Industrial stormwater facility
WDID 1 12I025790 · Notice of Intent · Arcata, Humboldt
SIC 2875 · Fertilizers, Mixing Only · Regional Board 1 - North Coast 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.
River & Stream · Integrated Report category 5 · TMDL required
Listed pollutants / stressors (6) Aluminum, Sediment, Sedimentation/Siltation, Specific Conductivity, Temperature, water, Turbidity
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 |
|---|---|---|---|---|---|
| 2026-04-01 | DP-1 | Chemical oxygen demand (COD) | 22 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Iron | .41 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Lead | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Nitrate | 2.7 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Nitrate/Nitrite (Nitrite + Nitrate as N) | 2.7 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Nitrogen, Nitrite | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | pH | 7.6 | SU | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Phosphorus | .14 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Total Suspended Solids (TSS) | 5.9 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-1 | Zinc | .027 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Chemical oxygen demand (COD) | 13 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Iron | .55 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Lead | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Nitrate | 3.5 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Nitrate/Nitrite (Nitrite + Nitrate as N) | 3.5 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Nitrogen, Nitrite | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Oil and Grease | ND —(non-detect / est.) | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | pH | 7.5 | SU | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Phosphorus | .15 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Total Suspended Solids (TSS) | 7.5 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-2 | Zinc | .15 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-3 | Chemical oxygen demand (COD) | 30 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-3 | Iron | .56 | mg/L | Qualifying Storm Event |
| 2026-04-01 | DP-3 | Lead | ND —(non-detect / est.) | mg/L | 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 |
|---|---|---|---|---|---|---|
Aluminum, Total aluminum_total | Annual | 0.374 mg/L | 0.75 mg/L | At or below NALAnnual average of 13 eligible result(s) compared with the annual NAL.0.5× threshold | 13 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
Chemical Oxygen Demand (COD) cod | Annual | 34.593 mg/L | 120 mg/L | At or below NALAnnual average of 27 eligible result(s) compared with the annual NAL.0.29× threshold | 27 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
Iron, Total iron_total | Annual | 1.086 mg/L | 1 mg/L | Above NALAnnual average of 27 eligible result(s) compared with the annual NAL.1.09× threshold | 27 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
Lead, Total lead_total | Annual | 0 mg/L | 0.262 mg/L | At or below NALAnnual average of 27 eligible result(s) compared with the annual NAL.0× threshold | 27 eligible27 non-detect as zero | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
Nitrite Plus Nitrate (as N) nitrate_nitrite_n | Annual | 0.651 mg/L as N | 0.68 mg/L as N | At or below NALAnnual average of 20 eligible result(s) compared with the annual NAL.0.96× threshold | 20 eligible7 non-detect as zero | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
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. | 27 eligible27 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. | 27 eligible | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Phosphorus, Total (as P) phosphorus_total | Annual | 0.529 mg/L as P | 2 mg/L as P | At or below NALAnnual average of 27 eligible result(s) compared with the annual NAL.0.26× threshold | 27 eligible | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
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. | 27 eligible3 non-detect as zero | count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year |
Zinc, Total zinc_total | Annual | 0.043 mg/L | 0.26 mg/L | At or below NALAnnual average of 27 eligible result(s) compared with the annual NAL.0.17× threshold | 27 eligible4 non-detect as zero | arithmetic mean of all eligible effluent results in the July 1 - June 30 reporting year (censored results assigned zero only where MDL and ML were both reported) |
YDOS-derived overlap
Parameters where this facility has an NAL exceedance in at least one reporting year and the geographically associated waterbody carries a 303(d) listing for the same pollutant.
AluminumMonitoringAbove NAL303(d) impairmentMad River HU, Mad River
3 reporting years above the annual NAL, most recently RY 2023 · 1 303(d) listing · association: derived nearby in watershed (high confidence)
Overlap is informational co-occurrence between a derived NAL comparison and an official 303(d) listing. It is not evidence that this facility caused or contributed to the impairment.
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.
Metadata indicators
DerivedDocument indicators are YDOS-derived counts and dates calculated from SMARTS attachment metadata. They describe what is on file, not whether a facility complied with any requirement.
