Big Sandy Rancheria
Published drinking-water records and contacts for Big Sandy Rancheria. System 090600121. Review sources and dates; not a real-time water assessment.
- System ID
- 090600121
- State or territory
- CA
- Published population served
- 408
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 10 — 1997-07-01 – 2025-12-31
Missing records here do not mean the provider did not test. Published records are not a real-time assessment of your tap water.
Published testing results
Selected recent records are shown below. Different sampling locations and dates are not interchangeable. These excerpts are not a complete testing history.
“<” means below the stated reporting limit, not zero. A reported measurement alone is not a safety verdict. Read an example
Lead and copper: 90th-percentile summaries
These describe a monitoring period across sampled locations, not the result at your home. How to read the 90th percentile
| Substance | Published 90th percentile | Monitoring period | Source quarter |
|---|---|---|---|
| Lead (PB90) | < 0.005 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | < 0.005 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | = 0.0105 mg/L | 2017-01-01 – 2019-12-31 | 2026Q3 |
| Lead (PB90) | < 0.005 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | = 0.0059 mg/L | 2011-01-01 – 2013-12-31 | 2026Q3 |
| Lead (PB90) | < 0.005 mg/L | 2002-01-01 – 2004-12-31 | 2026Q3 |
| Lead (PB90) | < 0.005 mg/L | 2001-01-01 – 2001-12-31 | 2026Q3 |
| Lead (PB90) | < 0.005 mg/L | 2000-01-01 – 2000-12-31 | 2026Q3 |
Published compliance history
95 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
| Rule / record | Period | Recorded status | Health-based (EPA classification) | Source quarter |
|---|---|---|---|---|
| Ground Water Rule / Failure To Address Deficiency | 2025-12-31 – — | Unaddressed | Yes | 2026Q3 |
| Ground Water Rule / Failure To Address Deficiency | 2025-12-31 – — | Unaddressed | Yes | 2026Q3 |
| Ground Water Rule / Failure To Address Deficiency | 2025-12-31 – — | Unaddressed | Yes | 2026Q3 |
| Ground Water Rule / Failure To Address Deficiency | 2025-12-31 – — | Unaddressed | Yes | 2026Q3 |
| Ground Water Rule / Failure To Address Deficiency | 2025-12-31 – — | Unaddressed | Yes | 2026Q3 |
| Radionuclides and Revised Rad Rule / Maximum Contaminant Level Violation, Average | 2025-01-01 – 2025-03-31 | Resolved | Yes | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2025-01-01 – — | Unaddressed | No | 2026Q3 |
| Radionuclides and Revised Rad Rule / Maximum Contaminant Level Violation, Average | 2024-10-01 – 2024-12-31 | Resolved | Yes | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2024-10-01 – — | Unaddressed | No | 2026Q3 |
| Radionuclides and Revised Rad Rule / Maximum Contaminant Level Violation, Average | 2024-07-01 – 2024-09-30 | Resolved | Yes | 2026Q3 |
| Radionuclides and Revised Rad Rule / Maximum Contaminant Level Violation, Average | 2024-04-01 – 2024-06-30 | Resolved | Yes | 2026Q3 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2024-04-01 – 2024-06-30 | Resolved | No | 2026Q3 |
| Public Notice Rule and Revised PN Rule / Public Notification Violation for NPDWR Violation | 2024-04-01 – — | Unaddressed | No | 2026Q3 |
| Radionuclides and Revised Rad Rule / Monitoring, Regular | 2023-10-01 – 2023-12-31 | Resolved | No | 2026Q3 |
| Ground Water Rule / Monitoring, Source Water (GWR) | 2023-03-01 – — | Resolved | No | 2026Q3 |
| Revised Total Coliform Rule / Monitoring, Routine (RTCR) | 2023-02-01 – 2023-02-28 | Resolved | No | 2026Q3 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-01-01 – 2023-03-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Stage 2 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2023-01-01 – 2025-12-31 | Resolved | No | 2026Q3 |
| Stage 1 Disinfectants and Disinfection Byproducts Rule / Monitoring and Reporting (DBP) | 2022-04-01 – 2022-06-30 | Resolved | No | 2026Q3 |
Source dates and refresh checks
A refresh check is not a sample date. Publication periods, sample dates and checks are shown separately.
- EPA SDWIS lead/copper summaries and service areas — source period: — – —; last checked: 2026-10-17
- EPA SDWIS contacts and compliance records — source period: — – —; last checked: 2026-10-17
- EPA UCMR 5 sample results — source period: 2023-01-03 – 2026-06-17; last checked: 2026-10-17
Administrative contact (EPA filing)
Big Sandy Rancheria: 5593740066
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.