Public Water Partners

UNION, WA · Mason County

TWANOH TERRACE WATER CO Water System

Consumer Confidence Report status

TWANOH TERRACE WATER CO 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 TWANOH TERRACE WATER CO.

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)
WA5360190
System type
Community Water System
Population served
75
Service connections
30
Ownership
local government
Water source
groundwater (wells)

TWANOH TERRACE WATER CO is one of 3,227 community water systems in Washington in the 500 or fewer people size category, serving 75 people from groundwater.

As of August 1, 2026, its federal record holds 44 entries between 2005 and 2008, all of which EPA lists as closed. Nothing has been added since 2008.

All 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 volatile organic chemicals, inorganic chemicals, and synthetic organic chemicals.

Violation history

  • Initial Tap Sampling for Pb and Cu

    —

    Lead and Copper Rule

    January 1, 2008 – December 31, 2008

    Resolved

  • Monitoring, Regular

    —

    1,2-DIBROMO-3-CHLOROPROPANE

    July 1, 2007 – September 30, 2007

    Archived

  • Monitoring, Regular

    —

    ETHYLENE DIBROMIDE

    July 1, 2007 – September 30, 2007

    Archived

  • Monitoring, Regular

    —

    Diquat

    July 1, 2007 – September 30, 2007

    Resolved

  • Monitoring, Regular

    —

    Diquat

    January 1, 2007 – March 31, 2007

    Resolved

  • Monitoring, Regular

    —

    ETHYLENE DIBROMIDE

    January 1, 2007 – March 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Nitrate

    January 1, 2007 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,2-DIBROMO-3-CHLOROPROPANE

    January 1, 2007 – March 31, 2007

    Resolved

  • Monitoring, Routine Major (TCR)

    —

    Coliform (TCR)

    December 1, 2006 – December 31, 2006

    Archived

  • Monitoring, Regular

    —

    1,2-DIBROMO-3-CHLOROPROPANE

    October 1, 2006 – December 31, 2006

    Resolved

  • Monitoring, Regular

    —

    ETHYLENE DIBROMIDE

    October 1, 2006 – December 31, 2006

    Resolved

  • Monitoring, Regular

    —

    Diquat

    October 1, 2006 – December 31, 2006

    Resolved

  • Monitoring, Regular

    —

    Thallium, Total

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,2,4-Trichlorobenzene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    cis-1,2-Dichloroethylene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    DICHLOROMETHANE

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    o-Dichlorobenzene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    p-Dichlorobenzene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Vinyl chloride

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,1-Dichloroethylene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    trans-1,2-Dichloroethylene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloroethane

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,1,1-Trichloroethane

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Carbon tetrachloride

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,2-Dichloropropane

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Trichloroethylene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    1,1,2-Trichloroethane

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Tetrachloroethylene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    CHLOROBENZENE

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Benzene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Toluene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Ethylbenzene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Styrene

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Arsenic

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Barium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Cadmium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Chromium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    CYANIDE

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Fluoride

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Mercury

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Nickel

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Selenium

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Antimony, Total

    January 1, 2005 – December 31, 2007

    Resolved

  • Monitoring, Regular

    —

    Beryllium, Total

    January 1, 2005 – December 31, 2007

    Resolved

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 TWANOH TERRACE WATER CO required to publish a Consumer Confidence Report?

Yes. TWANOH TERRACE WATER CO 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 TWANOH TERRACE WATER CO’s next Consumer Confidence Report due?

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

Does TWANOH TERRACE WATER CO have any open drinking water violations on record?

As of August 1, 2026, EPA's federal records show no open violations for TWANOH TERRACE WATER CO.

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

TWANOH TERRACE WATER CO

Phone not on record

UNION, WA 98592-9649