Is POTOSI PWS required to publish a Consumer Confidence Report?

Yes. POTOSI PWS 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 POTOSI PWS’s next Consumer Confidence Report due?

POTOSI PWS’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.

POTOSI, MO · Washington County

POTOSI PWS Water System

Consumer Confidence Report status

POTOSI PWS 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 1 item for POTOSI PWS that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.

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 Missouri’s official records. Always confirm current status with Missouri before making decisions based on this information.

System facts

System ID (PWSID): MO6010659
System type: Community Water System
Population served: 2,527
Service connections: 1,236
Ownership: local government
Water source: groundwater (wells)

POTOSI PWS is one of 489 community water systems in Missouri in the 501 to 3,300 people size category, serving 2,527 people from groundwater.

As of August 1, 2026, its federal record holds 60 entries between 1981 and 2025, of which 1 remains open; none are health-based.

Of the 60, 8 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 the Total Coliform Rules, the Radionuclides and Revised Rad Rule, and the Public Notice Rule and Revised PN Rule.

Violation history

Notification, Known or Potential LSL
—
LEAD AND COPPER RULE REVISIONS
July 2, 2025
Unaddressed
Public Notification Violation for NPDWR Violation
—
Public Notice
April 27, 2024 – May 17, 2024
Resolved
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
March 1, 2023 – March 31, 2023
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
December 1, 2015 – December 31, 2015
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2015 – September 30, 2015
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2014 – November 30, 2014
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
June 1, 2013 – June 30, 2013
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2012 – October 31, 2012
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2012 – August 31, 2012
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
April 1, 2012 – April 30, 2012
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
November 10, 2011 – October 13, 2011
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
September 14, 2011 – August 18, 2011
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2011 – September 30, 2011
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2011 – July 31, 2011
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
May 31, 2011 – May 24, 2012
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
April 1, 2011 – April 30, 2011
Resolved
Monitoring, Source Water (GWR)
—
E. COLI
September 1, 2010 – January 31, 2012
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2010 – July 31, 2010
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
July 1, 2008 – July 31, 2008
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 2008 – May 31, 2008
Resolved
Monitoring, Regular
—
Combined Radium (-226 and -228)
October 1, 2007 – December 31, 2007
Resolved
Monitoring, Regular
—
Gross Alpha, Excl. Radon and U
October 1, 2007 – December 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2007 – March 31, 2008
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2007 – March 31, 2008
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2007 – December 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2007 – December 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2006 – November 30, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
October 1, 2006 – October 31, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 2006 – August 14, 2006
Resolved
Maximum Contaminant Level Violation, Acute (TCR)
Health-based
Coliform (TCR)
August 1, 2006 – August 14, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2006 – March 31, 2007
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2006 – March 31, 2007
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
February 1, 2006 – February 28, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2006 – December 31, 2006
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2005 – November 30, 2005
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
October 1, 2005 – September 30, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2005 – March 31, 2006
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
October 1, 2004 – September 30, 2005
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
October 1, 2004 – September 30, 2005
Archived
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
July 1, 2004 – June 30, 2005
Archived
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2004 – December 31, 2004
Archived
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
October 1, 2003 – September 30, 2004
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 2003 – September 30, 2003
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
July 1, 2003 – June 30, 2004
Archived
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
April 1, 2003 – March 31, 2004
Archived
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2003 – December 31, 2003
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 2002 – November 30, 2002
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
July 1, 2002 – June 30, 2003
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
May 1, 2002 – May 31, 2002
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 2002 – April 30, 2002
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
April 1, 2002 – March 31, 2003
Archived
Maximum Contaminant Level Violation, Average
Health-based
Gross Alpha, Excl. Radon and U
January 1, 2002 – December 31, 2002
Archived
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 1, 2002 – December 31, 2002
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
August 1, 1996 – August 31, 1996
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
February 1, 1995 – January 31, 1996
Archived
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
November 1, 1994 – November 30, 1994
Resolved
Maximum Contaminant Level Violation, Monthly (TCR)
Health-based
Coliform (TCR)
September 1, 1993 – September 30, 1993
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 1993 – July 31, 1993
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
April 1, 1992 – April 30, 1992
Resolved
Maximum Contaminant Level Violation, Average
Health-based
Combined Radium (-226 and -228)
January 12, 1981 – October 11, 1982
Archived

