Lago Del Oro Water Company
EPA ID: AZ0411117 · 18,132 people served · 3 ZIP codes
ZipCheckup's reading of EPA SDWIS for Lago Del Oro Water Company (AZ0411117): 7 EPA violations in the last five years. Lago Del Oro Water Company's record shows 7 remedied violations - all cleared, currently compliant, 18,132 residents.
Data: EPA SDWIS
Service Area Map
Coverage area for Lago Del Oro Water Company Source: EPA SDWIS service area boundaries.
Service area boundary - Grade B
Service Area Demographics
The Lago Del Oro Water Company serves a community with a median household income of $95,838 and an estimated 41,722 residents across its service area.
Environmental Justice Note: 39% 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?
Lago Del Oro Water Company'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.
Infrastructure Risk
Detected Contaminants
How Lago Del Oro Water Company compares to EPA limits
What This Means For You
Gross Alpha at 1 pCi/L exceeds the EPA maximum of pCi/L. Increased cancer risk from radioactive particles. Consider reverse osmosis filtration.
Radium-226 at 1 pCi/L (combined Radium-226 & 228 ≤ 5 pCi/L) exceeds the EPA maximum of pCi/L (combined Radium-226 & 228 ≤ 5 pCi/L). Bone cancer and leukemia (known carcinogen). Consider ion exchange (water softener) filtration.
Radium-228 at 1 pCi/L (combined Radium-226 & 228 ≤ 5 pCi/L) exceeds the EPA maximum of pCi/L (combined Radium-226 & 228 ≤ 5 pCi/L). Bone cancer and leukemia (known carcinogen). Consider ion exchange (water softener) filtration.
Consumer Confidence Report Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Revised Total Coliform Rule at 1 presence exceeds the EPA maximum of presence.
PFAS Detected in Service Area
PFAS ("forever chemicals") have been detected in water serving this system's area. 4 detections recorded.
Gross Alpha was detected in this water system. reverse osmosis 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
Lago Del Oro Water Company (EPA ID: AZ0411117) is a community water system in Arizona that serves approximately 18,132 people from groundwater sources.
This system provides water to 3 ZIP codes across 2 communities.
ZIP-Area Home Safety Context: B (71/100)
This is the average Home Safety Score for 1 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: 7 resolved, 0 archived, 0 addressed, and 0 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 |
|---|---|---|---|
| July 1, 2025 | Gross Alpha | Non-health-based | Resolved |
| July 1, 2025 | Combined Radium | Non-health-based | Resolved |
| July 1, 2025 | Gross Beta | Non-health-based | Resolved |
| July 1, 2025 | Radium-226 | Non-health-based | Resolved |
| July 1, 2025 | Radium-228 | Non-health-based | Resolved |
| January 1, 2022 | Revised Total Coliform Rule | Non-health-based | Resolved |
| May 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 |
|---|---|---|---|
| Gross Alpha | Radionuclides | 1 | No |
| Combined Radium | Radionuclides | 1 | No |
| Gross Beta | Radionuclides | 1 | No |
| Radium-226 | Radionuclides | 1 | No |
| Radium-228 | Radionuclides | 1 | No |
| Consumer Confidence Report Rule | Reporting Failure | 1 | No |
| Revised Total Coliform Rule | 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 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 Lago Del Oro Water Company (AZ0411117) on EPA.gov.
Frequently Asked Questions
Is Lago Del Oro Water Company water safe to drink?
The accepted 2026Q2 ECHO snapshot shows no current noncompliance for Lago Del Oro Water Company; its 7 accepted 2021-2026 records are resolved or archived. Historical compliance status does not establish conditions at a specific tap.
How many people does Lago Del Oro Water Company serve?
Lago Del Oro Water Company serves approximately 18,132 people across 3 ZIP codes in Arizona.
Where does Lago Del Oro Water Company get its water?
The primary water source is groundwater.
Federal UCMR5 PFAS Monitoring: Detected
This water system was tested under the federal EPA Unregulated Contaminant Monitoring Rule (UCMR5). PFAS compounds were detected below the current state-enforceable MCL.
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 →
Frequently Asked Questions
How to cite this page
ZipCheckup. (n.d.). Lago Del Oro Water Company (AZ): 7 EPA Violations. https://zipcheckup.com/water-system/az0411117/
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What You Can Do
Test your water
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Check your specific ZIP code
Water quality can vary within a system. View nearest ZIP report →
Contact your utility
Lago Del Oro Water Company (EPA ID: AZ0411117) - request the latest Consumer Confidence Report or ask about specific contaminants.