Sphinx Mountain Mb Hm Pk
EPA ID: MT0003755 · 52 people served · 1 ZIP code
Five clean years on EPA record — Sphinx Mountain Mb Hm Pk, 52 residents served.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Demographics
The Sphinx Mountain Mb Hm Pk serves a community with a median household income of $49,519 and an estimated 1,181 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?
Sphinx Mountain Mb Hm Pk'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 Park County, Montana 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 80th percentile nationally for proximity to wastewater discharge points.
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
Sphinx Mountain Mb Hm Pk (EPA ID: MT0003755) is a community water system in Montana that serves approximately 52 people from groundwater sources.
This system serves ZIP code 59030 in Gardiner.
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
- 59030 — Gardiner
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Sphinx Mountain Mb Hm Pk (MT0003755) on EPA.gov.
Frequently Asked Questions
Is Sphinx Mountain Mb Hm Pk water safe to drink?
Based on EPA records, Sphinx Mountain Mb Hm Pk has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Sphinx Mountain Mb Hm Pk serve?
Sphinx Mountain Mb Hm Pk serves approximately 52 people across 1 ZIP code in Montana.
Where does Sphinx Mountain Mb Hm Pk 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.