Public water system · CT1615113

Active

The Grumman Hill Montessori Association

At a glance

The Grumman Hill Montessori Association (PWSID CT1615113) is an active non-transient non-community water system in Fairfield County, Connecticut. It reports serving 259 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 2026.

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

Population served

259

Service connections

Primary source

Groundwater

System type

NTNCWS

Non-transient non-community water system

System record

PWSIDCT1615113

System typeNon-transient non-community water system

Activity statusActive

Population served259

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyCT state drinking water program

City servedWilton

StateConnecticut

ZIP—

CountyFairfield County

How does The Grumman Hill Montessori Association compare with other water systems in Fairfield County?

By EPA's size categories, The Grumman Hill Montessori Association is a very small system (500 people or fewer). Fairfield County has 337 active public water systems. Its population served is well below the county average of 2,311 people per system, and accounts for less than 0.1% of the 778,730 people reported by systems filed under the county. Across Connecticut, the 2,363 active systems average 1,247 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so The Grumman Hill Montessori Association is about 40% 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. Connecticut has 483 active non-transient non-community water systems, 20% of the state's 2,363 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,263 Connecticut systems (96%) list groundwater as their primary source.

Who owns and regulates The Grumman Hill Montessori Association?

EPA lists The Grumman Hill Montessori Association as privately owned. The CT state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 286 of the 337 active systems in Fairfield County (85%) are also privately owned.

Does The Grumman Hill Montessori Association have drinking water violations?

Of the 12 most recent violations in EPA's records, 2 are health-based, and the most recent began in January 2026. The violations listed here began between August 2013 and January 2026. By type: 10 monitoring and reporting and 2 required treatment not met. The contaminant or rule involved most often is Lead and Copper Rule (12 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
2026-01-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2022-07-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2019-07-01	Monitoring and reportingFollow-up Or Routine LCR Tap M/R · code 52	Lead and Copper Rulecode 5000	No	Resolved
2017-04-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2016-09-29	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2016-03-09	Required treatment not metOCCT/SOWT Study/Recommendation · code 57	Lead and Copper Rulecode 5000	Yes	Resolved
2016-03-09	Required treatment not metPublic Education · code 65	Lead and Copper Rulecode 5000	Yes	Resolved
2015-09-29	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2015-04-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2014-09-29	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2014-04-01	Monitoring and reportingLead Consumer Notice · code 66	Lead and Copper Rulecode 5000	No	Resolved
2013-08-01	Monitoring and reportingInitial, Follow-up, or Routine Source Water M/R · code 56	Lead and Copper Rulecode 5000	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.

The Grumman Hill Montessori Association: frequently asked questions

Who runs The Grumman Hill Montessori Association?

The Grumman Hill Montessori Association (PWSID CT1615113) is a non-transient non-community water system privately owned. It is regulated by the CT state drinking water program.

How many people does The Grumman Hill Montessori Association serve?

The Grumman Hill Montessori Association reports serving 259 people through 1 service connection in Fairfield County, Connecticut.

Where does The Grumman Hill Montessori Association 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 The Grumman Hill Montessori Association have any drinking water violations?

Of the 12 most recent violations in EPA's records, 2 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 The Grumman Hill Montessori Association'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, 2 are health-based, and the most recent began in January 2026. For current results, consult EPA ECHO, or the CT state drinking water program.

Where can I find The Grumman Hill Montessori Association's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. The Grumman Hill Montessori Association 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 Fairfield County

Water system	County	Population served	Type	Source
Aquarion-Eastern Fairfield County	Fairfield	351,756	Community	Surface water
Aquarion-Stamford	Fairfield	119,214	Community	Surface water
Danbury Water Department	Fairfield	62,055	Community	Surface water
Aquarion-Greenwich	Fairfield	53,297	Community	Surface water
South Norwalk Electric & Water	Fairfield	42,000	Community	Surface water
Norwalk First Taxing District	Fairfield	40,256	Community	Surface water

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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, “The Grumman Hill Montessori Association, PWSID CT1615113, Connecticut”, https://aquacensus.com/water-systems/connecticut/the-grumman-hill-montessori-association-ct1615113 (data as of October 1, 2026).