3M Company
Active WDID 4 19I002054 Monrovia, 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
- Monrovia, Los Angeles County
- Region 4 · Los Angeles · Location · Statewide map
- Receiving water
- Los Angeles River (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
- 143 distinct results, 5 reporting years (2016 to 2024)
- Most recent sample Feb 13, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 3 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
- Coordinates
- 34.13405, -117.99075
- 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
- 1601 S Shamrock Ave, Monrovia 91016
- Regional Water Board
- 4 — Los Angeles
HUC12 watershed Evidence: spatial
- Santa Anita Wash-Rio Hondo HUC12 180701050302
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
- 3M Company
- Primary industry (SIC)
- 3497-Metal Foil and Leaf
- Secondary SIC
- 3069-Fabricated Rubber Products, NEC
- Tertiary SIC
- 2295-Coated Fabrics, Not Rubberized
- Application ID
- 188885
- NOI processed
- Mar 30, 1992
- Last certified
- Jul 14, 2021
- Facility size
- 3 Acres
- Impervious area
- 1 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 188885 | Industrial | Active | Mar 30, 1992 | — | Jul 14, 2021 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Los Angeles River
- 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
7 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 |
|---|---|---|---|
| Sawpit Creek CAR4053100020050119104537 | 158 m | listed | 4 |
Waterbodies within 1.0 km of the reported facility location. Method proximity/1.
SMARTS TMDL records Evidence: SMARTS-reported
SMARTS TMDL record as reported for this facility; it is not a determination that the TMDL applies to the facility.
| TMDL | Waterbody (as reported) | Parameter | Limit | Type | Period | Due | Discharges to TMDL water |
|---|---|---|---|---|---|---|---|
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Cadmium, Total | .0031 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Copper, Total | .06749 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Lead, Total | .094 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Metals TMDL | Los Angeles River and Los Angeles River Tributaries | Zinc, Total | .159 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrate, Total (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite Plus Nitrate (as N) | 8 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
| Los Angeles River Nitrogen TMDL | Los Angeles River Watershed | Nitrite, Total (as N) | 1 mg/L | NEL instantaneous | FINAL | 2020-07-01 | Y |
7 records. Links between these records and specific TMDL projects or listed waterbodies have not been reviewed and are not shown.
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.
143 distinct measurements across 25 parameters, most recent sample Feb 13, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2024 | 25 | 25 | 0 | Feb 13, 2025 | Feb 13, 2025 |
| 2023 | 46 | 25 | 0 | Jan 22, 2024 | Feb 05, 2024 |
| 2022 | 11 | 11 | 0 | Jan 05, 2023 | Jan 05, 2023 |
| 2017 | 49 | 7 | 0 | Jan 08, 2018 | Mar 21, 2018 |
| 2016 | 12 | 3 | 0 | Dec 15, 2016 | Feb 17, 2017 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 16 | 15 | Dec 15, 2016 | Feb 13, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 16 | 2 | Dec 15, 2016 | Feb 13, 2025 | Results |
| Iron, Total | mg/L | 12 | 1 | Jan 08, 2018 | Feb 13, 2025 | Results |
| Nitrite Plus Nitrate (as N) | mg/L | 12 | 1 | Jan 08, 2018 | Feb 13, 2025 | Results |
| Aluminum, Total | mg/L | 11 | 0 | Jan 08, 2018 | Feb 13, 2025 | Results |
| Zinc, Total | mg/L | 11 | 0 | Jan 08, 2018 | Feb 13, 2025 | Results |
| pH | SU | 9 | 1 | Dec 15, 2016 | Feb 13, 2025 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 4 | 0 | Jan 05, 2023 | Feb 13, 2025 | Results |
| Nitrate, Total (as N) | mg/L | 4 | 0 | Jan 05, 2023 | Feb 13, 2025 | Results |
| Nitrite, Total (as N) | mg/L | 4 | 4 | Jan 05, 2023 | Feb 13, 2025 | Results |
| Antimony, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Barium, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
Show 13 more parameters
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Bis (2-Ethylhexyl) Phthalate | ug/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Cadmium, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Chromium (Total) | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Copper, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Diesel Oil | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Gasoline | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Lead, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Mercury, Total | ug/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Motor Oil | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Nickel, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Selenium, Total | mg/L | 3 | 3 | Jan 22, 2024 | Feb 13, 2025 | Results |
| Total Organic Carbon (TOC) | mg/L | 3 | 0 | Jan 05, 2023 | Feb 13, 2025 | Results |
| Arsenic, Total | mg/L | 2 | 2 | Feb 05, 2024 | Feb 13, 2025 | Results |
All results (143 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 13, 2025 | Aluminum, Total | .56 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1323728 | |
| Feb 13, 2025 | Antimony, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Arsenic, Total | ND | mg/L | Effluent | Qualifying Storm Event | EPA 200.7 | 1323728 | |
| Feb 13, 2025 | Barium, Total | DNQ .014 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Bis (2-Ethylhexyl) Phthalate | ND | ug/L | Effluent | Qualifying Storm Event | 1323728 | ||
| Feb 13, 2025 | Cadmium, Total | ND | mg/L | Effluent | Qualifying Storm Event | EPA 200.7 | 1323728 | |
| Feb 13, 2025 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Copper, Total | DNQ .009 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Diesel Oil | ND | mg/L | Effluent | Qualifying Storm Event | SW8015B | 1323728 | |
