Public Water Partners

ISSAQUAH, WA · King County

ISSAQUAH WATER SYSTEM Water System

Consumer Confidence Report status

ISSAQUAH WATER SYSTEM 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 ISSAQUAH WATER SYSTEM.

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)
WA5336350
System type
Community Water System
Population served
43,584
Service connections
14,979
Ownership
local government
Water source
surface water (rivers, lakes, or reservoirs)

ISSAQUAH WATER SYSTEM is one of 111 community water systems in Washington in the 10,001 to 100,000 people size category, serving 43,584 people from surface water.

As of August 1, 2026, its federal record holds 171 entries between 1979 and 2015, all of which EPA lists as closed. Nothing has been added since 2015.

Of the 171, 166 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

  • Consumer Confidence Report Complete Failure to Report

    —

    Consumer Confidence Rule

    July 1, 2015 – September 15, 2015

    Resolved

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2005 – December 31, 2007

    Resolved

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    November 1, 2003 – November 30, 2003

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    LASSO

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    LASSO

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Vinyl chloride

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Carbon tetrachloride

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Trichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Benzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Toluene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Ethylbenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Styrene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    LASSO

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor epoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    HEXACHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Benzo(a)pyrene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Chlordane

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Vinyl chloride

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Carbon tetrachloride

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Trichloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Benzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Toluene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Ethylbenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Styrene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    January 1, 2002 – December 31, 2004

    Resolved

  • Monitoring, Regular

    —

    Dalapon

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Picloram

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Dinoseb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    2,4,5-TP

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Pentachlorophenol

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    OXAMYL

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfoxide

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb sulfone

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Carbofuran

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Aldicarb

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Endrin

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    BHC-GAMMA

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Methoxychlor

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Toxaphene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) adipate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Simazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Di(2-ethylhexyl) phthalate

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Hexachlorocyclopentadiene

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Atrazine

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    LASSO

    January 1, 2002 – December 31, 2004

    Archived

  • Monitoring, Regular

    —

    Heptachlor

    January 1, 2002 – December 31, 2004

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    December 1, 2000 – December 31, 2000

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    November 1, 2000 – November 30, 2000

    Archived

  • Monitoring, Repeat Major (TCR)

    —

    Coliform (TCR)

    July 1, 2000 – July 31, 2000

    Archived

  • Maximum Contaminant Level Violation, Monthly (TCR)

    Health-based

    Coliform (TCR)

    August 1, 1994 – August 31, 1994

    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)

Enforcement actions

Common questions

Is ISSAQUAH WATER SYSTEM required to publish a Consumer Confidence Report?

Yes. ISSAQUAH WATER SYSTEM 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 ISSAQUAH WATER SYSTEM’s next Consumer Confidence Report due?

ISSAQUAH WATER SYSTEM’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

Does ISSAQUAH WATER SYSTEM have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for ISSAQUAH WATER SYSTEM.

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

ISSAQUAH WATER SYSTEM

Phone not on record

ISSAQUAH, WA 98027-1307