Imerys Perlite USA Inc
Active WDID 9 37I004349 Escondido, San Diego County Region 9 · San Diego
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Escondido, San Diego County
- Region 9 · San Diego · Location · Statewide map
- Receiving water
- Escondido Creek (as reported by the facility)
- Evidence: identification corroborated Escondido Creek Details
- Identified receiving water on the 2026 303(d) list
- Yes · 17 Appendix A decisions, category 5 Evidence: State-published
- Describes the waterbody, not this facility · Waterbody profile
- 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
- 100 distinct results, 10 reporting years (2015 to 2024)
- Most recent sample Mar 11, 2025 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 1 violation record · 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
- 33.12249, -117.10901
- 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
- 1450 Simpson Way, Escondido 92029
- Regional Water Board
- 9 — San Diego
HUC12 watershed Evidence: spatial
- Lower Escondido Creek HUC12 180703030402
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
- Imerys Perlite USA Inc
- Primary industry (SIC)
- 3295-Minerals and Earths, Ground or Otherwise Treated
- Application ID
- 218279
- NOI processed
- Apr 06, 1992
- Last certified
- Apr 23, 2026
- Facility size
- 128238 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 218279 | Industrial | Active | Apr 06, 1992 | — | Apr 23, 2026 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Escondido Creek
- Discharges directly / indirectly
- N / N (as answered in the permit application)
Evidence: identification corroborated Escondido Creek CAR9046200020011005134542
Receiving water reported by facility — waterbody identification corroborated by geographic evidence.
Nearest distance from the reported facility location: 908 m. Method receiving_water/2.
2026 Integrated Report status Evidence: State-published
Escondido Creek is on the 2026 Clean Water Act section 303(d) list (17 Appendix A decisions; category 5).
| Pollutant | Category | Listing decision | TMDL requirement | Decision ID |
|---|---|---|---|---|
| Benthic Community Effects | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 126440 |
| Bifenthrin | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 111671 |
| Cyfluthrin | 5 | List on 303(d) list (TMDL required list) | 5A | 111678 |
| Cypermethrin | 5 | List on 303(d) list (TMDL required list) | 5A | 144943 |
| DDT (Dichlorodiphenyltrichloroethane) | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 127350 |
| Indicator Bacteria | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 127882 |
| Iron | 5 | List on 303(d) list (TMDL required list) | 5A | 111651 |
| Manganese | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 111654 |
| Nitrogen | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 127254 |
| Phosphate | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 68646 |
| Phosphorus | 5 | List on 303(d) list (TMDL required list) | 5A | 111660 |
| Pyrethroids | 5 | List on 303(d) list (TMDL required list) | 5A | 111670 |
| Selenium | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 158370 |
| Sulfates | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 111663 |
| Total Dissolved Solids | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 111665 |
| Toxicity | 5 | Do Not Delist from 303(d) list (TMDL required list) | 5A | 111666 |
| Turbidity | 5 | List on 303(d) list (TMDL required list) | 5A | 111667 |
Published by the State Water Resources Control Board (2026 California Integrated Report, Appendix A). Listing status is taken from Appendix A only. State Board adoption 2026-02-03; USEPA approval not confirmed. A listing describes the waterbody, not this facility. Waterbody profile.
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 |
|---|---|---|---|
| Escondido Creek CAR9046200020011005134542 | 908 m | listed | 17 |
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.
100 distinct measurements across 5 parameters, most recent sample Mar 11, 2025.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2024 | 8 | 4 | 0 | Feb 13, 2025 | Mar 11, 2025 |
| 2023 | 8 | 4 | 0 | Nov 30, 2023 | Feb 05, 2024 |
| 2022 | 8 | 4 | 0 | Dec 12, 2022 | Jan 10, 2023 |
| 2021 | 12 | 4 | 0 | Oct 08, 2021 | Mar 04, 2022 |
| 2020 | 8 | 4 | 0 | Dec 28, 2020 | Jan 25, 2021 |
| 2019 | 8 | 4 | 0 | Nov 27, 2019 | Dec 04, 2019 |
| 2018 | 16 | 4 | 0 | Nov 29, 2018 | Jan 31, 2019 |
| 2017 | 9 | 4 | 2 | Jan 09, 2018 | Mar 14, 2018 |
| 2016 | 8 | 4 | 0 | Nov 21, 2016 | Dec 16, 2016 |
| 2015 | 16 | 5 | 0 | Nov 25, 2015 | Apr 07, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 25 | 16 | Nov 25, 2015 | Mar 11, 2025 | Results |
| pH | SU | 25 | 0 | Nov 25, 2015 | Mar 11, 2025 | Results |
| Total Suspended Solids (TSS) | mg/L | 25 | 0 | Nov 25, 2015 | Mar 11, 2025 | Results |
| Iron, Total Recoverable | mg/L | 23 | 0 | Feb 18, 2016 | Mar 11, 2025 | Results |
| Iron, Total | mg/L | 2 | 0 | Nov 25, 2015 | Dec 22, 2015 | Results |
All results (101 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Mar 11, 2025 | Iron, Total Recoverable | 1.4 | mg/L | Effluent | Qualifying Storm Event | E200.8 | 1328914 | |
| Mar 11, 2025 | Oil and Grease | ND 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1328914 | |
| Mar 11, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1328914 | |
| Mar 11, 2025 | Total Suspended Solids (TSS) | 50 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1328914 | |
| Feb 13, 2025 | Iron, Total Recoverable | 1.3 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1326648 | |
| Feb 13, 2025 | Oil and Grease | 3.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1326648 | |
| Feb 13, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1326648 | |
| Feb 13, 2025 | Total Suspended Solids (TSS) | 55 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1326648 | |
