National Ready Mixed Concrete
Active WDID 4 56I003249 Moorpark, 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
- Moorpark, Ventura County
- Region 4 · Los Angeles · Location · Statewide map
- 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
- 8 distinct results, 2 reporting years (2017 to 2019)
- Most recent sample Dec 04, 2019 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 3 inspections · 4 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
- 34.28727, -118.86843
- 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
- 13950 Princeton Ave, Moorpark 93021
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Arroyo Las Posas HUC12 180701030103
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
- National Ready Mixed Concrete Company
- Primary industry (SIC)
- 3273-Ready-Mixed Concrete
- Application ID
- 192587
- NOI processed
- Apr 03, 1992
- Last certified
- Mar 05, 2015
- Facility size
- 7 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 192587 | Industrial | Active | Apr 03, 1992 | — | Mar 05, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Arroyo Simi
- 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 6 (Conejo Creek to Hitch Rd.) CAR4036200020000228094015 | 182 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.
8 distinct measurements across 4 parameters, most recent sample Dec 04, 2019.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2019 | 4 | 4 | 0 | Dec 04, 2019 | Dec 04, 2019 |
| 2017 | 4 | 4 | 0 | Mar 22, 2018 | Mar 22, 2018 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Iron, Total | mg/L | 2 | 0 | Mar 22, 2018 | Dec 04, 2019 | Results |
| Oil and Grease | mg/L | 2 | 2 | Mar 22, 2018 | Dec 04, 2019 | Results |
| pH | SU | 2 | 0 | Mar 22, 2018 | Dec 04, 2019 | Results |
| Total Suspended Solids (TSS) | mg/L | 2 | 0 | Mar 22, 2018 | Dec 04, 2019 | Results |
All results (8 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Dec 04, 2019 | Iron, Total | .359 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1097892 | |
| Dec 04, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1097892 | |
| Dec 04, 2019 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1097892 | |
| Dec 04, 2019 | Total Suspended Solids (TSS) | 24 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1097892 | |
| Mar 22, 2018 | Iron, Total | 1.86 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 999444 | |
| Mar 22, 2018 | Oil and Grease | DNQ 2.7 | mg/L | Effluent | Qualifying Storm Event | E1664B | 999444 | |
| Mar 22, 2018 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 999444 | |
| Mar 22, 2018 | Total Suspended Solids (TSS) | 41.8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 999444 |
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 | 4 | 4 Violation · 0 Potential (preliminary) · 0 Dismissed | Apr 07, 2000 – Jul 21, 2004 | Oct 21, 2026 | All violations |
| Enforcement actions | 2 | 2 issued · 0 draft · 0 withdrawn, rescinded or superseded | Dec 20, 2002 – Aug 02, 2004 | Oct 21, 2026 | All actions |
| Inspections | 3 | inspections, not findings | Jul 21, 2004 – May 17, 2019 | 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 (20 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 10, 2026 | Annual reports | 1335052 | Annual report 2025 | — | |
| Jul 13, 2025 | Annual reports | 1293851 | Annual report 2024 | — | |
| Jun 27, 2024 | Annual reports | 1242919 | Annual report 2023 | — | |
| Jun 23, 2023 | Annual reports | 1188908 | Annual report 2022 | — | |
| Jun 22, 2022 | Annual reports | 1112250 | Annual report 2021 | — | |
| Jun 21, 2021 | Annual reports | 1068246 | Annual report 2020 | — | |
| Jun 30, 2020 | Annual reports | 985476 | Annual report 2019 | — | |
| Jun 28, 2019 | Annual reports | 953011 | Annual report 2018 | — | |
| May 17, 2019 | Inspections | 2042933 | B Type compliance | — | No Further Action |
| Jun 26, 2018 | Annual reports | 938426 | Annual report 2017 | — | |
| Jun 23, 2017 | Annual reports | 877643 | Annual report 2016 | — | |
| Jun 28, 2016 | Annual reports | 846700 | Annual report 2015 | — | |
| Oct 26, 2004 | Inspections | 1736608 | Enforcement Follow-up | — | |
| Aug 02, 2004 | Enforcement actions | 253049 | NOV (Notice of Violation) | Historical | NOV |
| Jul 21, 2004 | Inspections | 1736609 | B Type compliance | — | Additional Info Required |
| Jul 21, 2004 | Violations | 252594 | Deficient BMP Implementation | Violation | Inspection |
| Jul 21, 2004 | Violations | 252595 | Deficient BMP Implementation | Violation | Inspection |
| Jul 21, 2004 | Violations | 252648 | Deficient BMP Implementation | Violation | Inspection |
| Dec 20, 2002 | Enforcement actions | 256963 | NOV (Notice of Violation) | Historical | NOV |
| Apr 07, 2000 | Violations | 225762 | Failure to Pay Enforcement Fee | Violation | Report |
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.