Current Trend	No. of Locations	No. Changed
up greatly	0	3 removed
up moderately	0	3 removed
up marginally	1	6 removed
Steady	3	1 removed
down marginally	14	12 added
down moderately	5	2 added
down greatly	0	(no change)
Out of Date	7	1 removed

Olympic Peninsula & Northwest Wash.

County	ID	Date	Trend	Approx.	Service Area
Jefferson	PT & 2044	Mar-02	DOWN	- 40%	City of Port Townsend
Skagit	MV & 2055	Mar-03	DOWN	- 30%	City of Mount Vernon

North Puget Sound [1 of 2]

County	ID	Date	Trend	Approx.	Service Area
Island	COUP	Feb-23	n/a	--	Town of Coupeville
Island	OH & 2042	Mar-02	DOWN	- 60%	City of Oak Harbor
Snohomish	APP & 205	Mar-03	DOWN	- 50%	City of Lynnwood
Snohomish	ARL	Feb-24	n/a	--	City of Arlington
Snohomish	EVR & 2059	Mar-02	DOWN	- 20%	City of Everett
Snohomish	STAN & 206	Mar-02	STEADY	± 0-9%	City of Stanwood
Snohomish	256	Mar-06	DOWN	- 30%	City of Snohomish

North Puget Sound [2 of 2]

County	ID	Date	Trend	Approx.	Service Area
King	BWT & 205	Mar-02	DOWN	- 30%	Bothell, Mill Creek, Redmond, Woodinville, Overflow from King County South and West Point Treatment Plants
King	KCS & 2045	Mar-02	UP	+ 30%	Auburn, Bellevue, Issaquah, Kent, Renton, Sammamish
King	WSPT & 2046	Mar-01	DOWN	- 50%	Seattle, Shoreline, north King County, north Lake Wash., parts of south Snohomish

South Puget Sound & Southwest Wash.

County	ID	Date	Trend	Approx.	Service Area
Clark	MRPK & 2037	Mar-02	DOWN	- 40%	City of Vancouver
Clark	SNCK	Feb-24	n/a	--	Battle Ground, Ridgefield
Clark	VWS & 2039	Mar-02	DOWN	- 40%	City of Vancouver, Westside
Pierce	CC & 2052	Feb-27	DOWN	- 60%	Browns Point, Dash Point, Dupont, Fife, Fife Heights, Frederickson, Graham, Lakewood, Milton, Orting, Parkland, South Hill, Spanaway, University Place
Pierce	PU & 2053	Mar-02	DOWN	- 60%	City of Puyallup
Pierce	TC	Feb-23	n/a	--	Tacoma Central
Thurston	LOT & 2064	Mar-01	STEADY	± 0-9%	Lacey, Olympia, Tumwater

North & South Central Wash.

County	ID	Date	Trend	Approx.	Service Area
Benton	WRCH	Feb-19	n/a	--	City of West Richland
Chelan	WEN & 2035	Mar-02	DOWN	- 50%	City of Wenatchee
Grant	EPH	Feb-18	n/a	--	City of Ephrata
Kittitas	ELL & 2047	Mar-02	STEADY	± 0-9%	City of Ellensburg
Okanogan	BRW	Feb-23	n/a	--	City of Brewster
Yakima	YAK & 2068	Mar-02	DOWN	- 20%	City of Yakima

Northeast & Southeast Wash.

County	ID	Date	Trend	Approx.	Service Area
Franklin	PAS & 204	Feb-27	DOWN	- 40%	City of Pasco
Spokane	RP & 206	Mar-02	DOWN	- 40%	City of Spokane
Spokane	SPK & 206	Mar-02	DOWN	- 60%	Spokane Valley
Walla Walla	WALLA & 2065	Mar-02	DOWN	- 50%	City of Walla Walla
Whitman	PLM & 2067	Mar-02	DOWN	- 50%	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.

White diamond dots are from most recent CDC (Ref. (2) ) data scaled to supplement missing data when available.

Because each of these agencies use different normalization methods, different smoothing methods, and different averaging/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 30 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 (3). 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) CDC
• (3) 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.