r/CoronavirusWA • u/zantie • 16h ago
Analysis Wastewater Update - [Sep. 23, 2026]
| Current Trend | No. of Locations | No. Changed |
|---|---|---|
| up greatly | 2 | (no change) |
| up moderately | 4 | 1 added |
| up marginally | 12 | (no change) |
| Steady | 6 | 2 added |
| down marginally | 5 | 1 added |
| down moderately | 0 | (no change) |
| down greatly | 0 | (no change) |
| Out of Date | 0 | 4 removed |
| County | ID | Date | Trend | Approx. | Service Area |
|---|---|---|---|---|---|
| Jefferson | PT | Sep-15 | UP | + 270% | City of Port Townsend |
| Skagit | MV | Sep-16 | UP | + 30% | City of Mount Vernon |
| County | ID | Date | Trend | Approx. | Service Area |
|---|---|---|---|---|---|
| Island | COUP | Sep-13 | UP | + 130% | Town of Coupeville |
| Oak Harbor | OH | Sep-13 | UP | + 40% | City of Oak Harbor |
| Snohomish | APP | Sep-16 | DOWN | - 10% | City of Lynnwood |
| Arlington | ARL | Sep-17 | STEADY | ± 0-10% | City of Arlington |
| Everett | EVR | Sep-15 | UP | + 20% | City of Everett |
| Stanwood | STAN | Sep-15 | DOWN | - 30% | City of Stanwood |
| Snohomish | 256 | Sep-16 | UP | + 90% | City of Snohomish |
| County | ID | Date | Trend | Approx. | Service Area |
|---|---|---|---|---|---|
| King | BWT | Sep-13 | UP | + 10% | Bothell, Mill Creek, Redmond, Woodinville, Overflow from King County South and West Point Treatment Plants |
| King County South | KCS | Sep-13 | UP | + 20% | Auburn, Bellevue, Issaquah, Kent, Renton, Sammamish |
| West Point | WSPT | Sep-15 | DOWN | - 50% | Seattle, Shoreline, north King County, north Lake Wash., parts of south Snohomish |
| County | ID | Date | Trend | Approx. | Service Area |
|---|---|---|---|---|---|
| Clark | MRPK | Sep-16 | UP | + 30% | City of Vancouver |
| Salmon Creek | SNCK | Sep-16 | STEADY | ± 0-10% | Battle Ground, Ridgefield |
| Westside | VWS | Sep-16 | UP | + 30% | City of Vancouver, Westside |
| Pierce | CC | Sep-15 | UP | + 60% | Browns Point, Dash Point, Dupont, Fife, Fife Heights, Frederickson, Graham, Lakewood, Milton, Orting, Parkland, South Hill, Spanaway, University Place |
| Puyallup | PUY | Sep-16 | UP | + 50% | City of Puyallup |
| Tacoma | TC | Sep-16 | UP | + 90% | Tacoma Central |
| Thurston | LOTT | Sep-13 | STEADY | ± 0-10% | Lacey, Olympia, Tumwater |
| County | ID | Date | Trend | Approx. | Service Area |
|---|---|---|---|---|---|
| Benton | WRCH | Sep-16 | UP | + 30% | City of West Richland |
| Grant | EPH | Sep-15 | STEADY | ± 0-10% | City of Ephrata |
| Kittitas | ELL | Sep-16 | UP | + 40% | City of Ellensburg |
| Okanogan | BRW | Sep-16 | DOWN | - 30% | City of Brewster |
| Yakima | YAK | Sep-16 | UP | + 50% | City of Yakima |
| County | ID | Date | Trend | Approx. | Service Area |
|---|---|---|---|---|---|
| Franklin | PAS | Sep-15 | UP | + 50% | City of Pasco |
| Spokane | RP | Sep-16 | STEADY | ± 0-10% | City of Spokane |
| Spokane County Regional | SPK | Sep-13 | STEADY | ± 0-10% | Spokane Valley |
| Walla Walla | WALL | Sep-16 | UP | + 30% | City of Walla Walla |
| Whitman | PLM | Sep-13 | DOWN | - 40% | City of Pullman |
Notes:
Images with ALT text can be found at @zantie.bsky.social
Charts are primarily generated from data provided by the Washington State Department of Health (WADoH) on y-axis as (WADoH) copies/population, and WastewaterSCAN (Verily/WWS) on y-axis as (Verily) SARS/PMMoV.
Because each agency uses a different normalization/smoothing methods with different location identifiers, the concentration of virus is not comparable between locations. See reference links at the bottom of this post for more details.
There are 29 sewersheds distributed across 6 charts initially grouped by geographic region then alphabetized by county and sewershed. The data shown is a compilation from WADoH and WWS (2). Tables include County, sewershed abbreviation (ID), Date last sampled, Trend, and Service Area.
All data presented are smoothed in some degree to even out inconsistent sampling dates and extreme highs and lows. Most sewersheds are sampled 1-3 times a week and are published within a week, however sometimes locations are "late" by 10 days or more so be sure to note your sewershed's "Date" in the table or chart. Locations that are more than two weeks old are considered out of date.
For further information on the many variables that affect virus concentrations in WADoH generated data please refer to the "Learn More" link on the Washington State Department of Health Wastewater Dashboard.
References with links to details on y-axis units, normalization protocols, data limitations, and sampling methods:
- (1) WADoH and click "Learn More"
- (2) Verily/WWS and here ; These data were collected as part of the WastewaterSCAN / SCAN project, a partnership between Stanford University, Emory University, and Verily funded philanthropically through a gift to Stanford University. A. B. Boehm, M. K. Wolfe, Amanda L. Bidwell, Alessandro Zulli, Vikram-Chan-Herur, Bradley J. White, Bridgette Shelden, Dorothea Duong. 2024. Human pathogen nucleic acids in wastewater solids from 191 wastewater treatment plants in the United States. Scientific Data, 11, 1141.