Diamond Mattress Co
Active WDID 4 19I022540 Compton, 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
- Compton, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Compton Creek (as reported by the facility)
- Evidence: identification corroborated Compton Creek Details
- Identified receiving water on the 2026 303(d) list
- Yes · 8 Appendix A decisions, category 5 Evidence: State-published
- Describes the waterbody, not this facility · Waterbody profile
- 2026 Integrated Report waters within 1.0 km Evidence: geographic proximity
- 2 waterbodies; 1 on the 2026 303(d) list
- Proximity only; not a discharge pathway · Nearby waterbodies
- Monitoring results Evidence: facility-reported
- 6 distinct results, 2 reporting years (2017 to 2023)
- Most recent sample Feb 06, 2024 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 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
- 33.86945, -118.20773
- 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
- 3112 E Las Hermanas St, Compton 90221
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Compton Creek-Los Angeles River HUC12 180701050402
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
- Diamond Mattress Co
- Primary industry (SIC)
- 2515-Mattresses, Foundations, and Convertible Beds
- Application ID
- 402310
- NOI processed
- Mar 03, 2010
- Last certified
- Nov 05, 2015
- Facility size
- 120000 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 402310 | Industrial | Active | Mar 03, 2010 | — | Nov 05, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Compton Creek
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: identification corroborated Compton Creek CAR4051501019990202111430
Receiving water reported by facility — waterbody identification corroborated by geographic evidence.
Nearest distance from the reported facility location: 697 m. Method receiving_water/2.
2026 Integrated Report status Evidence: State-published
Compton Creek is on the 2026 Clean Water Act section 303(d) list (8 Appendix A decisions; category 5).
| Pollutant | Category | Listing decision | TMDL requirement | Decision ID |
|---|---|---|---|---|
| Aluminum | 5 | List on 303(d) list (TMDL required list) | 5A | 153906 |
| Benthic Community Effects | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 153905 |
| Copper | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Metals (13) | 89976 |
| Indicator Bacteria | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Pathogens (15) | 150286 |
| Lead | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Metals (13) | 70408 |
| pH | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Nitrogen (11) | 90033 |
| Trash | 5 | List on 303(d) list (being addressed by USEPA approved TMDL) | 5B · Los Angeles River Trash (12) | 70557 |
| Zinc | 5 | Do Not Delist from 303(d) list (being addressed with USEPA approved TMDL) | 5B · Los Angeles River Metals (13) | 138332 |
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. State Board adoption 2026-02-03; USEPA approval not confirmed. A listing describes the waterbody, not this facility. Waterbody profile.
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 |
|---|---|---|---|
| Compton Creek CAR4051501019990202111430 | 697 m | listed | 8 |
| Compton Creek, unnamed tributary at Santa Fe Rd CAR4051501020110225144256 | 769 m | not listed | 0 |
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.
6 distinct measurements across 3 parameters, most recent sample Feb 06, 2024.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2023 | 3 | 3 | 0 | Feb 06, 2024 | Feb 06, 2024 |
| 2017 | 3 | 3 | 0 | Apr 06, 2018 | Apr 06, 2018 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 2 | 1 | Apr 06, 2018 | Feb 06, 2024 | Results |
| pH | SU | 2 | 0 | Apr 06, 2018 | Feb 06, 2024 | Results |
| Total Suspended Solids (TSS) | mg/L | 2 | 0 | Apr 06, 2018 | Feb 06, 2024 | Results |
All results (6 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 06, 2024 | Oil and Grease | ND | mg/L | Internal | Qualifying Storm Event | E1664A | 1331536 | |
| Feb 06, 2024 | pH | 7.06 | SU | Internal | Qualifying Storm Event | pH_Field | 1331536 | |
| Feb 06, 2024 | Total Suspended Solids (TSS) | 5 | mg/L | Internal | Qualifying Storm Event | A2540D | 1331536 | |
| Apr 06, 2018 | Oil and Grease | 2 | mg/L | Internal | Qualifying Storm Event | A5220B | 1007797 | |
| Apr 06, 2018 | pH | 6.8 | SU | Internal | Qualifying Storm Event | A4500HB | 1007797 | |
| Apr 06, 2018 | Total Suspended Solids (TSS) | 33 | mg/L | Internal | Qualifying Storm Event | A2540D | 1007797 |
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 | Oct 23, 2020 – Apr 30, 2025 | Oct 21, 2026 | All violations |
| Enforcement actions | 2 | 2 issued · 0 draft · 0 withdrawn, rescinded or superseded | Oct 23, 2020 – Apr 30, 2025 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Oct 21, 2015 – Oct 21, 2015 | Oct 21, 2026 | All inspections |
| Annual reports | 10 | 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 (15 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 08, 2026 | Annual reports | 1337511 | Annual report 2025 | — | |
| Jul 11, 2025 | Annual reports | 1296427 | Annual report 2024 | — | |
| Apr 30, 2025 | Enforcement actions | 455818 | NOV (Notice of Violation) | Historical | |
| Apr 30, 2025 | Violations | 891144 | Failure to Notify | Violation | Report |
| Mar 14, 2025 | Annual reports | 1063442 | Annual report 2020 | — | |
| Aug 12, 2024 | Annual reports | 1245635 | Annual report 2023 | — | |
| Jul 14, 2023 | Annual reports | 1191753 | Annual report 2022 | — | |
| Nov 06, 2020 | Annual reports | 980334 | Annual report 2019 | — | |
| Oct 23, 2020 | Enforcement actions | 438261 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Oct 23, 2020 | Violations | 874598 | Late Report | Violation | Report |
| Jul 15, 2019 | Annual reports | 956596 | Annual report 2018 | — | |
| Jul 16, 2018 | Annual reports | 942023 | Annual report 2017 | — | |
| Jul 15, 2017 | Annual reports | 881436 | Annual report 2016 | — | |
| Aug 11, 2016 | Annual reports | 843694 | Annual report 2015 | — | |
| Oct 21, 2015 | Inspections | 2027241 | B Type compliance | — | Follow-up Inspection Needed |
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.