INWESCO INCORPORATED
Terminated WDID 4 19NEC006244 Azusa, Los Angeles County Region 4 · Los Angeles
At a glance
- Permit Evidence: SMARTS record
- Terminated Industrial
- No Exposure Certification (NEC) · Permits and applications
- Location Evidence: facility-reported
- Azusa, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Walnut Creek Wash (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
- 104 distinct results, 3 reporting years (2020 to 2022)
- Most recent sample Mar 21, 2023 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 1 violation record · 0 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
- 34.13522, -117.92119
- Precision
- 5 decimal places
- Shared point
- 3 permits report this exact point
- Matches application record
- same
Facility location as reported by the discharger in SMARTS; not a discharge point or outfall.
- Facility address
- 746 NORTH CONEY AVE 746 NORTH CONEY AVE, Azusa 91702
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Big Dalton Wash HUC12 180701060402
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
- No Exposure Certification (NEC)
- Status
- Terminated
- Operator
- INWESCO INCORPORATED
- Primary industry (SIC)
- 3441-Fabricated Structural Metal
- Application ID
- 517559
- NOI processed
- Mar 04, 2020
- Last certified
- Aug 04, 2020
- Facility size
- 22000 SqFt
- Impervious area
- 0 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 517559 | Industrial | Terminated | Mar 04, 2020 | — | Aug 04, 2020 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Walnut Creek Wash
- Discharges directly / indirectly
- Y / N (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
1 official waterbody shares 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
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.
104 distinct measurements across 8 parameters, most recent sample Mar 21, 2023.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2022 | 48 | 8 | 0 | Nov 08, 2022 | Mar 21, 2023 |
| 2021 | 28 | 7 | 0 | Oct 26, 2021 | Dec 09, 2021 |
| 2020 | 28 | 7 | 0 | Dec 28, 2020 | Mar 15, 2021 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Aluminum, Total Recoverable | mg/L | 15 | 0 | Dec 28, 2020 | Mar 21, 2023 | Results |
| Iron, Total Recoverable | mg/L | 15 | 0 | Dec 28, 2020 | Mar 21, 2023 | Results |
| Oil and Grease | mg/L | 15 | 3 | Dec 28, 2020 | Mar 21, 2023 | Results |
| Total Suspended Solids (TSS) | mg/L | 15 | 0 | Dec 28, 2020 | Mar 21, 2023 | Results |
| Zinc, Total Recoverable | mg/L | 15 | 0 | Dec 28, 2020 | Mar 21, 2023 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 14 | 2 | Dec 28, 2020 | Mar 21, 2023 | Results |
| pH | SU | 14 | 0 | Dec 28, 2020 | Mar 21, 2023 | Results |
| Lead, Total Recoverable | mg/L | 1 | 0 | Nov 08, 2022 | Nov 08, 2022 | Results |
All results (104 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Mar 21, 2023 | Aluminum, Total Recoverable | .14 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1235377 | |
| Mar 21, 2023 | Iron, Total Recoverable | .54 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1235377 | |
| Mar 21, 2023 | Nitrite Plus Nitrate (as N) | .13 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1235377 | |
| Mar 21, 2023 | Oil and Grease | 6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1235377 | |
| Mar 21, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1235377 | |
| Mar 21, 2023 | Total Suspended Solids (TSS) | 6.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1235377 | |
| Mar 21, 2023 | Zinc, Total Recoverable | .28 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1235377 | |
| Mar 10, 2023 | Aluminum, Total Recoverable | .14 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1235375 | |
| Mar 10, 2023 | Iron, Total Recoverable | .56 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1235375 | |
| Mar 10, 2023 | Nitrite Plus Nitrate (as N) | .055 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1235375 | |
| Mar 10, 2023 | Oil and Grease | ND 3.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1235375 | |
| Mar 10, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1235375 | |
| Mar 10, 2023 | Total Suspended Solids (TSS) | 13 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1235375 | |
| Mar 10, 2023 | Zinc, Total Recoverable | .72 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1235375 | |
| Feb 24, 2023 | Aluminum, Total Recoverable | .2 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1233706 | |
| Feb 24, 2023 | Iron, Total Recoverable | .56 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1233706 | |
