Centennial Homeowner's Association, Inc.
EPA ID: MT0004438 · 115 people served · 1 ZIP code
Throughout five consecutive years of federal water monitoring, Centennial Homeowner's Association, Inc. recorded zero violations — solid performance for a utility serving 115 people.
Data: EPA SDWIS Last verified: 2026-04-02
Service Area Map
Coverage area for Centennial Homeowner's Association, Inc. Source: EPA SDWIS service area boundaries.
Service area boundary
Service Area Demographics
The Centennial Homeowner's Association, Inc. serves a community with a median household income of $82,265 and an estimated 5,798 residents across its service area.
Environmental Justice Note: 60% 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?
Centennial Homeowner's Association, Inc.'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 Ravalli 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
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
Centennial Homeowner's Association, Inc. (EPA ID: MT0004438) is a community water system in Montana that serves approximately 115 people from groundwater sources.
This system serves ZIP code 59828 in Corvallis.
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
- 59828 — Corvallis
Data Sources
This report uses public data from the EPA Safe Drinking Water Information System (SDWIS). View the full compliance record for Centennial Homeowner's Association, Inc. (MT0004438) on EPA.gov.
Frequently Asked Questions
Is Centennial Homeowner's Association, Inc. water safe to drink?
Based on EPA records, Centennial Homeowner's Association, Inc. has no recorded violations in the past 5 years — a positive indicator of water quality management.
How many people does Centennial Homeowner's Association, Inc. serve?
Centennial Homeowner's Association, Inc. serves approximately 115 people across 1 ZIP code in Montana.
Where does Centennial Homeowner's Association, Inc. 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.