GRASSLAND COLONY

South Dakota — Community Water System — PWSID: SD4602028

System Information

PWSID	SD4602028
System Name	GRASSLAND COLONY
System Type	Community Water System
Water Source	Surface Water Purchased
Activity Status	Inactive
Owner Type	Private
EPA Region	08
Serves School	No
Wholesaler	No
First Reported	Sep 19, 1990
Last Reported	Dec 9, 2025

Location & Contact

State	South Dakota
City	WESTPORT
ZIP Code	57481
Address	11865 370TH AVENUE
Organization	GRASSLAND COLONY
Phone	6054393603

Population & Service

Population Served	130
Service Connections	30

Drinking Water Violations (366)

This water system has 366 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
Jun 13, 2015	—		Other	No	No	—	—	—	Resolved	Apr 1, 2016	Ground Water Rule
Jun 13, 2015	—		Other	No	No	—	—	—	Resolved	Apr 1, 2016	Ground Water Rule
Feb 1, 2010	—	Stage 1 Disinfectants and Disinfection Byproducts Rule	TT	Yes	No	—	—	—	Resolved	Feb 16, 2010	Stage 1 Disinfectants and Disinfection Byproducts Rule
Feb 1, 2010	—	Stage 1 Disinfectants and Disinfection Byproducts Rule	TT	Yes	No	—	—	—	Resolved	Feb 16, 2010	Stage 1 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2003	Jul 31, 2003	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2003	Total Coliform Rule
Jul 1, 2003	Jul 31, 2003	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2003	Total Coliform Rule
Jul 1, 2003	Jul 31, 2003	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2003	Total Coliform Rule
Mar 1, 2000	Mar 31, 2000	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Resolved	Mar 31, 2000	Total Coliform Rule
Mar 1, 2000	Mar 31, 2000	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Resolved	Mar 31, 2000	Total Coliform Rule
Mar 1, 2000	Mar 31, 2000	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Resolved	Mar 31, 2000	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1999	Total Coliform Rule
Jul 1, 1999	Jul 31, 1999	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 1999	Total Coliform Rule
Aug 1, 1998	Aug 31, 1998	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Aug 31, 1998	Total Coliform Rule
Aug 1, 1998	Aug 31, 1998	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Aug 31, 1998	Total Coliform Rule
Feb 1, 1998	Feb 28, 1998	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Feb 28, 1998	Total Coliform Rule
Feb 1, 1998	Feb 28, 1998	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Feb 28, 1998	Total Coliform Rule
Sep 15, 1997	Oct 14, 1997	Lead and Copper Rule	Other	No	No	—	TT	—	Archived	Oct 14, 1997	Lead and Copper Rule
Jan 1, 1997	Jul 24, 1997	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 24, 1997	Lead and Copper Rule
Jan 1, 1997	Jul 24, 1997	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 24, 1997	Lead and Copper Rule
Jan 1, 1997	Jul 24, 1997	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 24, 1997	Lead and Copper Rule
Oct 14, 1996	Nov 13, 1996		Other	No	No	—	—	—	Archived	Nov 13, 1996	Miscellaneous Other Rules
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Oct 31, 1996	Total Coliform Rule
Oct 1, 1996	Oct 31, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Oct 31, 1996	Total Coliform Rule
Sep 1, 1996	Sep 30, 1996	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Sep 30, 1996	Total Coliform Rule
Sep 1, 1996	Sep 30, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Sep 30, 1996	Total Coliform Rule
Sep 1, 1996	Sep 30, 1996	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Sep 30, 1996	Total Coliform Rule
Sep 1, 1996	Sep 30, 1996	Coliform (TCR)	MR	No	No	—	5% of samples	—	Archived	Sep 30, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Aug 1, 1996	Aug 31, 1996	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Aug 31, 1996	Total Coliform Rule
Jul 1, 1996	Jul 24, 1997	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 24, 1997	Lead and Copper Rule
Jul 1, 1996	Jul 24, 1997	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Jul 24, 1997	Lead and Copper Rule
Jul 1, 1996	Jul 31, 1996	Coliform (TCR)	MR	No	Yes	—	5% of samples	—	Archived	Jul 31, 1996	Total Coliform Rule
Jan 1, 1996	Dec 31, 1996	trans-1,2-Dichloroethylene	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	CHLOROBENZENE	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	CHLOROBENZENE	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	Benzene	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	Carbon tetrachloride	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	Xylenes, Total	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	Benzene	MR	No	Yes	—	0.005 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	Xylenes, Total	MR	No	Yes	—	10 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	p-Dichlorobenzene	MR	No	Yes	—	0.075 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	trans-1,2-Dichloroethylene	MR	No	Yes	—	0.1 mg/L	—	Resolved	Dec 31, 1996	Volatile Organic Chemicals
Jan 1, 1996	Dec 31, 1996	p-Dichlorobenzene	MR	No	Yes	—	0.075 mg/L	—	Resolved	Dec 31, 1996	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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