Public water system · MD1150051
ActiveGlenstone Foundation
At a glance
Glenstone Foundation (PWSID MD1150051) is an active non-transient non-community water system in Montgomery County, Maryland. It reports serving 537 people through 1 service connection. Its primary water source is groundwater, and EPA lists it as privately owned. EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2021.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
537
Service connections
1
Primary source
GW
Groundwater
System type
NTNCWS
Non-transient non-community water system
System record
How does Glenstone Foundation compare with other water systems in Montgomery County?
By EPA's size categories, Glenstone Foundation is a small system (501 to 3,300 people). Montgomery County has 49 active public water systems, and Glenstone Foundation is the 5th-largest of them by population served. Its population served is well below the county average of 39,103 people per system, and accounts for less than 0.1% of the 1,916,066 people reported by systems filed under the county. Across Maryland, the 2,992 active systems average 1,947 people each. Nationally, the average active non-transient non-community water system reports serving 430 people, so Glenstone Foundation is about 25% above 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. Maryland has 491 active non-transient non-community water systems, 16% of the state's 2,992 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 2,870 Maryland systems (96%) list groundwater as their primary source.
Who owns and regulates Glenstone Foundation?
EPA lists Glenstone Foundation as privately owned. The MD state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 40 of the 49 active systems in Montgomery County (82%) are also privately owned.
Does Glenstone Foundation have drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2021. The violations listed here began between January 2020 and January 2021. By type: 2 monitoring and 1 monitoring and reporting. The contaminant or rule involved most often is Revised Total Coliform Rule (2 of them). EPA lists 2 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 |
|---|---|---|---|---|
| 2021-01-01 | Monitoring and reportingMonitoring, Regular · code 03 | Nitratecode 1040 | No | Resolved |
| 2020-10-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Archived |
| 2020-01-01 | MonitoringMonitoring, Routine (RTCR) · code 3A | Revised Total Coliform Rulecode 8000 | No | Resolved |
All 3 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.
Glenstone Foundation: frequently asked questions
Who runs Glenstone Foundation?
Glenstone Foundation (PWSID MD1150051) is a non-transient non-community water system privately owned. It is regulated by the MD state drinking water program.
How many people does Glenstone Foundation serve?
Glenstone Foundation reports serving 537 people through 1 service connection in Montgomery County, Maryland.
Where does Glenstone Foundation 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 Glenstone Foundation have any drinking water violations?
EPA's records list 3 violations for this system; none is health-based, and the most recent began in January 2021. 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 Glenstone Foundation'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 3 violations for this system; none is health-based, and the most recent began in January 2021. For current results, consult EPA ECHO, or the MD state drinking water program.
Where can I find Glenstone Foundation's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. Glenstone Foundation 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 Montgomery County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Washington Suburban Sanitary Commission | Montgomery | 1,900,000 | Community | Surface water |
| Town of Poolesville | Montgomery | 6,005 | Community | Groundwater under influence of surface water |
| Adventist Healthcare Shady Grove Med Ctr | Montgomery | 2,100 | Non-transient non-community | Purchased surface water |
| National Institutes of Health | Montgomery | 1,100 | Non-transient non-community | Purchased surface water |
| Dickerson Market | Montgomery | 510 | Transient non-community | Groundwater |
| Darnestown Swim and Raquet Club | Montgomery | 470 | 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, “Glenstone Foundation, PWSID MD1150051, Maryland”, https://aquacensus.com/water-systems/maryland/glenstone-foundation-md1150051 (data as of October 1, 2026).