Industrial stormwater facility

Hilfiker Pipe Co

WDID 1 12I010621 · Notice of Intent · Eureka, Humboldt

SIC 3356 · Rolling, Drawing, and Extruding of Nonferrous Metals, Except Copper and Aluminum · Regional Board 1 - North Coast Region

Official record — State Water Resources Control Board, Industrial General Permit

SMARTS monitoring

No reported results for this WDID

Above NAL (derived)

No derived NAL evaluation available

TMDL requirements

Water Board-stated limits across 0 TMDLs

303(d) associations

Derived geographic association — not confirmed discharge

Hydrologic

Geographic context

Official facility coordinate plotted against the associated Final 2026 Integrated Report impaired-water geometry.

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Facility location (official coordinate)
Associated impaired-water geometry (Final 2026 Integrated Report)
YDOS-derived geographic context
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Geometry shown is limited to waterbodies geographically associated with this facility. Geographic association does not establish a discharge connection, receiving-water connectivity, or causation.

Official facility point: 40.77044, -124.19120
HUC12 subwatershed: Humboldt Bay
HUC12 code: 180101020605
Impaired-water associations (derived): 5

Intelligence summary

What is available for this facility across the connected datasets.

SMARTS monitoringNo reported results for this WDIDSMARTS source-reported Numeric Action Level (NAL) contextNo NAL comparison availableYDOS-derived TMDL requirementsNo TMDL requirements recorded in SMARTSSMARTS source-stated 303(d) context5 geographically associated impaired watersAssociation does not establish a discharge connection.YDOS-derived

Official

Facility record

Facility name: Hilfiker Pipe Co
WDID: 1 12I010621
Application type: Notice of Intent
City: Eureka
County: Humboldt
ZIP: 95503
Primary SIC code: 3356
SIC description: Rolling, Drawing, and Extruding of Nonferrous Metals, Except Copper and Aluminum
Date active: 1993-09-21
Regional Water Board: Regional Board 1 - North Coast Region

303(d) context

Associated impaired waters

Grouped by derived geographic association class.

Derived

Subwatershed + nearby

2 waterbodies

Eureka Plain HU, Humboldt Bay

Bay & Harbor · Integrated Report category 5 · TMDL required

Listed pollutants / stressors (3) Dioxin compounds (including 2,3,7,8-TCDD), Dioxin Toxic Equivalents, PCBs (Polychlorinated biphenyls)

Distance 0.43 km

Confidence high

Fact sheet ↗

Eureka Plain HU, Elk River Watershed, Lower Elk River and Martin Slough

River & Stream · Integrated Report category 5 · TMDL required

Listed pollutants / stressors (2) Indicator Bacteria, Sediment

Distance 0.48 km

Confidence high

Fact sheet ↗

Same impaired-water subwatershed

3 waterbodies

Eureka Plain HU, Freshwater Creek

River & Stream · Integrated Report category 5 · TMDL required

Listed pollutants / stressors (3) Aluminum, Sediment, Sedimentation/Siltation

Distance —

Confidence low

Fact sheet ↗

Eureka Plain HU, Jolly Giant Creek

River & Stream · Integrated Report category 5 · TMDL required

Listed pollutants / stressors (1) Indicator Bacteria

Distance —

Confidence low

Fact sheet ↗

Eureka Plain HU, Salmon Creek

River & Stream · Integrated Report category 5 · TMDL required

Listed pollutants / stressors (2) Aluminum, Manganese

Distance —

Confidence low

Fact sheet ↗

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.

TMDL requirements

Water Board-stated TMDL waste load allocations applied to this industrial permit in SMARTS.

Official record — SMARTS TMDL dataset, State Water Board

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

SMARTS monitoring

Self-reported industrial stormwater sampling results as submitted by the discharger to SMARTS.

Official record — SMARTS parameter data, State Water Board

Reported results: 68
Sample events: 10
Distinct parameters: 9
Reporting years: 2015 – 2016
First sample: 2015-11-24
Latest sample: 2017-04-12
Source regional dataset: Region 1 - North Coast
Source retrieved: Aug 21, 2026

Official SMARTS public reports ↗

Parameters reported

Reported results over time

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Most recent reported results

