Pre Con Products
Active WDID 4 56I003953 Simi Valley, Ventura 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
- Simi Valley, Ventura County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Arroyo Simi Flood Control Channel (as reported by the facility)
- Evidence: not confirmed 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
- 249 distinct results, 10 reporting years (2015 to 2025)
- Most recent sample Dec 24, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 7 inspections · 14 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
- 34.28312, -118.80389
- 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
- 240 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
- Active
- Operator
- Pre Con Products
- Primary industry (SIC)
- 3272-Concrete Products, Except Block and Brick
- Application ID
- 192592
- NOI processed
- Apr 03, 1992
- Last certified
- Jan 26, 2015
- Facility size
- 10 Acres
- Impervious area
- 15 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 192592 | Industrial | Active | Apr 03, 1992 | — | Jan 26, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Arroyo Simi Flood Control Channel
- Discharges directly / indirectly
- N / Y (as answered in the permit application)
Evidence: not confirmed Not matchable to a single waterbody
Receiving-water text as reported by the discharger in SMARTS; no waterbody identification has been confirmed.
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 | 246 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.
249 distinct measurements across 7 parameters, most recent sample Dec 24, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 4 | 4 | 0 | Dec 24, 2025 | Dec 24, 2025 |
| 2023 | 16 | 4 | 0 | Dec 21, 2023 | Feb 01, 2024 |
| 2022 | 20 | 4 | 0 | Jan 05, 2023 | Mar 14, 2023 |
| 2021 | 4 | 4 | 0 | Dec 14, 2021 | Dec 14, 2021 |
| 2020 | 4 | 4 | 0 | Jan 29, 2021 | Jan 29, 2021 |
| 2019 | 12 | 4 | 0 | Dec 03, 2019 | Mar 18, 2020 |
| 2018 | 24 | 4 | 0 | Jan 17, 2019 | Feb 14, 2019 |
| 2017 | 24 | 4 | 0 | Jan 09, 2018 | Mar 21, 2018 |
| 2016 | 56 | 4 | 0 | Oct 28, 2016 | Feb 17, 2017 |
| 2015 | 85 | 5 | 0 | Jan 06, 2016 | Apr 08, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 58 | 35 | Jan 06, 2016 | Dec 24, 2025 | Results |
| pH | SU | 58 | 0 | Jan 06, 2016 | Dec 24, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 58 | 2 | Jan 06, 2016 | Dec 24, 2025 | Results |
| Iron, Total | mg/L | 31 | 1 | Oct 28, 2016 | Dec 14, 2021 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 17 | 0 | Jan 06, 2016 | Apr 08, 2016 | Results |
| Total Organic Carbon (TOC), Percent Removal | % | 17 | 0 | Jan 06, 2016 | Apr 08, 2016 | Results |
| Iron, Total Recoverable | mg/L | 10 | 0 | Jan 05, 2023 | Dec 24, 2025 | Results |
All results (249 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Dec 24, 2025 | Iron, Total Recoverable | 1.5 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1364579 | |
| Dec 24, 2025 | Oil and Grease | 2.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1364579 | |
| Dec 24, 2025 | pH | 7.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1364579 | |
| Dec 24, 2025 | Total Suspended Solids (TSS) | 32 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1364579 | |
| Feb 01, 2024 | Iron, Total Recoverable | 3.9 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280548 | |
| Feb 01, 2024 | Iron, Total Recoverable | 3 | mg/L | Internal | Qualifying Storm Event | E200.7 | 1280548 | |
| Feb 01, 2024 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1280548 | |
| Feb 01, 2024 | Oil and Grease | 1.6 | mg/L | Internal | Qualifying Storm Event | E1664A | 1280548 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1280548 | |
| Feb 01, 2024 | pH | 7 | SU | Internal | Qualifying Storm Event | pH_Paper | 1280548 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 72 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1280548 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 100 | mg/L | Internal | Qualifying Storm Event | A2540D | 1280548 | |
| Dec 21, 2023 | Iron, Total Recoverable | 3.2 | mg/L | Internal | Qualifying Storm Event | E200.7 | 1273275 | |
| Dec 21, 2023 | Iron, Total Recoverable | 4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1273275 | |
| Dec 21, 2023 | Oil and Grease | ND 2 | mg/L | Internal | Qualifying Storm Event | E1664A | 1273275 | |
| Dec 21, 2023 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1273275 | |
| Dec 21, 2023 | pH | 11.95 | SU | Internal | Qualifying Storm Event | A4500HB | 1273275 | |
| Dec 21, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1273275 | |
| Dec 21, 2023 | Total Suspended Solids (TSS) | 160 | mg/L | Internal | Qualifying Storm Event | A2540D | 1273275 | |
| Dec 21, 2023 | Total Suspended Solids (TSS) | 100 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273275 | |
| Mar 14, 2023 | Iron, Total Recoverable | .44 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1230599 | |
| Mar 14, 2023 | Oil and Grease | 6.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1230599 | |
| Mar 14, 2023 | pH | 8.6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1230599 | |
| Mar 14, 2023 | Total Suspended Solids (TSS) | 11 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1230599 | |
