TWISP TOWN OF

Washington — Community Water System — PWSID: WA5390050

System Information

PWSID	WA5390050
System Name	TWISP TOWN OF
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Local
EPA Region	10
Serves School	No
Wholesaler	No
First Reported	Feb 7, 1981
Last Reported	Dec 11, 2025

Location & Contact

State	Washington
City	Twisp
ZIP Code	98856
Address	PO Box 278
Organization	TWISP TOWN OF
Phone	—

Population & Service

Population Served	1,044
Service Connections	670

Drinking Water Violations (137)

This water system has 137 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, 2022	Dec 31, 2022	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2022	Nitrate Rule
Jan 1, 2022	Dec 31, 2022	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2022	Nitrate Rule
May 1, 2020	May 31, 2020	Revised Total Coliform Rule	MON	No	No	—	—	—	Resolved	May 31, 2020	Revised Total Coliform Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Jan 1, 2007	Dec 31, 2007	Nitrate	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 2007	Nitrate Rule
Oct 1, 2005	Oct 31, 2005	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Archived	Oct 31, 2005	Total Coliform Rule
Jan 1, 2005	Dec 31, 2007	Methoxychlor	MR	No	Yes	—	0.04 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor epoxide	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor epoxide	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor epoxide	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Di(2-ethylhexyl) adipate	MR	No	Yes	—	0.4 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Toxaphene	MR	No	Yes	—	0.003 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Toxaphene	MR	No	Yes	—	0.003 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Toxaphene	MR	No	Yes	—	0.003 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Toxaphene	MR	No	Yes	—	0.003 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Toxaphene	MR	No	Yes	—	0.003 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Methoxychlor	MR	No	Yes	—	0.04 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Methoxychlor	MR	No	Yes	—	0.04 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor	MR	No	Yes	—	0.0004 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	LASSO	MR	No	Yes	—	—	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Benzo(a)pyrene	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Benzo(a)pyrene	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Benzo(a)pyrene	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor	MR	No	Yes	—	0.0004 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor	MR	No	Yes	—	0.0004 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Methoxychlor	MR	No	Yes	—	0.04 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Methoxychlor	MR	No	Yes	—	0.04 mg/L	—	Resolved	Dec 31, 2007	Synthetic Organic Chemicals
Jan 1, 2005	Dec 31, 2007	Heptachlor epoxide	MR	No	Yes	—	0.0002 mg/L	—	Resolved	Dec 31, 2007	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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