Lake Oswego water and sewer rates
Who supplies water to Lake Oswego houses, what it costs, and how the sewer charge works.
City of Lake Oswego
City of Lake Oswego, monthly, single family residential from 7/1/26: $31.79 fixed charge plus $3.34 per ccf for 0 – 8 ccf, $4.80 per ccf for 9 – 16 ccf and $9.00 per ccf over 17 ccf
| Use a month | Price per unit (CCF, 748 gallons) |
|---|---|
| Fixed charge | $31.79 a month |
| 0 to 8 units | $3.34 |
| 8 to 16 units | $4.80 |
| 16 to more | $9.00 |
- Source
- Clackamas River watershed; water is withdrawn from the Clackamas River in Gladstone
- Violations
- The 2026 water quality report says there were no violations
- PFAS
- No PFAS detected in the drinking water supply, per the 2026 report
- Lead
- Lead 90th percentile 0.00 ppb in 2023; 0 homes exceeded the 15 ppb action level
Sewer
City of Lake Oswego sewer from 7/1/26, for customers within the City, served by the City, and outside Clean Water Services: $74.75 a month for the first dwelling unit plus $2.76 per ccf of average winter water usage (January, February and March invoices).
Other charges on the utility bill
- Stormwater management (single-family home or duplex): $24.51 a month
- Single-family street maintenance fee: $17.33 a month
Ways to pay less
- Free lead testing for water customers. The City offers free lead testing to its water customers. How: Request sample bottles and instructions from the City (see the 2026 water quality report).
Sources
Checked October 22, 2026. Every number here comes from the public sources listed, matched by our checker.
Rates change every year; this page shows when it was last checked. Nothing here is legal, tax or insurance advice.