Clean Water Act discharge permit · NPDES CA0030236
CUPERTINO QUARRY, Cupertino, CA: NPDES CA0030236 discharge permit, effluent exceedances, inspections, penalties
- Administratively continuedPermit status
- MinorDischarger class
- 164Pollutants under a numeric limit
- 7Pollutants with an effluent exceedance
CUPERTINO QUARRY, held by Stevens Creek Quarry, Inc., holds NPDES permit CA0030236, which discharges to Rattlesnake Creek, Swiss Creek. EPA’s file records it issued May 12, 2021 and expiring June 30, 2026. The status and dates are as EPA’s permit file stood when Velarion loaded it (September 15, 2026); EPA’s free Detailed Facility Report on ECHO carries the permit’s current standing.
Identity
| Facility as filed | CUPERTINO QUARRY |
|---|---|
| Permittee as filed | Stevens Creek Quarry, Inc. |
| NPDES ID | CA0030236 |
| Permit status | Administratively continued (past its expiration date and still in force until reissued) |
| Permit type | Individual permit |
| Discharger class | Minor discharger |
| Facility type | Not a publicly owned treatment works |
| Issued | May 12, 2021 |
| Expiration date | June 30, 2026 |
| Address | Cupertino, CA 95014 |
| Receiving water | Rattlesnake Creek, Swiss Creek |
| Subwatershed | Stevens Creek (HUC 180500030403) |
Cited to the EPA ICIS-NPDES permit file (ECHO download).
Effluent limits and exceedances
- 164Pollutants on file
- 164Under a numeric limit
- 18With a violation of any kind
- 7With 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; the 60 with the most exceedances of 164 are shown.
| Pollutant or measure | Limits | Violations, any kind | Effluent exceedances | Latest exceedance | Largest exceedance, as filed |
|---|---|---|---|---|---|
| Chromium, hexavalent [as Cr] | 32 | 42 | 22 | December 31, 2025 | 614% over the limit |
| Copper, total recoverable | 40 | 33 | 13 | December 31, 2023 | 443% over the limit |
| Lead, total recoverable | 40 | 24 | 4 | December 31, 2023 | 98% over the limit |
| pH | 17 | 19 | 4 | January 31, 2023 | |
| Nickel, total recoverable | 40 | 23 | 3 | December 31, 2023 | 40% over the limit |
| % Survival Static Renewal 96Hr Acute Pimephales promelas | 15 | 19 | 2 | December 31, 2024 | 7% over the limit |
| Solids, settleable | 5 | 2 | 2 | June 30, 2026 | 250% over the limit |
| Selenium, total recoverable | 40 | 22 | 0 | ||
| Flow, total | 6 | 18 | 0 | ||
| %Surv Static Renewal 96Hr Oncorhynchus mykiss | 15 | 16 | 0 | ||
| Rainfall | 6 | 16 | 0 | ||
| Solids, total suspended | 11 | 15 | 0 | ||
| Turbidity | 5 | 15 | 0 | ||
| Chromium, trivalent [as Cr] | 28 | 14 | 0 | ||
| Zinc, total recoverable | 28 | 13 | 0 | ||
| Nitrogen, ammonia total [as N] | 5 | 1 | 0 | ||
| Chromium, hexavalent dissolved [as Cr] | 5 | 1 | 0 | ||
| Chromium, trivalent dissolved, as Cr | 5 | 1 | 0 | ||
| Cyanide, total [as CN] | 19 | 0 | 0 | ||
| Oil and grease | 11 | 0 | 0 | ||
| Temperature, water deg. centigrade | 5 | 0 | 0 | ||
| Asbestos | 5 | 0 | 0 | ||
| Arsenic, total recoverable | 5 | 0 | 0 | ||
| Thallium, total recoverable | 5 | 0 | 0 | ||
| Beryllium, total recoverable [as Be] | 5 | 0 | 0 | ||
| Copper, dissolved [as Cu] | 5 | 0 | 0 | ||
| Lead, dissolved [as Pb] | 5 | 0 | 0 | ||
| Nickel, dissolved [as Ni] | 5 | 0 | 0 | ||
| Silver total recoverable | 5 | 0 | 0 | ||
| Zinc, dissolved [as Zn] | 5 | 0 | 0 | ||
| Cadmium, total recoverable | 5 | 0 | 0 | ||
| Chromium, total recoverable | 5 | 0 | 0 | ||
| Selenium, dissolved [as Se] | 5 | 0 | 0 | ||
| Antimony, total recoverable | 5 | 0 | 0 | ||
| 2-Methyl-4,6-dinitrophenol | 5 | 0 | 0 | ||
| 1,2,3,4,6,7,8,9-Octachlorodibenzo-p-dioxin | 5 | 0 | 0 | ||
| 1,2,3,7,8-Pentachlorodibenzo-p-dioxin | 5 | 0 | 0 | ||
| 1,2,3,4,7,8-Hexachlorodibenzo-p-dioxin | 5 | 0 | 0 | ||
| 1,2,3,6,7,8-Hexachlorodibenzo-p-dioxin | 5 | 0 | 0 | ||
| 1,2,3,7,8,9-Hexachlorodibenzo-p-dioxin | 5 | 0 | 0 | ||
| 1,2,3,7,8-Pentachlorodibenzofuran | 5 | 0 | 0 | ||
| 2,3,4,7,8-Pentachlorodibenzofuran | 5 | 0 | 0 | ||
| 1,2,3,4,7,8-Hexachlorodibenzofuran | 5 | 0 | 0 | ||
| 1,2,3,6,7,8-Hexachlorodibenzofuran | 5 | 0 | 0 | ||
| 1,2,3,7,8,9-Hexachlorodibenzofuran | 5 | 0 | 0 | ||
| 2,3,4,6,7,8-Hexachlorodibenzofuran | 5 | 0 | 0 | ||
| 1,2,3,4,6,7,8-Heptachlorodibenzofuran | 5 | 0 | 0 | ||
| 1,2,3,4,7,8,9-Heptachlorodibenzofuran | 5 | 0 | 0 | ||
| 1,2,3,4,6,7,8-Heptachlorodibenzo-p-dioxin | 5 | 0 | 0 | ||
| Dichlorobromomethane | 5 | 0 | 0 | ||
| Carbon tetrachloride | 5 | 0 | 0 | ||
| 1,2-Dichloroethane | 5 | 0 | 0 | ||
| Bromoform | 5 | 0 | 0 | ||
| Dibromochloromethane | 5 | 0 | 0 | ||
| Chloroform | 5 | 0 | 0 | ||
| Toluene | 5 | 0 | 0 | ||
| Benzene | 5 | 0 | 0 | ||
| .delta.-BHC | 5 | 0 | 0 | ||
| Acenaphthylene | 5 | 0 | 0 | ||
| Acenaphthene | 5 | 0 | 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 CA0030236.
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.
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Figures from EPA’s ICIS-NPDES download, loaded September 15, 2026.