City of Oakley
EPA ID: ID5160035 · 821 people served · 2 ZIP codes
Unlike fully compliant utilities, City of Oakley has 15 outstanding EPA violations for approximately 821 residents.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for City of Oakley Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The City of Oakley serves a community with a median household income of $80,750 and an estimated 1,498 residents across its service area. Approximately 64% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
Environmental Justice Note: 83% 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 Oakley'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.
About 1% of homes in Cassia County, Idaho rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Infrastructure Risk
Detected Contaminants
How City of Oakley compares to EPA limits
What This Means For You
Revised Total Coliform Rule at 10 presence exceeds the EPA maximum of presence.
Consumer Confidence Report Rule at 5 mg/L exceeds the EPA maximum of mg/L.
Contaminant 0700 at 4 mg/L exceeds the EPA maximum of mg/L.
Total Coliform at 3 presence exceeds the EPA maximum of presence.
Stage 1 DBP Rule at 3 mg/L exceeds the EPA maximum of mg/L.
Comparable Water Systems
Similar-sized systems in Idaho
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
OAKLEY CITY OF (EPA ID: ID5160035) is a community water system in Idaho that serves approximately 821 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: C (66/100)
Based on water quality violations, lead levels, and radon risk across all ZIP codes served by this system.
Violation History
Recent Violations
| Date | Contaminant | Type | Status |
|---|---|---|---|
| July 2, 2025 | Stage 2 DBP Rule | Monitoring | Unresolved |
| June 1, 2025 | Revised Total Coliform Rule | Monitoring | Unresolved |
| March 3, 2025 | Lead and Copper Rule | Monitoring | Unresolved |
| December 30, 2024 | Stage 1 DBP Rule | Monitoring | Unresolved |
| December 29, 2024 | Lead and Copper Rule | Monitoring | Resolved |
| December 1, 2024 | Contaminant 0700 | Monitoring | Unresolved |
| December 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| November 28, 2024 | Consumer Confidence Report Rule | Health-based | Resolved |
| November 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| October 31, 2024 | Contaminant 0700 | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Health-based | Resolved |
| October 17, 2024 | Stage 2 DBP Rule | Monitoring | Resolved |
| October 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| October 1, 2024 | Contaminant 0700 | Health-based | Resolved |
| September 1, 2024 | Revised Total Coliform Rule | Monitoring | Resolved |
| June 16, 2024 | Total Coliform | Monitoring | Unresolved |
| March 7, 2024 | Contaminant 0700 | Monitoring | Resolved |
| January 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| January 1, 2024 | Revised Total Coliform Rule | Monitoring | Unresolved |
| September 19, 2023 | Total Coliform | Monitoring | Resolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Revised Total Coliform Rule | Microbiological | 10 | No |
| Consumer Confidence Report Rule | Reporting Failure | 5 | Yes |
| Contaminant 0700 | Other Violation | 4 | Yes |
| Total Coliform | Microbiological | 3 | No |
| Stage 1 DBP Rule | Treatment Failure | 3 | No |
| Stage 2 DBP Rule | Treatment Failure | 3 | Yes |
| Lead and Copper Rule | Treatment Failure | 2 | No |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 83346 | 0.004 mg/L | No | N/A |
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
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for City of Oakley (ID5160035) on EPA.gov.
Frequently Asked Questions
Is City of Oakley water safe to drink?
City of Oakley has recorded 4 health-based violations in the past 5 years. While the system is required to treat water to meet federal standards, you may want to consider additional precautions such as a certified water filter.
How many people does City of Oakley serve?
City of Oakley serves approximately 821 people across 2 ZIP codes in Idaho.
Where does City of Oakley get its water?
The primary water source is groundwater.
Lead Service Line Inventory
Service line breakdown reported under the federal Lead and Copper Rule Improvements (LCRI) inventory requirement:
Federal LCRI rule (effective October 2024) requires every public water system to inventory its service lines and complete lead-line replacement within 10 years.
Source: EPA SDWIS Federal Service Line Inventory (Phase 2) · Submitted 2026
ZipCheckup is not affiliated with the utility or state agency. Inventory figures render verbatim from the public LCRI submission cited above; ZipCheckup does not perform inspections or replacements.
Frequently Asked Questions
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 Oakley (EPA ID: ID5160035) — request the latest Consumer Confidence Report or ask about specific contaminants.