| Date of Status Change | Record Sequence | Active or Inactive | Primary Source | PWS Type | Population | PWS Name | 
| Current Status 08/09/2022 | 8 | A | SWP | C | 40,000 | LAKE OSWEGO MUNICIPAL WATER | 
| 08/09/2022 | 7 | A | SWP | C | 36,453 | LAKE OSWEGO MUNICIPAL WATER | 
| 01/02/2020 | 6 | A | SW | C | 36,453 | LAKE OSWEGO MUNICIPAL WATER | 
| 07/30/2019 | 5 | A | SW | C | 36,093 | LAKE OSWEGO MUNICIPAL WATER | 
| 05/20/2009 | 4 | A | SW | C | 71,843 | LAKE OSWEGO MUNICIPAL WATER | 
| 09/25/2007 | 3 | A | SW | C | 35,750 | LAKE OSWEGO MUNICIPAL WATER | 
| 12/28/2004 | 2 | A | SW | C | 36,700 | LAKE OSWEGO MUNICIPAL WATER | 
| 10/18/2004 | 1 | A | SW | C | 33,145 | LAKE OSWEGO MUNICIPAL WATER | 
| Population Type | Avg Daily Population | Start Month | Start Day | End Month | End Day | Effective Begin Date | Effective End Date | 
| Residential | 40000 | 1 | 1 | 12 | 31 | 06/29/2022 | |
| Residential | 36453 | 1 | 1 | 12 | 31 | 06/26/2019 | 06/28/2022 | 
| Residential | 36093 | 1 | 1 | 12 | 31 | 09/25/2007 | 06/25/2019 | 
| Residential | 35750 | 1 | 1 | 12 | 31 | 09/15/2004 | 09/24/2007 | 
| Residential | 33145 | 1 | 1 | 12 | 31 | First Record | 09/14/2004 |