Public water system · ME0009850

Active

Calais High School

At a glance

Calais High School (PWSID ME0009850) is an active non-transient non-community water system in Washington County, Maine. It reports serving 390 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, 6 are health-based, and the most recent began in January 2026.

Dataset updated October 2026 . Source: EPA SDWIS/ECHO public records.

Population served

390

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDME0009850

System typeNon-transient non-community water system

Activity statusActive

Population served390

Service connections1

Primary water sourceGroundwater

Owner typeLocal government

Primacy agencyME state drinking water program

City servedCalais

StateMaine

ZIP—

CountyWashington County

How does Calais High School compare with other water systems in Washington County?

By EPA's size categories, Calais High School is a very small system (500 people or fewer). Washington County has 109 active public water systems. Its population served is about twice the county average of 205 people per system, and accounts for 1.7% of the 22,334 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 Calais High School is roughly in line with 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 Calais High School?

EPA lists Calais High 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. 30 of the 109 active systems in Washington County (28%) are also owned by a local government.

Does Calais High School have drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in January 2026. The violations listed here began between January 1996 and January 2026. By type: 6 contaminant level above the legal limit and 6 monitoring and reporting. The contaminant or rule involved most often is Total coliform bacteria (TCR) (6 of them). EPA lists 11 as resolved and 1 as archived. 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. Archived means the violation was not marked resolved but is more than five years past the end of the noncompliance period, so it no longer counts toward current compliance status.

Began	Violation	Contaminant or rule	Health-based	Status
2026-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, E. coli (RTCR) · code 1A	Revised Total Coliform Rulecode 8000	Yes	Archived
2014-01-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2010-09-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2004-10-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2003-08-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Monthly (TCR) · code 22	Total coliform bacteria (TCR)code 3100	Yes	Resolved
2003-03-01	Contaminant level above the legal limitMaximum Contaminant Level Violation, Acute (TCR) · code 21	Total coliform bacteria (TCR)code 3100	Yes	Resolved
1998-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
1996-01-01	Monitoring and reportingMonitoring, Regular · code 03	Dichloromethanecode 2964	No	Resolved
1996-01-01	Monitoring and reportingMonitoring, Regular · code 03	Xylenes, Totalcode 2955	No	Resolved
1996-01-01	Monitoring and reportingMonitoring, Regular · code 03	1,2-Dichloropropanecode 2983	No	Resolved
1996-01-01	Monitoring and reportingMonitoring, Regular · code 03	Styrenecode 2996	No	Resolved
1996-01-01	Monitoring and reportingMonitoring, Regular · code 03	1,2,4-Trichlorobenzenecode 2378	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.

Calais High School: frequently asked questions

Who runs Calais High School?

Calais High School (PWSID ME0009850) 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 Calais High School serve?

Calais High School reports serving 390 people through 1 service connection in Washington County, Maine.

Where does Calais High 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 Calais High School have any drinking water violations?

Of the 12 most recent violations in EPA's records, 6 are health-based, and the most recent began in January 2026. 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 Calais High 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, 6 are health-based, and the most recent began in January 2026. For current results, consult EPA ECHO, or the ME state drinking water program.

Where can I find Calais High School's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Calais High 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 Washington County

Water system	County	Population served	Type	Source
Calais Water Dept	Washington	2,775	Community	Groundwater
Passamaquoddy Water District	Washington	2,125	Community	Surface water
Lubec Water District	Washington	1,775	Community	Groundwater
Baileyville Utilities District	Washington	1,688	Community	Groundwater
Machias Water Company	Washington	1,390	Community	Groundwater
Indian Township Tribal Water System	Washington	535	Community	Groundwater

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, “Calais High School, PWSID ME0009850, Maine”, https://aquacensus.com/water-systems/maine/calais-high-school-me0009850 (data as of October 1, 2026).