What's in LAKE OSWEGO MUNICIPAL WATER's water?
LAKE OSWEGO MUNICIPAL WATER has a health-based violation on record, but none in the last five years - an older issue, not necessarily a current one. 40,000 people get their water from it, across 13,000 connections.
How this compares nationally
37 total violations and 1 health-based ones put LAKE OSWEGO MUNICIPAL WATER at the 41th percentile nationally for violation burden, rank 7,559 of 12,903.
How LAKE OSWEGO MUNICIPAL WATER compares within OR
OR's 160 covered systems average 6.0 health-based violations each; LAKE OSWEGO MUNICIPAL WATER carries 1, not more than typical for the state. See the lead and copper guide for why lead counts differently.
Most recent violation on record
The last violation EPA has on record for LAKE OSWEGO MUNICIPAL WATER is from 2025-01-07 (health-based: 2000-01-01). Last reported to EPA: 06/26/2026.
What kind of problem, specifically
LAKE OSWEGO MUNICIPAL WATER's flagged contaminants and rule violations, grouped by what they actually mean for a filter choice rather than left as EPA's raw code list:
- Lead & copper - flagged from: Lead and Copper Rule
The most severe category on record is lead & copper, which points toward a lead-class filter if you want to address it directly.
What this data is and is not
Everything on this page is LAKE OSWEGO MUNICIPAL WATER's own reported record under the Safe Drinking Water Act - a regulatory filing, not a sample of your tap. Water quality can still change between the meter and the faucet - household plumbing sits outside what a record of 37 logged violations can see. The guide to what this data misses covers that gap.