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LAGO DEL ORO WATER COMPANY — Water Quality Report 2026

Serving 18,132 people · Arizona

Water Source
Groundwater
County
—
System ID
AZ0411117
Violations
601

Contaminant Test Results

1 contaminant above EPA health goals
ContaminantDetectedLimit (MCL)Status
chlorate
460.00 µg/L—Above Goal

EPA Violation History

7

Violations (last 5yr)

5

Unresolved

0

Health-Related

TIER 3Unresolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2025 – September 30, 2025Verify on EPA.gov
TIER 3Unresolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2025 – September 30, 2025Verify on EPA.gov
TIER 3Unresolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2025 – September 30, 2025Verify on EPA.gov
TIER 3Unresolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2025 – September 30, 2025Verify on EPA.gov
TIER 3Unresolved

Exceeded the MCL for disinfection byproducts

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: July 1, 2025 – September 30, 2025Verify on EPA.gov
TIER 3Resolved

Failed Level 2 Assessment under Revised Total Coliform Rule

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: January 1, 2022 – March 31, 2022Rule: Stage 1 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring violation

This is a paperwork/process violation — it does not mean a contaminant was detected at unsafe levels.

When: May 1, 2021 – June 29, 2021Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway

Understanding violation severity

Tier 1Urgent health risk. Utility must notify all customers within 24 hours.Tier 2Important health or treatment issue. Customers notified within 30 days.Tier 3Administrative or monitoring issue. Reported in the annual water quality report.

Source: EPA Safe Drinking Water Information System (SDWIS) · Updated quarterly

Frequently Asked Questions About LAGO DEL ORO WATER COMPANY

Is LAGO DEL ORO WATER COMPANY water safe to drink?

LAGO DEL ORO WATER COMPANY water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 601 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has LAGO DEL ORO WATER COMPANY detected?

66 contaminants were tested in LAGO DEL ORO WATER COMPANY's water. Notable contaminants include chlorate. No contaminants exceed EPA legal limits. 1 exceed EPA health goals (MCLGs).

Does LAGO DEL ORO WATER COMPANY have any EPA violations?

Yes, LAGO DEL ORO WATER COMPANY has 601 EPA violation(s) on record, with the most recent in 2025. Violation types include MR, RPT, Other.

How many people does LAGO DEL ORO WATER COMPANY serve?

LAGO DEL ORO WATER COMPANY serves approximately 18,132 people, Arizona. The system provides water to 1 community: Catalina.

What type of water does LAGO DEL ORO WATER COMPANY provide?

LAGO DEL ORO WATER COMPANY sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is AZ0411117.

How does LAGO DEL ORO WATER COMPANY compare to other utilities in Arizona?

LAGO DEL ORO WATER COMPANY scores 0/100 with a grade of F (failing). This score suggests significant water quality concerns relative to other utilities. Visit our Arizona state page for a full comparison of water systems.

Cities Served

Catalina