SIOUX CITY, IA · Woodbury County

SIOUX CITY WATER SUPPLY 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 Iowa’s official records. Always confirm current status with Iowa before making decisions based on this information.

System facts

System ID (PWSID): IA9778054
System type: Community Water System
Population served: 85,791
Service connections: 29,424
Ownership: local government
Water source: surface water (rivers, lakes, or reservoirs)

Violation history

Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
May 1, 2024 – May 31, 2024
Resolved
Monitoring and Reporting (DBP)
—
TTHM
May 1, 2024 – May 31, 2024
Resolved
Treatment Techniques
Health-based
Epichlorohydrin
March 6, 2017 – March 7, 2017
Resolved
Treatment Techniques
Health-based
Epichlorohydrin
November 25, 2016 – November 26, 2016
Resolved
Treatment Techniques
Health-based
Epichlorohydrin
May 19, 2016 – May 20, 2016
Resolved
Monitoring, Turbidity (Enhanced SWTR)
—
Interim Enhanced Surface Water Treatment Rule
May 1, 2015 – May 31, 2015
Resolved
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
April 1, 2012 – April 30, 2012
Resolved
Monitoring, Regular
—
Selenium
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Mercury
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Antimony, Total
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Thallium, Total
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Arsenic
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Barium
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Cadmium
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Chromium
July 1, 2001 – June 30, 2002
Resolved
Monitoring, Regular
—
Fluoride
July 1, 2001 – June 30, 2002
Resolved
Variance/Exemption/Other Compliance
—
No contaminant on record
January 1, 2001 – December 31, 2001
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
August 1, 1997 – August 31, 1997
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 1991 – June 30, 1991
Resolved

Resolved addressed and confirmed by the state

Period	Violation	Contaminant / rule	Health-based	Status
May 1, 2024 – May 31, 2024	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
May 1, 2024 – May 31, 2024	Monitoring and Reporting (DBP)	TTHM	—	Resolved
March 6, 2017 – March 7, 2017	Treatment Techniques	Epichlorohydrin	Health-based	Resolved
November 25, 2016 – November 26, 2016	Treatment Techniques	Epichlorohydrin	Health-based	Resolved
May 19, 2016 – May 20, 2016	Treatment Techniques	Epichlorohydrin	Health-based	Resolved
May 1, 2015 – May 31, 2015	Monitoring, Turbidity (Enhanced SWTR)	Interim Enhanced Surface Water Treatment Rule	—	Resolved
April 1, 2012 – April 30, 2012	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Selenium	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Mercury	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Antimony, Total	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Thallium, Total	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Arsenic	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Barium	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Cadmium	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Chromium	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Fluoride	—	Resolved
January 1, 2001 – December 31, 2001	Variance/Exemption/Other Compliance	—	—	Resolved
August 1, 1997 – August 31, 1997	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 1991 – June 30, 1991	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved

Resolved addressed and confirmed by the state

Enforcement actions

May 12, 2025State Public Notification received1 linked violation
May 12, 2025State Public Notification received1 linked violation
August 13, 2024State Compliance achieved1 linked violation
August 13, 2024State Compliance achieved1 linked violation
July 17, 2024State Formal Notice of Violation issued1 linked violation
July 17, 2024State Public Notification requested2 linked violations
February 11, 2020State Compliance achieved1 linked violation
February 11, 2020State Compliance achieved1 linked violation
January 15, 2020State Public Notification received5 linked violations
December 3, 2019State Formal Notice of Violation issued3 linked violations
December 3, 2019State Public Notification requested1 linked violation
September 30, 2019State Public Notification received1 linked violation
August 22, 2019State Public Notification issued1 linked violation
August 21, 2019State Formal Notice of Violation issued1 linked violation
August 21, 2019State Public Notification requested1 linked violation
April 30, 2017State Compliance achieved1 linked violation
April 14, 2017State Public Notification received1 linked violation
March 22, 2017State Formal Notice of Violation issued1 linked violation
January 17, 2017State Public Notification received1 linked violation
December 31, 2016State Compliance achieved1 linked violation
December 16, 2016State Public Notification requested1 linked violation
December 16, 2016State Formal Notice of Violation issued1 linked violation
June 30, 2016State Compliance achieved1 linked violation
June 6, 2016State Public Notification received1 linked violation
June 6, 2016State Public Notification received1 linked violation
May 20, 2016State Formal Notice of Violation issued1 linked violation
June 30, 2015State Compliance achieved1 linked violation
June 15, 2015State Public Notification requested1 linked violation
June 15, 2015State Formal Notice of Violation issued1 linked violation
June 24, 2013State Public Notification received1 linked violation
June 24, 2013State Public Notification received1 linked violation
August 31, 2012State Compliance achieved1 linked violation
August 16, 2012State Public Notification requested2 linked violations
August 6, 2012State Formal Notice of Violation issued2 linked violations
May 31, 2012State Compliance achieved2 linked violations
May 7, 2012State Formal Notice of Violation issued4 linked violations
January 1, 2005State Compliance achieved4 linked violations
January 1, 2005State Compliance achieved5 linked violations
December 9, 2004State Public Notification received2 linked violations
November 12, 2004State Formal Notice of Violation issued4 linked violations
August 23, 2002State Public Notification requested2 linked violations
August 23, 2002State Formal Notice of Violation issued2 linked violations
August 23, 2002State Formal Notice of Violation issued2 linked violations
August 23, 2002State Public Notification requested3 linked violations
August 23, 2002State Formal Notice of Violation issued4 linked violations
August 23, 2002State Formal Notice of Violation issued4 linked violations
June 18, 2002State Public Notification received5 linked violations
June 29, 2001State Public Notification received3 linked violations
April 19, 2001State Public Notification requested6 linked violations
March 7, 2001State Consent Decree/Judgement2 linked violations
February 23, 1998State Compliance achieved3 linked violations
November 23, 1996State Compliance achieved2 linked violations
June 27, 1996State Public Notification requested3 linked violations
June 27, 1996State Public Notification requested2 linked violations
July 1, 1991State Formal Notice of Violation issued4 linked violations
July 1, 1991State Public Notification received3 linked violations
July 1, 1991State Public Notification requested5 linked violations
June 13, 1991State Compliance achieved2 linked violations
April 9, 1990State Compliance achievedgeneral compliance action — not tied to a specific violation on record
April 9, 1990State Compliance achievedgeneral compliance action — not tied to a specific violation on record
January 19, 1982State Unresolved6 linked violations

Contact

SIOUX CITY WATER SUPPLY

712-279-6150

SIOUX CITY, IA 51103