Grass Valley City WWTP
Active WDID 5S29I006044 Grass Valley, Nevada County Region 5S · Central Valley (Sacramento)
At a glance
- Permit Evidence: SMARTS record
- Active Industrial
- Notice of Intent (WDID code I) · Permits and applications
- Location Evidence: facility-reported
- Grass Valley, Nevada County
- Region 5S · Central Valley (Sacramento) · Location · Statewide map
- Receiving water
- Wolf Creek (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
- 291 distinct results, 6 reporting years (2016 to 2022)
- Most recent sample Dec 01, 2022 · Monitoring
- Compliance and enforcement records Evidence: SMARTS record
- 2 inspections · 4 violation records · 4 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
- 39.20544, -121.06867
- 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
- 556C Freeman, Grass Valley 95945
- Regional Water Board
- 5S — Central Valley (Sacramento)
HUC12 watershed Evidence: spatial
- Rattlesnake Creek-Wolf Creek HUC12 180201260202
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
- Grass Valley City
- Primary industry (SIC)
- 4952-Sewerage Systems
- Application ID
- 198636
- NOI processed
- Apr 20, 1992
- Last certified
- Feb 24, 2015
- Facility size
- 30 Acres
Retrieved from SMARTS Oct 20, 2026. Verify against SMARTS before relying on it.
Permit history
| Application | Type | Status | Processed | Terminated | Certified |
|---|---|---|---|---|---|
| 198636 | Industrial | Active | Apr 20, 1992 | — | Feb 24, 2015 |
Every storm water application SMARTS records for this WDID, newest first (1).
Receiving water
- Reported by the facility Evidence: facility-reported
- Wolf Creek
- Discharges directly / indirectly
- Y / 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.
| Waterbody (2026 Integrated Report) | Distance | 2026 303(d) list | Appendix A decisions |
|---|---|---|---|
| Wolf Creek (Nevada County) CAR5163201020011212113551 | 55 m | listed | 1 |
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.
291 distinct measurements across 6 parameters, most recent sample Dec 01, 2022.
By reporting year
| Reporting year (July–June) | Distinct results | Parameters | With several versions | First sample | Last sample |
|---|---|---|---|---|---|
| 2022 | 30 | 5 | 0 | Nov 01, 2022 | Dec 01, 2022 |
| 2020 | 45 | 5 | 0 | Nov 13, 2020 | Jan 22, 2021 |
| 2019 | 45 | 5 | 0 | Dec 18, 2019 | May 12, 2020 |
| 2018 | 60 | 5 | 0 | Oct 04, 2018 | Feb 13, 2019 |
| 2017 | 45 | 5 | 0 | Nov 09, 2017 | Mar 01, 2018 |
| 2016 | 66 | 6 | 0 | Oct 14, 2016 | Mar 21, 2017 |
By parameter
| Parameter | Units | Measurements | Below detection | First sample | Last sample | Results |
|---|---|---|---|---|---|---|
| E.coli | MPN/100 mL | 58 | 0 | Oct 14, 2016 | Dec 01, 2022 | Results |
| Enterococci MPN | MPN/100 mL | 58 | 2 | Oct 14, 2016 | Dec 01, 2022 | Results |
| Oil and Grease | mg/L | 58 | 46 | Oct 14, 2016 | Dec 01, 2022 | Results |
| pH | SU | 58 | 0 | Oct 14, 2016 | Dec 01, 2022 | Results |
| Total Suspended Solids (TSS) | mg/L | 58 | 2 | Oct 14, 2016 | Dec 01, 2022 | Results |
| Electrical Conductivity @ 25 Deg. C | umhos/cm | 1 | 0 | Mar 21, 2017 | Mar 21, 2017 | Results |
All results (291 distinct rows)
| Sample date | Parameter | Result | Units | Location type | Event | Method | Report | Versions |
|---|---|---|---|---|---|---|---|---|
| Dec 01, 2022 | E.coli | 410.6 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221F | 1238538 | |
| Dec 01, 2022 | E.coli | 1119.9 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221F | 1238538 | |
| Dec 01, 2022 | E.coli | 9.7 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221F | 1238538 | |
| Dec 01, 2022 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1238538 | |
| Dec 01, 2022 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1238538 | |
| Dec 01, 2022 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1238538 | |
| Dec 01, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238538 | |
| Dec 01, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238538 | |
| Dec 01, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238538 | |
| Dec 01, 2022 | pH | 6.66 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238538 | |
| Dec 01, 2022 | pH | 6.82 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238538 | |
| Dec 01, 2022 | pH | 6.73 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238538 | |
| Dec 01, 2022 | Total Suspended Solids (TSS) | 23 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238538 | |
| Dec 01, 2022 | Total Suspended Solids (TSS) | 14 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238538 | |
| Dec 01, 2022 | Total Suspended Solids (TSS) | 5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238538 | |
| Nov 01, 2022 | E.coli | 75.9 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221F | 1238417 | |
| Nov 01, 2022 | E.coli | 285.1 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221F | 1238417 | |
| Nov 01, 2022 | E.coli | 48.7 | MPN/100 mL | Effluent | Qualifying Storm Event | A9221F | 1238417 | |
| Nov 01, 2022 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1238417 | |
| Nov 01, 2022 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1238417 | |
| Nov 01, 2022 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1238417 | |
