Simi Valley Ready Mix
Terminated WDID 4 56I012014 Simi Valley, Ventura County Region 4 · Los Angeles
At a glance
- Permit Evidence: SMARTS record
- Terminated Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Simi Valley, Ventura County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Calleguas Creek (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
- 4 distinct results, 1 reporting year (2018 to 2018)
- Most recent sample Jan 17, 2019 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 9 inspections · 11 violation records · 7 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
- 34.2847, -118.80531
- Precision
- 4 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
- 300 Los Angeles, Simi Valley 93065
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Lower Simi Arroyo HUC12 180701030102
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
- Terminated
- Operator
- Cemex Construction Materials Pacific LLC
- Primary industry (SIC)
- 3273-Ready-Mixed Concrete
- Application ID
- 192667
- NOI processed
- Dec 01, 1995
- Termination effective
- Jan 05, 2024
- Last certified
- Mar 12, 2019
- Facility size
- 1.35 Acres
- Impervious area
- 100 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 192667 | Industrial | Terminated | Dec 01, 1995 | Jan 05, 2024 | Mar 12, 2019 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Calleguas Creek
- 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
15 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 |
|---|---|---|---|
| Calleguas Creek Reach 7 (Arroyo Simi) CAR4036200020000228103510 | 296 m | listed | 22 |
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.
4 distinct measurements across 4 parameters, most recent sample Jan 17, 2019.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2018 | 4 | 4 | 0 | Jan 17, 2019 | Jan 17, 2019 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Iron, Total | mg/L | 1 | 0 | Jan 17, 2019 | Jan 17, 2019 | Results |
| Oil and Grease | mg/L | 1 | 1 | Jan 17, 2019 | Jan 17, 2019 | Results |
| pH | SU | 1 | 0 | Jan 17, 2019 | Jan 17, 2019 | Results |
| Total Suspended Solids (TSS) | mg/L | 1 | 0 | Jan 17, 2019 | Jan 17, 2019 | Results |
All results (4 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Jan 17, 2019 | Iron, Total | 7.05 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1042448 | |
| Jan 17, 2019 | Oil and Grease | DNQ 2.58 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1042448 | |
| Jan 17, 2019 | pH | 8.3 | SU | Effluent | Qualifying Storm Event | pH_Field | 1042448 | |
| Jan 17, 2019 | Total Suspended Solids (TSS) | 290 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1042448 |
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 | 11 | 11 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1999 – Apr 12, 2006 | Oct 21, 2026 | All violations |
| Enforcement actions | 7 | 7 issued · 0 draft · 0 withdrawn, rescinded or superseded | Apr 12, 2002 – Jan 11, 2012 | Oct 21, 2026 | All actions |
| Inspections | 9 | inspections, not findings | Apr 12, 2002 – Mar 16, 2009 | Oct 21, 2026 | All inspections |
| Annual reports | 9 | certified reports (contents not shown) | 2015 – 2023 | 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 (36 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 12, 2024 | Annual reports | 1242924 | Annual report 2023 | — | |
| Jul 10, 2023 | Annual reports | 1188913 | Annual report 2022 | — | |
| Jul 08, 2022 | Annual reports | 1112257 | Annual report 2021 | — | |
| Jul 14, 2021 | Annual reports | 1068253 | Annual report 2020 | — | |
| Jul 07, 2020 | Annual reports | 985484 | Annual report 2019 | — | |
| Jul 01, 2019 | Annual reports | 953019 | Annual report 2018 | — | |
| Jun 29, 2018 | Annual reports | 938434 | Annual report 2017 | — | |
| Jul 12, 2017 | Annual reports | 877652 | Annual report 2016 | — | |
| Jul 06, 2016 | Annual reports | 846021 | Annual report 2015 | — | |
| Jan 11, 2012 | Enforcement actions | 407678 | 13267 Letter/Order (Water Code section 13267 letter or order) | Historical | |
| Mar 16, 2009 | Inspections | 1797072 | Enforcement Follow-up | — | No Further Action |
| May 11, 2006 | Enforcement actions | 315495 | NOV (Notice of Violation) | Historical | NOV |
| Apr 12, 2006 | Inspections | 2019367 | Enforcement Follow-up | — | Additional Info Required |
| Apr 12, 2006 | Violations | 444284 | Deficient BMP Implementation | Violation | Inspection |
| Apr 12, 2006 | Violations | 444285 | Deficient BMP Implementation | Violation | Inspection |
| Dec 05, 2005 | Enforcement actions | 412600 | Unknown | Historical | |
| Aug 16, 2005 | Enforcement actions | 412599 | Unknown | Historical | Noncompliance with CAO |
| Jun 13, 2005 | Inspections | 1736379 | Enforcement Follow-up | — | Additional Info Required |
| Apr 19, 2004 | Enforcement actions | 251354 | CAO (Cleanup and Abatement Order) | Historical | R4-2004-0051 |
| Mar 03, 2004 | Inspections | 2019366 | Enforcement Follow-up | — | Additional Info Required |
| Mar 03, 2004 | Violations | 253363 | Unauthorized NSWD | Violation | Inspection |
| Mar 03, 2004 | Violations | 253364 | Deficient BMP Implementation | Violation | Inspection |
| Mar 03, 2004 | Violations | 253365 | Unauthorized NSWD | Violation | Inspection |
| Mar 03, 2004 | Violations | 253366 | Deficient Report | Violation | Inspection |
| Feb 03, 2004 | Inspections | 2019365 | Enforcement Follow-up | — | 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.