Unaddressed no corrective action on record yetResolved 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 2, 2025	Notification, Known or Potential LSL	LEAD AND COPPER RULE REVISIONS	—	Unaddressed
April 27, 2024 – May 17, 2024	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
March 1, 2023 – March 31, 2023	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
December 1, 2015 – December 31, 2015	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 2015 – September 30, 2015	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
November 1, 2014 – November 30, 2014	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
June 1, 2013 – June 30, 2013	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2012 – October 31, 2012	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
August 1, 2012 – August 31, 2012	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
April 1, 2012 – April 30, 2012	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
November 10, 2011 – October 13, 2011	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
September 14, 2011 – August 18, 2011	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
September 1, 2011 – September 30, 2011	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2011 – July 31, 2011	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
May 31, 2011 – May 24, 2012	Public Notification Violation for NPDWR Violation	Public Notice	—	Resolved
April 1, 2011 – April 30, 2011	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 2010 – January 31, 2012	Monitoring, Source Water (GWR)	E. COLI	—	Resolved
July 1, 2010 – July 31, 2010	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2008 – July 31, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
May 1, 2008 – May 31, 2008	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2007 – December 31, 2007	Monitoring, Regular	Combined Radium (-226 and -228)	—	Resolved
October 1, 2007 – December 31, 2007	Monitoring, Regular	Gross Alpha, Excl. Radon and U	—	Resolved
April 1, 2007 – March 31, 2008	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
April 1, 2007 – March 31, 2008	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
January 1, 2007 – December 31, 2007	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
January 1, 2007 – December 31, 2007	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
November 1, 2006 – November 30, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2006 – October 31, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
August 1, 2006 – August 14, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
August 1, 2006 – August 14, 2006	Maximum Contaminant Level Violation, Acute (TCR)	Coliform (TCR)	Health-based	Resolved
April 1, 2006 – March 31, 2007	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
April 1, 2006 – March 31, 2007	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Resolved
February 1, 2006 – February 28, 2006	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
January 1, 2006 – December 31, 2006	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
November 1, 2005 – November 30, 2005	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
October 1, 2005 – September 30, 2006	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
April 1, 2005 – March 31, 2006	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
October 1, 2004 – September 30, 2005	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Resolved
October 1, 2004 – September 30, 2005	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
July 1, 2004 – June 30, 2005	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Archived
January 1, 2004 – December 31, 2004	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
October 1, 2003 – September 30, 2004	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Archived
September 1, 2003 – September 30, 2003	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2003 – June 30, 2004	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Archived
April 1, 2003 – March 31, 2004	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Archived
January 1, 2003 – December 31, 2003	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Archived
November 1, 2002 – November 30, 2002	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 2002 – June 30, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
May 1, 2002 – May 31, 2002	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
April 1, 2002 – April 30, 2002	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
April 1, 2002 – March 31, 2003	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
January 1, 2002 – December 31, 2002	Maximum Contaminant Level Violation, Average	Gross Alpha, Excl. Radon and U	Health-based	Archived
January 1, 2002 – December 31, 2002	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
August 1, 1996 – August 31, 1996	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
February 1, 1995 – January 31, 1996	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived
November 1, 1994 – November 30, 1994	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
September 1, 1993 – September 30, 1993	Maximum Contaminant Level Violation, Monthly (TCR)	Coliform (TCR)	Health-based	Resolved
July 1, 1993 – July 31, 1993	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
April 1, 1992 – April 30, 1992	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
January 12, 1981 – October 11, 1982	Maximum Contaminant Level Violation, Average	Combined Radium (-226 and -228)	Health-based	Archived

Unaddressed no corrective action on record yetResolved addressed and confirmed by the stateArchived closed in EPA's records (typically due to age or a data correction)

Enforcement actions

May 17, 2024State Compliance achieved2 linked violations
April 27, 2023State Violation/Reminder Notice2 linked violations
April 17, 2023State Compliance achieved2 linked violations
May 3, 2016State Compliance achieved2 linked violations
February 4, 2016State Compliance achieved13 linked violations
December 18, 2015State Formal Notice of Violation issued2 linked violations
September 4, 2015State Formal Notice of Violation issued2 linked violations
February 5, 2015State Compliance achieved14 linked violations
November 21, 2014State Public Notification requested2 linked violations
January 22, 2014State Compliance achieved18 linked violations
January 22, 2014State Compliance achieved5 linked violations
July 1, 2013State Public Notification received2 linked violations
June 19, 2013State Violation/Reminder Notice5 linked violations
June 11, 2013State Formal Notice of Violation issued2 linked violations
May 20, 2013State Compliance achieved4 linked violations
November 6, 2012State Violation/Reminder Notice5 linked violations
October 17, 2012State Public Notification requested3 linked violations
May 18, 2012State Violation/Reminder Notice4 linked violations
April 20, 2012State Violation/Reminder Notice3 linked violations
January 31, 2012State Compliance achieved17 linked violations
September 30, 2011State Public Notification requested3 linked violations
August 4, 2011State Violation/Reminder Notice3 linked violations
December 31, 2010State Compliance achieved22 linked violations
October 26, 2010State Public Notification requested4 linked violations
July 15, 2010State Violation/Reminder Notice5 linked violations
May 23, 2008State Public Notification requested3 linked violations
December 11, 2007State Public Notification received2 linked violations
September 10, 2007State Public Notification received6 linked violations
June 8, 2007State Public Notification received39 linked violations
November 30, 2006State Violation/Reminder Notice4 linked violations
October 27, 2006State Public Notification requested4 linked violations
September 14, 2006State Public Notification received21 linked violations
August 28, 2006State Violation/Reminder Notice11 linked violations
August 14, 2006State Compliance achieved4 linked violations
August 7, 2006State Public Notification issued8 linked violations
May 5, 2006State Bilateral Compliance Agreement signed9 linked violations
April 28, 2006State Public Notification requested7 linked violations
April 5, 2006State Public Notification received6 linked violations
August 15, 2005State Public Notification requested12 linked violations
July 1, 2005State Public Notification received9 linked violations
May 10, 2005State Public Notification received3 linked violations
January 7, 2005State Public Notification received11 linked violations
September 25, 2004State Public Notification received7 linked violations
March 3, 2004State Violation/Reminder Notice17 linked violations
March 3, 2004State Public Notification requested15 linked violations
June 6, 2002State Public Notification requested2 linked violations

Common questions

Is POTOSI PWS required to publish a Consumer Confidence Report?: Yes. POTOSI PWS 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 POTOSI PWS’s next Consumer Confidence Report due?: POTOSI PWS’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does POTOSI PWS have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show 1 item for POTOSI PWS that is open and awaiting resolution. None are health-based violations — open items of this kind are most often monitoring or reporting requirements, not water-safety findings.
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

BLOUNT, JOSEPH

573-854-3898

POTOSI, MO 63664-0000