116 substantive of 168 indexed attachments
SWPPP Amendment #9
Source file type SWPPP · 2026-04-01 · 332 KB
SWPPP Amendment #9
Source file type SWPPP · 2026-03-25 · 332 KB
SWPPP amendment 7
Source file type SWPPP · 2022-06-10 · 1.1 MB
offsite map
Source file type Facility/Site Map · 2022-03-16 · 1.2 MB
SWPPP amendment
Source file type SWPPP · 2022-03-16 · 39.7 MB
SWPPP amendment
Source file type SWPPP · 2021-07-02 · 39.7 MB
Site Maps
Source file type Facility/Site Map · 2021-07-01 · 3.5 MB
Royal Gold IGP SWPPP
Source file type SWPPP · part 1/1 · 2017-10-17 · 35.7 MB
Royal Gold SWPPP 12-30-2016
Source file type SWPPP · part 1/1 · 2016-12-30 · 36.9 MB
2012 Site Map
Source file type Facility/Site Map · part 1/1 · 2016-10-05 · 887 KB
Royal Gold SWPPP
Source file type SWPPP · part 1/1 · 2015-08-12 · 9.2 MB
Royal Gold Site Map
Source file type Facility/Site Map · part 1/1 · 2015-08-12 · 4.3 MB
Submitted report pdf
Source file type Submitted Report PDF · 2026-07-13 · 1.0 MB
Submitted report pdf
Source file type Submitted Report PDF · 2026-05-05 · 414 KB
Submitted report pdf
Source file type Submitted Report PDF · 2026-04-01 · 413 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-12-03 · 415 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-11-17 · 413 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-07-14 · 1003 KB
Submitted report pdf
Source file type Submitted Report PDF · 2025-06-09 · 415 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-12-20 · 416 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-07-09 · 418 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-07-09 · 1003 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-01-12 · 417 KB
Submitted report pdf
Source file type Submitted Report PDF · 2024-01-12 · 417 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-07-31 · 1003 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-07-10 · 1003 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-06-08 · 419 KB
Submitted report pdf
Source file type Submitted Report PDF · 2023-01-12 · 420 KB
Submitted report pdf
Source file type Submitted Report PDF · 2022-06-09 · 419 KB
Submitted report pdf
Source file type Submitted Report PDF · 2022-06-09 · 1003 KB
Submitted report pdf
Source file type Submitted Report PDF · 2022-03-01 · 418 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-07-02 · 1003 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-06-17 · 413 KB
Submitted report pdf
Source file type Submitted Report PDF · 2021-02-11 · 108 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-06-24 · 999 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-06-17 · 111 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-02-13 · 112 KB
Submitted report pdf
Source file type Submitted Report PDF · 2020-01-06 · 113 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-04-11 · 112 KB
Submitted report pdf
Source file type Submitted Report PDF · 2019-04-11 · 109 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-12-31 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-07-16 · 11 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-07-11 · 411 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-02-13 · 411 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-01-12 · 411 KB
Submitted report pdf
Source file type Submitted Report PDF · 2018-01-09 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2017-12-29 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2017-07-12 · 911 KB
Submitted report pdf
Source file type Submitted Report PDF · 2017-05-25 · 412 KB
Submitted report pdf
Source file type Submitted Report PDF · 2017-02-08 · 410 KB
Submitted report pdf
Source file type Submitted Report PDF · 2017-01-18 · 405 KB
Submitted report pdf
Source file type Submitted Report PDF · 2016-07-13 · 408 KB
Submitted report pdf
Source file type Submitted Report PDF · 2016-07-13 · 911 KB
ERA Level 2 Technical Report, Aluminum (Total)
Source file type Level 2 Technical Report · 2025-12-30 · 3.2 MB
20241230-RG-Level2APAlandFe
Source file type Level 2 ERA Action Plan · 2024-12-31 · 638 KB
Level 2 Technical Report update
Source file type Level 2 Technical Report · 2023-12-29 · 453 KB
ERA Level 2Technical Report – Iron
Source file type Level 2 Technical Report · 2022-12-27 · 606 KB
Exceedance Response Action Level 2 Action Plan–Iron
Source file type Level 2 ERA Action Plan · 2022-01-03 · 711 KB
ERA Level 1 Al
Source file type Level 1 Technical Report · 2021-12-31 · 420 KB
Exceedance Response Action Level 2 Technical Report-Iron, Total Suspended Solids, and N+N
Source file type Level 2 ERA Action Plan · part 1/1 · 2019-07-01 · 3.9 MB
Level 2 Extension Request Letter
Source file type Level 2 Technical Report · part 1/1 · 2018-12-21 · 64 KB
Revised Exceedance Response Level 2 Action Plan
