Western Municipal Water District
Active WDID 8 33I029044 Riverside, Riverside County Region 8 · Santa Ana
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Riverside, Riverside County
- Region 8 · Santa Ana · Location · Statewide map
- Receiving water
- Unidentified Water 334, 390, and 460 (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
- None
- Monitoring results Evidence: facility-reported
- 73 distinct results, 5 reporting years (2021 to 2025)
- Most recent sample Feb 16, 2026 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 0 inspections · 1 violation record · 1 enforcement action
- 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
- 33.86649, -117.26408
- 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
- 22751 Nandina Avenue, Riverside 92518
- Regional Water Board
- 8 — Santa Ana
HUC12 watershed Evidence: spatial
- Perris Reservoir HUC12 180702020305
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
- Western Municipal Water District
- Primary industry (SIC)
- 4952-Sewerage Systems
- Application ID
- 530705
- NOI processed
- Jan 27, 2021
- Last certified
- Feb 06, 2024
- Facility size
- 30 Acres
- Impervious area
- 75 %
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 530705 | Industrial | Active | Jan 27, 2021 | — | Feb 06, 2024 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Unidentified Water 334, 390, and 460
- Discharges directly / indirectly
- N / N (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.
No 2026 Integrated Report waterbody lies within the proximity threshold of the reported location.
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.
73 distinct measurements across 3 parameters, most recent sample Feb 16, 2026.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2025 | 18 | 3 | 0 | Oct 14, 2025 | Feb 16, 2026 |
| 2024 | 7 | 3 | 0 | Mar 13, 2025 | Apr 26, 2025 |
| 2023 | 18 | 3 | 0 | Aug 20, 2023 | Feb 01, 2024 |
| 2022 | 18 | 3 | 0 | Nov 08, 2022 | Feb 25, 2023 |
| 2021 | 12 | 3 | 0 | Dec 14, 2021 | Dec 23, 2021 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| pH | SU | 25 | 0 | Dec 14, 2021 | Feb 16, 2026 | Results |
| Total Suspended Solids (TSS) | mg/L | 25 | 0 | Dec 14, 2021 | Feb 16, 2026 | Results |
| Oil and Grease | mg/L | 23 | 20 | Dec 14, 2021 | Feb 16, 2026 | Results |
All results (73 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Feb 16, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1368447 | |
| Feb 16, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1368447 | |
| Feb 16, 2026 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368447 | |
| Feb 11, 2026 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1368233 | |
| Feb 11, 2026 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1368233 | |
| Feb 11, 2026 | Total Suspended Solids (TSS) | 2 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1368233 | |
| Nov 15, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360667 | |
| Nov 15, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1360667 | |
| Nov 15, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360667 | |
| Nov 15, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1360667 | |
| Nov 15, 2025 | Total Suspended Solids (TSS) | 150 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360667 | |
| Nov 15, 2025 | Total Suspended Solids (TSS) | 96 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1360667 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1357132 | |
| Oct 14, 2025 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1357132 | |
| Oct 14, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357132 | |
| Oct 14, 2025 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1357132 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 13 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357132 | |
| Oct 14, 2025 | Total Suspended Solids (TSS) | 23 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1357132 | |
| Apr 26, 2025 | Oil and Grease | 3.7 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1331120 | |
| Apr 26, 2025 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1331120 | |
| Apr 26, 2025 | Total Suspended Solids (TSS) | 27 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1331120 | |
| Mar 13, 2025 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1327911 | |
| Mar 13, 2025 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1327911 | |
| Mar 13, 2025 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1327911 | |
| Mar 13, 2025 | Total Suspended Solids (TSS) | 15 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1327911 | |
| Feb 01, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1279334 | |
| Feb 01, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1279334 | |
| Feb 01, 2024 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1279334 | |
| Feb 01, 2024 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1279334 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 20 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279334 | |
| Feb 01, 2024 | Total Suspended Solids (TSS) | 250 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1279334 | |
| Jan 03, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1273063 | |
| Jan 03, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1273063 | |
| Jan 03, 2024 | pH | 7.8 | SU | Effluent | Qualifying Storm Event | pH_Field | 1273063 | |
| Jan 03, 2024 | pH | 8.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1273063 | |
| Jan 03, 2024 | Total Suspended Solids (TSS) | 40 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273063 | |
| Jan 03, 2024 | Total Suspended Solids (TSS) | 23 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1273063 | |
| Aug 20, 2023 | Oil and Grease | 4.7 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1266515 | |
| Aug 20, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1266515 | |
| Aug 20, 2023 | pH | 7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1266515 | |
| Aug 20, 2023 | pH | 6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1266515 | |
| Aug 20, 2023 | Total Suspended Solids (TSS) | 25 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1266515 | |
| Aug 20, 2023 | Total Suspended Solids (TSS) | 78 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1266515 | |
| Feb 25, 2023 | Oil and Grease | 1.9 | mg/L | Effluent | Qualifying Storm Event | E1664B | 1228815 | |
| Feb 25, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1228815 | |
| Feb 25, 2023 | pH | 8.6 | SU | Effluent | Qualifying Storm Event | pH_Field | 1228815 | |
| Feb 25, 2023 | pH | 8.5 | SU | Effluent | Qualifying Storm Event | pH_Field | 1228815 | |
| Feb 25, 2023 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1228815 | |
| Feb 25, 2023 | Total Suspended Solids (TSS) | 9 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1228815 | |
| Jan 14, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1224177 |
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 | Dec 05, 2021 – Dec 05, 2021 | Oct 21, 2026 | All violations |
| Enforcement actions | 1 | 1 issued · 0 draft · 0 withdrawn, rescinded or superseded | Dec 08, 2021 – Dec 08, 2021 | Oct 21, 2026 | All actions |
| Inspections | 0 | inspections, not findings | — | Oct 21, 2026 | |
| Annual reports | 6 | certified reports (contents not shown) | 2020 – 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 (8 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 07, 2026 | Annual reports | 1340625 | Annual report 2025 | — | |
| Jul 07, 2025 | Annual reports | 1299773 | Annual report 2024 | — | |
| Jul 02, 2024 | Annual reports | 1249144 | Annual report 2023 | — | |
| Jul 13, 2023 | Annual reports | 1195448 | Annual report 2022 | — | |
| Jul 07, 2022 | Annual reports | 1157148 | Annual report 2021 | — | |
| Dec 08, 2021 | Enforcement actions | 444237 | Verbal Communication | Active | |
| Dec 05, 2021 | Violations | 880307 | Unauthorized NSWD | Violation | Report |
| Jul 01, 2021 | Annual reports | 1140064 | Annual report 2020 | — |
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.