Public water system · NY5519179
ActiveLake Mohonk Mountain House
At a glance
Lake Mohonk Mountain House (PWSID NY5519179) is an active community water system in Ulster County, New York. It reports serving 880 people through 21 service connections. Its primary water source is groundwater under influence of surface water, and EPA lists it as privately owned. Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2019.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
880
Service connections
21
Primary source
GU
Groundwater under influence of surface water
System type
CWS
Community water system
System record
How does Lake Mohonk Mountain House compare with other water systems in Ulster County?
By EPA's size categories, Lake Mohonk Mountain House is a small system (501 to 3,300 people). Ulster County has 446 active public water systems. Its population served is about 195% above the county average of 298 people per system, and accounts for 0.7% of the 133,020 people reported by systems filed under the county. Across New York, the 8,167 active systems average 2,374 people each. Nationally, the average active community water system reports serving 6,703 people, so Lake Mohonk Mountain House is well below that figure.
What does “community water system” mean?
A community water system serves at least 15 connections used by year-round residents, or regularly serves at least 25 year-round residents. Homes, apartments and mobile-home parks are served by these. New York has 2,281 active community water systems, 28% of the state's 8,167 active systems. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules. 241 New York systems (3%) list groundwater under influence of surface water as their primary source.
Who owns and regulates Lake Mohonk Mountain House?
EPA lists Lake Mohonk Mountain House as privately owned. The NY state drinking water program is its primacy agency, the regulator with primary enforcement responsibility for the system under the Safe Drinking Water Act. 384 of the 446 active systems in Ulster County (86%) are also privately owned.
Does Lake Mohonk Mountain House have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2019. The violations listed here began between April 2019 and April 2019. By type: 12 monitoring and reporting. The contaminants or rules involved are Trichloroethylene, p-Dichlorobenzene, 1,2-Dichloropropane and trans-1,2-Dichloroethylene. 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 |
|---|---|---|---|---|
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloropropanecode 2983 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | trans-1,2-Dichloroethylenecode 2979 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Dichloromethanecode 2964 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | cis-1,2-Dichloroethylenecode 2380 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Chlorobenzenecode 2989 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2-Dichloroethanecode 2980 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Resolved |
| 2019-04-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,2-Trichloroethanecode 2985 | 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.
Lake Mohonk Mountain House: frequently asked questions
Who runs Lake Mohonk Mountain House?
Lake Mohonk Mountain House (PWSID NY5519179) is a community water system privately owned. It is regulated by the NY state drinking water program.
How many people does Lake Mohonk Mountain House serve?
Lake Mohonk Mountain House reports serving 880 people through 21 service connections in Ulster County, New York.
Where does Lake Mohonk Mountain House get its water?
EPA SDWIS lists this system's primary water source as groundwater under influence of surface water. Groundwater under the influence of surface water is well or spring water that the regulator has found to be affected by nearby surface water, so it is regulated under the surface-water treatment rules.
Does Lake Mohonk Mountain House have any drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in April 2019. 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 Lake Mohonk Mountain House'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, none is health-based, and the most recent began in April 2019. For current results, consult the system's annual water quality report, EPA ECHO, or the NY state drinking water program.
Where can I find Lake Mohonk Mountain House's water quality report?
As a community water system, Lake Mohonk Mountain House must deliver an annual water quality report, called a Consumer Confidence Report, to its customers by July 1 each year, covering the previous calendar year. The system can provide a copy on request.
Other water systems in Ulster County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Kingston (City) Water District | Ulster | 24,000 | Community | Surface water |
| New Paltz (Village) Water Dist | Ulster | 7,523 | Community | Surface water |
| Ulster Water District | Ulster | 5,500 | Community | Purchased surface water |
| Port Ewen Water District | Ulster | 4,500 | Community | Surface water |
| Ellenville (Village) Water Dis | Ulster | 4,300 | Community | Groundwater |
| Saugerties (Village) Water Dis | Ulster | 4,200 | 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, “Lake Mohonk Mountain House, PWSID NY5519179, New York”, https://aquacensus.com/water-systems/new-york/lake-mohonk-mountain-house-ny5519179 (data as of October 1, 2026).