Drinking Water Compliance OS

UNION, WA · Mason County

TWANOH TERRACE WATER CO Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 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)

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

Contact

TWANOH TERRACE WATER CO

Phone not on record

UNION, WA 98592-9649