Public water system · NY4430194

Active

Atlantic Testing Laboratories Ltd

At a glance

Atlantic Testing Laboratories Ltd (PWSID NY4430194) is an active non-transient non-community water system in St. Lawrence County, New York. It reports serving 34 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, none is health-based, and the most recent began in January 2022.

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

PWSIDNY4430194

System typeNon-transient non-community water system

Activity statusActive

Population served34

Service connections1

Primary water sourceGroundwater

Owner typePrivate

Primacy agencyNY state drinking water program

City servedPotsdam (T)

StateNew York

ZIP—

CountySt. Lawrence County

How does Atlantic Testing Laboratories Ltd compare with other water systems in St. Lawrence County?

By EPA's size categories, Atlantic Testing Laboratories Ltd is a very small system (500 people or fewer). St. Lawrence County has 229 active public water systems. Its population served is well below the county average of 354 people per system, and accounts for less than 0.1% of the 81,125 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 non-transient non-community water system reports serving 430 people, so Atlantic Testing Laboratories Ltd 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. New York has 704 active non-transient non-community water systems, 8.6% 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 Atlantic Testing Laboratories Ltd?

EPA lists Atlantic Testing Laboratories Ltd 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. 183 of the 229 active systems in St. Lawrence County (80%) are also privately owned.

Does Atlantic Testing Laboratories Ltd have drinking water violations?

Of the 12 most recent violations in EPA's records, none is health-based, and the most recent began in January 2022. The violations listed here began between January 2015 and January 2022. By type: 7 monitoring and 5 monitoring and reporting. The contaminant or rule involved most often is Revised Total Coliform Rule (7 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
2022-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2019-07-01	MonitoringMonitoring, Additional Routine (RTCR) · code 3B	Revised Total Coliform Rulecode 8000	No	Resolved
2019-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2018-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2018-01-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-10-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-07-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-04-01	MonitoringMonitoring, Routine (RTCR) · code 3A	Revised Total Coliform Rulecode 8000	No	Resolved
2017-01-01	Monitoring and reportingMonitoring, Regular · code 03	Nitratecode 1040	No	Resolved
2016-01-01	Monitoring and reportingMonitoring, Routine Major (TCR) · code 23	Total coliform bacteria (TCR)code 3100	No	Resolved
2015-01-01	Monitoring and reportingMonitoring, Regular · code 03	Chromiumcode 1020	No	Resolved
2015-01-01	Monitoring and reportingMonitoring, Regular · code 03	Cadmiumcode 1015	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.

Atlantic Testing Laboratories Ltd: frequently asked questions

Who runs Atlantic Testing Laboratories Ltd?

Atlantic Testing Laboratories Ltd (PWSID NY4430194) is a non-transient non-community water system privately owned. It is regulated by the NY state drinking water program.

How many people does Atlantic Testing Laboratories Ltd serve?

Atlantic Testing Laboratories Ltd reports serving 34 people through 1 service connection in St. Lawrence County, New York.

Where does Atlantic Testing Laboratories Ltd 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 Atlantic Testing Laboratories Ltd 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 January 2022. 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 Atlantic Testing Laboratories Ltd'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 January 2022. For current results, consult EPA ECHO, or the NY state drinking water program.

Where can I find Atlantic Testing Laboratories Ltd's water quality report?

The annual Consumer Confidence Report requirement applies to community water systems. Atlantic Testing Laboratories Ltd 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 St. Lawrence County

Water system	County	Population served	Type	Source
Massena Village	St. Lawrence	16,729	Community	Surface water
Ogdensburg City	St. Lawrence	10,064	Community	Surface water
Potsdam Village	St. Lawrence	8,312	Community	Surface water
Canton Village	St. Lawrence	7,055	Community	Groundwater
Gouverneur	St. Lawrence	4,263	Community	Surface water
East Louisville Water District	St. Lawrence	3,235	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, “Atlantic Testing Laboratories Ltd, PWSID NY4430194, New York”, https://aquacensus.com/water-systems/new-york/atlantic-testing-laboratories-ltd-ny4430194 (data as of October 1, 2026).