 24, 2025 | Results |
| Copper, Total Recoverable | mg/L | 17 | 1 | Nov 08, 2022 | Dec 24, 2025 | Results |
| Aluminum, Total | mg/L | 12 | 0 | Jan 09, 2018 | Mar 15, 2021 | Results |
| Iron, Total | mg/L | 12 | 0 | Jan 09, 2018 | Mar 15, 2021 | Results |
| Zinc, Total | mg/L | 12 | 0 | Jan 09, 2018 | Mar 15, 2021 | Results |
| Ammonia, Total (as N) | mg/L | 3 | 0 | Nov 08, 2022 | Mar 29, 2023 | Results |
Show 1 more parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Lead, Total Recoverable | mg/L | 2 | 0 | Nov 08, 2022 | Mar 29, 2023 | Results |
All results (266 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Dec 24, 2025 | Aluminum, Total Recoverable | .85 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1364271 | |
| Dec 24, 2025 | Copper, Total Recoverable | .00518 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1364271 | |
| Dec 24, 2025 | Iron, Total Recoverable | .86 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1364271 | |
| Dec 24, 2025 | Nitrite Plus Nitrate (as N) | .21 | mg/L | Effluent | Qualifying Storm Event | A4500NOF | 1364271 | |
| Dec 24, 2025 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364271 | |
| Dec 24, 2025 | pH | 8.1 | SU | Effluent | Qualifying Storm Event | A4500HB | 1364271 | |
| Dec 24, 2025 | Total Suspended Solids (TSS) | 5.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364271 | |
| Dec 24, 2025 | Zinc, Total Recoverable | .043 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1364271 | |
| Nov 21, 2025 | Aluminum, Total Recoverable | .91 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1361450 | |
| Nov 21, 2025 | Copper, Total Recoverable | .00698 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1361450 | |
| Nov 21, 2025 | Iron, Total Recoverable | .94 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361450 | |
| Nov 21, 2025 | Nitrite Plus Nitrate (as N) | .26 | mg/L | Effluent | Qualifying Storm Event | A4500NOF | 1361450 | |
| Nov 21, 2025 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361450 | |
| Nov 21, 2025 | pH | 8.8 | SU | Effluent | Qualifying Storm Event | A4500HB | 1361450 | |
| Nov 21, 2025 | Total Suspended Solids (TSS) | 12 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361450 | |
| Nov 21, 2025 | Zinc, Total Recoverable | .042 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1361450 | |
| Nov 14, 2025 | Aluminum, Total Recoverable | ND .02 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1361449 | |
| Nov 14, 2025 | Copper, Total Recoverable | .0268 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1361449 | |
| Nov 14, 2025 | Iron, Total Recoverable | .033 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1361449 | |
| Nov 14, 2025 | Nitrite Plus Nitrate (as N) | .27 | mg/L | Effluent | Qualifying Storm Event | A4500NOF | 1361449 | |
| Nov 14, 2025 | Oil and Grease | ND 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1361449 | |
| Nov 14, 2025 | pH | 8.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1361449 | |
| Nov 14, 2025 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1361449 | |
| Nov 14, 2025 | Zinc, Total Recoverable | .31 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1361449 | |
| Oct 14, 2025 | Aluminum, Total Recoverable | 1.9 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355954 | |
| Oct 14, 2025 | Copper, Total Recoverable | .0175 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355954 | |
| Oct 14, 2025 | Iron, Total Recoverable | 2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1355954 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .32 | mg/L | Effluent | Qualifying Storm Event | A4500NOF | 1355954 | |
| Oct 14, 2025 | Oil and Grease | 5.3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1355954 | |
| Oct 14, 2025 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | A4500HB | 1355954 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 37 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1355954 | |
| Oct 14, 2025 | Zinc, Total Recoverable | .23 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1355954 | |
| Mar 31, 2025 | Aluminum, Total Recoverable | .059 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327834 | |