Latest 25 of 68

Sample date	Location	Parameter	Result	Units	Event
2017-04-12	Station 1	Iron	6.8	mg/L	Qualifying Storm Event
2017-04-12	Station 1	Oil and Grease	DNQ 1.3(non-detect / est.)	mg/L	Qualifying Storm Event
2017-04-12	Station 1	pH	8.5	SU	Qualifying Storm Event
2017-04-12	Station 1	Total Suspended Solids (TSS)	100	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Aluminum	4	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Copper	.011	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Iron	7.9	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Nitrate	DNQ .051(non-detect / est.)	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Nitrogen, Nitrite	ND —(non-detect / est.)	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Oil and Grease	DNQ 2.4(non-detect / est.)	mg/L	Qualifying Storm Event
2017-04-12	Station 2	pH	7.8	SU	Qualifying Storm Event
2017-04-12	Station 2	Total Suspended Solids (TSS)	94	mg/L	Qualifying Storm Event
2017-04-12	Station 2	Zinc	.56	mg/L	Qualifying Storm Event
2017-01-18	Station 1	Iron	2.7	mg/L	Qualifying Storm Event
2017-01-18	Station 1	Oil and Grease	DNQ 3.7(non-detect / est.)	mg/L	Qualifying Storm Event
2017-01-18	Station 1	pH	9.5	SU	Qualifying Storm Event
2017-01-18	Station 1	Total Suspended Solids (TSS)	35	mg/L	Qualifying Storm Event
2017-01-18	Station 2	Aluminum	2.3	mg/L	Qualifying Storm Event
2017-01-18	Station 2	Copper	.0069	mg/L	Qualifying Storm Event
2017-01-18	Station 2	Iron	3.7	mg/L	Qualifying Storm Event
2017-01-18	Station 2	Nitrate	1.1	mg/L	Qualifying Storm Event
2017-01-18	Station 2	Nitrogen, Nitrite	ND —(non-detect / est.)	mg/L	Qualifying Storm Event
2017-01-18	Station 2	Oil and Grease	DNQ 2.9(non-detect / est.)	mg/L	Qualifying Storm Event
2017-01-18	Station 2	pH	8.4	SU	Qualifying Storm Event
2017-01-18	Station 2	Total Suspended Solids (TSS)	42	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

Numeric Action Level comparison

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).

Derived

Reporting years evaluated: 2
Years with an NAL exceedance: 2
Most recent evaluated year: RY 2016
Ruleset: igp_nal_ruleset_v1 / igp_nal_v1

Parameter	NAL type	Calculated value	NAL	Result	Samples used	Method
Aluminum, Total aluminum_total	Annual	3.15 mg/L	0.75 mg/L	Above NALAnnual average of 2 eligible result(s) compared with the annual NAL.4.2× threshold	2 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)
Copper, Total copper_total	Annual	0.009 mg/L	0.033 mg/L	At or below NALAnnual average of 2 eligible result(s) compared with the annual NAL.0.27× threshold	2 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	5.275 mg/L	1 mg/L	Above NALAnnual average of 4 eligible result(s) compared with the annual NAL.5.28× threshold	4 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)
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.	4 eligible4 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	—1 sample above	6 – 9 pH units	Within NAL rangeOne eligible result in this reporting year was outside the instantaneous maximum NAL. The Order states the condition as two or more results in one reporting year.	4 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.	4 eligible	count of eligible effluent results outside the instantaneous maximum NAL within the July 1 - June 30 reporting year
Zinc, Total zinc_total	Annual	0.495 mg/L	0.26 mg/L	Above NALAnnual average of 2 eligible result(s) compared with the annual NAL.1.9× threshold	2 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)

YDOS-derived overlap

Pollutant overlap with impaired receiving waters

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.

Derived

AluminumMonitoringAbove NAL303(d) impairmentEureka Plain HU, Freshwater Creek

1 reporting year above the annual NAL, most recently RY 2016 · 1 303(d) listing · association: derived watershed association (low confidence)

AluminumMonitoringAbove NAL303(d) impairmentEureka Plain HU, Salmon Creek

1 reporting year above the annual NAL, most recently RY 2016 · 1 303(d) listing · association: derived watershed association (low 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

Documents on file

Attachment inventory recorded in the State Water Board SMARTS public attachment workflow for this permit.

Source inventory — SMARTS public attachments. Documents are operator-submitted.

Metadata indicators

Derived

Substantive documents on file: 74
SWPPP versions on file: 25
Most recent SWPPP attached: 2026-03-31
Most recent substantive document: 2026-07-08
Annual report years on file: 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025, 2026
Apparent year gaps in annual reports: None apparent
ERA-related documents: 4
Enforcement / inspection / laboratory documents: 0 / 1 / 7

Document 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.

74 substantive of 102 indexed attachments

Include administrative records (certificates of receipt, fee statements)

SWPPP

30 documents

SWPPP Amendment #7

Source file type SWPPP · 2026-03-31 · 342 KB

Site Map

Source file type Facility/Site Map · 2026-03-31 · 197 KB

SWPPP Amendment #7

Source file type SWPPP · 2026-03-31 · 342 KB

Site Map

Source file type Facility/Site Map · 2020-04-07 · 218 KB

SWPPP-Amendment 5

Source file type SWPPP · 2020-04-07 · 14.9 MB

SWPPP 2017 Figure 2

Source file type Facility/Site Map · part 1/1 · 2018-08-13 · 208 KB

Stormwater Pollution Prevention Plan Hilfiker

Source file type SWPPP · part 1/1 · 2018-08-13 · 11.8 MB

Amendment 3

Source file type SWPPP · part 1/1 · 2017-05-22 · 11.4 MB

Amendment 2

Source file type SWPPP · part 1/1 · 2016-09-30 · 634 KB

Site Map (March 2016)