Sierra Circuits Inc
Active WDID 2 43I006923 Sunnyvale, Santa Clara County Region 2 · San Francisco Bay
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Sunnyvale, Santa Clara County
- Region 2 · San Francisco Bay · Location · Statewide map
- Receiving water
- San Francisco Bay (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
- None
- Monitoring results Evidence: facility-reported
- 189 distinct results, 8 reporting years (2015 to 2023)
- Most recent sample Jan 22, 2024 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 1 inspection · 1 violation record · 0 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
- 37.38442, -122.0489
- Precision
- 4 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
- 1108 West Evelyn Ave, Sunnyvale 94086
- Regional Water Board
- 2 — San Francisco Bay
HUC12 watershed Evidence: spatial
- Calabazas Creek-Frontal San Francisco Bay Estuaries HUC12 180500030405
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
- Sierra Circuits Inc
- Primary industry (SIC)
- 3672-Printed Circuit Boards
- Application ID
- 183957
- NOI processed
- May 08, 1992
- Last certified
- Jul 08, 2019
- Facility size
- 17920 SqFt
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 183957 | Industrial | Active | May 08, 1992 | — | Jul 08, 2019 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- San Francisco Bay
- Discharges directly / indirectly
- N / N (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
3 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.
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.
189 distinct measurements across 3 parameters, most recent sample Jan 22, 2024.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2023 | 24 | 3 | 0 | Dec 07, 2023 | Jan 22, 2024 |
| 2021 | 24 | 3 | 0 | Dec 07, 2021 | Mar 28, 2022 |
| 2020 | 21 | 3 | 0 | Dec 07, 2020 | Mar 10, 2021 |
| 2019 | 24 | 3 | 0 | Dec 04, 2019 | Jan 16, 2020 |
| 2018 | 24 | 3 | 0 | Nov 21, 2018 | Jan 31, 2019 |
| 2017 | 24 | 3 | 0 | Nov 10, 2017 | Feb 26, 2018 |
| 2016 | 24 | 3 | 0 | Oct 28, 2016 | Mar 24, 2017 |
| 2015 | 24 | 3 | 0 | Nov 02, 2015 | Mar 11, 2016 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| Oil and Grease | mg/L | 63 | 46 | Nov 02, 2015 | Jan 22, 2024 | Results |
| pH | SU | 63 | 0 | Nov 02, 2015 | Jan 22, 2024 | Results |
| Total Suspended Solids (TSS) | mg/L | 63 | 7 | Nov 02, 2015 | Jan 22, 2024 | Results |
All results (189 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Jan 22, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Jan 22, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Jan 22, 2024 | pH | 6.2 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Jan 22, 2024 | pH | 6.2 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Jan 22, 2024 | Total Suspended Solids (TSS) | 3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Jan 22, 2024 | Total Suspended Solids (TSS) | 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Jan 10, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Jan 10, 2024 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Jan 10, 2024 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Jan 10, 2024 | pH | 6.4 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Jan 10, 2024 | Total Suspended Solids (TSS) | 3 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Jan 10, 2024 | Total Suspended Solids (TSS) | 6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Dec 18, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Dec 18, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Dec 18, 2023 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Dec 18, 2023 | pH | 6.3 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Dec 18, 2023 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Dec 07, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Dec 07, 2023 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1287261 | |
| Dec 07, 2023 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Dec 07, 2023 | pH | 6.8 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1287261 | |
| Dec 07, 2023 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Dec 07, 2023 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1287261 | |
| Mar 28, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Mar 28, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Mar 28, 2022 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Mar 28, 2022 | pH | 6.6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Mar 28, 2022 | Total Suspended Solids (TSS) | 18 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Mar 28, 2022 | Total Suspended Solids (TSS) | 11 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Mar 03, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Mar 03, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Mar 03, 2022 | pH | 6.6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Mar 03, 2022 | pH | 6.6 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Mar 03, 2022 | Total Suspended Solids (TSS) | 4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Mar 03, 2022 | Total Suspended Solids (TSS) | 6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Dec 13, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Dec 13, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Dec 13, 2021 | pH | 6.3 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Dec 13, 2021 | pH | 6.4 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Dec 13, 2021 | Total Suspended Solids (TSS) | 6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Dec 13, 2021 | Total Suspended Solids (TSS) | 17 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Dec 07, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Dec 07, 2021 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664B | 1186658 | |
| Dec 07, 2021 | pH | 6.3 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Dec 07, 2021 | pH | 6.5 | SU | Effluent | Qualifying Storm Event | pH_Paper | 1186658 | |
| Dec 07, 2021 | Total Suspended Solids (TSS) | 10 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Dec 07, 2021 | Total Suspended Solids (TSS) | 6 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1186658 | |
| Mar 10, 2021 | Oil and Grease | 1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1153399 | |
| Mar 10, 2021 | Oil and Grease | 1 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1153399 |
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 02, 1999 – Jul 02, 1999 | Oct 21, 2026 | All violations |
| Enforcement actions | 0 | 0 issued · 0 draft · 0 withdrawn, rescinded or superseded | — | Oct 21, 2026 | |
| Inspections | 1 | inspections, not findings | May 25, 2023 – May 25, 2023 | 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 (13 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| May 12, 2026 | Annual reports | 1335218 | Annual report 2025 | — | |
| Jun 12, 2025 | Annual reports | 1294023 | Annual report 2024 | — | |
| Jun 06, 2024 | Annual reports | 1243103 | Annual report 2023 | — | |
| Jun 06, 2023 | Annual reports | 1189098 | Annual report 2022 | — | |
| May 25, 2023 | Inspections | 2060457 | B Type compliance | Finalized | Additional Info Required |
| Jun 15, 2022 | Annual reports | 1112458 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1068462 | Annual report 2020 | — | |
| Jun 23, 2020 | Annual reports | 985704 | Annual report 2019 | — | |
| Jul 11, 2019 | Annual reports | 953252 | Annual report 2018 | — | |
| Mar 29, 2018 | Annual reports | 938668 | Annual report 2017 | — | |
| Apr 23, 2017 | Annual reports | 877894 | Annual report 2016 | — | |
| Jun 06, 2016 | Annual reports | 846290 | Annual report 2015 | — | |
| Jul 02, 1999 | Violations | 137759 | Deficient Report | Violation | Inspection |
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.