| Feb 24, 2023 | Iron, Total Recoverable | 1.2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1234108 | |
| Feb 24, 2023 | Oil and Grease | ND 2.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1234108 | |
| Feb 24, 2023 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1234108 | |
| Feb 24, 2023 | Total Suspended Solids (TSS) | 21 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1234108 | |
| Jan 16, 2023 | Iron, Total Recoverable | .2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1227587 | |
| Jan 16, 2023 | Oil and Grease | ND 2.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1227587 | |
| Jan 16, 2023 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1227587 | |
| Jan 16, 2023 | Total Suspended Solids (TSS) | 4.9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1227587 | |
| Jan 09, 2023 | Iron, Total Recoverable | 1.1 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1234110 | |
| Jan 09, 2023 | Oil and Grease | ND 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1234110 | |
| Jan 09, 2023 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1234110 | |
| Jan 09, 2023 | Total Suspended Solids (TSS) | 22 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1234110 | |
| Jan 05, 2023 | Iron, Total Recoverable | 2.2 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1226716 | |
| Jan 05, 2023 | Oil and Grease | ND 3.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1226716 | |
| Jan 05, 2023 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1226716 | |
| Jan 05, 2023 | Total Suspended Solids (TSS) | 47 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1226716 | |
| Dec 14, 2021 | Iron, Total | 1.22 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1198636 | |
| Dec 14, 2021 | Oil and Grease | < 1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1198636 | |
| Dec 14, 2021 | pH | 9.89 | SU | Effluent | Qualifying Storm Event | pH_Field | 1198636 | |
| Dec 14, 2021 | Total Suspended Solids (TSS) | 45 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1198636 | |
| Jan 29, 2021 | Iron, Total | .72 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1143052 | |
| Jan 29, 2021 | Oil and Grease | 1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1143052 | |
| Jan 29, 2021 | pH | 7.45 | SU | Effluent | Qualifying Storm Event | pH_Field | 1143052 | |
| Jan 29, 2021 | Total Suspended Solids (TSS) | 30 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1143052 | |
| Mar 18, 2020 | Iron, Total | .4 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1122286 | |
| Mar 18, 2020 | Oil and Grease | < 1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1122286 |
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 | 14 | 14 Violation · 0 Potential (preliminary) · 0 Dismissed | Apr 17, 1996 – Feb 05, 2009 | Oct 21, 2026 | All violations |
| Enforcement actions | 7 | 7 issued · 0 draft · 0 withdrawn, rescinded or superseded | Feb 08, 2000 – Apr 20, 2010 | Oct 21, 2026 | All actions |
| Inspections | 7 | inspections, not findings | Oct 23, 2001 – Dec 06, 2023 | 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 (39 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jun 02, 2026 | Annual reports | 1337121 | Annual report 2025 | — | |
| Jul 08, 2025 | Annual reports | 1296015 | Annual report 2024 | — | |
| Jul 10, 2024 | Annual reports | 1245197 | Annual report 2023 | — | |
| Dec 06, 2023 | Inspections | 2064371 | B Type compliance | Finalized | No Further Action |
| Jul 12, 2023 | Annual reports | 1191293 | Annual report 2022 | — | |
| Jul 15, 2022 | Annual reports | 1114842 | Annual report 2021 | — | |
| Jul 08, 2021 | Annual reports | 1062926 | Annual report 2020 | — | |
| Jul 15, 2020 | Annual reports | 979776 | Annual report 2019 | — | |
| Jul 12, 2019 | Annual reports | 956022 | Annual report 2018 | — | |
| Jul 12, 2018 | Annual reports | 941445 | Annual report 2017 | — | |
| Jul 14, 2017 | Annual reports | 880827 | Annual report 2016 | — | |
| Jul 13, 2016 | Annual reports | 840547 | Annual report 2015 | — | |
| Apr 20, 2010 | Enforcement actions | 404919 | SEL (Staff Enforcement Letter) | Historical | |
| Feb 05, 2009 | Violations | 844171 | Deficient BMP Implementation | Violation | Report |
| Jun 13, 2005 | Inspections | 1736897 | Enforcement Follow-up | — | |
| May 06, 2004 | Enforcement actions | 252002 | CAO (Cleanup and Abatement Order) | Historical | R4-2004-0052 |
| Mar 03, 2004 | Inspections | 1736894 | Enforcement Follow-up | — | Additional Info Required |
| Mar 03, 2004 | Violations | 253135 | Deficient BMP Implementation | Violation | Inspection |
| Mar 03, 2004 | Violations | 253136 | Deficient BMP Implementation | Violation | Inspection |
| Feb 03, 2004 | Inspections | 1736893 | Enforcement Follow-up | — | Additional Info Required |
| Feb 03, 2004 | Violations | 253134 | Deficient BMP Implementation | Violation | Inspection |
| Jan 02, 2004 | Violations | 253205 | Deficient BMP Implementation | Violation | Report |
| Dec 11, 2003 | Enforcement actions | 249595 | NOV (Notice of Violation) | Historical | NOV |
| Nov 18, 2003 | Inspections | 1736892 | Complaint | — | Additional Info Required |
| Nov 18, 2003 | Violations | 242662 | Deficient BMP Implementation | Violation | Inspection |
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.