| Feb 13, 2025 | Electrical Conductivity @ 25 Deg. C | 29.2 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1323728 | |
| Feb 13, 2025 | Gasoline | ND | mg/L | Effluent | Qualifying Storm Event | SW8015B | 1323728 | |
| Feb 13, 2025 | Iron, Total | .676 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Lead, Total | DNQ .007 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Mercury, Total | ND | ug/L | Effluent | Qualifying Storm Event | E245.1 | 1323728 | |
| Feb 13, 2025 | Motor Oil | ND | mg/L | Effluent | Qualifying Storm Event | 1323728 | ||
| Feb 13, 2025 | Nickel, Total | DNQ .002 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Nitrate, Total (as N) | .135 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1323728 | |
| Feb 13, 2025 | Nitrite Plus Nitrate (as N) | .135 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1323728 | |
| Feb 13, 2025 | Nitrite, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1323728 | |
| Feb 13, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1323728 | |
| Feb 13, 2025 | pH | 6.99 | SU | Effluent | Qualifying Storm Event | A4500HB | 1323728 | |
| Feb 13, 2025 | Selenium, Total | DNQ .004 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1323728 | |
| Feb 13, 2025 | Total Organic Carbon (TOC) | 2.4 | mg/L | Effluent | Qualifying Storm Event | A5310B | 1323728 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1323728 | |
| Feb 13, 2025 | Zinc, Total | .09 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1323728 | |
| Feb 05, 2024 | Antimony, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Arsenic, Total | ND | mg/L | Effluent | Qualifying Storm Event | EPA 200.7 | 1280923 | |
| Feb 05, 2024 | Barium, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Bis (2-Ethylhexyl) Phthalate | ND | ug/L | Effluent | Qualifying Storm Event | 1280923 | ||
| Feb 05, 2024 | Cadmium, Total | ND | mg/L | Effluent | Qualifying Storm Event | EPA 200.7 | 1280923 | |
| Feb 05, 2024 | Chromium (Total) | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Copper, Total | DNQ .014 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Diesel Oil | ND | mg/L | Effluent | Qualifying Storm Event | SW8015B | 1280923 | |
| Feb 05, 2024 | Electrical Conductivity @ 25 Deg. C | 12 | umhos/cm | Effluent | Qualifying Storm Event | A2510B | 1280923 | |
| Feb 05, 2024 | Gasoline | ND | mg/L | Effluent | Qualifying Storm Event | SW8015B | 1280923 | |
| Feb 05, 2024 | Iron, Total | .142 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Lead, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Mercury, Total | ND | ug/L | Effluent | Qualifying Storm Event | E245.1 | 1280923 | |
| Feb 05, 2024 | Motor Oil | ND | mg/L | Effluent | Qualifying Storm Event | 1280923 | ||
| Feb 05, 2024 | Nickel, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Nitrate, Total (as N) | .047 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1280923 | |
| Feb 05, 2024 | Nitrite Plus Nitrate (as N) | .047 | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1280923 | |
| Feb 05, 2024 | Nitrite, Total (as N) | ND | mg/L | Effluent | Qualifying Storm Event | A4500NE | 1280923 | |
| Feb 05, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1280923 | |
| Feb 05, 2024 | pH | 6.71 | SU | Effluent | Qualifying Storm Event | A4500HB | 1280923 | |
| Feb 05, 2024 | Selenium, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280923 | |
| Feb 05, 2024 | Total Suspended Solids (TSS) | 2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1280923 | |
| Jan 22, 2024 | Aluminum, Total | .14 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1276832 | |
| Jan 22, 2024 | Antimony, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1276832 | |
| Jan 22, 2024 | Barium, Total | ND | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1276832 |
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 | 3 | 3 Violation · 0 Potential (preliminary) · 0 Dismissed | Jan 09, 2015 – Jan 01, 2019 | Oct 21, 2026 | All violations |
| Enforcement actions | 3 | 3 issued · 0 draft · 0 withdrawn, rescinded or superseded | Jan 09, 2015 – Feb 28, 2019 | Oct 21, 2026 | All actions |
| Inspections | 1 | inspections, not findings | Jan 18, 2024 – Jan 18, 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 (18 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 10, 2026 | Annual reports | 1336873 | Annual report 2025 | — | |
| Jul 14, 2025 | Annual reports | 1295760 | Annual report 2024 | — | |
| Jul 09, 2024 | Annual reports | 1244926 | Annual report 2023 | — | |
| Jan 18, 2024 | Inspections | 2063240 | B Type compliance | Finalized | No Further Action |
| Oct 17, 2023 | Annual reports | 1070626 | Annual report 2020 | — | |
| Oct 17, 2023 | Annual reports | 1114532 | Annual report 2021 | — | |
| Oct 17, 2023 | Annual reports | 845623 | Annual report 2015 | — | |
| Oct 17, 2023 | Annual reports | 955663 | Annual report 2018 | — | |
| Oct 17, 2023 | Annual reports | 988035 | Annual report 2019 | — | |
| Sep 19, 2023 | Annual reports | 880453 | Annual report 2016 | — | |
| Sep 19, 2023 | Annual reports | 941085 | Annual report 2017 | — | |
| Jul 07, 2023 | Annual reports | 1191009 | Annual report 2022 | — | |
| Feb 28, 2019 | Enforcement actions | 432585 | NOV (Notice of Violation) | Historical | |
| Jan 01, 2019 | Violations | 869516 | Late Report | Violation | Report |
| Apr 19, 2017 | Enforcement actions | 425983 | NOV (Notice of Violation) | Historical | |
| Aug 14, 2015 | Violations | 863066 | Incomplete/Insufficient SWPPP | Violation | Internal Report |
| Jan 09, 2015 | Enforcement actions | 417621 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jan 09, 2015 | Violations | 855864 | 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 |
| 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.