Monticello Water Supply
EPA ID: IA5343098 · 4,040 people served · 2 ZIP codes
In the most recent EPA reporting cycle, Monticello Water Supply carried 108 violations still marked as unresolved — each remains active in the federal enforcement ledger while the utility continues operations for its service population of approximately 4,040 people across the area it supplies.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Monticello Water Supply Source: EPA SDWIS service area boundaries.
Service area boundary — Grade C
Service Area Demographics
The Monticello Water Supply serves a community with a median household income of $76,946 and an estimated 6,533 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.
💧 Where Does Your Water Come From?
Monticello Water Supply'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 Jones County, Iowa rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
Wastewater Proximity Note: This service area ranks in the 70th percentile nationally for proximity to wastewater discharge points.
Infrastructure Risk
Detected Contaminants
How Monticello Water Supply compares to EPA limits
What This Means For You
Lead at 41 mg/L (action level) exceeds the EPA maximum of 0.015 mg/L (action level). Brain damage in children, kidney & blood pressure in adults. Consider reverse osmosis filtration.
Consumer Confidence Report Rule at 37 mg/L exceeds the EPA maximum of mg/L.
Lead and Copper Rule at 26 mg/L exceeds the EPA maximum of mg/L.
Total Trihalomethanes (TTHM) at 1 mg/L exceeds the EPA maximum of 0.08 mg/L. Bladder & rectal cancer risk; reproductive concerns. Consider granular activated carbon (GAC) filtration.
Surface Water Treatment Rule at 4 mg/L exceeds the EPA maximum of mg/L.
Lead was detected in this water system. reverse osmosis filtration can reduce exposure.
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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
MONTICELLO WATER SUPPLY (EPA ID: IA5343098) is a community water system in Iowa that serves approximately 4,040 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: C (59/100)
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 |
|---|---|---|---|
| September 1, 2025 | Lead | Monitoring | Unresolved |
| September 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| August 1, 2025 | Lead | Monitoring | Unresolved |
| August 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| July 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| July 1, 2025 | Lead | Monitoring | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Unresolved |
| June 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| June 1, 2025 | Lead | Monitoring | Unresolved |
| May 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| May 1, 2025 | Lead | Monitoring | Unresolved |
| April 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| April 1, 2025 | Lead | Monitoring | Unresolved |
| March 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| March 1, 2025 | Lead | Monitoring | Unresolved |
| February 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| February 1, 2025 | Lead | Monitoring | Unresolved |
| January 1, 2025 | Consumer Confidence Report Rule | Monitoring | Unresolved |
| January 1, 2025 | Lead | Monitoring | Unresolved |
| December 1, 2024 | Lead | Monitoring | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Lead | Inorganic | 41 | No |
| Consumer Confidence Report Rule | Reporting Failure | 37 | No |
| Lead and Copper Rule | Treatment Failure | 26 | No |
| Surface Water Treatment Rule | Treatment Failure | 4 | No |
| Stage 1 DBP Rule | Treatment Failure | 2 | No |
| Contaminant 1052 | Other Violation | 1 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Total Coliform | Microbiological | 1 | No |
| Contaminant 0700 | Other Violation | 1 | Yes |
Lead & Copper
EPA Lead and Copper Rule sampling data for ZIP codes served by this system:
| ZIP Code | Lead Level | Exceeds Limit | Sample Date |
|---|---|---|---|
| 52310 | 0.003 mg/L | No | N/A |
Radon Risk in Service Area
Dominant radon zone for ZIP codes served by this system: Zone 1 (High 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: 1 ZIP code confirmed via EPA Community Water System Service Area Boundaries v3 plus 1 additional ZIP inferred from SDWIS registry data. The EPA-confirmed set is the most reliable; SDWIS-inferred entries may be narrower than the real deployment area.
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Monticello Water Supply (IA5343098) on EPA.gov.
Frequently Asked Questions
Is Monticello Water Supply water safe to drink?
Monticello Water Supply has recorded 1 health-based violation 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 Monticello Water Supply serve?
Monticello Water Supply serves approximately 4,040 people across 2 ZIP codes in Iowa.
Where does Monticello Water Supply 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 →
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
Monticello Water Supply (EPA ID: IA5343098) — request the latest Consumer Confidence Report or ask about specific contaminants.