Acorn Engineering Co
Active WDID 4 19I002113 City Of Industry, 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
- City Of Industry, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- San Gabriel 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
- 662 distinct results, 9 reporting years (2016 to 2025)
- Most recent sample Feb 19, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 3 inspections · 10 violation records · 9 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
- 34.025693, -117.968445
- 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
- Bldg 1 15125 Proctor, City Of Industry 91746
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Lower San Jose Creek HUC12 180701060502
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
- Acorn Engineering Co
- Primary industry (SIC)
- 3432-Plumbing Fixture Fittings and Trim
- Secondary SIC
- 3431-Enameled Iron and Metal Sanitary Ware
- Application ID
- 188896
- NOI processed
- Mar 30, 1992
- Last certified
- Jul 29, 2015
- Facility size
- 323000 SqFt
- Impervious area
- 5 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 188896 | Industrial | Active | Mar 30, 1992 | — | Jul 29, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Gabriel 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
10 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 |
|---|---|---|---|
| Puente Creek CAR4053100020081117111726 | 473 m | listed | 2 |
| San Jose Creek Reach 1 (SG Confluence to Temple St.) CAR4053100019980918090950 | 621 m | listed | 5 |
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.
662 distinct measurements across 14 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 | 64 | 8 | 0 | Oct 14, 2025 | Feb 19, 2026 |
| 2024 | 64 | 8 | 0 | Feb 07, 2025 | Feb 13, 2025 |
| 2023 | 124 | 8 | 0 | Jan 22, 2024 | Feb 20, 2024 |
| 2022 | 128 | 8 | 0 | Nov 08, 2022 | Mar 21, 2023 |
| 2021 | 56 | 7 | 0 | Oct 25, 2021 | Mar 28, 2022 |
| 2020 | 20 | 10 | 0 | Mar 03, 2021 | Mar 03, 2021 |
| 2019 | 36 | 9 | 0 | Mar 12, 2020 | Mar 12, 2020 |
| 2018 | 38 | 10 | 0 | Nov 29, 2018 | Mar 06, 2019 |
| 2016 | 132 | 11 | 0 | May 06, 2016 | Dec 16, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 78 | 32 | May 06, 2016 | Feb 19, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 78 | 18 | May 06, 2016 | Feb 19, 2026 | Results |
| pH | SU | 76 | 0 | May 06, 2016 | Feb 19, 2026 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 74 | 0 | May 06, 2016 | Feb 19, 2026 | Results |
| Aluminum, Total | mg/L | 70 | 0 | May 06, 2016 | Feb 19, 2026 | Results |
| Copper, Total | mg/L | 70 | 0 | May 06, 2016 | Feb 19, 2026 | Results |
| Iron, Total | mg/L | 70 | 0 | May 06, 2016 | Feb 19, 2026 | Results |
| Zinc, Total | mg/L | 70 | 0 | May 06, 2016 | Feb 19, 2026 | Results |
| Lead, Total | mg/L | 22 | 1 | May 06, 2016 | Mar 03, 2021 | Results |
| Phosphorus, Total (as P) | mg/L | 18 | 0 | May 06, 2016 | Mar 03, 2021 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 12 | 0 | May 06, 2016 | Dec 16, 2016 | Results |
| Aluminum, Total Recoverable | mg/L | 8 | 0 | Oct 25, 2021 | Mar 28, 2022 | Results |
Show 2 more parameters
All results (662 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 19, 2026 | Aluminum, Total | .064 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Aluminum, Total | .06 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Aluminum, Total | .05 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Aluminum, Total | .056 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Copper, Total | .0049 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Copper, Total | .0049 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Copper, Total | .0046 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Copper, Total | .0057 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Iron, Total | .082 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1371214 | |
| Feb 19, 2026 | Iron, Total | .074 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1371214 | |
| Feb 19, 2026 | Iron, Total | .065 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1371214 | |
| Feb 19, 2026 | Iron, Total | .067 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1371214 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .11 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1371214 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .11 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1371214 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .1 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1371214 | |
| Feb 19, 2026 | Nitrite Plus Nitrate (as N) | .1 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1371214 | |
| Feb 19, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1371214 | |
| Feb 19, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1371214 | |
| Feb 19, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1371214 | |
| Feb 19, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1371214 | |
| Feb 19, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1371214 | |
