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F0/100

SAN LUIS CITY OF — Water Quality Report 2026

Serving 39,705 people · Arizona

Water Source
Groundwater
County
—
System ID
AZ0414005
Violations
627

Contaminant Test Results

2 contaminants above EPA health goals
ContaminantDetectedLimit (MCL)Status
strontium
1900.00 µg/L—Above Goal
Lead (90th percentile)
0.001 mg/L0.015 mg/LAbove Goal

EPA Violation History

8

Violations (last 5yr)

0

Unresolved

2

Health-Related

TIER 3Resolved

Failed to issue ongoing public notification

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

When: October 1, 2024 – November 1, 2024Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Violation related to Consumer Confidence Report

When: June 6, 2024 – December 30, 2024Rule: Consumer Confidence RuleEnforcement: 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: February 1, 2024 – March 19, 2024Rule: Total Coliform RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Monitoring / Reporting Violation

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

When: September 28, 2021 – January 31, 2022Rule: Ground Water RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed to conduct Level 2 Assessment

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

When: September 8, 2021 – March 7, 2022Rule: Stage 2 DBPREnforcement: Resolving — corrective action underway
TIER 3Resolved

Failed to conduct Level 1 Assessment

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

When: September 1, 2021 – July 5, 2022Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 2Resolved

Violation related to Consumer Confidence Report

When: August 5, 2021 – November 12, 2021Rule: Consumer Confidence RuleEnforcement: Resolving — corrective action underway
TIER 3Resolved

Other Violation

When: August 1, 2021 – October 28, 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 SAN LUIS CITY OF

Is SAN LUIS CITY OF water safe to drink?

SAN LUIS CITY OF water receives a grade of F (0/100), which is considered failing. 0 contaminant(s) exceed EPA legal limits and 627 violation(s) are on record. Customers may want to consider using a water filter.

What contaminants has SAN LUIS CITY OF detected?

66 contaminants were tested in SAN LUIS CITY OF's water. Notable contaminants include Lead (90th percentile), strontium. No contaminants exceed EPA legal limits. 2 exceed EPA health goals (MCLGs).

Does SAN LUIS CITY OF have any EPA violations?

Yes, SAN LUIS CITY OF has 627 EPA violation(s) on record, with the most recent in 2024. Violation types include MR, TT, RPT. 8 are health-based violations.

How many people does SAN LUIS CITY OF serve?

SAN LUIS CITY OF serves approximately 39,705 people, Arizona. The system provides water to 1 community: San Luis.

What type of water does SAN LUIS CITY OF provide?

SAN LUIS CITY OF sources its water from groundwater. Groundwater is pumped from underground aquifers, which often provides natural filtration. The utility's system ID is AZ0414005.

How does SAN LUIS CITY OF compare to other utilities in Arizona?

SAN LUIS CITY OF 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

San Luis