SAN LUIS CITY OF Water Quality Report
Population
39,705
people served
Water Source
🏔️ Ground
wells & aquifers
National Rank
Top 94%
of 49,184 US systems
5-Year Record
⚠️ 11
violations recorded
D
Poor
Safety Grade
11 violations in the past 5 years, including 3 health-based
System Details
- PWSID
- AZ0414005
- Population Served
- 39,705
- Water Source
- Ground Water
- Owner
- Local Government
- State
- Arizona
- EPA Region
- 9
Contaminants of Concern
| Contaminant | Status | Violations |
|---|---|---|
| Contaminant 7000 | ⚠ Monitoring/Reporting | 14 |
| Contaminant 5000 | ⚠ Monitoring/Reporting | 8 |
| Total Coliform | ⚠ Monitoring/Reporting | 4 |
| Contaminant 8000 | ⚠ Monitoring/Reporting | 5 |
| Total Trihalomethanes (TTHMs) | ⚠ Monitoring/Reporting | 1 |
| Contaminant 0700 | ✕ Health-Based | 3 |
Violation History
2024
4
2021
7
2019
2
2017
1
2015
2
2014
1
2013
2
2011
2
2010
2
2009
1
Total violations on record: 35
Service Area
Cities Served
ZIP Codes Served
Recommended Water Filters
Based on contaminants detected in this water system:
Activated Carbon Filter
Effective for chlorine, THMs, pesticides, and taste/odor improvement
Removes: Total Trihalomethanes (TTHMs)
UV Water Purifier
Kills bacteria and viruses without chemicals
Removes: Total Coliform
How does this compare?
This systemNational average
Grade D
Avg: B-C
35violations total
125% of national average
National avg: ~28 per system
📍 Mid-to-large system — serves 6× the national average.