Public water system · NY3920083
Active551 Route 6, Mahopac
At a glance
551 Route 6, Mahopac (PWSID NY3920083) is an active transient non-community water system in Putnam County, New York. It reports serving 50 people through 5 service connections. Its primary water source is groundwater, 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 July 2003.
Dataset updated . Source: EPA SDWIS/ECHO public records.
Population served
50
Service connections
5
Primary source
GW
Groundwater
System type
TNCWS
Transient non-community water system
System record
How does 551 Route 6, Mahopac compare with other water systems in Putnam County?
By EPA's size categories, 551 Route 6, Mahopac is a very small system (500 people or fewer). Putnam County has 382 active public water systems. Its population served is about 67% below the county average of 150 people per system, and accounts for less than 0.1% of the 57,156 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 transient non-community water system reports serving 144 people, so 551 Route 6, Mahopac is about 65% below that figure.
What does “transient non-community water system” mean?
A transient non-community water system serves places where people do not stay long, such as gas stations and campgrounds, and regularly serves at least 25 people a day for at least 60 days a year. New York has 5,182 active transient non-community water systems, 63% of the state's 8,167 active systems. Groundwater means the system draws its water from wells or springs fed by underground aquifers. 7,096 New York systems (87%) list groundwater as their primary source.
Who owns and regulates 551 Route 6, Mahopac?
EPA lists 551 Route 6, Mahopac 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. 342 of the 382 active systems in Putnam County (90%) are also privately owned.
Does 551 Route 6, Mahopac have drinking water violations?
Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in July 2003. The violations listed here began between July 2003 and July 2003. By type: 12 monitoring and reporting. The contaminants or rules involved are Carbon tetrachloride, 1,1,1-Trichloroethane, Vinyl chloride and p-Dichlorobenzene. EPA lists 12 as archived. 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 |
|---|---|---|---|---|
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Carbon tetrachloridecode 2982 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1,1-Trichloroethanecode 2981 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Vinyl chloridecode 2976 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | p-Dichlorobenzenecode 2969 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Styrenecode 2996 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | trans-1,2-Dichloroethylenecode 2979 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,1-Dichloroethylenecode 2977 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Trichloroethylenecode 2984 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Ethylbenzenecode 2992 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | 1,2,4-Trichlorobenzenecode 2378 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | cis-1,2-Dichloroethylenecode 2380 | No | Archived |
| 2003-07-01 | Monitoring and reportingMonitoring, Regular · code 03 | Toluenecode 2991 | No | Archived |
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.
551 Route 6, Mahopac: frequently asked questions
Who runs 551 Route 6, Mahopac?
551 Route 6, Mahopac (PWSID NY3920083) is a transient non-community water system privately owned. It is regulated by the NY state drinking water program.
How many people does 551 Route 6, Mahopac serve?
551 Route 6, Mahopac reports serving 50 people through 5 service connections in Putnam County, New York.
Where does 551 Route 6, Mahopac 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 551 Route 6, Mahopac 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 July 2003. 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 551 Route 6, Mahopac'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 July 2003. For current results, consult EPA ECHO, or the NY state drinking water program.
Where can I find 551 Route 6, Mahopac's water quality report?
The annual Consumer Confidence Report requirement applies to community water systems. 551 Route 6, Mahopac is a 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 Putnam County
| Water system | County | Population served | Type | Source |
|---|---|---|---|---|
| Carmel Wd 2 | Putnam | 5,000 | Community | Surface water |
| Mahopac School Complex (Falls, Mms, Mhs) | Putnam | 3,200 | Non-transient non-community | Groundwater |
| Cold Spring Village | Putnam | 2,666 | Community | Surface water |
| Brewster Village | Putnam | 2,162 | Community | Groundwater |
| Continental Village Wd | Putnam | 1,509 | Community | Purchased surface water |
| Mount Ebo Ws | Putnam | 1,500 | 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, “551 Route 6, Mahopac, PWSID NY3920083, New York”, https://aquacensus.com/water-systems/new-york/551-route-6-mahopac-ny3920083 (data as of October 1, 2026).