| Feb 24, 2023 | Nitrite Plus Nitrate (as N) | .087 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1233706 | |
| Feb 24, 2023 | Oil and Grease | ND 2.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1233706 | |
| Feb 24, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1233706 | |
| Feb 24, 2023 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1233706 | |
| Feb 24, 2023 | Zinc, Total Recoverable | .61 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1233706 | |
| Jan 10, 2023 | Aluminum, Total Recoverable | .42 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1228160 | |
| Jan 10, 2023 | Iron, Total Recoverable | .92 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1228160 | |
| Jan 10, 2023 | Nitrite Plus Nitrate (as N) | .058 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1228160 | |
| Jan 10, 2023 | Oil and Grease | 8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1228160 | |
| Jan 10, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1228160 | |
| Jan 10, 2023 | Total Suspended Solids (TSS) | 7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1228160 | |
| Jan 10, 2023 | Zinc, Total Recoverable | 1 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1228160 | |
| Jan 05, 2023 | Aluminum, Total Recoverable | .42 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1226588 | |
| Jan 05, 2023 | Iron, Total Recoverable | 1.7 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1226588 | |
| Jan 05, 2023 | Nitrite Plus Nitrate (as N) | .045 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1226588 | |
| Jan 05, 2023 | Oil and Grease | 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1226588 | |
| Jan 05, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1226588 | |
| Jan 05, 2023 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1226588 | |
| Jan 05, 2023 | Zinc, Total Recoverable | 1.3 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1226588 | |
| Dec 12, 2022 | Aluminum, Total Recoverable | .15 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1226586 | |
| Dec 12, 2022 | Iron, Total Recoverable | .28 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1226586 | |
| Dec 12, 2022 | Nitrite Plus Nitrate (as N) | ND .04 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1226586 | |
| Dec 12, 2022 | Oil and Grease | 14 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1226586 | |
| Dec 12, 2022 | Total Suspended Solids (TSS) | 3.7 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1226586 | |
| Dec 12, 2022 | Zinc, Total Recoverable | .78 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1226586 | |
| Nov 08, 2022 | Aluminum, Total Recoverable | .22 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1220853 | |
| Nov 08, 2022 | Iron, Total Recoverable | .78 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1220853 | |
| Nov 08, 2022 | Lead, Total Recoverable | .004 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1220853 | |
| Nov 08, 2022 | Oil and Grease | ND 2.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1220853 | |
| Nov 08, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1220853 | |
| Nov 08, 2022 | Total Suspended Solids (TSS) | 5.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1220853 | |
| Nov 08, 2022 | Zinc, Total Recoverable | .26 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1220853 | |
| Dec 09, 2021 | Aluminum, Total Recoverable | 3.1 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1175122 | |
| Dec 09, 2021 | Aluminum, Total Recoverable | .74 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1175122 |
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 | 1 | 1 Violation · 0 Potential (preliminary) · 0 Dismissed | Feb 06, 2023 – Feb 06, 2023 | Oct 21, 2026 | All violations |
| Enforcement actions | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 1 | inspections, not findings | Sep 30, 2021 – Sep 30, 2021 | Oct 21, 2026 | All inspections |
| Annual reports | 3 | certified reports (contents not shown) | 2020 – 2022 | 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 (5 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 21, 2023 | Annual reports | 1194445 | Annual report 2022 | — | |
| Feb 06, 2023 | Violations | 884470 | Late Report | Violation | Report |
| Jun 06, 2022 | Annual reports | 1169694 | Annual report 2021 | — | |
| Sep 30, 2021 | Inspections | 2054880 | B Type compliance | Finalized | No Further Action |
| Jun 28, 2021 | Annual reports | 1141869 | Annual report 2020 | — |
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.