City of San Luis
EPA ID: AZ0414005 · 39,705 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for City of San Luis (AZ0414005): 1 unresolved EPA violation on record. Not yet resolved: 1 EPA violation at City of San Luis, affecting about 39,705 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for City of San Luis Source: EPA SDWIS service area boundaries.
Service area boundary - Grade B
Service Area Demographics
The City of San Luis serves a community with a median household income of $58,314 and an estimated 55,967 residents across its service area.
Environmental Justice Note: 68% of the population in this service area is classified as disadvantaged under EPA's EJScreen criteria. Communities with higher disadvantaged populations often face disproportionate environmental and health burdens, including aging water infrastructure and limited resources for remediation.
💧 Where Does Your Water Come From?
City of San Luis's water is pumped from underground aquifers. Groundwater is naturally filtered through rock and soil, but it can be vulnerable to PFAS contamination, nitrates from agriculture, and industrial chemicals that seep into the water table.
Superfund Proximity Note: This service area ranks in the 60th percentile nationally for proximity to Superfund (NPL) sites. Groundwater sources near contaminated sites may face elevated risk from industrial chemicals.
Infrastructure Risk
Detected Contaminants
How City of San Luis compares to EPA limits
What This Means For You
Haloacetic Acids (HAA5) at 1 mg/L exceeds the EPA maximum of 0.06 mg/L. Cancer risk; reproductive & developmental effects. Consider granular activated carbon (GAC) filtration.
Consumer Confidence Report Rule at 3 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Contaminant 0700 at 2 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 1 presence exceeds the EPA maximum of presence.
Haloacetic Acids (HAA5) was detected in this water system. granular activated carbon (GAC) filtration can reduce exposure.
Find a certified water filter →Comparable Water Systems
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Estimated Remediation Costs
Average estimated costs across ZIP codes served by this system
Based on national averages for common remediation projects. Actual costs vary by property. Only issues flagged by EPA, FEMA, or state data for each ZIP code are included.
System Overview
City of San Luis (EPA ID: AZ0414005) is a community water system in Arizona that serves approximately 39,705 people from groundwater sources.
This system provides water to 3 ZIP codes across 3 communities.
ZIP-Area Home Safety Context: B (77/100)
This is the average Home Safety Score for 2 of 3 service-area ZIP codes with all required score domains observed. It is not a grade for the water utility.
Model 4.0.0 uses SDWIS identity plus accepted ECHO SDWA lifecycle-based water compliance, the UCMR 5 PFAS MCL screen, EPA radon zone, and annual EPA AirData AQI across three equally weighted domains. Missing required evidence suppresses the score.
Violation History
Status breakdown for accepted records with record years 2021-2026: 8 resolved, 0 archived, 0 addressed, and 1 unaddressed. Under this source contract, current noncompliance is the sum of addressed and unaddressed records. Archived and resolved records are excluded from current noncompliance.
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| October 1, 2024 | Stage 1 DBP Rule | Non-health-based | Resolved |
| June 6, 2024 | Contaminant 0700 | Health-based | Resolved |
| February 1, 2024 | Consumer Confidence Report Rule | Non-health-based | Resolved |
| September 28, 2021 | Stage 1 DBP Rule | Non-health-based | Resolved |
| September 15, 2021 | Consumer Confidence Report Rule | Health-based | Unaddressed (current) |
| September 8, 2021 | Haloacetic Acids (HAA5) | Non-health-based | Resolved |
| September 1, 2021 | Total Coliform | Non-health-based | Resolved |
| August 5, 2021 | Contaminant 0700 | Health-based | Resolved |
| August 1, 2021 | Consumer Confidence Report Rule | Non-health-based | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Consumer Confidence Report Rule | Reporting Failure | 3 | Yes |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Contaminant 0700 | Other Violation | 2 | Yes |
| Haloacetic Acids (HAA5) | Disinfection Byproducts | 1 | No |
| Total Coliform | Microbiological | 1 | No |
Lead & Copper
EPA Lead and Copper Rule evidence attributed directly to this water system:
| Lead Level | Exceeds Action Level | Sample Date |
|---|---|---|
| 0.001 mg/L | No | N/A |
No copper action-level exceedance record appears for this PWSID in the accepted LCR snapshot. This does not establish a clean copper measurement.
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 2 (Moderate Risk)
The EPA recommends testing homes in Zone 1 and Zone 2 areas for radon.
Need help with your water quality?
Typical cost: Water test: typically $20–$50 (DIY kit) · Professional inspection: $150–$400
Find the Right Water FilterFree tip: Let cold water run for 2 minutes before drinking — this helps flush lead from your pipes.
ZIP Codes Served
Coverage: Service area ZIP codes sourced from EPA Community Water System Service Area Boundaries v3 (March 2026 release). These ZIPs reflect the actual deployment footprint recorded by AZ or modeled from parcel and building-footprint data.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of San Luis (AZ0414005) on EPA.gov.
Frequently Asked Questions
Is City of San Luis water safe to drink?
The accepted 2026Q2 ECHO snapshot shows 1 current health-based noncompliance record for City of San Luis. Review the utility's current notices and EPA record. This system-level compliance history cannot determine conditions at a specific tap.
How many people does City of San Luis serve?
City of San Luis serves approximately 39,705 people across 3 ZIP codes in Arizona.
Where does City of San Luis get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Tested Clean
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). No PFAS compounds were detected.
Current MCL reflects the lowest state-enforceable limit (NYS 10 ppt for PFOA/PFOS, effective August 2020). The federal final MCL of 4 ppt for PFOA/PFOS (EPA April 2024 rule) is not enforceable until April 2029. Detections above 4 ppt but below 10 ppt are below current MCL but above the future federal limit.
Source: U.S. EPA UCMR5 (Unregulated Contaminant Monitoring Rule, 5th cycle) — per-system federal sampling, 2023–2025. EPA UCMR5 monitoring program →
How Water Systems Appear in Rankings
Water systems are evaluated by violation history, contaminant detections, and service population. Larger systems with more service connections appear in more rankings.
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). City of San Luis (AZ): 3 Health Violations. https://zipcheckup.com/water-system/az0414005/
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What You Can Do
Test your water
Home test kits can detect lead, bacteria, and other contaminants at your tap. Find the right filter →
Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
City of San Luis (EPA ID: AZ0414005) - request the latest Consumer Confidence Report or ask about specific contaminants.