Mission Mountain Lake Company W and S District
EPA ID: MT0003801 · 118 people served · 1 ZIP code
EPA monitoring data for Mission Mountain Lake Company W and S District shows an unblemished five-year compliance history — no violations of any kind have been recorded for this utility, which supplies water to approximately 118 people, covering every reporting cycle without a single MCL exceedance or monitoring lapse.
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 2 (2023) to 1 (2024). The pattern suggests growing compliance challenges.
Service Area Map
Coverage area for Mission Mountain Lake Company W and S District Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Mission Mountain Lake Company W and S District serves a community with a median household income of $60,305 and an estimated 7,399 residents across its service area. Approximately 54% of housing stock was built before 1986, which increases the likelihood of lead service lines and older plumbing.
💧 Where Does Your Water Come From?
Mission Mountain Lake Company W and S District'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 2% of homes in Missoula County, Montana rely on private wells rather than public water systems. Private well owners are responsible for their own water testing and treatment.
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
Comparable Water Systems
Similar-sized systems in Montana
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
Mission Mountain Lake Company W and S District (EPA ID: MT0003801) is a community water system in Montana that serves approximately 118 people from groundwater sources.
This system serves ZIP code 59864 in Ronan.
Violation History
Lead & Copper
No Lead and Copper Rule sampling data available for this water system.
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
- 59864 — Ronan
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Mission Mountain Lake Company W and S District (MT0003801) on EPA.gov.
Frequently Asked Questions
Is Mission Mountain Lake Company W and S District water safe to drink?
Based on EPA records, Mission Mountain Lake Company W and S District has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Mission Mountain Lake Company W and S District serve?
Mission Mountain Lake Company W and S District serves approximately 118 people across 1 ZIP code in Montana.
Where does Mission Mountain Lake Company W and S District 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:
This system reports zero confirmed lead service lines in its inventory. Unknown-material counts may still warrant verification.
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.