LYONS, CO · Boulder County

LYONS TOWN OF Water System

Current status

No open violations on record as of July 4, 2026.

This system's next federally required Consumer Confidence Report is due July 1, 2027, under the EPA's revised reporting rule.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed July 4, 2026. This is a record-keeping and public-information tool — it does not replace Colorado’s official records. Always confirm current status with Colorado before making decisions based on this information.

System facts

System ID (PWSID): CO0107496
System type: Community Water System
Population served: 2,990
Service connections: 962
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2009 – September 30, 2009
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
June 1, 1999 – June 30, 1999
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
May 1, 1999 – May 31, 1999
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
April 1, 1998 – April 30, 1998
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
September 1, 1997 – September 30, 1997
Resolved
Public Education
Health-based
Lead and Copper Rule
January 1, 1997 – December 31, 1997
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
July 1, 1995 – July 31, 1995
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
May 1, 1995 – May 31, 1995
Resolved
Monitoring, Regular
—
Nitrate-Nitrite
January 1, 1995 – December 31, 1995
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
January 1, 1992 – December 31, 1995
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
September 1, 2009 – September 30, 2009	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 1999 – June 30, 1999	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
May 1, 1999 – May 31, 1999	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
April 1, 1998 – April 30, 1998	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
September 1, 1997 – September 30, 1997	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 1997 – December 31, 1997	Public Education	Lead and Copper Rule	Health-based	Resolved
July 1, 1995 – July 31, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
May 1, 1995 – May 31, 1995	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 1995 – December 31, 1995	Monitoring, Regular	Nitrate-Nitrite	—	Resolved
January 1, 1992 – December 31, 1995	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

August 16, 2010State Compliance achieved2 linked violations
November 6, 2009State Public Notification received3 linked violations
October 19, 2009State Public Notification requested1 linked violation
October 19, 2009State Violation/Reminder Notice1 linked violation
August 25, 2008State Compliance achieved25 linked violations
August 22, 2008State Public Notification requested2 linked violations
August 22, 2008State Violation/Reminder Notice7 linked violations
December 7, 2000State Compliance achieved2 linked violations
September 9, 1999State Formal Notice of Violation issued8 linked violations
August 18, 1999State Formal Notice of Violation issued42 linked violations
May 30, 1999State Public Notification requested30 linked violations
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued2 linked violations
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
June 19, 1998State Administrative/Compliance Order without penalty issued1 linked violation
April 28, 1998State Public Notification requested1 linked violation
March 18, 1998State Public Notification requested1 linked violation
March 18, 1998State Public Notification requested1 linked violation
November 18, 1997State Public Notification requested2 linked violations
September 12, 1997State Public Notification requested1 linked violation
July 30, 1997State Public Notification requested2 linked violations
May 13, 1997State Public Notification requested3 linked violations
October 21, 1996State Formal Notice of Violation issued3 linked violations
October 21, 1996State Public Notification requested1 linked violation
September 12, 1996State Public Notification requested1 linked violation
August 15, 1996State Public Notification requested1 linked violation
March 25, 1996State Compliance achieved2 linked violations
March 4, 1996State Public Notification requested1 linked violation
March 4, 1996State Formal Notice of Violation issued1 linked violation
August 11, 1995State Formal Notice of Violation issued7 linked violations
May 8, 1995State Formal Notice of Violation issued2 linked violations
September 20, 1993State Formal Notice of Violation issued3 linked violations
September 20, 1993State Public Notification requested1 linked violation

Contact

SIMONSEN, VICTORIA

303-823-6622

LYONS, CO 80540