Public water system · MT0004680

Active

Alder School

At a glance

Alder School (PWSID MT0004680) is an active non-transient non-community water system in Madison County, Montana. It reports serving 30 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as owned by a state government. EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 2024.

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

Population served

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDMT0004680

System typeNon-transient non-community water system

Activity statusActive

Population served30

Service connections1

Primary water sourceGroundwater

Owner typeState government

Primacy agencyMT state drinking water program

City servedAlder

StateMontana

ZIP—

CountyMadison County

How does Alder School compare with other water systems in Madison County?

By EPA's size categories, Alder School is a very small system (500 people or fewer). Madison County has 45 active public water systems. Its population served is well below the county average of 320 people per system, and accounts for 0.2% of the 14,392 people reported by systems filed under the county. Across Montana, the 2,378 active systems average 489 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Alder School is well 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. Montana has 319 active non-transient non-community water systems, 13% 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 Alder School?

EPA lists Alder School as owned by a state government. 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. 4 of the 45 active systems in Madison County (8.9%) are also owned by a state government.

Does Alder School have drinking water violations?

EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 2024. The violations listed here began between September 2009 and October 2024. By type: 8 monitoring and reporting and 1 public notice, recordkeeping or other. The contaminant or rule involved most often is Lead and Copper Rule (5 of them). EPA lists 8 as resolved and 1 as unaddressed. 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. Unaddressed means the violation is not resolved or archived and is not yet covered by formal enforcement.

Began	Violation	Contaminant or rule	Health-based	Status
2024-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Unaddressed
2021-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2016-04-02	Public notice, recordkeeping or otherSample Siting Plan Errors (RTCR) · code 5A	Revised Total Coliform Rulecode 8000	No	Resolved
2015-12-30	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2012-10-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2010-07-01	Monitoring and reportingInitial Tap Sampling for Pb and Cu · code 51	Lead and Copper Rulecode 5000	No	Resolved
2010-03-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2009-10-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2009-09-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved

All 9 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.

Alder School: frequently asked questions

Who runs Alder School?

Alder School (PWSID MT0004680) is a non-transient non-community water system owned by a state government. It is regulated by the MT state drinking water program.

How many people does Alder School serve?

Alder School reports serving 30 people through 1 service connection in Madison County, Montana.

Where does Alder 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 Alder School have any drinking water violations?

EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 2024. 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 Alder 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. EPA's records list 9 violations for this system; none is health-based, and the most recent began in October 2024. For current results, consult EPA ECHO, or the MT state drinking water program.

Where can I find Alder School's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Alder 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 Madison County

Water system	County	Population served	Type	Source
Big Sky County Water and Sewer Dist 363	Madison	4,132	Community	Groundwater
Virginia City Water Dept	Madison	1,500	Community	Groundwater
Ennis Town of	Madison	1,400	Community	Groundwater
Sheridan Town of	Madison	632	Community	Groundwater
Nevada City	Madison	621	Transient non-community	Groundwater
Earthquake Lake Visitor Center	Madison	503	Transient non-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, “Alder School, PWSID MT0004680, Montana”, https://aquacensus.com/water-systems/montana/alder-school-mt0004680 (data as of October 1, 2026).