| Feb 19, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1371214 | |
| Feb 19, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1371214 | |
| Feb 19, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1371214 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371214 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371214 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371214 | |
| Feb 19, 2026 | Total Suspended Solids (TSS) | ND | mg/L | Effluent | Qualifying Storm Event | A2540D | 1371214 | |
| Feb 19, 2026 | Zinc, Total | .041 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Zinc, Total | .041 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Zinc, Total | .038 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Feb 19, 2026 | Zinc, Total | .04 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1371214 | |
| Oct 14, 2025 | Aluminum, Total | 1.6 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Aluminum, Total | 2.6 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Aluminum, Total | 2.3 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Aluminum, Total | 2.6 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Copper, Total | .017 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Copper, Total | .03 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Copper, Total | .027 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Copper, Total | .029 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1358100 | |
| Oct 14, 2025 | Iron, Total | .86 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1358100 | |
| Oct 14, 2025 | Iron, Total | 1.5 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1358100 | |
| Oct 14, 2025 | Iron, Total | 1.4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1358100 | |
| Oct 14, 2025 | Iron, Total | 1.6 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1358100 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .37 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1358100 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .37 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1358100 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .36 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1358100 | |
| Oct 14, 2025 | Nitrite Plus Nitrate (as N) | .36 | mg/L | Effluent | Qualifying Storm Event | E353.2 | 1358100 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1358100 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1358100 |
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 | 10 | 10 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Apr 19, 2021 | Oct 21, 2026 | All violations |
| Enforcement actions | 9 | 9 issued · 0 draft · 0 withdrawn, rescinded or superseded | Oct 26, 1999 – Apr 10, 2024 | Oct 21, 2026 | All actions |
| Inspections | 3 | inspections, not findings | Feb 07, 2002 – May 15, 2015 | 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 (33 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 06, 2026 | Annual reports | 1334186 | Annual report 2025 | — | |
| Jul 03, 2025 | Annual reports | 1292956 | Annual report 2024 | — | |
| Jul 11, 2024 | Annual reports | 1241959 | Annual report 2023 | — | |
| Apr 10, 2024 | Enforcement actions | 453220 | ACL (Administrative Civil Liability) | Historical | R4-2024-0038 |
| Jun 23, 2023 | Annual reports | 1187888 | Annual report 2022 | — | |
| Jun 23, 2022 | Annual reports | 1111152 | Annual report 2021 | — | |
| Jul 15, 2021 | Annual reports | 1067087 | Annual report 2020 | — | |
| Apr 19, 2021 | Violations | 888864 | Late Report | Violation | Report |
| Apr 09, 2021 | Enforcement actions | 440456 | NOV (Notice of Violation) | Historical | |
| Apr 09, 2021 | Violations | 876726 | Incomplete/Insufficient SWPPP | Violation | Report |
| Aug 14, 2020 | Enforcement actions | 437245 | NOV (Notice of Violation) | Historical | |
| Jul 13, 2020 | Annual reports | 984242 | Annual report 2019 | — | |
| Feb 19, 2020 | Enforcement actions | 436303 | NOV (Notice of Violation) | Historical | |
| Feb 19, 2020 | Violations | 872709 | Late Report | Violation | Report |
| Jul 10, 2019 | Annual reports | 951745 | Annual report 2018 | — | |
| Jun 29, 2018 | Annual reports | 937155 | Annual report 2017 | — | |
| Jul 13, 2017 | Annual reports | 876304 | Annual report 2016 | — | |
| Sep 30, 2016 | Annual reports | 840193 | Annual report 2015 | — | |
| May 15, 2015 | Enforcement actions | 419524 | NTC (Notice to Comply) | Historical | |
| May 15, 2015 | Inspections | 2025774 | B Type compliance | — | Additional Info Required |
| May 15, 2015 | Violations | 857305 | Deficient BMP Implementation | Violation | Inspection |
| Dec 08, 2010 | Enforcement actions | 404596 | SEL (Staff Enforcement Letter) | Historical | |
| Feb 05, 2009 | Violations | 843707 | Deficient BMP Implementation | Violation | Report |
| Oct 20, 2004 | Enforcement actions | 254174 | NOV (Notice of Violation) | Historical | NOV |
| Oct 12, 2004 | Inspections | 1734266 | B Type compliance | — | Additional Info Required |
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.