Public water system · MT0004438
ActiveCentennial Homeowner'S Association, Inc.
At a glance
Centennial Homeowner'S Association, Inc. (PWSID MT0004438) is an active community water system in Ravalli County, Montana. It reports serving 115 people through 46 service connections. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 6 violations for this system; 3 are health-based, and the most recent began in November 2010.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
115
Service connections
46
Primary source
GW
Groundwater
System type
CWS
Community water system
System record
How does Centennial Homeowner'S Association, Inc. compare with other water systems in Ravalli County?
By EPA's size categories, Centennial Homeowner'S Association, Inc. is a very small system (500 people or fewer). Ravalli County has 130 active public water systems. Its population served is about half of the county average of 237 people per system, and accounts for 0.4% of the 30,805 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active community water system reports serving 6,703 people, so Centennial Homeowner'S Association, Inc. is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. Montana has 853 active community water systems, 36% of the state's 2,378 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,994 Montana systems (84%) list groundwater as their primary source.
Who owns and regulates Centennial Homeowner'S Association, Inc.?
EPA lists Centennial Homeowner'S Association, Inc. as privately owned. The MT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 112 of the 130 active systems in Ravalli County (86%) are also privately owned.
Does Centennial Homeowner'S Association, Inc. have drinking water violations?
EPA's records list 6 violations for this system; 3 are health-based, and the most recent began in November 2010. The violations listed here began between July 2007 and November 2010. By type: 3 contaminant level above the legal limit and 3 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (4 of them). EPA lists 6 as resolved. Resolved means at least one resolving action is on record: the system returned to compliance, the rule no longer applies, or no further action was needed.
| Began | Violation | Contaminant or rule | Health-based | Status |
|---|---|---|---|---|
| 2010-11-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2010-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2008-10-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2007-11-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Combined Radium (-226 and -228)code 4010 | No | Resolved |
| 2007-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Gross alpha (excluding radon and uranium)code 4000 | No | Resolved |
All 6 violations in EPA's records, newest first.Labels and codes come from EPA's SDWIS reference tables. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found. "Health-based" marks violations of a legal limit or required treatment.
Centennial Homeowner'S Association, Inc.: frequently asked questions
Who runs Centennial Homeowner'S Association, Inc.?
Centennial Homeowner'S Association, Inc. (PWSID MT0004438) is a community water system privately owned. It is regulated by the MT state drinking water program.
How many people does Centennial Homeowner'S Association, Inc. serve?
Centennial Homeowner'S Association, Inc. reports serving 115 people through 46 service connections in Ravalli County, Montana.
Where does Centennial Homeowner'S Association, Inc. get its water?
EPA SDWIS lists this system's primary water source as groundwater. Groundwater means the system draws its water from wells or springs fed by underground aquifers.
Does Centennial Homeowner'S Association, Inc. have any drinking water violations?
EPA's records list 6 violations for this system; 3 are health-based, and the most recent began in November 2010. A monitoring or reporting violation means a required test or report was missed or late; it does not by itself mean a contaminant was found.
Is Centennial Homeowner'S Association, Inc.'s water safe to drink?
AquaCensus shows EPA compliance records, not current water test results, so it cannot say whether the water is safe at a given moment. EPA's records list 6 violations for this system; 3 are health-based, and the most recent began in November 2010. For current results, consult the system's annual water quality report, EPA ECHO, or the MT state drinking water program.
Where can I find Centennial Homeowner'S Association, Inc.'s water quality report?
As a community water system, Centennial Homeowner'S Association, Inc. must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Ravalli County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Hamilton City of | Ravalli | 5,660 | Community | Groundwater |
| Stevensville Town of | Ravalli | 2,090 | Community | Groundwater |
| Super One Food Store | Ravalli | 1,769 | Non-transient non-community | Groundwater |
| Town Pump Woodside 1 | Ravalli | 1,198 | Transient non-community | Groundwater |
| Town Pump Florence 1 | Ravalli | 1,092 | Transient non-community | Groundwater |
| Florence Carlton School | Ravalli | 1,025 | Non-transient non-community | Groundwater |
Related pages
Working with water-system records? Pro adds alerts, change history and CSV export ($49/mo); Enterprise adds full national files, the API and an MCP server for AI tools.
About this data
Source: U.S. EPA Safe Drinking Water Information System (SDWIS) and SDWA violation records, via EPA ECHO, as published October 1, 2026 — AquaCensus refreshes it quarterly. See the methodology for how records are matched, cleaned and scored.
Cite as: AquaCensus, “Centennial Homeowner'S Association, Inc., PWSID MT0004438, Montana”, https://aquacensus.com/water-systems/montana/centennial-homeowner-s-association-inc-mt0004438 (data as of October 1, 2026).