Is MASON CITY WATER DEPARTMENT required to publish a Consumer Confidence Report?

Yes. MASON CITY WATER DEPARTMENT 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 MASON CITY WATER DEPARTMENT’s next Consumer Confidence Report due?

MASON CITY WATER DEPARTMENT’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.

MASON CITY, IA · Cerro Gordo County

MASON CITY WATER DEPARTMENT Water System

Consumer Confidence Report status

MASON CITY WATER DEPARTMENT 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 MASON CITY WATER DEPARTMENT.

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): IA1750048
System type: Community Water System
Population served: 27,338
Service connections: 19,000
Ownership: local government
Water source: groundwater (wells)

MASON CITY WATER DEPARTMENT is among the 22 largest community water systems in Iowa, serving 27,338 people from groundwater.

As of August 1, 2026, its federal record holds 46 entries between 1982 and 2009, all of which EPA lists as closed. Nothing has been added since 2009.

Of the 46, 36 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 volatile organic chemicals, the Radionuclides and Revised Rad Rule, and synthetic organic chemicals.

Violation history

Monitoring and Reporting (DBP)
—
Total Haloacetic Acids (HAA5)
July 1, 2009 – August 31, 2009
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 2008 – June 30, 2008
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 2004 – December 31, 2004
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2004 – June 28, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2004 – September 30, 2004
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2003 – September 30, 2003
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2003 – March 31, 2003
Archived
Maximum Contaminant Level Violation, Single Sample
Health-based
Combined Radium (-226 and -228)
January 1, 2000 – December 31, 2000
Archived
Monitoring, Regular
—
Dinoseb
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Picloram
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Benzene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
p-Dichlorobenzene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
1,1-Dichloroethylene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
trans-1,2-Dichloroethylene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Styrene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
LASSO
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Atrazine
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Simazine
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Benzene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Ethylbenzene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Styrene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Tetrachloroethylene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Toluene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Xylenes, Total
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Benzo(a)pyrene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) adipate
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Di(2-ethylhexyl) phthalate
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Simazine
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Carbon tetrachloride
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
DICHLOROMETHANE
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Toluene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
1,1,2-Trichloroethane
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Trichloroethylene
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Vinyl chloride
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
2,4-D
January 1, 1995 – December 31, 1999
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
July 1, 1989 – September 30, 1989
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
April 1, 1989 – June 30, 1989
Resolved
Monitoring, Regular
—
Nitrate
July 1, 1988 – June 30, 1991
Resolved
Notification, Public
—
Combined Radium (-226 and -228)
July 1, 1986 – September 30, 1986
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
October 1, 1985 – September 30, 1986
Archived
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 1985 – September 30, 1985
Archived
Notification, Public
—
Combined Radium (-226 and -228)
October 1, 1982 – September 30, 1986
Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Period	Violation	Contaminant / rule	Health-based	Status
July 1, 2009 – August 31, 2009	Monitoring and Reporting (DBP)	Total Haloacetic Acids (HAA5)	—	Resolved
June 1, 2008 – June 30, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2004 – December 31, 2004	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
July 1, 2004 – June 28, 2006	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2004 – September 30, 2004	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
July 1, 2003 – September 30, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2003 – March 31, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
January 1, 2000 – December 31, 2000	Maximum Contaminant Level Violation, Single Sample	Combined Radium (-226 and -228)	Health-based	Archived
January 1, 1995 – December 31, 1999	Monitoring, Regular	Dinoseb	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Picloram	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Benzene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	p-Dichlorobenzene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	1,1-Dichloroethylene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	trans-1,2-Dichloroethylene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Styrene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	LASSO	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Atrazine	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Simazine	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Benzene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Ethylbenzene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Styrene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Tetrachloroethylene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Toluene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Xylenes, Total	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Benzo(a)pyrene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Di(2-ethylhexyl) adipate	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Di(2-ethylhexyl) phthalate	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Simazine	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Carbon tetrachloride	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	DICHLOROMETHANE	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Toluene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	1,1,2-Trichloroethane	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Trichloroethylene	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	Vinyl chloride	—	Resolved
January 1, 1995 – December 31, 1999	Monitoring, Regular	2,4-D	—	Resolved
July 1, 1989 – September 30, 1989	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
April 1, 1989 – June 30, 1989	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
July 1, 1988 – June 30, 1991	Monitoring, Regular	Nitrate	—	Resolved
July 1, 1986 – September 30, 1986	Notification, Public	Combined Radium (-226 and -228)	—	Resolved
October 1, 1985 – September 30, 1986	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
April 1, 1985 – September 30, 1985	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
October 1, 1982 – September 30, 1986	Notification, Public	Combined Radium (-226 and -228)	—	Resolved

Resolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

October 17, 2024State Compliance achieved1 linked violation
July 18, 2024State Public Notification requested1 linked violation
July 18, 2024State Formal Notice of Violation issued1 linked violation
July 8, 2024State Compliance achieved1 linked violation
September 18, 2012State Compliance achieved2 linked violations
September 11, 2012State Public Notification received1 linked violation
August 24, 2012State Formal Notice of Violation issued1 linked violation
August 24, 2012State Public Notification requested4 linked violations
August 22, 2012State Violation/Reminder Notice1 linked violation
July 11, 2006State Compliance achieved2 linked violations
June 28, 2006State Public Notification requested1 linked violation
June 28, 2006State Public Notification received1 linked violation
June 28, 2006State Compliance achieved1 linked violation
June 28, 2006State Public Notification requested2 linked violations
June 28, 2006State Formal Notice of Violation issued1 linked violation
June 28, 2006State Public Notification received2 linked violations
June 28, 2006State Public Notification requested3 linked violations
June 28, 2006State Public Notification received3 linked violations
June 28, 2006State Compliance achieved3 linked violations
June 28, 2006State Formal Notice of Violation issued1 linked violation
June 28, 2006State Compliance achieved2 linked violations
June 28, 2006State Public Notification received2 linked violations
June 28, 2006State Compliance achieved1 linked violation
June 28, 2006State Public Notification received7 linked violations
February 24, 2006State Compliance achieved1 linked violation
February 24, 2006State Compliance achieved1 linked violation
February 24, 2006State Compliance achieved1 linked violation
February 24, 2006State Compliance achieved3 linked violations
February 24, 2006State Compliance achieved2 linked violations
February 24, 2006State Compliance achieved3 linked violations
February 24, 2006State Compliance achieved1 linked violation
February 24, 2006State Compliance achieved1 linked violation
December 20, 2005State Compliance achieved2 linked violations
December 20, 2005State Compliance achieved2 linked violations
December 20, 2005State Compliance achieved2 linked violations
July 27, 2005State Public Notification requested1 linked violation
July 27, 2005State Formal Notice of Violation issued1 linked violation
April 21, 2005State Compliance achieved3 linked violations
April 11, 2005State Compliance achieved4 linked violations
April 11, 2005State Compliance achieved11 linked violations
April 11, 2005State Compliance achieved3 linked violations
April 11, 2005State Compliance achieved3 linked violations
March 31, 2005State Compliance achieved2 linked violations
February 11, 2005State Compliance achieved4 linked violations
February 11, 2005State Compliance achieved3 linked violations
February 11, 2005State Compliance achieved1 linked violation
December 30, 2004State Public Notification received2 linked violations
September 14, 2004State Public Notification received1 linked violation
August 6, 2004State Public Notification requested1 linked violation
August 6, 2004State Formal Notice of Violation issued3 linked violations
April 16, 2004State Public Notification requested3 linked violations
February 2, 2004State Formal Notice of Violation issued1 linked violation
February 2, 2004State Formal Notice of Violation issued2 linked violations
February 2, 2004State Formal Notice of Violation issued5 linked violations
February 2, 2004State Formal Notice of Violation issued10 linked violations
February 2, 2004State Public Notification requested2 linked violations
February 2, 2004State Public Notification requested3 linked violations
February 2, 2004State Public Notification requested4 linked violations
February 2, 2004State Public Notification requested1 linked violation
February 2, 2004State Public Notification requested2 linked violations
February 2, 2004State Public Notification requested1 linked violation
February 2, 2004State Formal Notice of Violation issued3 linked violations
February 2, 2004State Public Notification requested1 linked violation
February 2, 2004State Formal Notice of Violation issued3 linked violations
February 2, 2004State Formal Notice of Violation issued1 linked violation
February 2, 2004State Formal Notice of Violation issued3 linked violations
February 2, 2004State Formal Notice of Violation issued1 linked violation
February 2, 2004State Public Notification requested2 linked violations
February 2, 2004State Formal Notice of Violation issued3 linked violations
February 2, 2004State Formal Notice of Violation issued5 linked violations
January 30, 2004State Public Notification requested3 linked violations
January 30, 2004State Violation/Reminder Notice4 linked violations
December 16, 2003State Compliance achieved1 linked violation
December 16, 2003State Compliance achieved1 linked violation
October 8, 2003State Public Notification received1 linked violation
September 26, 2003State Compliance achievedgeneral compliance action — not tied to a specific violation on record
January 15, 2003State Public Notification requested3 linked violations
October 16, 2002State Formal Notice of Violation issued3 linked violations
October 16, 2002State Public Notification requested3 linked violations
April 17, 2002State Public Notification received5 linked violations
February 7, 2000State Compliance achieved6 linked violations
February 7, 2000State Compliance achieved4 linked violations
February 7, 2000State Compliance achieved6 linked violations