| Mar 31, 2025 | Copper, Total Recoverable | .00385 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327834 | |
| Mar 31, 2025 | Iron, Total Recoverable | .13 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1327834 | |
| Mar 31, 2025 | Nitrite Plus Nitrate (as N) | .22 | mg/L | Effluent | Qualifying Storm Event | A4500NOF | 1327834 | |
| Mar 31, 2025 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1327834 | |
| Mar 31, 2025 | pH | 7.7 | SU | Effluent | Qualifying Storm Event | A4500HB | 1327834 | |
| Mar 31, 2025 | Total Suspended Solids (TSS) | ND 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1327834 | |
| Mar 31, 2025 | Zinc, Total Recoverable | .015 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1327834 | |
| Mar 13, 2025 | Aluminum, Total Recoverable | .085 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328045 | |
| Mar 13, 2025 | Copper, Total Recoverable | .0045 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328045 | |
| Mar 13, 2025 | Iron, Total Recoverable | .24 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328045 | |
| Mar 13, 2025 | Nitrite Plus Nitrate (as N) | .18 | mg/L | Effluent | Qualifying Storm Event | A4500NOF | 1328045 | |
| Mar 13, 2025 | Oil and Grease | 2.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328045 | |
| Mar 13, 2025 | pH | 6.6 | SU | Effluent | Qualifying Storm Event | A4500HB | 1328045 | |
| Mar 13, 2025 | Total Suspended Solids (TSS) | 3.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328045 | |
| Mar 13, 2025 | Zinc, Total Recoverable | .045 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328045 | |
| Mar 06, 2025 | Aluminum, Total Recoverable | .046 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330324 | |
| Mar 06, 2025 | Copper, Total Recoverable | .00566 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330324 |
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 | 5 Violation · 0 Potential (preliminary) · 1 Dismissed | Apr 10, 2001 – Jun 02, 2022 | Oct 21, 2026 | All violations |
| Enforcement actions | 5 | 4 issued · 0 draft · 1 withdrawn, rescinded or superseded | Apr 13, 2001 – Jun 02, 2022 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Apr 10, 2001 – Apr 10, 2001 | 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 | 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 |
|---|---|---|---|---|---|
| Jun 30, 2026 | Annual reports | 1336793 | Annual report 2025 | — | |
| Jun 27, 2025 | Annual reports | 1295674 | Annual report 2024 | — | |
| Jun 27, 2024 | Annual reports | 1244833 | Annual report 2023 | — | |
| Jul 12, 2023 | Annual reports | 1190908 | Annual report 2022 | — | |
| Jun 23, 2022 | Annual reports | 1114419 | Annual report 2021 | — | |
| Jun 02, 2022 | Enforcement actions | 446604 | NOV (Notice of Violation) | Withdrawn | |
| Jun 02, 2022 | Violations | 881827 | Late Report | Dismissed | Report |
| Jun 03, 2021 | Annual reports | 1070507 | Annual report 2020 | — | |
| Apr 09, 2021 | Enforcement actions | 440459 | NOV (Notice of Violation) | Historical | |
| Apr 09, 2021 | Violations | 876729 | Incomplete/Insufficient SWPPP | Violation | Report |
| Aug 14, 2020 | Enforcement actions | 437233 | NOV (Notice of Violation) | Historical | |
| Jul 30, 2020 | Annual reports | 987902 | Annual report 2019 | — | |
| Dec 16, 2019 | Violations | 873675 | Deficient Report | Violation | Report |
| Jul 08, 2019 | Annual reports | 955529 | Annual report 2018 | — | |
| Jul 09, 2018 | Annual reports | 940950 | Annual report 2017 | — | |
| Jun 05, 2018 | Enforcement actions | 429839 | NOV (Notice of Violation) | Historical | |
| Dec 30, 2017 | Violations | 866963 | Deficient Report | Violation | Report |
| Jun 09, 2017 | Annual reports | 880305 | Annual report 2016 | — | |
| Jul 15, 2016 | Annual reports | 843661 | Annual report 2015 | — | |
| Apr 13, 2001 | Enforcement actions | 235520 | NOV (Notice of Violation) | Historical | UNKNOWN |
| Apr 10, 2001 | Inspections | 1733502 | B Type compliance | — | Additional Info Required |
| Apr 10, 2001 | Violations | 154994 | Deficient BMP Implementation | Violation | Inspection |
| Apr 10, 2001 | Violations | 186054 | Deficient BMP Implementation | 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.