RYAN DAM WATER SYSTEM

Montana — Community Water System — PWSID: MT0000046

System Information

PWSID	MT0000046
System Name	RYAN DAM WATER SYSTEM
System Type	Community Water System
Water Source	Ground Water
Activity Status	Active
Owner Type	Private
EPA Region	08
Serves School	No
Wholesaler	No
First Reported	Feb 13, 1979
Last Reported	Jan 5, 2026

Location & Contact

State	Montana
City	HELENA
ZIP Code	59620-0901
Address	208 N MONTANA AVE STE 200
Organization	TOLLEFSON, JORDAN
Phone	406-443-8907

Population & Service

Population Served	230
Service Connections	14

Drinking Water Violations (189)

This water system has 189 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
May 24, 2023	—	Revised Total Coliform Rule	TT	Yes	No	—	—	—	Resolved	Jun 5, 2023	Revised Total Coliform Rule
May 24, 2023	—	Revised Total Coliform Rule	TT	Yes	No	—	—	—	Resolved	Jun 5, 2023	Revised Total Coliform Rule
May 24, 2023	—	Revised Total Coliform Rule	TT	Yes	No	—	—	—	Resolved	Jun 5, 2023	Revised Total Coliform Rule
Apr 20, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Apr 25, 2023	Ground Water Rule
Apr 20, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Apr 25, 2023	Ground Water Rule
Apr 20, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Apr 25, 2023	Ground Water Rule
Apr 20, 2023	—	E. COLI	MR	No	Yes	—	—	—	Resolved	Apr 25, 2023	Ground Water Rule
Jan 1, 2023	Dec 31, 2025	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Unaddressed	—	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023	Dec 31, 2025	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Unaddressed	—	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023	Dec 31, 2025	Total Haloacetic Acids (HAA5)	MR	No	Yes	—	0.060 mg/L	—	Unaddressed	—	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023	Dec 31, 2025	TTHM	MR	No	Yes	—	0.080 mg/L	—	Unaddressed	—	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023	Dec 31, 2025	TTHM	MR	No	Yes	—	0.080 mg/L	—	Unaddressed	—	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jan 1, 2023	Dec 31, 2025	TTHM	MR	No	Yes	—	0.080 mg/L	—	Unaddressed	—	Stage 2 Disinfectants and Disinfection Byproducts Rule
Jul 1, 2019	Jul 31, 2019	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2019	Ground Water Rule
Jul 1, 2019	Jul 31, 2019	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2019	Ground Water Rule
Jul 1, 2019	Jul 31, 2019	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2019	Ground Water Rule
Jul 1, 2019	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Jul 19, 2019	Consumer Confidence Rule
Jul 1, 2019	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Jul 19, 2019	Consumer Confidence Rule
Jul 1, 2019	Jul 31, 2019	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2019	Ground Water Rule
Jul 1, 2018	Jul 31, 2018	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2018	Ground Water Rule
Jul 1, 2018	Jul 31, 2018	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2018	Ground Water Rule
Jul 1, 2018	Jul 31, 2018	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2018	Ground Water Rule
Jul 1, 2018	Jul 31, 2018	Groundwater Rule	MR	No	Yes	—	—	—	Resolved	Jul 31, 2018	Ground Water Rule
Oct 1, 2012	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Oct 15, 2012	Lead and Copper Rule
Oct 1, 2012	—	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Oct 15, 2012	Lead and Copper Rule
Jan 1, 2011	Dec 31, 2013	Asbestos	MR	No	Yes	—	7 MFL	—	Resolved	Jul 24, 2013	Inorganic Chemicals
Jan 1, 2011	Dec 31, 2013	Asbestos	MR	No	Yes	—	7 MFL	—	Resolved	Jul 24, 2013	Inorganic Chemicals
Jan 1, 2011	Jun 30, 2011	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Feb 28, 2011	Lead and Copper Rule
Jan 1, 2011	Jun 30, 2011	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Feb 28, 2011	Lead and Copper Rule
Jan 1, 2011	Jun 30, 2011	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Feb 28, 2011	Lead and Copper Rule
Jan 1, 2011	Jun 30, 2011	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Feb 28, 2011	Lead and Copper Rule
Jan 1, 2011	Dec 31, 2013	Asbestos	MR	No	Yes	—	7 MFL	—	Resolved	Jul 24, 2013	Inorganic Chemicals
Jan 1, 2011	Jun 30, 2011	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Feb 28, 2011	Lead and Copper Rule
Jan 1, 2011	Jun 30, 2011	Lead and Copper Rule	MR	No	No	—	TT	—	Resolved	Feb 28, 2011	Lead and Copper Rule
Dec 1, 2008	Dec 31, 2008	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2008	Total Coliform Rule
Dec 1, 2008	Dec 31, 2008	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2008	Total Coliform Rule
Dec 1, 2008	Dec 31, 2008	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2008	Total Coliform Rule
Dec 1, 2008	Dec 31, 2008	Coliform (TCR)	MR	No	No	—	5% of samples	—	Resolved	Dec 31, 2008	Total Coliform Rule
Jul 1, 2008	Jul 31, 2008	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2008	Total Coliform Rule
Jul 1, 2008	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 15, 2008	Consumer Confidence Rule
Jul 1, 2008	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 15, 2008	Consumer Confidence Rule
Jul 1, 2008	Jul 31, 2008	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2008	Total Coliform Rule
Jul 1, 2008	—	Consumer Confidence Rule	Other	No	No	—	—	—	Resolved	Aug 15, 2008	Consumer Confidence Rule
Jul 1, 2008	Jul 31, 2008	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2008	Total Coliform Rule
Jul 1, 2008	Jul 31, 2008	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2008	Total Coliform Rule
Jul 1, 2008	Jul 31, 2008	Coliform (TCR)	MCL	Yes	No	—	5% of samples	—	Resolved	Jul 31, 2008	Total Coliform Rule
Jan 1, 2008	Dec 31, 2016	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 2016	Radionuclides and Revised Rad Rule
Jan 1, 2008	Dec 31, 2016	Combined Radium (-226 and -228)	MR	No	Yes	—	5 pCi/L	—	Resolved	Dec 31, 2016	Radionuclides and Revised Rad Rule
Jan 1, 2008	Dec 31, 2016	Combined Radium (-226 and -228)	MR	No	Yes	—	5 pCi/L	—	Resolved	Dec 31, 2016	Radionuclides and Revised Rad Rule
Jan 1, 2008	Dec 31, 2016	Gross Alpha, Excl. Radon and U	MR	No	Yes	—	15 pCi/L	—	Resolved	Dec 31, 2016	Radionuclides and Revised Rad 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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