Is SAMMAMISH PLATEAU WATER & SEWER required to publish a Consumer Confidence Report?

Yes. SAMMAMISH PLATEAU WATER & SEWER is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is SAMMAMISH PLATEAU WATER & SEWER’s next Consumer Confidence Report due?

SAMMAMISH PLATEAU WATER & SEWER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Sammamish, WA · King County

SAMMAMISH PLATEAU WATER & SEWER Water System

Consumer Confidence Report status

SAMMAMISH PLATEAU WATER & SEWER must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for SAMMAMISH PLATEAU WATER & SEWER.

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): WA5340900
System type: Community Water System
Population served: 79,362
Service connections: 24,792
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

SAMMAMISH PLATEAU WATER & SEWER is one of 111 community water systems in Washington in the 10,001 to 100,000 people size category, serving 79,362 people from surface water.

As of August 1, 2026, its federal record holds 46 entries between 1979 and 2009, all of which EPA lists as closed. Nothing has been added since 2009.

Of the 46, 45 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, inorganic chemicals, and the Total Coliform Rules.

Violation history

Monitoring, Regular
—
Nitrate
January 1, 2009 – December 31, 2009
Resolved
Monitoring, Regular
—
Nitrate
January 1, 2009 – December 31, 2009
Resolved
Monitoring, Regular
—
Diquat
April 1, 2008 – June 30, 2008
Archived
Monitoring, Regular
—
ETHYLENE DIBROMIDE
April 1, 2008 – June 30, 2008
Archived
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
April 1, 2008 – June 30, 2008
Archived
Monitoring, Regular
—
Heptachlor epoxide
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
—
LASSO
January 1, 2008 – December 31, 2010
Archived
Monitoring, Regular
—
Heptachlor
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
—
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
—
Diquat
October 1, 2007 – December 31, 2007
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
October 1, 2007 – December 31, 2007
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
October 1, 2007 – December 31, 2007
Resolved
Monitoring, Regular
—
ETHYLENE DIBROMIDE
July 1, 2007 – September 30, 2007
Resolved
Monitoring, Regular
—
1,2-DIBROMO-3-CHLOROPROPANE
July 1, 2007 – September 30, 2007
Resolved
Monitoring, Regular
—
Diquat
July 1, 2007 – September 30, 2007
Resolved
Monitoring, Regular
—
Fluoride
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Mercury
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Nickel
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Selenium
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Beryllium, Total
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Thallium, Total
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Antimony, Total
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Arsenic
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Barium
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Cadmium
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
Chromium
January 1, 2005 – December 31, 2007
Archived
Monitoring, Regular
—
CYANIDE
January 1, 2005 – December 31, 2007
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2000 – August 31, 2000
Archived
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 1979 – October 31, 1979
Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate	—	Resolved
January 1, 2009 – December 31, 2009	Monitoring, Regular	Nitrate	—	Resolved
April 1, 2008 – June 30, 2008	Monitoring, Regular	Diquat	—	Archived
April 1, 2008 – June 30, 2008	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Archived
April 1, 2008 – June 30, 2008	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Heptachlor epoxide	—	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	LASSO	—	Archived
January 1, 2008 – December 31, 2010	Monitoring, Regular	Heptachlor	—	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	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
October 1, 2007 – December 31, 2007	Monitoring, Regular	Diquat	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
July 1, 2007 – September 30, 2007	Monitoring, Regular	ETHYLENE DIBROMIDE	—	Resolved
July 1, 2007 – September 30, 2007	Monitoring, Regular	1,2-DIBROMO-3-CHLOROPROPANE	—	Resolved
July 1, 2007 – September 30, 2007	Monitoring, Regular	Diquat	—	Resolved
January 1, 2005 – December 31, 2007	Monitoring, Regular	Fluoride	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Mercury	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Nickel	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Selenium	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Beryllium, Total	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Thallium, Total	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Antimony, Total	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Arsenic	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Barium	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Cadmium	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	Chromium	—	Archived
January 1, 2005 – December 31, 2007	Monitoring, Regular	CYANIDE	—	Archived
August 1, 2000 – August 31, 2000	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Archived
October 1, 1979 – October 31, 1979	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Archived

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

February 24, 2010State Compliance achieved1 linked violation
February 24, 2010State Compliance achieved1 linked violation
January 1, 2008State Compliance achieved179 linked violations
January 1, 2008State Compliance achieved195 linked violations

Common questions

Is SAMMAMISH PLATEAU WATER & SEWER required to publish a Consumer Confidence Report?: Yes. SAMMAMISH PLATEAU WATER & SEWER is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is SAMMAMISH PLATEAU WATER & SEWER’s next Consumer Confidence Report due?: SAMMAMISH PLATEAU WATER & SEWER’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does SAMMAMISH PLATEAU WATER & SEWER have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for SAMMAMISH PLATEAU WATER & SEWER.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

SAMMAMISH PLATEAU WATER & SEWER

Phone not on record

Sammamish, WA 98075