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UNDERWOOD

Washington — Community Water System — PWSID: WA5390200

System Information

PWSIDWA5390200
System NameUNDERWOOD
System TypeCommunity Water System
Water SourceGround Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerNo
First ReportedFeb 7, 1981
Last ReportedDec 11, 2025

Location & Contact

StateWashington
CityCARSON
ZIP Code98610
AddressPO BOX 500
OrganizationUNDERWOOD
Phone—

Population & Service

Population Served1,000
Service Connections379

Drinking Water Violations (198)

This water system has 198 violations recorded in the EPA SDWIS database.

Begin Date End Date Contaminant Category Health-Based Major Measured Federal MCL State MCL Status Return to Compliance Rule
Apr 1, 2025 Apr 30, 2025 Revised Total Coliform Rule MON No Yes — — — Resolved Apr 30, 2025 Revised Total Coliform Rule
Sep 1, 2023 Sep 30, 2023 Revised Total Coliform Rule MON No Yes — — — Resolved Sep 30, 2023 Revised Total Coliform Rule
May 1, 2022 May 31, 2022 Revised Total Coliform Rule MON No Yes — — — Resolved May 31, 2022 Revised Total Coliform Rule
Jul 1, 2014 — Consumer Confidence Rule Other No No — — — Resolved Sep 30, 2014 Consumer Confidence Rule
Jul 1, 2013 — Consumer Confidence Rule Other No No — — — Resolved Sep 30, 2013 Consumer Confidence Rule
Jul 1, 2012 — Consumer Confidence Rule Other No No — — — Resolved Oct 22, 2012 Consumer Confidence Rule
Jan 1, 2011 Dec 31, 2013 Tetrachloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Benzene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 CHLOROBENZENE MR No Yes — 0.1 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Toluene MR No Yes — 1 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Vinyl chloride MR No Yes — 0.002 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Jan 1, 2011 Dec 31, 2013 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Resolved Dec 31, 2013 Volatile Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Chlordane MR No Yes — 0.002 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Atrazine MR No Yes — 0.003 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Heptachlor MR No Yes — 0.0004 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Toxaphene MR No Yes — 0.003 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Methoxychlor MR No Yes — 0.04 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 HEXACHLOROBENZENE MR No Yes — 0.001 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Benzo(a)pyrene MR No Yes — 0.0002 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Endrin MR No Yes — 0.002 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Simazine MR No Yes — 0.004 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Heptachlor epoxide MR No Yes — 0.0002 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Hexachlorocyclopentadiene MR No Yes — 0.05 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Di(2-ethylhexyl) adipate MR No Yes — 0.4 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 LASSO MR No Yes — — — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Pentachlorophenol MR No Yes — 0.001 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 BHC-GAMMA MR No Yes — 0.0002 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2008 Jun 30, 2008 Diquat MR No Yes — 0.02 mg/L — Archived Jun 30, 2008 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 LASSO MR No Yes — — — Resolved Jun 30, 2005 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Jun 30, 2005 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Jun 30, 2005 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Jun 30, 2005 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Jun 30, 2005 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 Di(2-ethylhexyl) phthalate MR No Yes — 0.006 mg/L — Resolved Jun 30, 2005 Synthetic Organic Chemicals
Apr 1, 2005 Jun 30, 2005 Chlordane MR No Yes — 0.002 mg/L — Resolved Jun 30, 2005 Synthetic Organic Chemicals

About This Water System

Public water system data comes from the EPA Safe Drinking Water Information System (SDWIS). Systems with violations must notify customers. Contact your water utility for the latest annual water quality report.

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