Issaquah, WA · King County

OVERDALE WATER ASSOCIATION Water System

Inactive system

This water system is marked inactive in EPA’s federal records as of October 31, 2013. It is no longer an operating public water system under this PWSID, and no compliance deadlines — including the 2027 Consumer Confidence Report rule — apply to it.

If you are a resident looking for your current water provider, see water systems in King County, WA.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 2026. This is a record-keeping and public-information tool — it does not replace Washington’s official records. Always confirm current status with Washington before making decisions based on this information.

System facts

System ID (PWSID): WA5365000
System type: Community Water System
Population served: 476
Service connections: 138
Ownership: privately owned
Water source: groundwater (wells)

OVERDALE WATER ASSOCIATION is one of 3,227 community water systems in Washington in the 500 or fewer people size category, formerly serving 476 people from groundwater.

EPA's federal records list this system as inactive in 2013; the record below is historical.

As of August 1, 2026, its federal record holds 46 entries between 1979 and 2008, all of which EPA lists as closed. Nothing has been added since 2008.

Of the 46, 44 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves synthetic organic chemicals, volatile organic chemicals, and the Total Coliform Rules.

Violation history

Monitoring, Regular
—
LASSO
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
1,2,4-Trichlorobenzene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
cis-1,2-Dichloroethylene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
o-Dichlorobenzene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Vinyl chloride
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
1,2-Dichloroethane
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
1,1,1-Trichloroethane
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Carbon tetrachloride
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
1,2-Dichloropropane
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Trichloroethylene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Tetrachloroethylene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
CHLOROBENZENE
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Benzene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Toluene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Ethylbenzene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Styrene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Dalapon
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Picloram
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Dinoseb
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
2,4,5-TP
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Pentachlorophenol
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Endrin
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
BHC-GAMMA
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Methoxychlor
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Toxaphene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Simazine
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Hexachlorocyclopentadiene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Atrazine
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Heptachlor epoxide
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
HEXACHLOROBENZENE
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Pentachlorophenol
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Chlordane
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Heptachlor
January 1, 2008 – December 31, 2010
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2000 – August 31, 2000
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
June 1, 1999 – June 30, 1999
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 1994 – September 30, 1994
Archived
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 1991 – November 30, 1991
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1979 – October 31, 1979
Archived

Archived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2008 – December 31, 2010	Monitoring, Regular	LASSO	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,2,4-Trichlorobenzene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	cis-1,2-Dichloroethylene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	DICHLOROMETHANE	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	o-Dichlorobenzene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	p-Dichlorobenzene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Vinyl chloride	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,1-Dichloroethylene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,2-Dichloroethane	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,1,1-Trichloroethane	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Carbon tetrachloride	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,2-Dichloropropane	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Trichloroethylene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	1,1,2-Trichloroethane	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Tetrachloroethylene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	CHLOROBENZENE	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Benzene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Toluene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Ethylbenzene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Styrene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Dalapon	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Picloram	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Dinoseb	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	2,4,5-TP	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Pentachlorophenol	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Endrin	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	BHC-GAMMA	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Methoxychlor	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Toxaphene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Simazine	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Hexachlorocyclopentadiene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Atrazine	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Heptachlor epoxide	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	HEXACHLOROBENZENE	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Benzo(a)pyrene	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Pentachlorophenol	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Chlordane	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Heptachlor	—	Archived
August 1, 2000 – August 31, 2000	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
June 1, 1999 – June 30, 1999	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
September 1, 1994 – September 30, 1994	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
November 1, 1991 – November 30, 1991	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Archived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

September 30, 1991State Site Visit for enforcement purposes8 linked violations

Last known contact on file (system is inactive)

OVERDALE WATER ASSOCIATION

Phone not on record

Issaquah, WA 98027