Source file type Level 2 ERA Action Plan · part 1/1 · 2018-12-21 · 4.1 MB
20180105 RG Level1ERA RptAl
Source file type Level 1 Technical Report · part 1/1 · 2018-01-05 · 2.3 MB
20171228 Royal Gold Level 2 ERA
Source file type Level 2 ERA Action Plan · part 1/1 · 2017-12-28 · 9.7 MB
Level 1 ERA Report
Source file type Level 1 Technical Report · part 1/1 · 2017-01-10 · 2.0 MB
Level 1 ERA Report
Source file type Level 1 Technical Report · part 1/1 · 2016-12-30 · 2.0 MB
093021 Final Inspection Report
Source file type Final Inspection Report · 2021-10-21 · 5.4 MB
Laboratory report
Source file type Laboratory Results · 2026-04-17 · 310 KB
Laboratory report
Source file type Laboratory Results · 2026-03-30 · 795 KB
Laboratory Report
Source file type Laboratory Results · 2025-12-02 · 806 KB
Laboratory Report
Source file type Laboratory Results · 2025-11-04 · 781 KB
Lab Results
Source file type Laboratory Results · 2025-06-06 · 1.1 MB
Lab Results
Source file type Laboratory Results · 2024-12-19 · 754 KB
2403365
Source file type Laboratory Results · part 1/1 · 2024-04-11 · 505 KB
2311044
Source file type Laboratory Results · part 1/1 · 2024-01-08 · 459 KB
Apr 17, 2023 lab rpt
Source file type Laboratory Results · 2023-05-17 · 434 KB
Dec 1, 2022 lab rpt
Source file type Laboratory Results · 2023-01-08 · 460 KB
Apr 11, 2022 lab rpt
Source file type Laboratory Results · 2022-04-27 · 456 KB
Dec 21, 2021 lab rpt
Source file type Laboratory Results · 2022-01-22 · 473 KB
Apr 26, 2021 lab rpt
Source file type Laboratory Results · 2021-06-04 · 401 KB
Dec 22, 2020 lab report
Source file type Laboratory Results · 2021-01-19 · 367 KB
Jan 24, 2020 lab report
Source file type Laboratory Results · 2020-02-28 · 450 KB
Dec 19, 2019 lab rpt
Source file type Laboratory Results · 2020-01-28 · 300 KB
Nov 19, 2019 lab report
Source file type Laboratory Results · 2019-12-05 · 346 KB
Mar 20, 2019
Source file type Laboratory Results · part 1/1 · 2019-04-05 · 377 KB
Feb 4, 2019 lab rpt
Source file type Laboratory Results · part 1/1 · 2019-03-05 · 405 KB
Dec 24, 2018 lab rpt
Source file type Laboratory Results · part 1/1 · 2019-01-21 · 353 KB
Dec 10, 2018 lab rpt
Source file type Laboratory Results · part 1/1 · 2019-01-07 · 368 KB
May 25, 2018 lab rpt
Source file type Laboratory Results · part 1/1 · 2018-07-11 · 338 KB
Jan 16, 2018 lab rpt
Source file type Laboratory Results · part 1/1 · 2018-02-06 · 339 KB
Nov 28, 2017 lab report
Source file type Laboratory Results · part 1/1 · 2018-01-12 · 342 KB
4/7/17 Stormwater Lab Results
Source file type Laboratory Results · part 1/1 · 2017-05-25 · 306 KB
2016 2nd half Stormwater Test
Source file type Laboratory Results · part 1/1 · 2017-02-08 · 348 KB
June Stormwater discharge test results
Source file type Laboratory Results · part 1/1 · 2016-07-12 · 329 KB
Stormwater Test Results
Source file type Laboratory Results · part 1/1 · 2015-12-22 · 3.1 MB
20240315-RG-SWPPP-Amend8
Source file type Supporting Documentation · part 1/1 · 2024-03-19 · 3.0 MB
SWPPP Amend 6
Source file type Supporting Documentation · 2021-07-31 · 1.8 MB
Level 2 Extension Request Letter
Source file type Cover/Explanation Letter · part 1/1 · 2018-12-21 · 64 KB
4/7/17 Visual Observation Log
Source file type Supporting Documentation · part 1/1 · 2017-05-25 · 2.7 MB
Level1ERA - Certification Page
Source file type Supporting Documentation · part 1/1 · 2016-12-30 · 282 KB
Pollutant Source Amendment
Source file type Other · part 1/1 · 2016-10-19 · 156 KB
October 16, 2012 RWB Inspection Memo
Source file type Memo · part 1/1 · 2016-10-05 · 663 KB
Royal GOld
Source file type Photograph · part 1/1 · 2016-09-27 · 2.5 MB
Royal GOld
Source file type Photograph · part 1/1 · 2016-09-27 · 3.1 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 3.4 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 2.4 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 2.2 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 2.6 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 2.0 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 1.7 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 2.8 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 1.7 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 3.2 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 3.2 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 3.1 MB
Royal Gold
Source file type Photograph · part 1/1 · 2016-09-27 · 2.2 MB
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.
Annual report documents on file
DerivedYears are YDOS-derived from attachment metadata. A gap means no annual-report document was identified for that year in the attachment index — it is not a finding that a report was not filed.
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