Is Mariano Lake Community School BIA required to publish a Consumer Confidence Report?

Yes. Mariano Lake Community School BIA 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 Mariano Lake Community School BIA’s next Consumer Confidence Report due?

Mariano Lake Community School BIA’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.

Crownpoint, NN

Mariano Lake Community School BIA Water System

Consumer Confidence Report status

Mariano Lake Community School BIA 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 Mariano Lake Community School BIA 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 Navajo Nation’s official records. Always confirm current status with Navajo Nation before making decisions based on this information.

System facts

System ID (PWSID): NN3534012
System type: Community Water System
Population served: 160
Service connections: 19
Ownership: federal government
Water source: groundwater (wells)

Mariano Lake Community School BIA is one of 125 community water systems in Navajo Nation in the 500 or fewer people size category, serving 160 people from groundwater.

As of August 1, 2026, its federal record holds 24 entries between 2000 and 2025, of which 1 remains open; none are health-based.

Of the 24, 15 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 Consumer Confidence Rule, and the Stage 1 Disinfectants and Disinfection Byproducts Rule.

Violation history

Monitoring and Reporting (DBP)
—
Chlorine
January 1, 2025 – January 7, 2025
Resolved
Public Notification Violation for NPDWR Violation
—
Public Notice
January 1, 2025
Unaddressed
Monitoring, Routine (RTCR)
—
Revised Total Coliform Rule
January 1, 2025 – January 7, 2025
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
October 1, 2023 – January 5, 2024
Resolved
Maximum Contaminant Level Violation, E. coli (RTCR)
Health-based
Revised Total Coliform Rule
August 1, 2023 – August 31, 2023
Resolved
Report Sample Result/Fail Monitor (RTCR)
—
Revised Total Coliform Rule
August 1, 2023 – October 4, 2023
Resolved
Sample Siting Plan Errors (RTCR)
—
Revised Total Coliform Rule
April 1, 2016 – March 26, 2025
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
November 1, 2015 – November 30, 2015
Resolved
Failure Submit IDSE/Subpart V Plan Rpt
—
Stage 2 Disinfectants and Disinfection Byproducts Rule
October 1, 2013 – March 26, 2025
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2012 – December 31, 2012
Resolved
Monitoring, Routine Minor (TCR)
—
Coliform (TCR)
September 1, 2008 – September 30, 2008
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2006 – March 16, 2007
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2005 – March 16, 2007
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
September 1, 2002 – September 30, 2002
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2002 – August 1, 2003
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
July 1, 2002 – July 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
June 1, 2002 – June 30, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
May 1, 2002 – May 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
March 1, 2002 – March 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
February 1, 2002 – February 28, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
January 1, 2002 – January 31, 2002
Resolved
Monitoring, Routine Major (TCR)
—
Coliform (TCR)
December 1, 2001 – December 31, 2001
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2001 – August 1, 2003
Resolved
Consumer Confidence Report Complete Failure to Report
—
Consumer Confidence Rule
July 1, 2000 – August 1, 2003
Resolved

Resolved addressed and confirmed by the stateUnaddressed no corrective action on record yet

Period	Violation	Contaminant / rule	Health-based	Status
January 1, 2025 – January 7, 2025	Monitoring and Reporting (DBP)	Chlorine	—	Resolved
January 1, 2025	Public Notification Violation for NPDWR Violation	Public Notice	—	Unaddressed
January 1, 2025 – January 7, 2025	Monitoring, Routine (RTCR)	Revised Total Coliform Rule	—	Resolved
October 1, 2023 – January 5, 2024	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
August 1, 2023 – August 31, 2023	Maximum Contaminant Level Violation, E. coli (RTCR)	Revised Total Coliform Rule	Health-based	Resolved
August 1, 2023 – October 4, 2023	Report Sample Result/Fail Monitor (RTCR)	Revised Total Coliform Rule	—	Resolved
April 1, 2016 – March 26, 2025	Sample Siting Plan Errors (RTCR)	Revised Total Coliform Rule	—	Resolved
November 1, 2015 – November 30, 2015	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
October 1, 2013 – March 26, 2025	Failure Submit IDSE/Subpart V Plan Rpt	Stage 2 Disinfectants and Disinfection Byproducts Rule	—	Resolved
July 1, 2012 – December 31, 2012	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
September 1, 2008 – September 30, 2008	Monitoring, Routine Minor (TCR)	Coliform (TCR)	—	Resolved
July 1, 2006 – March 16, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2005 – March 16, 2007	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
September 1, 2002 – September 30, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2002 – August 1, 2003	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2002 – July 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
June 1, 2002 – June 30, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
May 1, 2002 – May 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
March 1, 2002 – March 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
February 1, 2002 – February 28, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
January 1, 2002 – January 31, 2002	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
December 1, 2001 – December 31, 2001	Monitoring, Routine Major (TCR)	Coliform (TCR)	—	Resolved
July 1, 2001 – August 1, 2003	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved
July 1, 2000 – August 1, 2003	Consumer Confidence Report Complete Failure to Report	Consumer Confidence Rule	—	Resolved

Resolved addressed and confirmed by the stateUnaddressed no corrective action on record yet

Enforcement actions

December 5, 2025State Formal Notice of Violation issued1 linked violation
March 26, 2025State Compliance achieved1 linked violation
March 26, 2025State Compliance achieved1 linked violation
January 7, 2025State Compliance achieved1 linked violation
January 7, 2025State Compliance achieved1 linked violation
January 5, 2024State Compliance achieved1 linked violation
October 4, 2023State Compliance achieved1 linked violation
September 5, 2023State Compliance achieved1 linked violation
November 3, 2021State Compliance achievedgeneral compliance action — not tied to a specific violation on record
November 3, 2021State Compliance achievedgeneral compliance action — not tied to a specific violation on record
August 28, 2017State Public Notification issued1 linked violation
August 28, 2017State Public Notification issued1 linked violation
August 28, 2017State Formal Notice of Violation issued1 linked violation
August 28, 2017State Formal Notice of Violation issued1 linked violation
May 20, 2016State Compliance achieved1 linked violation
December 31, 2012State Compliance achieved1 linked violation
December 6, 2012State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
February 25, 2009State Compliance achieved1 linked violation
December 4, 2007State Compliance achieved8 linked violations
March 16, 2007State Compliance achieved2 linked violations
February 14, 2007State Violation/Reminder Noticegeneral compliance action — not tied to a specific violation on record
August 1, 2003State Compliance achieved3 linked violations

Common questions

Is Mariano Lake Community School BIA required to publish a Consumer Confidence Report?: Yes. Mariano Lake Community School BIA 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 Mariano Lake Community School BIA’s next Consumer Confidence Report due?: Mariano Lake Community School BIA’s next Consumer Confidence Report is due by July 1, 2027. The report covers calendar year 2026.
Does Mariano Lake Community School BIA have any open drinking water violations on record?: As of August 1, 2026, EPA's federal records show 1 item for Mariano Lake Community School BIA 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

Not on record

5057865265

Crownpoint, NM 87313