NPS-MOUNT RUSHMORE NATIONAL MEMORIAL

South Dakota — Non-Transient Non-Community — PWSID: SD4680046

System Information

PWSID	SD4680046
System Name	NPS-MOUNT RUSHMORE NATIONAL MEMORIAL
System Type	Non-Transient Non-Community
Water Source	Ground Water
Activity Status	Active
Owner Type	Federal
EPA Region	08
Serves School	No
Wholesaler	No
First Reported	Jan 28, 1982
Last Reported	Dec 9, 2025

Location & Contact

State	South Dakota
City	KEYSTONE
ZIP Code	57751
Address	13000 HWY 244 BLDG 31 STE 1
Organization	NPS-MOUNT RUSHMORE NATIONAL MEMORIAL
Phone	6055743119

Population & Service

Population Served	4,100
Service Connections	19

Drinking Water Violations (48)

This water system has 48 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
Feb 1, 2022	Feb 28, 2022	Revised Total Coliform Rule	MON	No	No	—	—	—	Resolved	Feb 28, 2022	Revised Total Coliform Rule
Feb 1, 2022	Feb 28, 2022	Revised Total Coliform Rule	MON	No	No	—	—	—	Resolved	Feb 28, 2022	Revised Total Coliform Rule
Feb 1, 2022	Feb 28, 2022	Revised Total Coliform Rule	MON	No	No	—	—	—	Resolved	Feb 28, 2022	Revised Total Coliform Rule
Oct 1, 2011	Dec 31, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2011	Arsenic Rule
Oct 1, 2011	Dec 31, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2011	Arsenic Rule
Oct 1, 2011	Dec 31, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2011	Arsenic Rule
Jul 1, 2011	Sep 30, 2011	Arsenic	MCL	Yes	No	14 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2011	Arsenic Rule
Jul 1, 2011	Sep 30, 2011	Arsenic	MCL	Yes	No	14 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2011	Arsenic Rule
Jul 1, 2011	Sep 30, 2011	Arsenic	MCL	Yes	No	14 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2011	Arsenic Rule
Apr 1, 2011	Jun 30, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Jun 30, 2011	Arsenic Rule
Apr 1, 2011	Jun 30, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Jun 30, 2011	Arsenic Rule
Jan 1, 2011	Mar 31, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2011	Arsenic Rule
Jan 1, 2011	Mar 31, 2011	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2011	Arsenic Rule
Oct 1, 2010	Dec 31, 2010	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2010	Arsenic Rule
Oct 1, 2010	Dec 31, 2010	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2010	Arsenic Rule
Jul 1, 2010	Sep 30, 2010	Arsenic	MCL	Yes	No	.014 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2010	Arsenic Rule
Apr 1, 2010	Jun 30, 2010	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Jun 30, 2010	Arsenic Rule
Apr 1, 2010	Jun 30, 2010	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Jun 30, 2010	Arsenic Rule
Apr 1, 2010	Jun 30, 2010	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Jun 30, 2010	Arsenic Rule
Feb 1, 2010	Feb 28, 2010	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Feb 28, 2010	Total Coliform Rule
Jan 1, 2010	Mar 31, 2010	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2010	Arsenic Rule
Jan 1, 2010	Mar 31, 2010	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2010	Arsenic Rule
Jan 1, 2010	Mar 31, 2010	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2010	Arsenic Rule
Oct 1, 2009	Dec 31, 2009	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2009	Arsenic Rule
Oct 1, 2009	Dec 31, 2009	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2009	Arsenic Rule
Oct 1, 2009	Dec 31, 2009	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Dec 31, 2009	Arsenic Rule
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.012 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2009	Arsenic Rule
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.012 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2009	Arsenic Rule
Jul 1, 2009	Sep 30, 2009	Arsenic	MCL	Yes	No	.012 MG/L	0.010 mg/L	—	Resolved	Sep 30, 2009	Arsenic Rule
Apr 1, 2009	Jun 30, 2009	Arsenic	MCL	Yes	No	.013 MG/L	0.010 mg/L	—	Resolved	Jun 30, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.012 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2009	Arsenic Rule
Jan 1, 2009	Mar 31, 2009	Arsenic	MCL	Yes	No	.012 MG/L	0.010 mg/L	—	Resolved	Mar 31, 2009	Arsenic Rule
Oct 1, 2008	Dec 31, 2008	Arsenic	MCL	Yes	No	.012	0.010 mg/L	—	Resolved	Dec 31, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.013	0.010 mg/L	—	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.013	0.010 mg/L	—	Resolved	Sep 30, 2008	Arsenic Rule
Jul 1, 2008	Sep 30, 2008	Arsenic	MCL	Yes	No	.013	0.010 mg/L	—	Resolved	Sep 30, 2008	Arsenic Rule
Apr 1, 2008	Jun 30, 2008	Arsenic	MCL	Yes	No	.014	0.010 mg/L	—	Resolved	Jun 30, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Mar 31, 2008	Arsenic Rule
Jan 1, 2008	Mar 31, 2008	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Mar 31, 2008	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Oct 1, 2007	Dec 31, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Dec 31, 2007	Arsenic Rule
Jul 1, 2007	Sep 30, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Sep 30, 2007	Arsenic Rule
Apr 1, 2007	Jun 30, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Jun 30, 2007	Arsenic Rule
Apr 1, 2007	Jun 30, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Jun 30, 2007	Arsenic Rule
Apr 1, 2007	Jun 30, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Jun 30, 2007	Arsenic Rule
Jan 1, 2007	Mar 31, 2007	Arsenic	MCL	Yes	No	.015	0.010 mg/L	—	Resolved	Mar 31, 2007	Arsenic Rule
Oct 1, 2006	Dec 31, 2006	Arsenic	MCL	Yes	No	.016	0.010 mg/L	—	Resolved	Dec 31, 2006	Arsenic Rule

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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