| Feb 05, 2024 | Iron, Total Recoverable | .57 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1280297 | |
| Feb 05, 2024 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1280297 | |
| Feb 05, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1280297 | |
| Feb 05, 2024 | Total Suspended Solids (TSS) | 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1280297 | |
| Nov 30, 2023 | Iron, Total Recoverable | .24 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1270277 | |
| Nov 30, 2023 | Oil and Grease | 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1270277 | |
| Nov 30, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1270277 | |
| Nov 30, 2023 | Total Suspended Solids (TSS) | 16 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1270277 | |
| Jan 10, 2023 | Iron, Total Recoverable | .31 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1227981 | |
| Jan 10, 2023 | Oil and Grease | ND 2.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1227981 | |
| Jan 10, 2023 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1227981 | |
| Jan 10, 2023 | Total Suspended Solids (TSS) | 8 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1227981 | |
| Dec 12, 2022 | Iron, Total Recoverable | .13 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1224202 | |
| Dec 12, 2022 | Oil and Grease | ND 3.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1224202 | |
| Dec 12, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1224202 | |
| Dec 12, 2022 | Total Suspended Solids (TSS) | 7.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1224202 | |
| Mar 04, 2022 | Iron, Total Recoverable | .38 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1179623 | |
| Mar 04, 2022 | Oil and Grease | 3.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1179623 | |
| Mar 04, 2022 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1179623 | |
| Mar 04, 2022 | Total Suspended Solids (TSS) | 7.3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1179623 | |
| Oct 25, 2021 | Iron, Total Recoverable | 1.3 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1170146 | |
| Oct 25, 2021 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1170146 | |
| Oct 25, 2021 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1170146 | |
| Oct 25, 2021 | Total Suspended Solids (TSS) | 31 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1170146 | |
| Oct 08, 2021 | Iron, Total Recoverable | .26 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1168175 | |
| Oct 08, 2021 | Oil and Grease | ND 1.4 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1168175 | |
| Oct 08, 2021 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1168175 | |
| Oct 08, 2021 | Total Suspended Solids (TSS) | 6.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1168175 | |
| Jan 25, 2021 | Iron, Total Recoverable | .71 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1143769 | |
| Jan 25, 2021 | Oil and Grease | 5.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1143769 | |
| Jan 25, 2021 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1143769 | |
| Jan 25, 2021 | Total Suspended Solids (TSS) | 8.2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1143769 | |
| Dec 28, 2020 | Iron, Total Recoverable | .43 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1141804 | |
| Dec 28, 2020 | Oil and Grease | 3.2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1141804 | |
| Dec 28, 2020 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1141804 | |
| Dec 28, 2020 | Total Suspended Solids (TSS) | 38 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1141804 | |
| Dec 04, 2019 | Iron, Total Recoverable | .45 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1098345 | |
| Dec 04, 2019 | Oil and Grease | 2.6 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1098345 | |
| Dec 04, 2019 | pH | 8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1098345 | |
| Dec 04, 2019 | Total Suspended Solids (TSS) | 16 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1098345 | |
| Nov 27, 2019 | Iron, Total Recoverable | .46 | mg/L | Effluent | Qualifying Storm Event | E200.7 | 1094090 | |
| Nov 27, 2019 | Oil and Grease | 1.8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1094090 |
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 | 1 | 1 Violation · 0 Potential (preliminary) · 0 Dismissed | Jul 16, 2026 – Jul 16, 2026 | Oct 21, 2026 | All violations |
| Enforcement actions | 2 | 2 issued · 0 draft · 0 withdrawn, rescinded or superseded | Aug 13, 2007 – Jul 22, 2026 | Oct 21, 2026 | All actions |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| 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 (14 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Aug 07, 2026 | Annual reports | 1335746 | Annual report 2025 | — | |
| Jul 22, 2026 | Enforcement actions | 471064 | NOV (Notice of Violation) | Active | |
| Jul 16, 2026 | Violations | 905141 | Late Report | Violation | Report |
| Jun 16, 2025 | Annual reports | 1294581 | Annual report 2024 | — | |
| Jun 14, 2024 | Annual reports | 1243689 | Annual report 2023 | — | |
| Jul 06, 2023 | Annual reports | 1189715 | Annual report 2022 | — | |
| Jun 29, 2022 | Annual reports | 1113121 | Annual report 2021 | — | |
| Jun 26, 2021 | Annual reports | 1069149 | Annual report 2020 | — | |
| Jul 04, 2020 | Annual reports | 986447 | Annual report 2019 | — | |
| Jul 11, 2019 | Annual reports | 954022 | Annual report 2018 | — | |
| Jul 13, 2018 | Annual reports | 939441 | Annual report 2017 | — | |
| Jul 06, 2017 | Annual reports | 878708 | Annual report 2016 | — | |
| Jun 23, 2016 | Annual reports | 844497 | Annual report 2015 | — | |
| Aug 13, 2007 | Enforcement actions | 330093 | NOV (Notice of Violation) | Active |
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.