February 7, 2000State Compliance achieved6 linked violations
February 7, 2000State Compliance achieved10 linked violations
February 7, 2000State Compliance achieved5 linked violations
February 7, 2000State Compliance achieved7 linked violations
February 7, 2000State Compliance achieved5 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved5 linked violations
February 7, 2000State Compliance achieved5 linked violations
February 7, 2000State Compliance achieved4 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved4 linked violations
February 7, 2000State Compliance achieved4 linked violations
February 7, 2000State Compliance achieved5 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved5 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 7, 2000State Compliance achieved2 linked violations
February 7, 2000State Compliance achieved2 linked violations
February 7, 2000State Compliance achieved3 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received2 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received2 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received7 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received5 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received2 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received2 linked violations
February 3, 2000State Public Notification received6 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received8 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received8 linked violations
February 3, 2000State Public Notification received4 linked violations
February 3, 2000State Public Notification received3 linked violations
February 3, 2000State Public Notification received5 linked violations
February 3, 2000State Public Notification received5 linked violations
February 3, 2000State Public Notification received5 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued5 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Public Notification requested4 linked violations
January 14, 2000State Formal Notice of Violation issued2 linked violations
January 14, 2000State Formal Notice of Violation issued2 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Public Notification requested3 linked violations
January 14, 2000State Public Notification requested4 linked violations
January 14, 2000State Public Notification requested4 linked violations
January 14, 2000State Public Notification requested6 linked violations
January 14, 2000State Public Notification requested3 linked violations
January 14, 2000State Public Notification requested2 linked violations
January 14, 2000State Public Notification requested3 linked violations
January 14, 2000State Public Notification requested3 linked violations
January 14, 2000State Public Notification requested9 linked violations
January 14, 2000State Public Notification requested3 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued2 linked violations
January 14, 2000State Formal Notice of Violation issued5 linked violations
January 14, 2000State Formal Notice of Violation issued5 linked violations
January 14, 2000State Formal Notice of Violation issued8 linked violations
January 14, 2000State Formal Notice of Violation issued2 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued7 linked violations
January 14, 2000State Formal Notice of Violation issued15 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Formal Notice of Violation issued7 linked violations
January 14, 2000State Formal Notice of Violation issued5 linked violations
January 14, 2000State Formal Notice of Violation issued3 linked violations
January 14, 2000State Formal Notice of Violation issued4 linked violations
January 14, 2000State Public Notification requested2 linked violations
January 14, 2000State Public Notification requested2 linked violations
January 14, 2000State Public Notification requested4 linked violations
January 14, 2000State Public Notification requested3 linked violations
January 14, 2000State Public Notification requested6 linked violations
January 14, 2000State Public Notification requested5 linked violations
January 14, 2000State Public Notification requested5 linked violations
January 14, 2000State Public Notification requested4 linked violations
January 14, 2000State Public Notification requested2 linked violations
January 14, 2000State Public Notification requested2 linked violations
January 14, 2000State Public Notification requested2 linked violations
July 12, 1993State Compliance achieved3 linked violations
March 25, 1992State Compliance achieved1 linked violation
March 6, 1992State Formal Notice of Violation issued1 linked violation
March 6, 1992State Formal Notice of Violation issued2 linked violations
March 6, 1992State Public Notification requested4 linked violations
December 1, 1989State Formal Notice of Violation issued1 linked violation
October 20, 1989State Compliance achieved1 linked violation
November 16, 1986State Formal Notice of Violation issued1 linked violation

Common questions

Is MASON CITY WATER DEPARTMENT required to publish a Consumer Confidence Report?: Yes. MASON CITY WATER DEPARTMENT 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 MASON CITY WATER DEPARTMENT’s next Consumer Confidence Report due?: MASON CITY WATER DEPARTMENT’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does MASON CITY WATER DEPARTMENT have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show no open violations for MASON CITY WATER DEPARTMENT.
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

MASON CITY WATER DEPARTMENT

641-421-3683

MASON CITY, IA 50401