City of Lewistown
EPA ID: MT0000271 · 5,923 people served · 2 ZIP codes
The EPA enforcement database lists 21 active violations for City of Lewistown — a provider that delivers drinking water to approximately 5,923 people and has not yet formally resolved those findings.
Data: EPA SDWIS Last verified: 2026-04-02
Compliance Trajectory
Worsening · Risk tier: High · 95% chance of violation in next 12 months
Violations went from 3 (2022) to 4 (2025). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for City of Lewistown Source: EPA SDWIS service area boundaries.
Service area boundary — Grade D
Service Area Demographics
The City of Lewistown serves a community with a median household income of $58,341 and an estimated 9,335 residents across its service area. Approximately 53% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
City of Lewistown'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 Fergus County, Montana 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 Lewistown compares to EPA limits
What This Means For You
Arsenic at 20 mg/L exceeds the EPA maximum of 0.01 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.
Consumer Confidence Report Rule at 3 mg/L exceeds the EPA maximum of mg/L.
Surface Water Treatment Rule at 2 mg/L exceeds the EPA maximum of mg/L.
Stage 1 DBP Rule at 1 mg/L exceeds the EPA maximum of mg/L.
Total Trihalomethanes (TTHM) 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
LEWISTOWN CITY OF (EPA ID: MT0000271) is a community water system in Montana that serves approximately 5,923 people from groundwater sources.
This system provides water to 2 ZIP codes across 2 communities.
Average Home Safety Score: D (40/100)
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 |
|---|---|---|---|
| October 1, 2025 | Arsenic | Health-based | Unresolved |
| July 1, 2025 | Surface Water Treatment Rule | Monitoring | Resolved |
| July 1, 2025 | Arsenic | Health-based | Unresolved |
| April 1, 2025 | Arsenic | Health-based | Unresolved |
| January 1, 2025 | Total Trihalomethanes (TTHM) | Monitoring | Unresolved |
| January 1, 2025 | Arsenic | Health-based | Unresolved |
| December 30, 2024 | Stage 1 DBP Rule | Monitoring | Unresolved |
| October 1, 2024 | Arsenic | Health-based | Unresolved |
| September 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| July 1, 2024 | Arsenic | Health-based | Unresolved |
| June 1, 2024 | Consumer Confidence Report Rule | Monitoring | Resolved |
| April 1, 2024 | Arsenic | Health-based | Unresolved |
| January 1, 2024 | Arsenic | Health-based | Unresolved |
| October 1, 2023 | Arsenic | Monitoring | Resolved |
| October 1, 2023 | Arsenic | Health-based | Unresolved |
| July 1, 2023 | Arsenic | Health-based | Unresolved |
| April 1, 2023 | Arsenic | Health-based | Unresolved |
| January 1, 2023 | Arsenic | Health-based | Unresolved |
Contaminants Detected
The following contaminants have been flagged in EPA records for this water system:
| Contaminant | Category | Violations | Health-Based |
|---|---|---|---|
| Arsenic | Inorganic | 20 | Yes |
| Consumer Confidence Report Rule | Reporting Failure | 3 | No |
| Surface Water Treatment Rule | Treatment Failure | 2 | No |
| Total Trihalomethanes (TTHM) | Disinfection Byproducts | 1 | No |
| Stage 1 DBP Rule | Treatment Failure | 1 | 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 |
|---|---|---|---|
| 59457 | 0.005 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 City of Lewistown (MT0000271) on EPA.gov.
Frequently Asked Questions
Is City of Lewistown water safe to drink?
City of Lewistown has recorded 19 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 Lewistown serve?
City of Lewistown serves approximately 5,923 people across 2 ZIP codes in Montana.
Where does City of Lewistown get its water?
The primary water source is groundwater.
Contact Your Water Utility
Public-record contact information for the water utility serving this system. Use these channels to request water quality reports, ask about service, or report issues directly.
Contact information from LEWISTOWN CITY OF Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility, does not act as its agent, and does not provide customer support for it. Contact details shown are public-record information from CCR filings. For service issues, contact the utility directly using the information above.
Water Source & Treatment
Where this water originates and how it's treated before reaching your tap.
Source: LEWISTOWN CITY OF Consumer Confidence Report.
ZipCheckup is not affiliated with this water utility. Treatment and source data are sourced from the utility's published CCR filings.
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.
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
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 Lewistown (EPA ID: MT0000271) — request the latest Consumer Confidence Report or ask about specific contaminants.