Compliance record
Formal violations the EPA has on file for this supplier. A health-based violation means a contaminant limit or a required treatment was breached; the rest are monitoring or reporting failures — still violations, but not a measured health risk.
| Violation | Type | Status | Period |
|---|---|---|---|
| MR | Monitoring | Archived | 2026-03-01 → 2026-03-31 |
| MR | Monitoring | Archived | 2026-03-01 → 2026-03-31 |
| MR | Monitoring | Archived | 2026-03-01 → 2026-03-31 |
| MR | Monitoring | Unaddressed | 2026-01-01 |
Utility contact
Frequently asked questions about Lake Oswego - Tigard Water Supply
Is Lake Oswego - Tigard Water Supply tap water safe to drink?
EPA monitoring found no contaminants above the detection limit for Lake Oswego - Tigard Water Supply. See the utility's annual Consumer Confidence Report for the full official status.
How many people does Lake Oswego - Tigard Water Supply serve?
Lake Oswego - Tigard Water Supply reports serving 0 people in Oregon, per its EPA record.
Has Lake Oswego - Tigard Water Supply had any water quality violations?
The EPA has 4 violations on file for Lake Oswego - Tigard Water Supply, of which 0 are health-based (a contaminant limit or required treatment was breached) and 1 remain open. The rest are monitoring or reporting failures.
Where does this data come from?
Every figure is official EPA drinking-water monitoring — the Lead & Copper Rule, the UCMR-5 nationwide testing program, and the EPA Six-Year Review — not our own testing. Each number is labelled with its source and period.