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Public water system record

Rio Mercado Water

On record as serving Tucson, Pima County, AZ · Serves 266 people

Federal records show 1 health-based violation and 8 monitoring/reporting issues for Rio Mercado Water in the last ten years. The most serious issue in this window was a resolved LEAD AND COPPER RULE REVISIONS violation.

  • AZ0410968
  • TUCSON
  • AZ
  • 266 served

System profile

Source water Groundwater
ZIP 85719
EPA system ID AZ0410968

Verify this system on EPA ECHO →

Health-based violations, last 10 years
1
Resolved
1
Unresolved
0
Any acute record
No
Monitoring issues, last 10 years
8

Key facts

  • Rio Mercado Water draws water from 1 well.
  • Lead pipe inventory: 0 lead and 0 unknown out of 90 service lines.

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Health-based violations

Since October 2016

Violation data reflects EPA records through March 2026. For the most current status, visit the EPA ECHO database.

Contaminant Rule family Start date Status Acute
LEAD AND COPPER RULE REVISIONS
Treatment technique failure
 350 Oct 17, 2024 Resolved No

Monitoring and reporting issues

Since October 2016

Missed tests or reports, not contaminants found above a limit.

Issue Start date Status
Lead and Copper Rule
Monitoring and reporting
 Jul 1, 2025 Active
Lead and Copper Rule
Monitoring and reporting
 Jan 1, 2025 Resolved
Fluoride
Monitoring and reporting
 Jan 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
Arsenic
Monitoring and reporting
 Jan 1, 2025 Archived
Violation period ended. EPA no longer counts it toward current compliance, but no fix was formally recorded.
LEAD AND COPPER RULE REVISIONS
RPT
 Oct 17, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Oct 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Sep 1, 2024 Resolved
Revised Total Coliform Rule
Monitoring violation
 Aug 1, 2024 Resolved

What the violations mean

LEAD AND COPPER RULE REVISIONS

1 incident

The system did not complete a treatment step or action that the LEAD AND COPPER RULE REVISIONS requires (a treatment technique violation).

The utility had to notify customers about this violation.

Where the water comes from

Rio Mercado Water draws water from 1 well. It also buys water from City of Tucson.

Buys water from

Annual water quality report

Rio Mercado Water must give its customers an annual water quality report (Consumer Confidence Report) by July 1, with the levels its tests found in the previous year.

Systems serving 500 or fewer people may meet the rule by telling customers the report is available on request, so you may need to ask Rio Mercado Water for a copy.

Find a posted report with EPA's Consumer Confidence Report search

Testing your own water

To test the water at your tap, or a private well this record does not cover, use a laboratory certified for drinking water by Arizona.

Certified drinking water labs by state EPA guidance for private wells