Lake Oswego - Tigard Water Supply
Published drinking-water records and contacts for Lake Oswego - Tigard Water Supply. System OR4101542. Review sources and dates; not a real-time water assessment.
- System ID
- OR4101542
- State or territory
- OR
- Published population served
- 0
- System type (source code)
- CWS
Published records and dates
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
Published compliance history
4 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 |
|---|---|---|---|---|
| Surface Water Treatment Rule / Monitoring of Treatment (SWTR-Filter) | 2026-03-01 – 2026-03-31 | Resolved | No | 2026Q3 |
| Surface Water Treatment Rule / Monitoring of Treatment (SWTR-Filter) | 2026-03-01 – 2026-03-31 | Resolved | No | 2026Q3 |
| Interim and Long Term 1 Enhanced Surface Water Treatment Rule / Monitoring, Turbidity (Enhanced SWTR) | 2026-03-01 – 2026-03-31 | Resolved | No | 2026Q3 |
| Lead and Copper Rule / Initial, Follow-up, or Routine Source Water M/R | 2026-01-01 – — | 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)
Lake Oswego - Tigard Water Supply: 971-415-4415
An administrative filing contact may not be a customer-service line. Confirm current contact details with the provider.