| Nov 01, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238417 | |
| Nov 01, 2022 | Oil and Grease | ND | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238417 | |
| Nov 01, 2022 | Oil and Grease | 38 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1238417 | |
| Nov 01, 2022 | pH | 6.42 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238417 | |
| Nov 01, 2022 | pH | 6.99 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238417 | |
| Nov 01, 2022 | pH | 7.19 | SU | Effluent | Qualifying Storm Event | pH_Field | 1238417 | |
| Nov 01, 2022 | Total Suspended Solids (TSS) | 27 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238417 | |
| Nov 01, 2022 | Total Suspended Solids (TSS) | 20 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238417 | |
| Nov 01, 2022 | Total Suspended Solids (TSS) | 14.5 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1238417 | |
| Jan 22, 2021 | E.coli | > 2419.2 | MPN/100 mL | Effluent | Qualifying Storm Event | A9223B | 1153979 | |
| Jan 22, 2021 | E.coli | > 2419.2 | MPN/100 mL | Effluent | Qualifying Storm Event | A9223B | 1153979 | |
| Jan 22, 2021 | E.coli | > 2419.2 | MPN/100 mL | Effluent | Qualifying Storm Event | A9223B | 1153979 | |
| Jan 22, 2021 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1153979 | |
| Jan 22, 2021 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1153979 | |
| Jan 22, 2021 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1153979 | |
| Jan 22, 2021 | Oil and Grease | 2 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1153979 | |
| Jan 22, 2021 | Oil and Grease | 1.3 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1153979 | |
| Jan 22, 2021 | Oil and Grease | .8 | mg/L | Effluent | Qualifying Storm Event | E1664A | 1153979 | |
| Jan 22, 2021 | pH | 7.38 | SU | Effluent | Qualifying Storm Event | pH_Field | 1153979 | |
| Jan 22, 2021 | pH | 7.19 | SU | Effluent | Qualifying Storm Event | pH_Field | 1153979 | |
| Jan 22, 2021 | pH | 6.7 | SU | Effluent | Qualifying Storm Event | pH_Field | 1153979 | |
| Jan 22, 2021 | Total Suspended Solids (TSS) | 39 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1153979 | |
| Jan 22, 2021 | Total Suspended Solids (TSS) | 23 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1153979 | |
| Jan 22, 2021 | Total Suspended Solids (TSS) | 5.4 | mg/L | Effluent | Qualifying Storm Event | A2540D | 1153979 | |
| Dec 17, 2020 | E.coli | 60.9 | MPN/100 mL | Effluent | Qualifying Storm Event | A9223B | 1153969 | |
| Dec 17, 2020 | E.coli | 365.4 | MPN/100 mL | Effluent | Qualifying Storm Event | A9223B | 1153969 | |
| Dec 17, 2020 | E.coli | 58.5 | MPN/100 mL | Effluent | Qualifying Storm Event | A9223B | 1153969 | |
| Dec 17, 2020 | Enterococci MPN | > 2420 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1153969 | |
| Dec 17, 2020 | Enterococci MPN | 1410 | MPN/100 mL | Effluent | Qualifying Storm Event | E600-8-78-017 | 1153969 |
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 | 4 | 4 Violation · 0 Potential (preliminary) · 0 Dismissed | Mar 30, 2006 – Aug 15, 2015 | Oct 21, 2026 | All violations |
| Enforcement actions | 4 | 4 issued · 0 draft · 0 withdrawn, rescinded or superseded | Mar 30, 2007 – Sep 16, 2015 | Oct 21, 2026 | All actions |
| Inspections | 2 | inspections, not findings | Jun 26, 2001 – Jan 09, 2002 | 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 (21 records, newest first)
| Date | Record | ID | Type or purpose | Status as published | Detail |
|---|---|---|---|---|---|
| Jul 16, 2026 | Annual reports | 1334594 | Annual report 2025 | — | |
| Jul 14, 2025 | Annual reports | 1293384 | Annual report 2024 | — | |
| Jul 01, 2024 | Annual reports | 1242412 | Annual report 2023 | — | |
| Jul 14, 2023 | Annual reports | 1188372 | Annual report 2022 | — | |
| Jun 17, 2022 | Annual reports | 1111670 | Annual report 2021 | — | |
| Jul 13, 2021 | Annual reports | 1067634 | Annual report 2020 | — | |
| Jul 14, 2020 | Annual reports | 984823 | Annual report 2019 | — | |
| Jul 09, 2019 | Annual reports | 952336 | Annual report 2018 | — | |
| Jul 20, 2018 | Annual reports | 937749 | Annual report 2017 | — | |
| Jul 10, 2017 | Annual reports | 876931 | Annual report 2016 | — | |
| Jul 14, 2016 | Annual reports | 840490 | Annual report 2015 | — | |
| Sep 16, 2015 | Enforcement actions | 420391 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Aug 15, 2015 | Violations | 858181 | Late Report | Violation | Report |
| Aug 16, 2013 | Enforcement actions | 413404 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 02, 2013 | Violations | 851958 | Late Report | Violation | Report |
| Jul 23, 2009 | Enforcement actions | 400470 | 1st NNC - AR (First Notice of Non-Compliance (annual report)) | Historical | |
| Jul 02, 2009 | Violations | 840297 | Late Report | Violation | Report |
| Mar 30, 2007 | Enforcement actions | 325279 | NOV (Notice of Violation) | Active | |
| Mar 30, 2006 | Violations | 496699 | Deficient Report | Violation | Report |
| Jan 09, 2002 | Inspections | 325871 | B Type compliance | — | |
| Jun 26, 2001 | Inspections | 324454 | B Type compliance | — |
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.