Engineered Polymer Solutions
Active WDID 4 19I027673 Los Angeles, 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
- Los Angeles, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Los Angeles 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
- 1 waterbody; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 128 distinct results, 8 reporting years (2018 to 2025)
- Most recent sample Apr 01, 2026 · 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
- 33.98668, -118.16668
- 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
- 5501 E Slauson Avenue 101 West Prospect Avenue, Los Angeles 90040
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Chavez Ravine-Los Angeles River HUC12 180701050401
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
- The Sherwin Williams Manufacturing Company
- Primary industry (SIC)
- 2821-Plastics Material and Synthetic Resins, and Nonvulcanizable Elastomers
- Secondary SIC
- 2851-Paints, Varnishes, Lacquers, Enamels, and Allied Products
- Application ID
- 493895
- NOI processed
- Apr 04, 2018
- Last certified
- Apr 04, 2018
- Facility size
- 4 Acres
- Impervious area
- 99 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 493895 | Industrial | Active | Apr 04, 2018 | — | Apr 04, 2018 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Los Angeles River
- 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
7 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 |
|---|---|---|---|
| Los Angeles River Reach 2 (Carson to Figueroa Street) CAR4051501019990202085021 | 431 m | listed | 9 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
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 |
|---|---|---|---|---|---|---|---|
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Zinc, Total | .159 mg/L | NEL instantaneous | FINAL | 2020-07-01 | 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.
128 distinct measurements across 4 parameters, most recent sample Apr 01, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 16 | 4 | 0 | Oct 14, 2025 | Apr 01, 2026 |
| 2024 | 12 | 4 | 0 | Jan 30, 2025 | Mar 13, 2025 |
| 2023 | 16 | 4 | 0 | Nov 15, 2023 | Feb 04, 2024 |
| 2022 | 20 | 4 | 0 | Nov 08, 2022 | Jan 10, 2023 |
| 2021 | 12 | 4 | 0 | Dec 28, 2021 | Apr 22, 2022 |
| 2020 | 12 | 4 | 0 | Dec 28, 2020 | Mar 25, 2021 |
| 2019 | 16 | 4 | 0 | Nov 27, 2019 | Mar 12, 2020 |
| 2018 | 24 | 4 | 0 | Nov 29, 2018 | May 16, 2019 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| pH | SU | 33 | 0 | Nov 29, 2018 | Apr 01, 2026 | Results |
| Oil and Grease | mg/L | 32 | 8 | Nov 29, 2018 | Apr 01, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 32 | 1 | Nov 29, 2018 | Apr 01, 2026 | Results |
| Zinc, Total | mg/L | 31 | 0 | Nov 29, 2018 | Apr 01, 2026 | Results |
All results (128 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Apr 01, 2026 | Oil and Grease | 2.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1373552 | |
| Apr 01, 2026 | Oil and Grease | 2.4 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1373554 | |
| Apr 01, 2026 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1373552 | |
| Apr 01, 2026 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1373554 | |
| Apr 01, 2026 | pH | 7.4 | SU | Effluent | Qualifying Storm Event | pH_Field | 1373604 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 36 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1373552 | |
| Apr 01, 2026 | Total Suspended Solids (TSS) | 36 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1373554 | |
| Apr 01, 2026 | Zinc, Total | .0291 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1373604 | |
| Nov 18, 2025 | Oil and Grease | 5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1359831 | |
| Nov 18, 2025 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1359831 | |
| Nov 18, 2025 | Total Suspended Solids (TSS) | 115 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1359831 | |
| Nov 18, 2025 | Zinc, Total | .959 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1359831 | |
| Oct 14, 2025 | Oil and Grease | .9 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360361 | |
| Oct 14, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360361 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 5.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360361 | |
| Oct 14, 2025 | Zinc, Total | 2.09 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1360361 | |
| Mar 13, 2025 | Oil and Grease | .8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1330200 | |
| Mar 13, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1330200 | |
| Mar 13, 2025 | Total Suspended Solids (TSS) | 1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1330200 | |
| Mar 13, 2025 | Zinc, Total | .0126 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330200 | |
