Industrial stormwater facility
WDID 2 07I019062 · Notice of Intent · Walnut Creek, Contra Costa
SIC 4111 · Local and Suburban Transit · Regional Board 2 - San Francisco Bay Region
Hydrologic
Official facility coordinate plotted against the associated Final 2026 Integrated Report impaired-water geometry.
Geometry shown is limited to waterbodies geographically associated with this facility. Geographic association does not establish a discharge connection, receiving-water connectivity, or causation.
Intelligence summary
What is available for this facility across the connected datasets.
Official
303(d) context
Grouped by derived geographic association class.
Lake & Reservoir · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (2) Mercury, PCBs (Polychlorinated biphenyls)
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (2) Benthic Community Effects, Toxicity
Associations are calculated from official facility coordinates, USGS HUC12 boundaries, and official 2026 impaired-water geometry. They do not establish a discharge connection or causation.
Water Board-stated TMDL waste load allocations applied to this industrial permit in SMARTS.
No SMARTS TMDL requirement is recorded for this WDID. In the statewide TMDL export only permits in Regions 4, 8 and 9 currently carry industrial TMDL requirements, so an absence here is not a statement that the facility discharges to an unimpaired water.
Official monitoring
Self-reported industrial stormwater sampling results as submitted by the discharger to SMARTS.
Loading reported results…
| Sample date | Location | Parameter | Result | Units | Event |
|---|---|---|---|---|---|
| 2026-05-28 | Outfall 1 | Oil and Grease | 1.7 | mg/L | Qualifying Storm Event |
| 2026-05-28 | Outfall 1 | pH | 7.4 | SU | Qualifying Storm Event |
| 2026-05-28 | Outfall 1 | Total Suspended Solids (TSS) | 45 | mg/L | Qualifying Storm Event |
| 2025-11-13 | Outfall 1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-11-13 | Outfall 1 | pH | 7.85 | SU | Qualifying Storm Event |
| 2025-11-13 | Outfall 1 | Total Suspended Solids (TSS) | 11 | mg/L | Qualifying Storm Event |
| 2025-10-02 | Outfall 1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2025-10-02 | Outfall 1 | pH | 7.83 | SU | Qualifying Storm Event |
| 2025-10-02 | Outfall 1 | Total Suspended Solids (TSS) | 18 | mg/L | Qualifying Storm Event |
| 2025-02-13 | Outfall 1 | Oil and Grease | 1.6 | mg/L | Qualifying Storm Event |
| 2025-02-13 | Outfall 1 | pH | 7.8 | SU | Qualifying Storm Event |
| 2025-02-13 | Outfall 1 | Total Suspended Solids (TSS) | 41 | mg/L | Qualifying Storm Event |
| 2024-12-12 | Outfall 1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2024-12-12 | Outfall 1 | pH | 7.85 | SU | Qualifying Storm Event |
| 2024-12-12 | Outfall 1 | Total Suspended Solids (TSS) | 8.3 | mg/L | Qualifying Storm Event |
| 2024-01-24 | Outfall 1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2024-01-24 | Outfall 1 | pH | 7.57 | SU | Qualifying Storm Event |
| 2024-01-24 | Outfall 1 | Total Suspended Solids (TSS) | 24 | mg/L | Qualifying Storm Event |
| 2024-01-24 | Outfall 1 | Zinc | .059 | mg/L | Qualifying Storm Event |
| 2024-01-03 | Outfall 1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2024-01-03 | Outfall 1 | pH | 7.82 | SU | Qualifying Storm Event |
| 2024-01-03 | Outfall 1 | Total Suspended Solids (TSS) | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2024-01-03 | Outfall 1 | Zinc | .039 | mg/L | Qualifying Storm Event |
| 2023-12-18 | Outfall 1 | Oil and Grease | 1.6 | mg/L | Qualifying Storm Event |
| 2023-12-18 | Outfall 1 | pH | 7.9 | SU | Qualifying Storm Event |
Monitoring rows are official self-reported SMARTS submissions, joined to this facility by WDID. California Stormwater Intelligence does not restate, correct, average or evaluate reported values, and no benchmark comparison or violation determination is made.
YDOS-derived
Reported SMARTS analytical results compared against the Numeric Action Levels of the Industrial General Permit version in effect for each reporting year (July 1 – June 30).
| Parameter | NAL type | Calculated value | NAL | Result | Samples used | Method |
|---|---|---|---|---|---|---|
Oil and Grease oil_grease | Instantaneous maximum | —0 samples above | 25 mg/L | At or below NALNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 3 eligible2 non-detect as zero | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
pH ph | Instantaneous maximum | —0 samples above | 6 – 9 pH units | Within NAL rangeNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 3 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Total Suspended Solids (TSS) tss | Instantaneous maximum | —0 samples above | 400 mg/L | At or below NALNo eligible result in this reporting year was outside the instantaneous maximum NAL. | 3 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
An NAL exceedance is a permit-defined condition that triggers Exceedance Response Actions under the Industrial General Permit. It is not a violation, an enforcement action, or a Water Board compliance determination. Annual values use the arithmetic average of eligible results with non-detects treated as zero; instantaneous maximum NALs (total suspended solids, oil and grease, pH) are exceeded when two or more eligible results in a reporting year fall outside the level. Rules transcribed from 2014-0057-DWQ as amended by 2015-0122-DWQ ↗ (effective 2015-07-01, superseded 2020-06-30); 2014-0057-DWQ as amended by 2018-0028-DWQ ↗ (effective 2020-07-01).
Documents
Attachment inventory recorded in the State Water Board SMARTS public attachment workflow for this permit.
No document inventory has been indexed for this permit yet. The statewide document index is being built out; coverage is reported on the data-freshness panel.
Attachments for this permit remain viewable in the source system. Open the SMARTS public workflow ↗
Enforcement
Enforcement actions as recorded by the State Water Board for this permit, in the source system's own terminology.
Structured enforcement records are not yet connected for this site. The absence of a record is not a finding about this facility.
Reporting
Annual report and Exceedance Response Action information as stated by the source system, distinguished from what is inferred from document metadata.
Structured reporting and ERA records are not yet connected for this site.
Recent activity
New or changed source records this platform detected for this permit, newest first.
No source change has been detected for this permit yet. Change detection begins from the date each dataset was first indexed.
Provenance