# MAMMOTH,SUTRO,KEYSTONE ET AL, REDDING CA: EPA ECHO compliance status: Significant Violation

**Remediation Urgency Score:** 70/100

| Field | Value |
|---|---|
| Facility | MAMMOTH,SUTRO,KEYSTONE ET AL |
| EPA Registry ID | 110064635514 |
| Address | LITTLE BACKBONE & W SQUAW CRK, REDDING, CA, 96002 |
| County | SHASTA |
| SIC | 1021: Copper Ores |
| Overall compliance status | Significant Violation |
| Significant noncomplier | Yes |
| Quarters in noncompliance (last 12) | 12 |
| Clean Water Act | Compliance/Permit Schedule - Violations |
| Formal enforcement actions (5 years) | 0 |
| Total penalties | $0 |
| Inspections (5 years) | 3 |
| Last inspection | 2024-11-04 |
| Watershed | Sacramento Headwaters |

## Why this score
- Flagged as a significant noncomplier, the highest EPA priority tier.
- 12 of the last 12 quarters in noncompliance.
- Current violation under CWA.

Source: U.S. EPA ECHO (Enforcement and Compliance History Online) (https://echo.epa.gov/detailed-facility-report?fid=110064635514). Last refreshed: 2026-11-03T18:05:36.266Z.
Compliance data comes from EPA ECHO and may lag state records; a violation flag is not a finding of wrongdoing. Informational only; not legal or engineering advice.