| Mar 05, 2025 | Oil and Grease | .8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1330199 | |
| Mar 05, 2025 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1330199 | |
| Mar 05, 2025 | Total Suspended Solids (TSS) | 23.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1330199 | |
| Mar 05, 2025 | Zinc, Total | .882 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330199 | |
| Jan 30, 2025 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1330513 | |
| Jan 30, 2025 | pH | 7.1 | SU | Effluent | Qualifying Storm Event | pH_Field | 1330513 | |
| Jan 30, 2025 | Total Suspended Solids (TSS) | 84.1 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1330513 | |
| Jan 30, 2025 | Zinc, Total | 2.74 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1330513 | |
| Feb 04, 2024 | Oil and Grease | < 5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1281610 | |
| Feb 04, 2024 | pH | 7.9 | SU | Effluent | Qualifying Storm Event | pH_Field | 1281610 | |
| Feb 04, 2024 | Total Suspended Solids (TSS) | 3.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1281610 | |
| Feb 04, 2024 | Zinc, Total | .392 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1281610 | |
| Jan 22, 2024 | Oil and Grease | < 5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1278372 | |
| Jan 22, 2024 | pH | 7.2 | SU | Effluent | Qualifying Storm Event | pH_Field | 1278372 | |
| Jan 22, 2024 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1278372 | |
| Jan 22, 2024 | Zinc, Total | .0423 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1278372 | |
| Dec 20, 2023 | Oil and Grease | < 5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1278380 | |
| Dec 20, 2023 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1278380 | |
| Dec 20, 2023 | Total Suspended Solids (TSS) | 9.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1278380 | |
| Dec 20, 2023 | Zinc, Total | .0331 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1278380 | |
| Nov 15, 2023 | Oil and Grease | 5 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1268300 | |
| Nov 15, 2023 | pH | 6.97 | SU | Effluent | Qualifying Storm Event | pH_Field | 1268300 | |
| Nov 15, 2023 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1268300 | |
| Nov 15, 2023 | Zinc, Total | .0174 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1268300 | |
| Jan 10, 2023 | Oil and Grease | .8 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1237156 | |
| Jan 10, 2023 | pH | 7.05 | SU | Effluent | Qualifying Storm Event | pH_Field | 1237156 | |
| Jan 10, 2023 | Total Suspended Solids (TSS) | 12.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1237156 | |
| Jan 10, 2023 | Zinc, Total | .994 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1237156 | |
| Jan 04, 2023 | Oil and Grease | 7.9 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1237126 | |
| Jan 04, 2023 | Oil and Grease | 7.9 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1268292 |
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 | 1 Violation · 1 Potential (preliminary) · 0 Dismissed | Aug 17, 2021 – Jul 07, 2022 | Oct 21, 2026 | All violations |
| Enforcement actions | 2 | 2 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 17, 2021 – Jul 07, 2022 | 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 | 2 | reports, by parameter | 2020-21 – 2021-22 | Oct 21, 2026 | All reports |
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 (15 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 09, 2026 | Annual reports | 1340632 | Annual report 2025 | — | |
| Jun 16, 2025 | Annual reports | 1299781 | Annual report 2024 | — | |
| Jun 10, 2024 | Annual reports | 1249153 | Annual report 2023 | — | |
| Jun 23, 2023 | Annual reports | 1195458 | Annual report 2022 | — | |
| Aug 31, 2022 | Water-quality-based corrective action reports | 1204121 | WQBCAR 2020-21 | — | Zinc, Total |
| Jul 08, 2022 | Annual reports | 1119036 | Annual report 2021 | — | |
| Jul 07, 2022 | Enforcement actions | 446817 | ACL (Administrative Civil Liability) | Historical | R4-2022-0203 |
| Jul 07, 2022 | Violations | 882088 | Effluent | Violation | Report |
| Aug 17, 2021 | Enforcement actions | 441412 | TSO (Time Schedule Order) | Active | R4-2021-0020-A03 |
| Aug 17, 2021 | Violations | 877484 | Effluent | Potential | Internal Report |
| Jul 13, 2021 | Annual reports | 1071345 | Annual report 2020 | — | |
| Jul 15, 2020 | Annual reports | 1004174 | Annual report 2019 | — | |
| Jul 15, 2019 | Annual reports | 1003886 | Annual report 2018 | — | |
| Jul 13, 2018 | Annual reports | 996707 | Annual report 2017 | — | |
| — | Water-quality-based corrective action reports | 1288717 | WQBCAR 2021-22 | — | Zinc, Total |
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.