Del Oro Wc - Black Butte District
Published drinking-water records and contacts for Del Oro Wc - Black Butte District. System CA1100404. Review sources and dates; not a real-time water assessment.
- System ID
- CA1100404
- State or territory
- CA
- Published population served
- 277
- System type (source code)
- CWS
Published records and dates
- Lead and copper monitoring summaries: 17 — 1993-01-01 – 2026-12-31
- California DDW laboratory results: 4 — 2026-02-10 – 2026-05-12
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) | 0.00305 mg/L | 2024-01-01 – 2026-12-31 | 2026Q3 |
| Lead (PB90) | 0.00111 mg/L | 2021-01-01 – 2023-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2018-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0.00294 mg/L | 2015-01-01 – 2017-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2012-01-01 – 2014-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2009-01-01 – 2011-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2007-01-01 – 2009-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2003-01-01 – 2005-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| FOAMING AGENTS (SURFACTANTS) | < 0.100000000 MG/L | 2026-05-12 | WELL 01 / California DDW laboratory results |
| PERCHLORATE | < 1.000000000 UG/L | 2026-02-10 | WELL 01 / California DDW laboratory results |
| NITRITE | < 0.400000000 MG/L | 2026-02-10 | WELL 01 / California DDW laboratory results |
| NITRATE | 1.97 MG/L | 2026-02-10 | WELL 01 / California DDW laboratory results |
State sampling points can include untreated water. Publisher qualifiers and units are retained; consult the full source notes before interpreting a record.
Download state records with source notes (CSV)
Published compliance history
0 imported records. Status is as recorded in the source; historical records are not current advisories. Missing records do not establish that no violations occurred.
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
- California DDW laboratory results — last successful check: 2026-10-17
Administrative contact (EPA filing)
Fortino, Robert: 530-809-3970
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.