MillworX Precision Machining Inc
Active WDID 8 33I027347 Corona, Riverside County Region 8 · Santa Ana
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Corona, Riverside County
- Region 8 · Santa Ana · Location · Statewide map
- Receiving water
- Santa Ana River (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
- 2 waterbodies; 2 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 96 distinct results, 6 reporting years (2018 to 2024)
- Most recent sample Feb 13, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 2 violation records · 2 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
- 33.88792, -117.57124
- 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
- 506 Malloy Court, Corona 92880
- Regional Water Board
- 8 — Santa Ana
HUC12 watershed Evidence: spatial
- Lake Norconian-Temescal Wash HUC12 180702030606
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
- MillworX Precision Machining Inc
- Primary industry (SIC)
- 3499-Fabricated Metal Products, NEC
- Application ID
- 490242
- NOI processed
- Sep 15, 2017
- Last certified
- Apr 09, 2025
- Facility size
- 45250 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 490242 | Industrial | Active | Sep 15, 2017 | — | Apr 09, 2025 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Santa Ana River
- 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
6 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.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| Temescal Creek, Reach 1a CAR8012500020160915056358 | 393 m | listed | 4 |
| Prado Basin Management Zone CAW8012100019991014103600 | 586 m | listed | 1 |
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.
96 distinct measurements across 8 parameters, most recent sample Feb 13, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2024 | 8 | 8 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 16 | 8 | 0 | Jan 22, 2024 | Feb 05, 2024 |
| 2022 | 24 | 6 | 0 | Dec 12, 2022 | Mar 01, 2023 |
| 2021 | 18 | 6 | 0 | Dec 14, 2021 | Mar 28, 2022 |
| 2019 | 18 | 6 | 0 | Nov 27, 2019 | Mar 10, 2020 |
| 2018 | 12 | 6 | 0 | Jan 31, 2019 | May 16, 2019 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total | mg/L | 15 | 3 | Jan 31, 2019 | Feb 13, 2025 | Results |
| Chromium (Total) | mg/L | 15 | 7 | Jan 31, 2019 | Feb 13, 2025 | Results |
| Iron, Total | mg/L | 15 | 1 | Jan 31, 2019 | Feb 13, 2025 | Results |
| Oil and Grease | mg/L | 15 | 8 | Jan 31, 2019 | Feb 13, 2025 | Results |
| pH | SU | 15 | 0 | Jan 31, 2019 | Feb 13, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 15 | 0 | Jan 31, 2019 | Feb 13, 2025 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 3 | 0 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Zinc, Total | mg/L | 3 | 1 | Jan 22, 2024 | Feb 13, 2025 | Results |
All results (96 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 13, 2025 | Aluminum, Total | DNQ .0183 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328713 | |
| Feb 13, 2025 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328713 | |
| Feb 13, 2025 | Iron, Total | .817 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1328713 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .292 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1328713 | |
| Feb 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1328713 | |
| Feb 13, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1328713 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 22.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328713 | |
| Feb 13, 2025 | Zinc, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328713 | |
| Feb 05, 2024 | Aluminum, Total | .0998 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281045 | |
| Feb 05, 2024 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281045 | |
| Feb 05, 2024 | Iron, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1281045 | |
| Feb 05, 2024 | Nitrite Plus Nitrate (as N) | 7.61 | mg/L | Effluent | Qualifying Storm Event | E300.0 | 1281045 | |
| Feb 05, 2024 | Oil and Grease | DNQ 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1281045 | |
| Feb 05, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1281045 | |
| Feb 05, 2024 | Total Suspended Solids (TSS) | 6.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1281045 | |
| Feb 05, 2024 | Zinc, Total | .0365 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281045 | |
| Jan 22, 2024 | Aluminum, Total | .322 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | Chromium (Total) | DNQ .0013 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | Iron, Total | .442 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | Nitrite Plus Nitrate (as N) | .313 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | Oil and Grease | DNQ 1.6 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | pH | 6 | SU | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | Total Suspended Solids (TSS) | 9.9 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Jan 22, 2024 | Zinc, Total | .0908 | mg/L | Effluent | Qualifying Storm Event | 1281035 | ||
| Mar 01, 2023 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241517 | |
| Mar 01, 2023 | Chromium (Total) | .00426 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241517 | |
| Mar 01, 2023 | Iron, Total | 1.17 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1241517 | |
| Mar 01, 2023 | Oil and Grease | 11.2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1241517 | |
| Mar 01, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1241517 | |
| Mar 01, 2023 | Total Suspended Solids (TSS) | 30.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1241517 | |
| Jan 10, 2023 | Aluminum, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241515 | |
| Jan 10, 2023 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241515 | |
| Jan 10, 2023 | Iron, Total | .139 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1241515 | |
| Jan 10, 2023 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1241515 | |
| Jan 10, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1241515 | |
| Jan 10, 2023 | Total Suspended Solids (TSS) | 2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1241515 | |
| Jan 05, 2023 | Aluminum, Total | .472 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241510 | |
| Jan 05, 2023 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241510 | |
| Jan 05, 2023 | Iron, Total | .838 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1241510 | |
| Jan 05, 2023 | Oil and Grease | 2.3 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1241510 | |
| Jan 05, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1241510 | |
| Jan 05, 2023 | Total Suspended Solids (TSS) | 27 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1241510 | |
| Dec 12, 2022 | Aluminum, Total | .656 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241507 | |
| Dec 12, 2022 | Chromium (Total) | .00194 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1241507 | |
| Dec 12, 2022 | Iron, Total | .584 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1241507 | |
| Dec 12, 2022 | Oil and Grease | 1.6 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1241507 | |
| Dec 12, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1241507 | |
| Dec 12, 2022 | Total Suspended Solids (TSS) | 19.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1241507 | |
| Mar 28, 2022 | Aluminum, Total | .24 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1198942 | |
| Mar 28, 2022 | Chromium (Total) | .0011 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1198942 |
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 | 2 | 2 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 16, 2020 – Nov 01, 2023 | Oct 21, 2026 | All violations |
| Enforcement actions | 2 | 2 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 17, 2020 – Nov 01, 2023 | Oct 21, 2026 | All actions |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| Annual reports | 9 | certified reports (contents not shown) | 2017 – 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 (13 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 14, 2026 | Annual reports | 1339676 | Annual report 2025 | — | |
| Jul 09, 2025 | Annual reports | 1298749 | Annual report 2024 | — | |
| Jul 03, 2024 | Annual reports | 1248049 | Annual report 2023 | — | |
| Nov 01, 2023 | Enforcement actions | 451560 | NOV (Notice of Violation) | Historical | |
| Nov 01, 2023 | Violations | 886663 | Failure to Obtain Permit | Violation | Inspection |
| Jul 14, 2023 | Annual reports | 1194281 | Annual report 2022 | — | |
| Jul 13, 2022 | Annual reports | 1118209 | Annual report 2021 | — | |
| Jul 15, 2021 | Annual reports | 1066483 | Annual report 2020 | — | |
| Aug 20, 2020 | Annual reports | 983619 | Annual report 2019 | — | |
| Aug 17, 2020 | Enforcement actions | 437215 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 16, 2020 | Violations | 873656 | Late Report | Violation | Report |
| Jul 10, 2019 | Annual reports | 979584 | Annual report 2018 | — | |
| Jul 13, 2018 | Annual reports | 975180 | Annual report 2017 | — |
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.