Walnut Grove Elementary School
Published drinking-water records and contacts for Walnut Grove Elementary School. System CA3400268. Review sources and dates; not a real-time water assessment.
- System ID
- CA3400268
- State or territory
- CA
- Published population served
- 200
- System type (source code)
- NTNCWS
Published records and dates
- Lead and copper monitoring summaries: 6 — 2011-01-01 – 2025-12-31
- California DDW laboratory results: 29 — 2026-03-10 – 2026-06-09
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) | 0.000641 mg/L | 2023-01-01 – 2025-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2020-01-01 – 2022-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2019-01-01 – 2021-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2018-01-01 – 2020-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2014-01-01 – 2016-12-31 | 2026Q3 |
| Lead (PB90) | 0 mg/L | 2011-01-01 – 2013-12-31 | 2026Q3 |
| Substance | Published result | Sample date | Location / source |
|---|---|---|---|
| ARSENIC | 5.67 UG/L | 2026-06-09 | MAIN WELL / California DDW laboratory results |
| ARSENIC | 5.41 UG/L | 2026-04-14 | MAIN WELL / California DDW laboratory results |
| PERFLUOROUNDECANOIC ACID (PFUNA) | < 0.731000000 NG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| NMEFOSAA | < 0.788000000 NG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| COMBINED RADIUM (-226 & -228) | < 0.327000000 PCI/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| PERFLUORODECANOIC ACID (PFDA) | < 0.668000000 NG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| PERFLUOROBUTANE SULFONIC ACID (PFBS) | 1.93 NG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| RADIUM-228 | < 0.327000000 PCI/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| NITRATE | < 0.400000000 MG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| PERFLUORODODECANOIC ACID (PFDOA) | < 0.861000000 NG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| 11CL-PF3OUDS | < 0.513000000 NG/L | 2026-03-10 | MAIN WELL / California DDW laboratory results |
| GROSS ALPHA PARTICLE ACTIVITY | < 1.540000000 PCI/L | 2026-03-10 | MAIN WELL / 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
3 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 |
|---|---|---|---|---|
| Lead and Copper Rule Revisions / LSL Inventory | 2024-10-17 – — | Unaddressed | Yes | 2026Q3 |
| Lead and Copper Rule Revisions / LSL Reporting | 2024-10-17 – — | Unaddressed | No | 2026Q3 |
| Total Coliform Rule / Maximum Contaminant Level Violation, Monthly (TCR) | 1999-12-01 – 1999-12-31 | Archived | Yes | 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
- California DDW laboratory results — last successful check: 2026-10-18
Administrative contact (EPA filing)
Wootton, Elise: 707-374-1700
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.