Is SIOUX CITY WATER SUPPLY required to publish a Consumer Confidence Report?

Yes. SIOUX CITY WATER SUPPLY is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.

When is SIOUX CITY WATER SUPPLY’s next Consumer Confidence Report due?

SIOUX CITY WATER SUPPLY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.

What is a Consumer Confidence Report?

A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

SIOUX CITY, IA · Woodbury County

SIOUX CITY WATER SUPPLY Water System

Consumer Confidence Report status

SIOUX CITY WATER SUPPLY must publish a Consumer Confidence Report — the annual drinking water quality report covering calendar year 2026 — by July 1, 2027.

As of August 1, 2026, EPA's federal records show no open violations for SIOUX CITY WATER SUPPLY.

Data sourced from the EPA ECHO database (SDWA bulk download), last refreshed August 1, 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)

SIOUX CITY WATER SUPPLY is the fourth largest community water system in Iowa, serving 85,791 people from surface water.

As of August 1, 2026, its federal record holds 17 entries between 1991 and 2024, all of which EPA lists as closed.

Of the 17, 11 are monitoring and reporting requirements — the category that accounts for about four in five of all violations in EPA's national dataset — rather than findings about the water itself. The record involves inorganic chemicals, the Surface Water Treatment Rules, and the Miscellaneous Other Rules.

Violation history

Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
May 1, 2024 – May 31, 2024
Resolved
Treatment Techniques
Health-based
Epichlorohydrin
March 6, 2017 – March 7, 2017
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
Treatment Technique (SWTR and GWR)
Health-based
Surface Water Treatment Rule
March 1, 2004 – March 31, 2004
Resolved
Variance/Exemption/Other Compliance
—
No contaminant on record
January 1, 2002 – December 31, 2002
Resolved
Monitoring, Regular
—
Selenium
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
Monitoring, Regular
—
Mercury
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, 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
March 6, 2017 – March 7, 2017	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
March 1, 2004 – March 31, 2004	Treatment Technique (SWTR and GWR)	Surface Water Treatment Rule	Health-based	Resolved
January 1, 2002 – December 31, 2002	Variance/Exemption/Other Compliance	—	—	Resolved
July 1, 2001 – June 30, 2002	Monitoring, Regular	Selenium	—	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
July 1, 2001 – June 30, 2002	Monitoring, Regular	Mercury	—	Resolved
January 1, 2001 – December 31, 2001	Variance/Exemption/Other Compliance	—	—	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 Formal Notice of Violation issued1 linked violation
December 16, 2016State Public Notification requested1 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 Formal Notice of Violation issued1 linked violation
June 15, 2015State Public Notification requested1 linked violation
June 24, 2013State Public Notification received2 linked violations
August 16, 2012State Public Notification requested2 linked violations
August 6, 2012State Formal Notice of Violation issued2 linked violations
June 5, 2012State Public Notification received3 linked violations
May 7, 2012State Public Notification requested3 linked violations
January 1, 2005State Compliance achieved2 linked violations
August 26, 2002State Compliance achieved5 linked violations
August 26, 2002State Compliance achieved5 linked violations
August 23, 2002State Formal Notice of Violation issued2 linked violations
August 23, 2002State Public Notification requested2 linked violations
August 23, 2002State Public Notification requested3 linked violations
August 23, 2002State Public Notification requested3 linked violations
August 23, 2002State Public Notification requested3 linked violations
April 19, 2001State Formal Notice of Violation issued5 linked violations
March 7, 2001State Consent Decree/Judgement2 linked violations
February 23, 1998State Compliance achieved3 linked violations
May 1, 1997State Formal Notice of Violation issued11 linked violations
June 27, 1996State Public Notification requested2 linked violations
June 27, 1996State Public Notification requested3 linked violations
June 27, 1996State Formal Notice of Violation issued3 linked violations
July 1, 1991State Formal Notice of Violation issued4 linked violations
June 13, 1991State Compliance achieved2 linked violations
June 13, 1991State Public Notification requested2 linked violations
April 9, 1990State Compliance achievedgeneral compliance action — not tied to a specific violation on record

Common questions

Is SIOUX CITY WATER SUPPLY required to publish a Consumer Confidence Report?: Yes. SIOUX CITY WATER SUPPLY is a community water system, and federal rules (40 CFR 141 Subpart O) require every community water system to publish a Consumer Confidence Report each year.
When is SIOUX CITY WATER SUPPLY’s next Consumer Confidence Report due?: SIOUX CITY WATER SUPPLY’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does SIOUX CITY WATER SUPPLY have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for SIOUX CITY WATER SUPPLY.
What is a Consumer Confidence Report?: A Consumer Confidence Report (CCR) is the annual drinking water quality report that community water systems must provide to the people they serve. It lists the contaminants detected in the system’s water during the year, where the water comes from, and how the results compare with federal limits. EPA’s revised CCR rule takes effect January 1, 2027, and the first reports in the new format are due July 1, 2027.

Contact

SIOUX CITY WATER SUPPLY

712-279-6150

SIOUX CITY, IA 51103