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CASTLE ROCK MUNICIPAL WATER

Washington — Community Water System — PWSID: WA5311800

System Information

PWSIDWA5311800
System NameCASTLE ROCK MUNICIPAL WATER
System TypeCommunity Water System
Water SourceSurface Water
Activity StatusActive
Owner TypeLocal
EPA Region10
Serves SchoolNo
WholesalerYes
First ReportedFeb 7, 1981
Last ReportedDec 11, 2025

Location & Contact

StateWashington
CityCASTLE ROCK
ZIP Code98611
AddressPO BOX 370
OrganizationCASTLE ROCK MUNICIPAL WATER
Phone—

Population & Service

Population Served4,367
Service Connections1,202

Drinking Water Violations (124)

This water system has 124 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
Jan 1, 2023 Dec 31, 2023 Total Haloacetic Acids (HAA5) MR No Yes — 0.060 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023 Dec 31, 2023 TTHM MR No Yes — 0.080 mg/L — Resolved Dec 31, 2023 Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2008 Dec 31, 2010 o-Dichlorobenzene MR No Yes — 0.6 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 DICHLOROMETHANE MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 p-Dichlorobenzene MR No Yes — 0.075 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Tetrachloroethylene MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Toluene MR No Yes — 1 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Carbon tetrachloride MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,1,2-Trichloroethane MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,1-Dichloroethylene MR No Yes — 0.007 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Trichloroethylene MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,2-Dichloropropane MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Styrene MR No Yes — 0.1 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 CHLOROBENZENE MR No Yes — 0.1 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Vinyl chloride MR No Yes — 0.002 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Benzene MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 Ethylbenzene MR No Yes — 0.7 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2008 Dec 31, 2010 1,2-Dichloroethane MR No Yes — 0.005 mg/L — Archived Dec 31, 2010 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 trans-1,2-Dichloroethylene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 1,2,4-Trichlorobenzene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 1,1,1-Trichloroethane MR No Yes — 0.2 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Trichloroethylene MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 cis-1,2-Dichloroethylene MR No Yes — 0.07 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Carbon tetrachloride MR No Yes — 0.005 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Styrene MR No Yes — 0.1 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2007 Volatile Organic Chemicals
Jan 1, 2007 Dec 31, 2007 Ethylbenzene MR No Yes — 0.7 mg/L — Resolved Dec 31, 2007 Volatile 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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