United Rock Products
Active WDID 4 19I000779 Irwindale, Los Angeles County Region 4 · Los Angeles
Watershed, receiving-water, nearby-water and TMDL information is temporarily unavailable. Permit and monitoring records below are complete.
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Irwindale, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Sawpit Creek (as reported by the facility)
- Evidence: identification unavailable 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
- Evidence: unavailable
- Monitoring results Evidence: facility-reported
- 223 distinct results, 6 reporting years (2015 to 2020)
- Most recent sample Jan 29, 2021 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 7 violation records · 3 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
34.11459, -117.98038
Coordinates as reported in the permit application; not a discharge point.
- Facility address
- 1245 Arrow Hwy, Irwindale 91706
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
Unavailable.
Permits and applications Evidence: SMARTS record
Current permit record
- Permit type
- Industrial
- Application type
- Notice of Intent (WDID code I)
- Status
- Active
- Operator
- United Rock Products
- Primary industry (SIC)
- 1442-Construction Sand and Gravel
- Secondary SIC
- 3273-Ready-Mixed Concrete
- Tertiary SIC
- 2951-Asphalt Paving Mixtures and Blocks
- Application ID
- 188689
- NOI processed
- Mar 20, 1992
- Last certified
- Mar 13, 2024
- Facility size
- 150 Acres
- Impervious area
- 0 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 188689 | Industrial | Active | Mar 20, 1992 | — | Mar 13, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Sawpit Creek
Evidence: unavailable Match status unavailable.
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.
Evidence: unavailable Unavailable.
SMARTS TMDL records Evidence: SMARTS-reported
Evidence: unavailable Unavailable.
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.
223 distinct measurements across 5 parameters, most recent sample Jan 29, 2021.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2020 | 15 | 5 | 0 | Dec 28, 2020 | Jan 29, 2021 |
| 2019 | 45 | 5 | 0 | Nov 20, 2019 | Apr 06, 2020 |
| 2018 | 70 | 5 | 0 | Dec 06, 2018 | Mar 06, 2019 |
| 2017 | 20 | 5 | 0 | Jan 09, 2018 | Mar 22, 2018 |
| 2016 | 35 | 5 | 0 | Dec 16, 2016 | Jan 19, 2017 |
| 2015 | 38 | 5 | 0 | Sep 15, 2015 | Mar 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Iron, Total | mg/L | 45 | 0 | Sep 15, 2015 | Jan 29, 2021 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 45 | 2 | Sep 15, 2015 | Jan 29, 2021 | Results |
| Oil and Grease | mg/L | 45 | 33 | Sep 15, 2015 | Jan 29, 2021 | Results |
| pH | SU | 44 | 0 | Sep 15, 2015 | Jan 29, 2021 | Results |
| Total Suspended Solids (TSS) | mg/L | 44 | 0 | Sep 15, 2015 | Jan 29, 2021 | Results |
Oil and Grease results (45 distinct rows, show all)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Jan 29, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1145305 | |
| Dec 28, 2020 | Oil and Grease | DNQ 2.21 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1141605 | |
| Dec 28, 2020 | Oil and Grease | DNQ 3.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1141605 | |
| Apr 06, 2020 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1107459 | |
| Apr 06, 2020 | Oil and Grease | DNQ 2.57 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1107459 | |
| Apr 06, 2020 | Oil and Grease | 9.16 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1107459 | |
| Mar 12, 2020 | Oil and Grease | DNQ 3.62 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1107458 | |
| Mar 12, 2020 | Oil and Grease | 6.88 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1107458 | |
| Dec 04, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1100296 | |
| Dec 04, 2019 | Oil and Grease | 13.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1100296 | |
| Nov 20, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1099568 | |
| Nov 20, 2019 | Oil and Grease | DNQ 4.23 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1099568 | |
| Mar 06, 2019 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1053582 | |
| Mar 06, 2019 | Oil and Grease | DNQ 2.54 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1053582 | |
| Feb 14, 2019 | Oil and Grease | DNQ 1.74 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1053577 | |
| Feb 14, 2019 | Oil and Grease | DNQ 1.92 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1053577 | |
| Feb 14, 2019 | Oil and Grease | 5.86 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1053577 | |
| Jan 31, 2019 | Oil and Grease | DNQ 2.5 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1046762 | |
| Jan 31, 2019 | Oil and Grease | DNQ 3.39 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1046762 | |
