Public water system · ME0000640
ActiveRsu 40 Union Elementary-Middle School
At a glance
Rsu 40 Union Elementary-Middle School (PWSID ME0000640) is an active non-transient non-community water system in Knox County, Maine. It reports serving 180 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by a local government. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in January 2016.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
180
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Rsu 40 Union Elementary-Middle School compare with other water systems in Knox County?
By EPA's size categories, Rsu 40 Union Elementary-Middle School is a very small system (500 people or fewer). Knox County has 46 active public water systems. Its population served is well below the county average of 666 people per system, and accounts for 0.6% of the 30,632 people reported by systems filed under the county. Across Maine, the 1,862 active systems average 503 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Rsu 40 Union Elementary-Middle School is about 58% below that figure.
What does “non-transient non-community water system” mean?
A non-transient non-community water system regularly serves at least 25 of the same people for more than six months a year, but not where they live. Schools, factories, office buildings and hospitals with their own supply are typical examples. Maine has 385 active non-transient non-community water systems, 21% of the state's 1,862 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 1,780 Maine systems (96%) list groundwater as their primary source.
Who owns and regulates Rsu 40 Union Elementary-Middle School?
EPA lists Rsu 40 Union Elementary-Middle School as owned by a local government. The ME state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 9 of the 46 active systems in Knox County (20%) are also owned by a local government.
Does Rsu 40 Union Elementary-Middle School have drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in January 2016. The violations listed here began between June 2002 and January 2016. By type: 6 monitoring and reporting, 4 contaminant level above the legal limit and 2 public notice, recordkeeping or other. The contaminant or rule involved most often is Total coliform bacteria (TCR) (9 of them). EPA lists 12 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 |
|---|---|---|---|---|
| 2016-01-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2006-08-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2005-04-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-03-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-02-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
| 2005-01-01 | Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52 | Lead and Copper Rulecode 5000 | No | Resolved |
| 2004-12-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2003-02-28 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2003-01-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-10-26 | Public notice, recordkeeping or otherPublic Notification Violation for NPDWR Violation · code 75 | Public Noticecode 7500 | No | Resolved |
| 2002-09-01 | Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22 | Total coliform bacteria (TCR)code 3100 | Yes | Resolved |
| 2002-06-01 | Monitoring and reportingMonitoring, Routine Major (TCR) · code 23 | Total coliform bacteria (TCR)code 3100 | No | Resolved |
The 12 most recent 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.
Rsu 40 Union Elementary-Middle School: frequently asked questions
Who runs Rsu 40 Union Elementary-Middle School?
Rsu 40 Union Elementary-Middle School (PWSID ME0000640) is a non-transient non-community water system owned by a local government. It is regulated by the ME state drinking water program.
How many people does Rsu 40 Union Elementary-Middle School serve?
Rsu 40 Union Elementary-Middle School reports serving 180 people through 1 service connection in Knox County, Maine.
Where does Rsu 40 Union Elementary-Middle School 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 Rsu 40 Union Elementary-Middle School have any drinking water violations?
Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in January 2016. 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 Rsu 40 Union Elementary-Middle School'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. Of the 12 most recent violations in EPA's records, 4 are health-based, and the most recent began in January 2016. For current results, consult EPA ECHO, or the ME state drinking water program.
Where can I find Rsu 40 Union Elementary-Middle School's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Rsu 40 Union Elementary-Middle School is a non-transient non-community water system, so it is not required to publish one; like every public water system, it must notify the people it serves about violations under EPA's public notification rules.
Other water systems in Knox County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Maine Water Company Camden & Rockland | Knox | 21,315 | Community | Surface water |
| Mdoc State Park-Camden Hills | Knox | 1,573 | Transient non-community | Groundwater |
| Vinalhaven Water District | Knox | 1,053 | Community | Surface water |
| Maine Water Company Warren Division | Knox | 815 | Community | Groundwater |
| North Haven Water Department | Knox | 740 | Community | Surface water |
| Tenants Harbor Water District | Knox | 378 | Community | Groundwater |
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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, “Rsu 40 Union Elementary-Middle School, PWSID ME0000640, Maine”, https://aquacensus.com/water-systems/maine/rsu-40-union-elementary-middle-school-me0000640 (data as of October 1, 2026).