Clean Water Act discharge permit · NPDES CA0038831
DEVIL'S SLIDE TUNNEL PROJECT, San Mateo County, CA: NPDES CA0038831 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MajorDischarger class
- 8Pollutants under a numeric limit
- 2Pollutants with an effluent exceedance
DEVIL'S SLIDE TUNNEL PROJECT, held by CA DEPT OF TRANSPORTATION, holds NPDES permit CA0038831, which discharges to Pacific Ocean. EPA’s file records it issued July 12, 2006 and expiring September 30, 2011. The status and dates are as EPA’s permit file stood when Velarion loaded it (October 14, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | DEVIL'S SLIDE TUNNEL PROJECT |
|---|---|
| Permittee as filed | CA DEPT OF TRANSPORTATION |
| NPDES ID | CA0038831 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Major discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | July 12, 2006 |
| Expiration date | September 30, 2011 |
| Address | San Mateo County, CA |
| Receiving water | PACIFIC OCEAN |
| Subwatershed | Denniston Creek-Frontal Pacific Ocean (HUC 180500060205) |
| SIC | 1622 – Bridge, Tunnel, & Elevated Highway |
Cited to the EPA ICIS-NPDES permit file (ECHO download) and EPA’s NAICS/SIC and component files, the same download.
Effluent limits and exceedances
- 8Pollutants on file
- 8Under a numeric limit
- 8With a violation of any kind
- 2With an effluent exceedance
An effluent exceedance is a discharge monitoring report value over the permit’s numeric limit (EPA’s violation code E90). A violation of any kind also counts a report not filed. Each row is EPA’s own count for that pollutant.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Solids, settleable | 6 | 59 | 11 | December 31, 2008 | 540% over the limit |
| pH | 4 | 57 | 1 | May 31, 2008 | |
| Turbidity | 6 | 84 | 0 | ||
| Solids, total suspended | 5 | 58 | 0 | ||
| Flow, in conduit or thru treatment plant | 4 | 56 | 0 | ||
| Oil and grease | 6 | 54 | 0 | ||
| Solids, suspended percent removal | 2 | 17 | 0 | ||
| Toxic Units Static Renewal 7-Day Chronic Atherinops affinis | 2 | 9 | 0 |
Cited to the EPA ICIS-NPDES limits and effluent violations files (ECHO download); up to 60 rows shown, most exceedances first.
Inspections, violations and enforcement
- 0Single-event violations
EPA’s single-event violation file, as loaded, holds no violation for NPDES CA0038831.
Velarion’s copy of EPA’s ICIS-NPDES files does not include the inspections, formal enforcement actions and informal enforcement actions files, so this page shows none of them. EPA’s free Detailed Facility Report on ECHO lists this permit’s inspections, enforcement actions and penalties.
Cited to the EPA ICIS-NPDES violation, inspection and enforcement files (ECHO download); up to 50 rows of each shown, newest first.
Watch this permit
One permit holder, $99/month. Watch the register for one permit holder and the places and receiving waters tied to its permits. Choose “One permit holder” and enter this permit’s NPDES ID, CA0038831.
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- One watershed — $2,990/year
- One state — $4,990/year
- The whole register — $18,000/year
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EPA publishes a free Detailed Facility Report for every permit on ECHO: its compliance status quarter by quarter, its inspections, and its enforcement actions and penalties. EPA also sends free notices of new inspections and enforcement actions through ECHO Notify; enter NPDES ID CA0038831 there.
Nearby on the register
Figures from EPA’s ICIS-NPDES download, loaded October 14, 2026.