| Jan 31, 2019 | Oil and Grease | 8.44 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1046762 | |
| Jan 17, 2019 | Oil and Grease | 7.94 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1046464 | |
| Jan 14, 2019 | Oil and Grease | DNQ 1.7 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1046464 | |
| Jan 14, 2019 | Oil and Grease | DNQ 2.45 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1046464 | |
| Dec 06, 2018 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1035859 | |
| Dec 06, 2018 | Oil and Grease | DNQ 2.39 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1035859 | |
| Dec 06, 2018 | Oil and Grease | DNQ 4.78 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1035859 | |
| Mar 22, 2018 | Oil and Grease | DNQ 2.23 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1000922 | |
| Mar 22, 2018 | Oil and Grease | DNQ 3 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1000922 | |
| Jan 09, 2018 | Oil and Grease | DNQ 2.19 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1000920 | |
| Jan 09, 2018 | Oil and Grease | DNQ 2.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1000920 | |
| Jan 19, 2017 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 925796 | |
| Jan 19, 2017 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 925796 | |
| Jan 11, 2017 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 921709 | |
| Jan 11, 2017 | Oil and Grease | DNQ 1.78 | mg/L | Effluent | Qualifying Storm Event | E1664A | 921709 | |
| Jan 05, 2017 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 921647 | |
| Dec 16, 2016 | Oil and Grease | DNQ 3.24 | mg/L | Effluent | Qualifying Storm Event | E1664A | 921904 | |
| Dec 16, 2016 | Oil and Grease | DNQ 4.15 | mg/L | Effluent | Qualifying Storm Event | E1664A | 921904 | |
| Mar 07, 2016 | Oil and Grease | 3.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 875607 | |
| Mar 07, 2016 | Oil and Grease | 4.47 | mg/L | Effluent | Qualifying Storm Event | E1664A | 875607 | |
| Jan 05, 2016 | Oil and Grease | 3.12 | mg/L | Effluent | Qualifying Storm Event | E1664A | 866336 | |
| Jan 05, 2016 | Oil and Grease | 5.55 | mg/L | Effluent | Qualifying Storm Event | E1664A | 866336 | |
| Jan 05, 2016 | Oil and Grease | 2.56 | mg/L | Effluent | Qualifying Storm Event | E1664A | 866336 | |
| Sep 15, 2015 | Oil and Grease | 2.1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 856371 | |
| Sep 15, 2015 | Oil and Grease | < 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 856371 | |
| Sep 15, 2015 | Oil and Grease | < 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 856371 |
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 | 7 | 7 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 02, 1993 – Dec 30, 2019 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Dec 01, 1993 – Aug 14, 2020 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Oct 15, 2004 – Jun 20, 2024 | 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 (23 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 06, 2026 | Annual reports | 1336442 | Annual report 2025 | — | |
| Jun 23, 2025 | Annual reports | 1295305 | Annual report 2024 | — | |
| Jul 15, 2024 | Annual reports | 1244440 | Annual report 2023 | — | |
| Jun 20, 2024 | Inspections | 2064744 | Complaint | Finalized | No Further Action |
| Jul 10, 2023 | Annual reports | 1190499 | Annual report 2022 | — | |
| Jul 11, 2022 | Annual reports | 1113985 | Annual report 2021 | — | |
| Jul 12, 2021 | Annual reports | 1070055 | Annual report 2020 | — | |
| Aug 14, 2020 | Enforcement actions | 437228 | NOV (Notice of Violation) | Historical | |
| Jul 10, 2020 | Annual reports | 987414 | Annual report 2019 | — | |
| Dec 30, 2019 | Violations | 873669 | Deficient Report | Violation | Report |
| Jun 28, 2019 | Annual reports | 955024 | Annual report 2018 | — | |
| Jul 09, 2018 | Annual reports | 940442 | Annual report 2017 | — | |
| Jul 11, 2017 | Annual reports | 879771 | Annual report 2016 | — | |
| Jul 08, 2016 | Annual reports | 846965 | Annual report 2015 | — | |
| Oct 15, 2004 | Inspections | 1735112 | B Type compliance | — | No Further Action |
| Dec 01, 1999 | Enforcement actions | 411456 | NOV (Notice of Violation) | Active | |
| Jul 02, 1999 | Violations | 850430 | Late Report | Violation | Report |
| Jul 02, 1998 | Violations | 850429 | Late Report | Violation | Report |
| Jul 02, 1997 | Violations | 850428 | Late Report | Violation | Report |
| Jul 02, 1996 | Violations | 850427 | Late Report | Violation | Report |
| Jul 02, 1995 | Violations | 850426 | Late Report | Violation | Report |
| Dec 01, 1993 | Enforcement actions | 411455 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Active | |
| Jul 02, 1993 | Violations | 850425 | Late Report | 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 |
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.